Form 10-Q - Quarterly report [Sections 13 or 15(d)]

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2024

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-38191

MUSTANG BIO, INC.

(Exact name of registrant as specified in its charter)

Delaware		47-3828760
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

377 Plantation Street

Worcester, MA 01605

(Address including zip code of principal executive offices)

(781) 652-4500

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	MBIO	Nasdaq Capital Market

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act:

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

Class of Common Stock		Outstanding Shares as of November 7, 2024
Class A Common Stock, $0.0001 par value		845,385
Common Stock, $0.0001 par value		46,934,863

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MUSTANG BIO, INC.

QUARTERLY REPORT ON FORM 10-Q

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PART I. FINANCIAL INFORMATION		5

Item 1.	Unaudited Financial Statements	5

Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	24

Item 3.	Quantitative and Qualitative Disclosures About Market Risks	39

Item 4.	Controls and Procedures	39

PART II. OTHER INFORMATION		39

Item 1.	Legal Proceedings	39

Item 1A	Risk Factors	40

Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	78

Item 3.	Defaults Upon Senior Securities	78

Item 4.	Mine Safety Disclosures	78

Item 5.	Other Information	78

Item 6.	Exhibits	79

Signatures		80

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SUMMARY OF RISK FACTORS

Our business is subject to risks of which you should be aware before making an investment decision in our securities. The risks described below are a summary of the principal risks associated with an investment in us and are not the only risks we face. You should carefully consider these risk factors, the risk factors described in Item 1A of this Quarterly Report on Form 10-Q (this “Form 10-Q”), and the other reports and documents that we have filed with the Securities and Exchange Commission.

Risks Related to our Finances and Capital Requirements

●

We have incurred significant losses since our inception and anticipate that we will incur continued losses for the foreseeable future.

●

There is substantial doubt regarding our ability to continue as a going concern. We will need to raise additional financing in upcoming periods, which may not be available on acceptable terms to us, or at all. Failure to obtain necessary capital when needed may force us to delay, limit or terminate our potential product candidates.

●

We have not generated any revenue from our development stage products, and we do not know when, or if, we will generate any revenue.

●

Our short operating history makes it difficult to evaluate our business and prospects.

●

Our success is contingent on raising additional capital, and our efforts to do so may fail. Even if successful, our future capital raising activities may dilute our current stockholders, restrict our operations, or cause us to relinquish proprietary rights.

Risks Pertaining to our Business Strategy, Structure and Organization

●

Our future growth and success depend on our ability to successfully develop, and, if approved, commercialize our product candidates, which we have yet to do.

●

Our future success is highly dependent on the successful development of our chimeric antigen receptor (“CAR”) engineered T cell (“CAR T”) technology and oncolytic virus product candidates.

●

Our strategic pivot for our lead product candidate, MB-106, and our disposal of non-core assets, including our facility, may not result in the cost savings we anticipate and could result in total costs and expenses that are greater than expected.

Risks Inherent in Drug Development and Commercialization

●

Preclinical development is highly speculative and carries a high failure risk.

●

We may not receive the required regulatory approvals for any of our product candidates on our projected timelines, if at all, which may result in increased costs and delay our ability to generate revenue.

●

We may not obtain the desired labeling claims or intended uses for product promotion, or favorable scheduling classifications, to successfully promote our product candidates, if approved.

●

If a product candidate demonstrates adverse side effects, we may need to abandon or limit the development of such product candidate.

●

Even if a product candidate is approved, it may be subject to various post-marketing requirements, including studies or clinical trials, and increased regulatory scrutiny.

●

Our competitors may develop treatments for our products’ target indications, which could limit our product candidates’ commercial opportunity and profitability.

●

If our product candidates, if approved, are not broadly accepted by the healthcare community, the revenues from any such product will likely be limited.

●

Any successful products’ liability claims related to any of our current or future product candidates may cause us to incur substantial liability and limit the commercialization of any such products.

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Risks Related to Reliance on Third Parties

●

We rely, and expect to continue to rely, on third parties to conduct our preclinical studies and clinical trials, and those third parties may not perform satisfactorily, including failing to meet deadlines for the completion of such trials or complying with applicable regulatory requirements.

●

We rely on clinical data and results obtained by third parties, which may prove inaccurate or unreliable.

●

We may need to license certain intellectual property from third parties, and such licenses may not be available or may not be available on commercially reasonable terms.

Risks Relating to Legislation and Regulation Affecting the Biopharmaceutical and Other Industries

●

We operate in a heavily regulated industry, and we cannot predict the impact that any future legislation or administrative or executive action may have on our operations.

●

We may be subject to anti-kickback, fraud and abuse, false claims, transparency, health information privacy and security and other healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm, administrative burdens and diminished profits and future earnings.

●

We are subject to numerous environmental, health and safety laws and regulations and could become subject to fines or penalties or incur costs that could harm our business.

Risks Pertaining to Intellectual Property and Potential Disputes with Licensors Thereof

●

If we are unable to obtain and maintain sufficient patent protection for our technology and products, our competitors could develop and commercialize products similar or identical to ours and our ability to successfully commercialize our technology and products could therefore be impaired.

●

We depend on our licensors to maintain and enforce the intellectual property rights covering certain of our product candidates.

●

We or our licensors may be subject to costly and time-consuming litigation for infringement of third-party intellectual property rights or to enforce our or our licensors’ intellectual property rights against third-party infringers.

●

Any dispute with our licensors may affect our ability to develop or commercialize our product candidates.

Risks Relating to Our Control by Fortress Biotech, Inc. (“Fortress”)

●

Fortress controls a voting majority of our common stock and has the right to receive significant share grants annually, which will result in dilution of our other stockholders and could reduce the value of our common stock.

●

We have entered into certain agreements with Fortress and may have received better terms from unaffiliated third parties.

●

We share certain directors with Fortress, which could create conflicts of interest between us and Fortress.

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PART I. FINANCIAL INFORMATION

Item 1. Unaudited Financial Statements

MUSTANG BIO, INC.

Balance Sheets (Unaudited)

(in thousands, except share and per share amounts)


	September 30,		December 31,
	2024		2023

ASSETS
Current Assets:
Cash and cash equivalents	$	3,525	$	6,234
Other receivables		237		3,879
Prepaid expenses and other current assets		84		1,233
Property, plant and equipment, held for sale		2,209		—
Total current assets		6,055		11,346

Property, plant and equipment, net		421		3,247
Restricted cash		375		750
Other assets		250		833
Operating lease right-of-use asset, net		92		1,566
Total Assets	$	7,193	$	17,742

LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities:
Accounts payable and accrued expenses	$	12,061	$	14,017
Payables and accrued expenses - related party		2,535		834
Operating lease liabilities - short-term		442		520
Total current liabilities		15,038		15,371

Deferred income		270		270
Operating lease liabilities - long-term		541		1,978
Total Liabilities		15,849		17,619

Commitments and Contingencies (Note 12)

Stockholders’ Equity
Preferred stock ($0.0001 par value), 2,000,000 shares authorized, 250,000 shares of Class A preferred stock issued and outstanding as of September 30, 2024 and December 31, 2023, respectively		—		—
Common stock ($0.0001 par value), 200,000,000 shares authorized as of September 30, 2024 and December 31, 2023, respectively
Class A common shares, 845,385 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively		—		—
Common shares, 36,827,671, and 8,374,869 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively		3		1
Common stock issuable, zero and 419,089 shares as of September 30, 2024 and December 31, 2023, respectively		—		591
Additional paid-in capital		387,112		380,502
Accumulated deficit		(395,771)		(380,971)
Total Stockholders’ Equity		(8,656)		123
Total Liabilities and Stockholders’ Equity	$	7,193	$	17,742

The accompanying notes are an integral part of these unaudited financial statements.

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MUSTANG BIO, INC.

Statements of Operations (Unaudited)

(in thousands, except share and per share amounts)


	For the three months ended September 30,				For the nine months ended September 30,
	2024		2023		2024		2023
Operating expenses:
Research and development	$	57	$	9,527	$	8,221	$	34,363
Asset impairment		—		—		2,649		—
Gain on the sale of property and equipment		—		(1,351)		—		(1,351)
General and administrative		1,400		2,131		4,358		7,507
Total operating expenses		1,457		10,307		15,228		40,519
Loss from operations		(1,457)		(10,307)		(15,228)		(40,519)

Other income (expense)
Other income		—		138		314		918
Interest income		48		115		118		727
Interest expense		(1)		(4)		(4)		(4,112)
Total other income (expense)		47		249		428		(2,467)
Net Loss	$	(1,410)	$	(10,058)	$	(14,800)	$	(42,986)

Net loss per common share outstanding, basic and diluted	$	(0.04)	$	(1.23)	$	(0.62)	$	(5.29)

Weighted average number of common shares outstanding, basic and diluted		36,840,427		8,171,582		23,786,939		8,131,191

The accompanying notes are an integral part of these unaudited financial statements.

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MUSTANG BIO, INC.

Statements of Stockholders’ Equity (Unaudited)

(in thousands, except share amounts)


	For the Three Months Ended September 30, 2024
										Common		Additional				Total
	Class A Preferred Stock			Class A Common Shares			Common Shares			Stock		Paid-in		Accumulated		Stockholders'
	Shares	Amount		Shares	Amount		Shares	Amount		Issuable		Capital		Deficit		Equity
Balances at June 30, 2024	250,000	$	—	845,385	$	—	34,098,059	$	3	$	—	$	386,028	$	(394,361)	$	(8,330)
Issuance of common shares - Founders Agreement	—		—	—		—	66,549		—		—		29		—		29
Issuance of common shares, net of offering costs - At-the-Market Offering	—		—	—		—	2,661,943		—		—		1,118		—		1,118
Offering costs - Equity Offerings	—		—	—		—	—		—		—		(105)		—		(105)
Stock-based compensation expenses	—		—	—		—	1,120		—		—		42		—		42
Exercise of warrants	—		—	—		—	—		—		—		—		—		—
Net loss	—		—	—		—	—		—		—		—		(1,410)		(1,410)
Balances at September 30, 2024	250,000	$	—	845,385	$	—	36,827,671	$	3	$	—	$	387,112	$	(395,771)	$	(8,656)


	For the Nine Months Ended September 30, 2024
										Common		Additional				Total
	Class A Preferred Stock			Class A Common Shares			Common Shares			Stock		Paid-in		Accumulated		Stockholders'
	Shares	Amount		Shares	Amount		Shares	Amount		Issuable		Capital		Deficit		Equity
Balances at December 31, 2023	250,000	$	—	845,385	$	—	8,374,869	$	1	$	591	$	380,502	$	(380,971)	$	123
Issuance of common shares - Founders Agreement	—		—	—		—	994,826		—		(477)		669		—		192
Issuance of common shares, equity fee on At-the-Market Offering	—		—	—		—	66,003		—		(114)		114		—		—
Issuance of common shares, net of offering costs - Equity Offerings	—		—	—		—	4,185,000		—		—		5,160		—		5,160
Issuance of common shares, net of offering costs - At-the-Market Offering	—		—	—		—	2,661,943		—		—		1,118		—		1,118
Issuance of common shares under ESPP	—		—	—		—	47,463		—		—		48		—		48
Stock-based compensation expenses	—		—	—		—	6,693		—		—		(500)		—		(500)
Exercise of warrants	—		—	—		—	20,490,874		2		—		1		—		3
Net loss	—		—	—		—	—		—		—		—		(14,800)		(14,800)
Balances at September 30, 2024	250,000	$	—	845,385	$	—	36,827,671	$	3	$	—	$	387,112	$	(395,771)	$	(8,656)

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MUSTANG BIO, INC.

Statements of Stockholders’ Equity (Unaudited)

(in thousands, except share amounts)


	For the Three Months Ended September 30, 2023
										Common		Additional				Total
	Class A Preferred Stock			Class A Common Shares			Common Shares			Stock		Paid-in		Accumulated		Stockholders'
	Shares	Amount		Shares	Amount		Shares	Amount		Issuable		Capital		Deficit		Equity
Balances at June 30, 2023	250,000	$	—	845,385	$	—	7,320,444	$	1	$	—	$	376,009	$	(362,297)	$	13,713
Issuance of common shares, net of offering shares -At-the-Market Offering	—		—	—		—	51,880		—		—		160		—		160
Issuance of common shares - Equity fee on At-the-Market Offering	—		—	—		—	—		—		4		—		—		4
Issuance of common shares under ESPP	—		—	—		—	34,869		—		—		90		—		90
Stock-based compensation expenses	—		—	—		—	43,822		—		—		100		—		100
Net loss	—		—	—		—	—		—		—		—		(10,058)		(10,058)
Balances at September 30, 2023	250,000	$	—	845,385	$	—	7,451,015	$	1	$	4	$	376,359	$	(372,355)	$	4,009


	For the Nine Months Ended September 30, 2023
										Common		Additional				Total
	Class A Preferred Stock			Class A Common Shares			Common Shares			Stock		Paid-in		Accumulated		Stockholders'
	Shares	Amount		Shares	Amount		Shares	Amount		Issuable		Capital		Deficit		Equity
Balances at December 31, 2022	250,000	$	—	845,385	$	—	7,100,111	$	11	$	1,109	$	374,522	$	(329,369)	$	46,273
Issuance of common shares - Founders Agreement	—		—	—		—	187,134		—		(1,109)		1,109		—		—
Issuance of common shares, net of offering shares -At-the-Market Offering	—		—	—		—	51,880		—		—		160		—		160
Issuance of common shares - Equity fee on At-the-Market Offering	—		—	—		—	—		—		4		—		—		4
Issuance of common shares under ESPP	—		—	—		—	47,511		—		—		178		—		178
Stock-based compensation expenses	—		—	—		—	65,919		—		—		380		—		380
Exercise of warrants	—		—	—		—	93		—		—		—		—		—
Reverse Split (15:1) adjustment	—		—	—		—	—		(10)		—		10		—		—
Fractional share adjustment	—		—	—		—	(1,633)		—		—		—		—		—
Net loss	—		—	—		—	—		—		—		—		(42,986)		(42,986)
Balances at September 30, 2023	250,000	$	—	845,385	$	—	7,451,015	$	1	$	4	$	376,359	$	(372,355)	$	4,009

The accompanying notes are an integral part of these unaudited financial statements.

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MUSTANG BIO, INC.

Statements of Cash Flows (Unaudited)

(in thousands)


	For the nine months ended September 30,
	2024		2023
Cash Flows from Operating Activities:
Net loss	$	(14,800)	$	(42,986)
Adjustments to reconcile net loss to net cash used in operating activities:
Issuance of common shares - Equity fee on Equity Offerings to Fortress Biotech		192		—
Common shares issuable - Equity fee on at-the-market offering to Fortress Biotech		—		4
Research and development - licenses acquired		—		50
Stock-based compensation expenses		(500)		380
Depreciation expense		620		1,576
Amortization of debt discount		—		118
Amortization of operating lease right-of-use assets		128		286
Loss on disposal of property and equipment		29		—
Asset impairment		2,649		—
Gain on sale of property and equipment		—		(1,351)
Loss on extinguishment of debt		—		2,796
Gain on lease modification		(314)		(220)
Changes in operating assets and liabilities:
Prepaid expenses and other assets		702		(1,688)
Other receivables		659		—
Other receivables - related party		—		36
Accounts payable and accrued expenses		(150)		(1,299)
Payable and accrued expenses - related party		1,701		239
Lease liabilities		(329)		(163)
Net cash used in operating activities		(9,413)		(42,223)

Cash Flows from Investing Activities:
Purchase of research and development licenses		—		(50)
Proceeds from the sale of property and equipment		—		6,000
Purchase of fixed assets		—		(34)
Net cash from investing activities		—		5,916

Cash Flows from Financing Activities:
Payment of debt		—		(30,375)
Proceeds from issuance of common shares - Equity Offerings		5,944		163
Offering costs for the issuance of common shares - Equity Offerings		(784)		(3)
Proceeds from issuance of common shares - At-the-Market Offering		1,163		—
Offering costs for the issuance of common shares - At-the-Market Offering		(45)		—
Proceeds from exercise of warrants		3		—
Proceeds from issuance of common shares under ESPP		48		178
Net cash provided by financing activities		6,329		(30,037)

Net change in cash, cash equivalents and restricted cash		(3,084)		(66,344)
Cash, cash equivalents and restricted cash, beginning of the period		6,984		76,656
Cash, cash equivalents and restricted cash, end of the period	$	3,900	$	10,312

Supplemental disclosure of cash flow information:
Cash paid for interest	$	—	$	1,340

Supplemental disclosure of noncash activities:
Issuance of common shares - Founders Agreement and Equity fee to Fortress	$	591	$	1,109

Supplemental disclosure of noncash activities related to the uBriGene Repurchase Transaction (see Note 5):
Fair value of assets received	$	2,209	$	—
Fair value of supplies received expensed to research and development	$	2,509	$	—
Accounts receivable written off	$	(6,967)	$	—
Accounts payable written off	$	3,644	$	—
Deferred purchase consideration	$	(1,295)	$	—

The accompanying notes are an integral part of these unaudited financial statements

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MUSTANG BIO, INC.

Notes to Unaudited Financial Statements

Note 1 - Organization, Description of Business and Liquidity and Capital Resources

Mustang Bio, Inc. (the “Company” or “Mustang”) was incorporated in Delaware on March 13, 2015. Mustang is a clinical-stage biopharmaceutical company focused on translating medical breakthroughs in cell therapy into potential treatments. The Company may acquire rights to these technologies by licensing the rights or otherwise acquiring an ownership interest in the technologies, funding their research and development and eventually either out-licensing or bringing the technologies to market.

The Company is a majority-controlled subsidiary of Fortress Biotech, Inc. (“Fortress” or “Parent”).

Liquidity and Capital Resources

The Company has incurred substantial operating losses and expects to continue to incur significant operating losses for the foreseeable future and may never become profitable. As of September 30, 2024, the Company had an accumulated deficit of $395.8 million.

The Company has funded its operations to date primarily through the sale of equity. The Company expects to continue to use the proceeds from its previous financing transactions and asset sale primarily for working capital and general corporate purposes.

The Company will require substantial additional financings through equity and debt offerings, collaborations and licensing arrangements or other sources to fully develop, prepare regulatory filings, obtain regulatory approvals and commercialize its existing product candidates. The continuation of our business as a going concern is dependent upon raising additional capital and eventually attaining and maintaining profitable operations.

In accordance with Accounting Standards Codification (“ASC”) 205-40, Going Concern, the Company evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about its ability to continue as a going concern within one year after the date that these unaudited consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans that have not been fully implemented as of the date the financial statements are issued. When substantial doubt exists under this methodology, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that these unaudited financial statements are issued. In performing its evaluation, management excluded certain elements of its operating plan that cannot be considered probable. Under ASC 205-40, the future receipt of potential funding from future equity or debt issuances cannot be considered probable at this time because these plans are not entirely within the Company’s control nor have been approved by the Board of Directors as of the date of these financial statements.

The Company's expectation to generate operating losses and negative operating cash flows in the future, and the need for additional funding to support its planned operations raise substantial doubt regarding the Company’s ability to continue as a going concern for a period of one year after the date that these unaudited financial statements are issued. The Company made strategic decisions, including a significant reduction in the workforce by approximately 81%, and the termination of certain license agreements with St. Jude and Leiden University Medical Centre in April 2024, and with Mayo Clinic in June 2024, to preserve capital and prioritize the allocation of resources. The Company continues to pursue raising additional cash resources through public or private equity or debt financings. The Company has concluded that substantial doubt exists about the Company’s ability to continue as a going concern for a period of at least 12 months from the date of issuance of these unaudited financial statements.

The accompanying unaudited financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business. The financial statements do not include

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any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that may be necessary if the Company is unable to continue as a going concern.

Note 2 - Significant Accounting Policies

Basis of Presentation

The accompanying interim unaudited financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the interim unaudited financial statements reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the balances and results for the periods presented. They do not include all of the information and footnotes required by GAAP for complete financial statements. Therefore, these financial statements should be read in conjunction with the Company's audited financial statements and notes thereto for the year ended December 31, 2023, which were included in the Company’s Annual Report on Form 10-K and filed with the Securities and Exchange Commission (“SEC”) on March 11, 2024 (the “2023 Form 10-K”). The results of operations for any interim periods are not necessarily indicative of the results that may be expected for the entire fiscal year or any other interim period.

Use of Estimates

The Company’s unaudited financial statements include certain amounts that are based on management’s best estimates and judgments. The Company’s significant estimates include, but are not limited to, assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Due to the uncertainty inherent in such estimates, actual results could differ from those estimates.

Cash, Cash Equivalents and Restricted Cash

The Company records cash held in an escrow account as a security deposit for the manufacturing facility in Worcester, Massachusetts, as restricted cash.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash from the Unaudited Balance Sheets to the Unaudited Statements of Cash Flows for the nine months ended September 30, 2024, and 2023:


	September 30,
($ in thousands)	2024	2023
Cash and cash equivalents	$ 3,525	$ 9,562
Restricted cash	375	750
Total cash, cash equivalents and restricted cash	$ 3,900	$ 10,312

Assets Held for Sale

Assets held for sale represent assets that have met the criteria of “held for sale” accounting, as specified by Accounting Standards Codification (“ASC”) 360, “Long-lived Assets.” As of September 30, 2024, there were $2.2 million of lab and cell processing equipment, furniture and fixtures and computer equipment that are recorded as assets held for sale. The effect of suspending depreciation on the assets held for sale is immaterial to the results of operations. The assets held for sale were part of the repurchase of assets from uBriGene (see Note 5).

Impairment of Long-Lived Assets

The Company reviews long-lived assets, including tangible assets and other intangible assets with definitive lives, for impairment whenever events or changes in circumstances indicate that the asset’s carrying amount may not be recoverable. The Company conducts its long-lived asset impairment analyses in accordance with ASC 360-10, "Impairment or Disposal

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of Long-Lived Assets. ASC 360-10-15 requires the Company to group assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities and evaluate the asset group against the sum of the undiscounted future cash flows. If the undiscounted cash flows do not indicate the carrying amount of the asset group is recoverable, an impairment charge is measured as the amount by which the carrying amount of the asset group exceeds its fair value based on discounted cash flow analysis or appraisals.

Significant Accounting Policies

There have been no material changes to the Company’s significant accounting policies previously disclosed in the 2023 Form 10-K.

Recently Issued Accounting Standards

As of September 30, 2024, there were no new accounting pronouncements or updates to recently issued accounting pronouncements disclosed in the 2023 Form 10-K that affect the Company’s present or future results of operations, overall financial condition, liquidity, or disclosures upon adoption.

Note 3 - Clinical Trial and Sponsored Research Agreements

Research and Development Expenses – Clinical Trial and Sponsored Research Agreements

For the three and nine months ended September 30, 2024 and 2023, the Company recorded the following expenses in research and development for sponsored research and clinical trial agreements in the Unaudited Statements of Operations pursuant to the terms of these agreements:


	For the three months ended September 30,				For the nine months ended September 30,
($ in thousands)	2024		2023		2024		2023
City of Hope National Medical Center
CD123	$	—	$	23	$	—	$	23
IL13Rα2		66		180		457		817
CS1⁽¹⁾		—		—		—		188
PSCA⁽¹⁾		—		—		—		44
Fred Hutchinson Cancer Center - CD20		—		142		312		1,239
St. Jude Children's Research Hospital - XSCID⁽²⁾		—		(106)		(434)		528
Leiden University Medical Center - RAG1 SCID		—		125		241		349
Mayo Clinic⁽³⁾		—		—		(275)		551
Total	$	66	$	364	$	301	$	3,739

⁽¹⁾ Licenses and associated sponsored research agreements were terminated in May 2023.

⁽²⁾ License and associated Data Transfer Agreement were terminated in April 2024.

⁽³⁾ License and associated sponsored research agreement were terminated in June 2024.

Ongoing Clinical Trial and Sponsored Research Agreements

IL13Rα2 (MB-101) Clinical Research Support Agreements with City of Hope

Since February 2017, the Company has been party to a clinical research support agreement for the IL13Rα2-directed CAR T program (the “IL13Rα2 CRA”) with COH, whereby, the Company has agreed to contribute $0.1 million related to patient costs in connection with the on-going investigator-initiated study.

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Since October 2020, the Company has been party to a clinical research support agreement for the IL13Rα2-directed CAR T program for adult patients with leptomeningeal glioblastoma, ependymoma or medulloblastoma (the “IL13Rα2 Leptomeningeal CRA”) with COH, whereby the Company has agreed to contribute $0.1 million per patient in connection with the ongoing investigator-initiated study. Further, the Company agreed to fund approximately $0.2 million annually pertaining to the clinical development of the IL13Rα2-directed CAR T program for this patient population.

Since October 2020, the Company has been party to a Sponsored Research Agreement (“SRA”) with COH to conduct combination studies of a potential IL13Rα2 CAR (MB-101) and herpes simplex-1 oncolytic virus therapy (MB-108). Pursuant to the SRA, the Company funded research in the amount of $0.3 million for the program. In November 2022, the SRA was amended to include additional funding of $0.6 million.

CD20 (MB-106) Clinical Trial Agreement with Fred Hutchinson Cancer Center

Since July 3, 2017, in conjunction with the CD20 Technology License from Fred Hutchinson Cancer Center (“Fred Hutch”), the Company has been party to an investigator-initiated clinical trial agreement (the “CD20 CTA”) to provide partial funding for a Phase 1/2 clinical trial at Fred Hutch evaluating the safety and efficacy of the CD20 Technology in patients with relapsed or refractory B-cell non-Hodgkin lymphomas. In connection with the CD20 CTA, the Company agreed to fund up to $5.3 million of costs associated with the clinical trial, which commenced during the fourth quarter of 2017. In November 2020, the CD20 CTA was amended to include additional funding of approximately $1.8 million, which includes $0.8 million for the treatment of five patients with chronic lymphocytic leukemia. In January 2022, the CD20 CTA was amended to include additional funding of $2.2 million increasing the total payment obligation of the Company in connection with the CD20 CTA not to exceed $9.3 million.

Terminated Clinical Trial and Sponsored Research Agreements

In May 2023, the Company determined to discontinue development of certain programs, including CS1 (MB-104) and PSCA (MB-105), and terminated the associated CRA and license with COH. In April 2024, the Company terminated its license agreement and the associated Data Transfer Agreement with St. Jude, in exchange for a mutual release of liability and forgiveness by St. Jude of all amounts previously owed by the Company, which totaled approximately $0.6 million. Additionally, in April 2024, the Company delivered a termination notice to LUMC, pursuant to which it terminated the license agreement underpinning the MB-110 product candidate; the Company is currently in discussions with LUMC regarding the terms that will govern such termination In June 2024, the Company terminated its license agreement and associated SRA with the Mayo Clinic, in exchange for a mutual release of liability and forgiveness by Mayo Clinic of all amounts previously owed by the Company, which totaled approximately $0.3 million. The forgiven amounts, totaling approximately $0.9 million, were recognized as a reduction of research and development expense in the Unaudited Statements of Operations.

Note 4 - Related Party Agreements

Founders Agreement and Management Services Agreement with Fortress

With respect to the Company’s Management Services Agreement (the “Management Services Agreement”) with Fortress for the three and nine months ended September 30, 2024 and 2023, expenses related to the MSA are recorded 50% in research and development expenses and 50% in general and administrative expenses in the Unaudited Statements of Operations. For the three months ended September 30, 2024 and 2023, the Company recorded expense of $0.1 million and $0.1 million, respectively, related to the MSA. For the nine months ended September 30, 2024 and 2023, the Company recorded expense of $0.4 million and $0.4 million, respectively.

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general and administrative expenses related to these shares. For the nine months ended September 30, 2024 and 2023, the Company recorded expense of approximately $0.2 million and $4,000, respectively, in general and administrative expenses related to these shares.

Annual Stock Dividend

Pursuant to the Company’s Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), the Company issued 353,086 shares of common stock to Fortress as the Annual Stock Dividend (as such term is defined in the Certificate of Incorporation), representing 2.5% of the fully-diluted outstanding equity of Mustang on January 2, 2024. This was recorded in the Statement of Stockholders’ Equity at December 31, 2023, as Common stock issuable – Founders Agreement. The Company recorded an expense of approximately $0.5 million in research and development – licenses acquired related to these issuable shares during the year ended December 31, 2023.

Payables and Accrued Expenses Related Party

In the normal course of business Fortress pays for certain expenses on behalf of the Company. Such expenses are recorded as payables and accrued expenses - related party.

Note 5 – Assets Purchase Agreements

Agreements with uBriGene

On May 18, 2023, the Company entered into an Asset Purchase Agreement (the “Original Asset Purchase Agreement”) with uBriGene (Boston) Biosciences, Inc., a Delaware corporation (“uBriGene”), pursuant to which the Company agreed to sell its leasehold interest in its cell processing facility located in Worcester, Massachusetts (the “Facility”), and associated assets relating to the manufacturing and production of cell and gene therapies at the Facility to uBriGene (the “Transaction”). The Company and uBriGene subsequently entered into Amendment No. 1 to the Original Asset Purchase Agreement, dated as of June 29, 2023 (“Amendment No. 1”), and Amendment No. 2 to the Original Asset Purchase Agreement, dated as of July 28, 2023 (“Amendment No. 2,” and together with the Original Asset Purchase Agreement and Amendment No. 1, the “Prior Asset Purchase Agreement”).

On July 28, 2023, pursuant to the Prior Asset Purchase Agreement, the Company completed the sale of all of its assets that primarily relate to the manufacturing and production of cell and gene therapies at the Facility (such operations, the “Transferred Operations” and such assets, the “Transferred Assets”) to uBriGene for upfront consideration of $6 million cash (the “Base Amount”). The Transferred Assets included all of the Company’s assets, except for the Company’s lease and related leasehold improvements of the Facility and contracts that are primarily used in the Transferred Operations. The Company recorded a gain of $1.4 million in connection with the sale of the Transferred Assets, and recorded approximately $0.3 million of the base consideration as deferred income, that was to be recognized upon the transfer of the lease.

In connection with the Prior Asset Purchase Agreement, the Company and uBriGene submitted a voluntary joint notice to the U.S. Committee on Foreign Investment in the United States (“CFIUS”). Following CFIUS’s review and subsequent investigation of the transactions related to the Prior Asset Purchase Agreement, on May 13, 2024, the Company, together with uBriGene and CFIUS, executed a National Security Agreement (the “NSA”), pursuant to which the Company and uBriGene agreed to abandon the transactions related to the Prior Asset Purchase Agreement and the agreements entered into in connection therewith. The NSA obligated uBriGene and the Company to terminate agreements between the two parties, including the Manufacturing Services Agreement, Quality Services Agreement, and Subcontracting CDMO Agreement. In addition, uBriGene must sell, or otherwise dispose of, the equipment assets purchased within 180 days after the execution of the NSA.

June 2024 Repurchase of Assets

On June 27, 2024 (the “Effective Date”), the Company entered into an Asset Purchase Agreement (the “Repurchase Agreement”) with uBriGene, pursuant to which the Company agreed, subject to the terms and conditions set forth therein,

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to repurchase the Transferred Assets, primarily lab equipment and supplies, (collectively, the “Repurchased Assets”). Pursuant to the terms of the Repurchase Agreement, the Company and uBriGene also terminated existing manufacturing and services agreements.

As consideration for the Repurchase Agreement, the Company agreed to pay to uBriGene a total purchase price (the “Purchase Price”) of $1.4 million, consisting of (i) an upfront payment of $0.1 million due within five (5) business days of the Effective Date and a (ii) subsequent amount of $1.3 million due on the date that is twelve (12) months after the closing date (the “Deferred Amount”). In the event that as of the original (or any extended) date on which the Deferred Amount is payable, the Company has, as of the date of the public reporting of its then-most recent quarterly audited or unaudited financial statements, net assets below $20 million, then the Company may, upon written notice to uBriGene, elect to delay its payment obligation of the Deferred Amount by an additional six (6) months, with no limit on the number of such extensions available to the Company. Notwithstanding the foregoing, if the Company has not paid the Deferred Amount in full as of the date that is twelve (12) months after closing of the Repurchase Agreement, any amounts that remain outstanding will accrue interest at a rate of 5% per annum beginning on the date that is twelve (12) months after closing and until the Deferred Amount is paid in full. Additionally, in connection with the termination of the agreements described above under the Repurchase Agreement, the Company agreed to forgive a net receivable from uBriGene of approximately $3.3 million, comprised of outstanding receivables of $6.9 million and payables of $3.6 million, resulting in total purchase consideration in the Repurchase Transactions of approximately $4.7 million. The upfront payment of $0.1 million was paid in July 2024, and as of September 30, 2024, the $1.3 million Deferred Amount was recorded in Accrued Other Expenses (see Note 7).

The Company allocated the total purchase consideration of $4.7 million to the Repurchased Assets on a relative fair value basis. The Company used a third-party to perform a valuation of the repurchased equipment, which resulted in a fair value less costs to sell of approximately $2.2 million. The remaining purchase consideration of $2.5 million was allocated to the supplies repurchased. The supplies repurchased with no alternative future use were recognized as research and development expense in an amount of $2.2 million. Repurchased supplies with an alternative future use of $0.3 million were also recognized in research and development expense, as the Company does not have plans to resume operations in the facility, and it intends to dispose of the supplies in a single transaction with the equipment. The Company concluded that the disposal group, which includes the repurchased equipment assets and associated supplies, with an aggregate value of approximately $2.2 million met the criteria to be classified as held for sale at the date of acquisition. As of September 30, 2024, the disposal group continues to be held for sale.

Note 6 – Property, Plant and Equipment, and Asset Impairment

At September 30, 2024, and December 31, 2023, property, plant and equipment consisted of the following:


	Estimated Useful	September 30,		December 31,
($ in thousands)	Life (in years)	2024		2023
Leasehold improvements	9		7,694		7,694
Construction in process	N/A		—		29
Total property, plant and equipment			7,694		7,723
Less: impairment loss			(2,176)		—
Less: accumulated depreciation			(5,097)		(4,476)
Property, plant and equipment, net		$	421	$	3,247

Depreciation expense for the three months ended September 30, 2024 and 2023, was approximately $0.1 million and $0.3 million, respectively, and was recorded in research and development expense in the Unaudited Statements of Operations. Depreciation expense for the nine months ended September 30, 2024 and 2023, was approximately $0.6 million and $1.6 million, respectively, and was recorded in research and development expense in the Unaudited Statements of Operations.

Impairment of Long-Lived Assets

During the second quarter of fiscal year 2024, the Company concluded it had a triggering event requiring assessment of impairment for certain leasehold improvements and the related right-of-use asset. The Company assessed the carrying

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value of the asset group consisting of the leasehold improvements and right-of-use asset in accordance with ASC 360, given the significant changes to the Company’s operations, operating cash and the repurchase of equipment. The assessment of the recoverability of the asset group concluded that there was impairment on the carrying value of the asset group of approximately $2.6 million, which was allocated on a pro rata basis using the relative carrying amounts of the assets. Approximately $2.2 million of the impairment loss was allocated to the leasehold improvements, with the remaining $0.4 million allocated to the right-of-use asset.

Note 7 - Accounts Payable and Accrued Expenses

At September 30, 2024, and December 31, 2023, accounts payable and accrued expenses consisted of the following:


	September 30,		December 31,
($ in thousands)	2024		2023
Accounts payable	$	8,759	$	6,322
Accrued research and development		561		4,118
Accrued compensation		984		2,838
Other ⁽¹⁾		1,757		739
Total accounts payable and accrued expenses	$	12,061	$	14,017

⁽¹⁾ Other includes approximately $1.3 million of accrued consideration for the uBriGene Asset Purchase Agreement, see Note 5.

Note 8 – Notes Payable

On April 11, 2023, the Company’s long-term debt facility (the “Term Loan”) with Runway Growth Finance Corp. (“Runway”), originally entered into on March 4, 2023, was terminated upon receipt by Runway of a payoff amount of $30.4 million from the Company comprised of principal, interest and the applicable final payment amount. The loss on extinguishment was recorded in interest expense in the Unaudited Statements of Operations. For the nine months ended September 30, 2024, and 2023, the Company recorded the following components in interest expense:


	For the nine months ended September 30,
($ in thousands)	2024		2023
Interest expense	$	—	$	1,187
Amortization of Debt Discount		—		118
Loss on Extinguishment		—		2,796
Other		4		11
Total Interest Expense	$	4	$	4,112

Note 9 - Stockholders’ Equity

Registration Statements

On April 23, 2021, the Company filed a shelf registration statement on Form S-3 (File No. 333-255476) (the “2021 S-3”), which was declared effective on May 24, 2021. Under the 2021 S-3, the Company was able to sell up to a total of $200.0 million of its securities. The 2021 S-3 expired on May 24, 2024. The Company sold approximately $4.4 million of securities under the 2021 S-3.

On May 31, 2024, the Company filed a shelf registration statement on Form S-3 (File No. 333-279891) (the “2024 S-3”), which was declared effective on June 12, 2024. Under the 2024 S-3, the Company may sell up to a total of $40.0 million of its securities. As of September 30, 2024, approximately $36.3 million of the 2024 S-3 remains available for sales of securities.

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As of the filing of this Form 10-Q, the Company is subject to the General Instruction I.B.6 to Form S-3, known as the “baby shelf rules,” which limit the number of securities it can sell under its registration statements on Form S-3.

May 2024 Equity Offering

On April 29, 2024, the Company commenced a best efforts equity offering with an institutional investor (the “Investor”) (the “May 2024 Offering”) of an aggregate of (i) 1,160,000 shares of common stock, (ii) pre-funded warrants (the “May 2024 Pre-Funded Warrants”) to purchase up to an aggregate of 15,717,638 shares of common stock (the “May 2024 Pre-Funded Warrant Shares”), (iii) Series A-1 warrants (the “Series A-1 Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-1 Warrant Shares”), (iv) Series A-2 warrants (the “Series A-2 Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-2 Warrant Shares”), and (v) Series A-3 warrants (the “Series A-3 Warrants,” and together with the Series A-1 Warrants and Series A-2 Warrants, the “Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-3 Warrant Shares”). Each share of common stock or May 2024 Pre-Funded Warrant was sold together with one Series A-1 Warrant to purchase one share of common stock, one Series A-2 Warrant to purchase one share of common stock, and one Series A-3 Warrant to purchase one share of common stock. The public offering price for each share of common stock and accompanying Warrants was $0.237, and the public offering price for each May 2024 Pre-Funded Warrant and accompanying Warrants was $0.2369. The May 2024 Pre-Funded Warrants have an exercise price of $0.0001 per share, were exercisable immediately and will expire when exercised in full. Each Warrant has an exercise price of $0.237 per share, will be exercisable beginning on the effective date of stockholder approval of the issuance of the shares upon exercise of the Warrants (the “Warrant Stockholder Approval”). The Series A-1 Warrant will expire on the five-year anniversary of the Warrant Stockholder Approval. The Series A-2 Warrant will expire on the twenty-four-month anniversary of the Warrant Stockholder Approval. The Series A-3 Warrant will expire on the nine-month anniversary of the Warrant Stockholder Approval. The Warrants contain customary anti-dilution adjustments to the exercise price, including for share splits, share dividends, rights offering and pro rata distributions.

The net proceeds of the May 2024 Offering, after deducting the fees and expenses of the Placement Agent (as defined below), described in more detail below, and other offering expenses payable by us, but excluding the net proceeds, if any, from the exercise of the Warrants, was approximately $3.2 million. The May 2024 Offering closed on May 2, 2024.

In connection with the May 2024 Offering, the Company also entered into a warrant amendment agreement (the “Warrant Amendment Agreement”) with the Investor. Under the Warrant Amendment Agreement, the Company agreed to amend certain existing warrants to purchase up to 2,588,236 shares of common stock that were previously issued in October 2023 to the Investor, with an exercise price of $1.58 per share (the “Existing Warrants”), in consideration for their purchase of the securities in the May 2024 Offering, as follows: (i) lower the exercise price of the Existing Warrants to $0.237 per share, (ii) provide that the Existing Warrants, as amended, will not be exercisable until the receipt of Warrant Stockholder Approval for the exercisability of the Warrants in the May 2024 Offering, and (iii) extend the original expiration date of the Existing Warrants by five years following the receipt of such Warrant Stockholder Approval. The Warrant Amendment Agreement became effective on May 2, 2024.

June 2024 Registered Direct Offering and Concurrent Private Placement of Warrants (the “June 2024 Offering”)

On June 19, 2024, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with an institutional investor (the “June 2024 Investor”), pursuant to which the Company agreed to issue and sell, in a registered direct offering priced at-the-market under the rules of Nasdaq (the “Registered Direct Offering”), (i) 3,025,000 shares of common stock, at a price per Share of $0.41 and (ii) pre-funded warrants (the “Pre-Funded Warrants”) to purchase up to 3,105,000 shares of our common stock, at a price per Pre-Funded Warrant equal to $0.4099, the price per share of common stock, less $0.0001.

The Pre-Funded Warrants were sold in lieu of shares of common stock to the June 2024 Investor. The Pre-Funded Warrants have an exercise price of $0.0001 per share, became exercisable upon issuance and remain exercisable until exercised in full.

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The Registered Direct Offering closed on June 21, 2024. The Company intends to use the net proceeds of approximately $2.1 million from the Registered Direct Offering for general corporate purposes and working capital requirements.

In a concurrent private placement, pursuant to the terms of the Purchase Agreement, the Company also agreed to issue and sell to the June 2024 Investor unregistered warrants (the “Private Placement Warrants”) to purchase up to 6,130,000 shares of common stock, at an offering price of $0.41 per Private Placement Warrant to purchase one share of common stock (the “Private Placement” and, together with the Registered Direct Offering, the “Offerings”) (which offering price was included in the purchase price per share of common stock or Pre-Funded Warrant). The Private Placement Warrants have an exercise price of $0.41 per share (subject to customary adjustments as set forth in the Private Placement Warrants), were exercisable upon issuance and will expire five years from the date of issuance. The Private Placement Warrants contain customary anti-dilution adjustments to the exercise price, including for share splits, share dividends, rights offering and pro rata distributions. The resale of the shares of common stock issuable upon the exercise of the Private Placement Warrants was subsequently registered in July 2024 on a Form S-1 (File No. 333-280927).

H.C. Wainwright & Co., LLC (“Wainwright”) acted as the exclusive placement agent in connection with the Offerings under an Engagement Letter, dated as of June 18, 2024, between us and Wainwright (the “Engagement Letter”). Pursuant to the Engagement Letter, the Company issued to Wainwright (or its designees) warrants to purchase up to 367,800 shares of common stock (the “Wainwright Warrants” and, together with the Private Placement Warrants, the “2024 Warrants”). The Wainwright Warrants have substantially the same terms as the Private Placement Warrants, except that the Wainwright Warrants will expire five years from the commencement of the sales of the Offerings and have an exercise price of $0.5125 per share (subject to customary adjustment as set forth in the Wainwright Warrants), representing 125% of the purchase price per share of common stock in the Registered Direct Offering.

At-the-Market Offering

In July 2018, the Company entered into an At-the-Market Issuance Sales Agreement (the “Mustang ATM”) with B. Riley Securities, Inc. (formerly B. Riley FBR, Inc.), Cantor Fitzgerald & Co., National Securities Corporation (now B. Riley FBR, Inc.), and Oppenheimer & Co. Inc. (each an “Agent” and collectively, the “Agents”), relating to the sale of shares of common stock pursuant to a registration statement on Form S-3 (File No. 333-249657). Under the Mustang ATM, the Company pays the Agents a commission rate of up to 3.0% of the gross proceeds from the sale of any shares of common stock. On December 31, 2020, the Mustang ATM was amended to add Wainwright as an Agent. On April 14, 2023, the Mustang ATM was amended to add the limitations imposed by General Instruction I.B.6 to Form S-3 and remove Oppenheimer & Co., Inc. as an Agent. On May 31, 2024, the Company delivered notice to the Agents to terminate the Mustang ATM, which was effective June 5, 2024.

On May 31, 2024, the Company entered into an At-the-Market Offering Agreement (the “Offering Agreement”) with Wainwright (the “Manager”) under which the Company may offer and sell, from time to time at its sole discretion, shares of its common stock through or to the Manager pursuant to the 2024 S-3. Under the Offering Agreement, the Company pays the Manager a commission of 3.0% of the gross proceeds from the sales of any shares of common stock. The Company will also reimburse the Manager for certain expenses incurred in connection with the Offering Agreement. The Company and the Manager may each terminate the Sales Agreement at any time upon specified prior written notice.

During the nine months ended September 30, 2024, the Company issued approximately 2.7 million shares of common stock at an average price of $0.44 for gross proceeds of $1.2 million under the Offering Agreement. In connection with these sales, the Company paid aggregate fees of approximately $45,000. During the nine months ended September 30, 2023, the Company issued approximately 52,000 shares of common stock at an average price of $3.15 for gross proceeds of $0.2 million under the Mustang ATM. In connection with these sales, the Company paid aggregate fees of approximately $3,000.

Equity Incentive Plan

The Company has in effect the 2016 Incentive Plan (the “Incentive Plan”). The Incentive Plan was adopted in 2016 by the Company’s stockholders and the compensation committee of the Company’s board of directors and is authorized to grant stock-based awards to directors, officers, employees and consultants. The plan initially authorized grants to issue up to

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133,333 shares of authorized but unissued common stock, expires 10 years from adoption, and limits the term of each option to no more than 10 years from the date of grant. In June 2018, the Company’s stockholders approved an amendment to the Incentive Plan to increase the number of authorized shares issuable by 200,000 shares, for a total of 333,333 shares. In June 2021, the Company’s stockholders approved an amendment to the Incentive Plan to increase the number of authorized shares issuable by 200,000 shares, for a total of 533,333 shares. In June 2022, the Company’s stockholders approved an amendment to the Incentive Plan to increase the number of authorized shares issuable by 200,000 shares, for a total of 733,333 shares.

As of September 30, 2024, 397,723 shares were available for future issuance under the Incentive Plan.

Stock Options

The following table summarizes stock option activities for the nine months ended September 30, 2024:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Stock Options	Exercise Price		years)
Outstanding at December 31, 2023	76,112	$	85.95	3.31
Outstanding at September 30, 2024	76,112	$	85.95	2.56
Options vested and exercisable at September 30, 2024	47,570	$	85.95	2.56

As of September 30, 2024, the Company had no unrecognized stock-based compensation expense related to options. The Company accounts for forfeited awards as they occur.

Restricted Stock

The following table summarizes restricted stock award activities for the nine months ended September 30, 2024:


		Weighted Average
		Grant Date Fair
	Number of Shares	Value
Nonvested at December 31, 2023	64,706	$	11.59
Vested	(4,595)		54.45
Nonvested at September 30, 2024	60,111	$	8.32

As of September 30, 2024, the Company had unrecognized stock-based compensation expense related to restricted stock of $0.2 million, which is expected to be recognized over the remaining weighted average vesting period of approximately 1.3 years.

Restricted Stock Units

Certain employees and consultants have been awarded restricted stock units with time-based vesting. The following table summarizes restricted stock units’ activities for the nine months ended September 30, 2024:


		Weighted Average
		Grant Date Fair
	Number of Units	Value
Nonvested at December 31, 2023	95,197	$	18.78
Forfeited	(64,892)		18.19
Vested	(18,926)		23.26
Nonvested at September 30, 2024	11,379	$	14.69

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As of September 30, 2024, the Company had unrecognized stock-based compensation expense related to restricted stock units of approximately $38,000, which is expected to be recognized over the remaining weighted average vesting period of approximately 1.8 years.

The following table summarizes stock-based compensation expense for the three and nine months ended September 30, 2024 and 2023 (in thousands):


	For the three months ended September 30,				For the nine months ended September 30,
	2024		2023		2024		2023
General and administrative	$	52	$	119	$	150	$	381
Research and development		(10)		(19)		(650)		(1)
Total stock-based compensation expense	$	42	$	100	$	(500)	$	380

On April 12, 2024, the Company reduced its workforce by approximately 81 percent, which resulted in the forfeiture of a significant number of outstanding restricted stock units and the reversal of previously incurred stock-based compensation expense.

Employee Stock Purchase Plan

Eligible employees can purchase the Company’s common stock at the end of a predetermined offering period at 85% of the lower of the fair market value at the beginning or end of the offering period. The Employee Stock Purchase Plan (“ESPP”) is compensatory and results in stock-based compensation expense. The ESPP was initially authorized in 2019 to sell up to 26,667 shares of authorized but unissued common stock. In June 2021, the Company’s stockholders approved an amendment to the ESPP to increase the number of authorized shares issuable by 40,000 shares. In addition, in June 2023, the Company’s stockholders approved an amendment to the ESPP to increase the number of authorized shares issuable thereunder by 400,000 for a total of 466,667 shares.

As of September 30, 2024, 128,352 shares have been purchased and 338,315 shares are available for future sale under the Company’s ESPP.

Warrants

A summary of warrant activities for the nine months ended September 30, 2024, is presented below:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Warrants	Exercise Price		years)
Outstanding as of December 31, 2023	4,481,868	$	1.34	5.34
Exercised	(20,490,874)		—	—
Granted	76,966,010		0.19	2.50
Outstanding as of September 30, 2024	60,957,004	$	0.29	2.73

Upon the exercise of warrants, the Company will issue new shares of common stock. In connection with the Company’s Registered Direct Offering on October 26, 2023, the Company issued pre-funded warrants to purchase up to 1,668,236 shares of common stock, and in a concurrent private placement, the Company issued unregistered warrants to purchase up to 2,588,236 shares of common stock, and the resale of the underlying shares of common stock were subsequently registered in April 2024 on Form S-1 (File No. 333-275997). In connection with these offerings, H.C. Wainwright received Placement Agent Warrants to purchase up to 155,294 shares of common stock. In connection with the Public Offering the Company completed in May 2024, the 2,588,236 unregistered warrants were repriced from the original exercise price of $1.58 per share to $0.237 per share.

In connection with the May 2024 Offering, the Company issued pre-funded warrants to purchase up to 15,717,638 shares of common stock and issued three series of warrants to purchase up to 50,632,914 shares of common stock. In connection

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with these offerings, Wainwright received Placement Agent Warrants to purchase up to 1,012,658 shares of common stock.

In connection with the Registered Direct Offering, the Company issued pre-funded warrants to purchase up to 3,105,000 shares of common stock, and in the concurrent Private Placement, the Company issued unregistered warrants to purchase up to 6,130,000 shares of common stock. The resale of the underlying shares of common stock were subsequently registered in July 2024 on Form S-1 (File No. 333-280927). In connection with these offerings, Wainwright received Placement Agent Warrants to purchase up to 367,800 shares of common stock.

During the nine months ended September 30, 2024, all of the 1,668,236 pre-funded warrants issued in the October Registered Direct Offering were exercised at an exercise price of $0.001 per share, and all of the 18,822,638 pre-funded warrants issued in the May 2024 Offering and the June Registered Direct Offering were exercised at an exercise price of $0.0001 per share.

Note 10 – Net Loss per Share

Net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period less unvested restricted stock. Since dividends are declared, paid and set aside among the holders of shares of common stock and Class A common shares pro-rata on an as-if-converted basis, the two-class method of computing net loss per share is not required. Diluted net loss per share does not reflect the effect of shares of common stock to be issued upon the exercise of warrants or outstanding Class A preferred shares, as their inclusion would be anti-dilutive. The two-class method is an earnings allocation formula that treats participating securities as having rights that would otherwise have been available to common stockholders. In addition, as our non-pre-funded warrants are participating securities, we are required to calculate diluted earnings per share under the if-converted method and utilize the most dilutive result. In periods where there is a net loss, no allocation of undistributed net loss to non-pre-funded warrants is performed as the holders of our non-pre-funded warrants are not contractually obligated to participate in our losses.

The table below summarizes potentially dilutive securities that were not considered in the computation of diluted net loss per share because they would be anti-dilutive.


	For the nine months ended September 30,
	2024	2023
Warrants	60,957,004	70,102
Options	76,112	76,112
Class A Preferred Shares	250,000	250,000
Unvested restricted stock awards	60,111	64,706
Unvested restricted stock units	11,379	106,100
Total	61,354,606	567,020

Note 11 – Income Taxes

The Company incurred net operating losses and recorded a full valuation allowance against net deferred tax assets for all periods presented. Accordingly, the Company has not recorded a provision for federal or state income taxes.

The Company is subject to US federal and state income taxes. Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced by a valuation allowance when, in the opinion of Management, it is more likely than not that some portion, or all, of the deferred tax asset will not be realized.

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Note 12 – Commitments and Contingencies

Indemnification

In accordance with its Certificate of Incorporation, amended and restated bylaws and indemnification agreements, the Company has indemnification obligations to its officers and directors for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. The Company has director and officer insurance to address such claims. The Company also provides indemnification of contractual counterparties in certain situations, including without limitation to clinical sites, service providers and licensors.

Leases

The Company leases office space under an agreement classified as operating leases that expires in October 2026. On June 28, 2024, the Company terminated the lease of its Mercantile Center Facility for a termination fee of $40,000. The Company’s lease liabilities result from the lease of its Plantation Street Facility, which expires in 2026. Such leases do not require any contingent rental payments, impose any financial restrictions, or contain any residual value guarantees. Certain of the Company’s leases include renewal options and escalation clauses; renewal options have not been included in the calculation of the lease liabilities and right of use assets as the Company is not reasonably certain to exercise the options. The Company does not act as a lessor or have any leases classified as financing leases.

During the second quarter of fiscal year 2024, the Company identified triggering events that required an impairment of the asset group consisting of the right-of-use asset and associated leasehold improvements. The assessment concluded that impairment existed, and the impairment loss was allocated to the leasehold improvements and right-of-use assets based on the relative carrying amounts of the assets (see Note 6). As of September 30, 2024, the Company had operating lease liabilities of $1.0 million and right of use assets of $0.1 million, which were included in the Unaudited Balance Sheet. At December 31, 2023, the Company had operating lease liabilities of $2.5 million and right of use assets of $1.6 million, which were included in the Unaudited Balance Sheet.

The following summarizes quantitative information about the Company’s operating leases:


	For the Nine Months Ended
		September 30,		September 30,
($ in thousands)	2024		2023
Lease cost
Operating lease cost	$	113	$	592
Variable lease cost		149		544
Total	$	262	$	1,136


	For the Nine Months Ended
		September 30,			September 30,
($ in thousands)	2024			2023
Operating cash flows from operating leases	$	406		$	395
Gain on lease modification	$	314		$	220
Weighted-average remaining lease term – operating leases		2.0			4.7
Weighted-average discount rate – operating leases		9.0	%		9.1	%

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Maturities of our operating leases, excluding short-term leases, are as follows:


($ in thousands)	Future Lease Liability
Three months ended December 31, 2024	$	127
Year ended December 31, 2025		516
Year ended December 31, 2026		439
Total		1,082
Less present value discount		(99)
Operating lease liabilities	$	983

Note 13 – Subsequent Events

On October 24, 2024, the Company entered into an inducement offer letter agreement (the “Inducement Letter”) with an institutional investor that held certain outstanding Series A-3 warrants (the “Existing Warrants”) to purchase up to an aggregate of 16,877,638 shares of the Company’s common stock, originally issued to such investor on May 2, 2024 (the “Existing Warrants”). The Existing Warrants had an exercise price of $0.237 per share.

Pursuant to the Inducement Letter, the investor agreed to exercise in full, for cash, the Existing Warrants in consideration for the Company’s agreement to issue in a private placement (x) new Series B-1 Common Stock purchase warrants (the “New Series B-1 Warrants”) to purchase up to 16,877,638 shares of Common Stock (the “New Series B-1 Warrant Shares”) and (y) new Series B-2 Common Stock Purchase Warrants (the “New Series B-2 Warrants” and, together with the New Series B-1 Warrants, the “New Warrants”) to purchase up to 16,877,638 shares of Common Stock (the “New Series B-2 Warrant Shares” and, together with the New Series B-1 Warrant Shares, the “New Warrant Shares”). Each Warrant has an exercise price of $0.27 per share and will be exercisable beginning on the effective date of stockholder approval of the issuance of the shares upon exercise of the Warrants (the “Warrant Stockholder Approval”). The New Series B-1 Warrant will expire on the five-year anniversary of the Warrant Stockholder Approval. The New Series B-2 Warrant will expire on the twelve (12) month anniversary of the Warrant Stockholder Approval.

The closing of the transaction contemplated pursuant to the Inducement Letter occurred on October 25, 2024 (the “Closing Date”). The Company received aggregate gross proceeds of approximately $4.0 million from the exercise of the Existing Warrants by the investor, before deducting placement agent fees and other expenses payable by the Company. The Company intends to use the proceeds for working capital and general corporate purposes.

The Company engaged Wainwright to act as its exclusive placement agent in connection with the transaction summarized above and paid Wainwright a cash fee equal to 7.0% of the aggregate gross proceeds from the exercise of the Existing Warrants. In addition, the Company (i) reimbursed Wainwright for $50,000 of the fees and expenses of Wainwright’s legal counsel and other of its out-of-pocket expenses, (ii) reimbursed Wainwright for its non-accountable expenses in the amount of $25,000, and (iii) paid a management fee equal to 1.0% of the gross proceeds raised. The Company also issued to Wainwright or its designees (“PA Warrant Holders”) placement agent warrants (the “Placement Agent Warrants”) to purchase up to 1,012,658 shares of Common Stock (the “Placement Agent Warrant Shares”). The Placement Agent Warrants have the same terms as the New Series B-1 Warrants, except that the Placement Agent Warrants have an exercise price equal to $0.2963 per share.

The issuance or resale of the shares of common stock underlying the Existing Warrants has been registered pursuant to an existing registration statement on Form S-1 (File No. 333-278006), declared effective by the Securities and Exchange Commission (the “SEC”) on April 29, 2024.

The Company has agreed to file a registration statement providing for the resale of the New Warrant Shares (the “Resale Registration Statement”) within 30 calendar days of the date of the Inducement Letter, and to use best efforts to cause the Resale Registration Statement to be declared effective by the SEC within 60 calendar days following the date of the Inducement Letter and to keep the Resale Registration Statement effective at all times until the investor no longer owns any New Warrants or New Warrant Shares.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with our financial statements and the related notes included elsewhere in this Form 10-Q. Our financial statements have been prepared in accordance with U.S. GAAP. The following discussion and analysis contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), which are often indicated by terms such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “goal,” “intend,” “look forward to,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would” and similar expressions, include, but are not limited to, any statements relating to our growth strategy and product development programs, including the Company’s expectations with respect to the consummation of the sale of its manufacturing facility, the timing of and our ability to make regulatory filings such as Investigational New Drug (“IND”) applications and other applications and to obtain regulatory approvals for our product candidates, statements concerning the potential of therapies and product candidates, and any other statements that are not historical facts. All forward-looking statements included in this document are based on information available to us on the date hereof, and we assume no obligation to update any such forward-looking statements. Our business and financial performance are subject to substantial risks and uncertainties. Actual results could differ materially from those projected in the forward-looking statements. In evaluating our business, you should carefully consider the information set forth under Part II, Item 1A “Risk Factors” herein.

Overview

We are a clinical-stage biopharmaceutical company focused on translating today’s medical breakthroughs in cell and gene therapies into potential cures for hematologic cancers and solid tumors. We aim to acquire rights to these technologies by licensing or otherwise acquiring an ownership interest in the technologies, funding their research and development and eventually either out-licensing or bringing the technologies to market.

Our pipeline is currently focused in two core areas: CAR T therapies for hematologic malignancies and CAR T therapies for solid tumors. For these therapies we have partnered with world class research institutions, including the City of Hope National Medical Center (“COH” or “City of Hope”), Fred Hutchinson Cancer Center (“Fred Hutch”), and Nationwide Children’s Hospital (“Nationwide”).

We expect to incur substantial expenses for the foreseeable future relating to research, development and commercialization of our potential products. However, there can be no assurance that we will be successful in securing additional resources when needed, on terms acceptable to us, if at all. Therefore, there exists substantial doubt about our ability to continue as a going concern. The unaudited financial statements do not include any adjustments related to the recoverability of assets that might be necessary despite this uncertainty.

CAR T Therapies

Our pipeline of CAR T therapies is being developed under exclusive licenses from several world class research institutions. Our strategy is to license these technologies, support preclinical and clinical research activities by our partners and transfer the underlying technology to our or our contract manufacturer’s cell processing facility in order to conduct our own clinical trials.

We are developing CAR T therapy for hematologic malignancies in partnership with Fred Hutch targeting CD20 (MB-106). In May 2021, we announced that the U.S. Food and Drug Administration (“FDA”) accepted our Investigational New Drug (“IND”) Application for MB-106. As of September 30, 2024, approximately 40 patients have been treated in an ongoing Phase 1 clinical trial sponsored by Fred Hutch (ClinicalTrials.gov Identifier: NCT03277729), and approximately 20 patients have been treated in the Phase 1 clinical trial sponsored by us (ClinicalTrials.gov Identifier: NCT05360238). In 2023, we received Safety Review Committee approval to continue dose escalation in all three active arms of the ongoing Mustang-sponsored Phase 1 trial. We presented the latest results, demonstrating a favorable safety profile, complete

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response rate, and durability, from the ongoing Mustang-sponsored Phase 1 trial at the 2023 American Society of Hematology (“ASH”) Annual Meeting.

We are also developing CAR T therapy for solid tumors in partnership with COH targeting IL13Rα2 (MB-101). In addition, we have partnered with Nationwide for a herpes simplex virus type 1 (“HSV-1”) oncolytic virus (MB-108) in order to enhance the activity of MB-101 for the treatment of patients with high-grade malignant brain tumors. The Phase 1 clinical trial sponsored by COH for MB-101 (ClinicalTrials.gov Identifier: NCT02208362) has completed the treatment phase and patients continue to be assessed for long-term safety. A Phase 1 clinical trial sponsored by the University of Alabama at Birmingham (“UAB”) for MB-108 (ClinicalTrials.gov Identifier: NCT03657576) began during the third quarter of 2019. In October 2023, we announced that the FDA accepted our IND application for the combination of MB-101 and MB-108 – which is referred to as MB-109 – for the treatment of patients with IL13Rα2+ relapsed or refractory glioblastoma (“GBM”) and high-grade astrocytoma.

On May 18, 2023, we announced a series of changes resulting from a review of our portfolio of product candidates to determine the future strategy of our programs and the proper allocation of our resources. Following this review, we determined to discontinue development of our MB-102 (CD123), MB-103 (HER2), MB-104 (CS1) and MB-105 (PSCA) programs, all of which were CAR T therapies being developed in partnership with City of Hope.

MB-106 (CD20-targeted CAR T cell therapy for Non-Hodgkin Lymphoma and Chronic Lymphocytic Leukemia)

In the first quarter of 2024, we completed a successful End-of-Phase 1 meeting with the FDA regarding a potential pivotal Phase 2 single-arm clinical trial for the treatment of WM. Per the discussions, the FDA agreed with the proposed overall design of the pivotal trial for WM at the recommended dose of 1 x 10⁷CAR-T cells/kg and requested only minimal modifications to the study protocol. No additional nonclinical studies are expected prior to Phase 2 or a Biologics License Application (“BLA”) filing. Due to limited resources, and as a result of the reduction in work force described below, we do not expect to initiate our pivotal Phase 2 single-arm clinical trial of MB-106 for the treatment of WM trial in 2024. Subject to available funds, we intend to rely on third party service providers to conduct study and manufacturing services to advance our priority potential product candidates.

Also in the first quarter of 2024, we completed enrollment of the indolent lymphoma arm in our multicenter Phase 1 trial. The tenth and final patient enrolled on that arm was a patient with follicular lymphoma (FL) who achieved a complete response following treatment with 1 x 10⁷ CAR-T cells/kg. As a result, the overall complete response rate for FL in the Phase 1 portion of this trial was sustained at 100% (N=6), with no occurrence of CRS above grade 1 and no ICANS of any grade, despite not using prophylactic tocilizumab or dexamethasone.

In March 2024, we announced plans to collaborate with Fred Hutch for a proof-of-concept Phase 1 investigator-sponsored clinical trial evaluating MB-106 in autoimmune diseases.

In March 2024, we were granted the Regenerative Medicine Advanced Therapy (“RMAT”) designation by the FDA for the treatment of relapsed or refractory CD20 positive WM and FL, based on potential improvement in response as seen in clinical data to date. Drugs eligible for RMAT designation are those intended to treat, modify, reverse or cure a serious or life-threatening disease or condition, and that present preliminary clinical evidence indicating the drug has the potential to address unmet medical needs for such disease or condition. RMAT designation provides regenerative medicine advanced therapy products with the same benefits to expedite the development and review of a marketing application that are available to drugs that receive Breakthrough Therapy Designation. These advantages include timely advice and interactive communications with FDA, as well as proactive and collaborative involvement by senior FDA managers and experienced review and regulatory health project management staff. A product designated as an RMAT also may be eligible for other FDA-expedited programs, such as Priority Review. The FDA also may conduct a rolling review of products in its expedited programs, reviewing portions of a marketing application before the complete application is submitted.

In June 2024, we announced that updated data for MB-106 in the Phase 1/2 Fred Hutch investigator-sponsored trial showed a favorable safety and efficacy profile in 10 patients with WM. There was an overall response rate (“ORR”) of 90% with durable responses observed, including three complete responses (“CR”), two very good partial responses (“VGPR”), and four partial responses (“PR”). One of the patients who achieved a CR remained in remission for 31 months, with an

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immunoglobulin M (IgM) level that decreased rapidly to the normal range after treatment with MB-106 and remained normal since. Patients had a median of nine prior lines of therapy, and only one patient started additional anti-WM treatment after being treated with MB-106. From a safety perspective, CRS occurred in nine patients: five patients with grade 1 and four patients with grade 2. One patient experienced grade 1 ICANS. No grade 3 or 4 CRS or grade 2, 3 or 4 ICANS was observed, despite dose escalation.

In May 2024, we informed the clinical sites participating in the Mustang-sponsored Phase 1/2 study in non-Hodgkin lymphoma and chronic lymphocytic leukemia, MB106-CD20-001, that we had decided to close the trial. In June 2024, we similarly informed the clinical sites participating in the Mustang-sponsored Long-term Follow-up Study in Patients Previously Treated with Mustang Bio, Inc. CAR-T Cell Investigational Products, MB100-OBS-001, that we had decided to close that trial. As a result, further clinical development of MB-106 is currently focused solely on autoimmune diseases unless funding and resources become available to restart the program for hematologic malignancies. Planning for the aforementioned Phase 1 investigator-sponsored clinical trial in autoimmune diseases is in progress, with initiation of the trial planned for the fourth quarter of 2024 and proof-of-concept anticipated in 2025.

MB-109 (Combination of MB-101 CAR T Therapy with MB-108 Oncolytic Virus Therapy for Malignant Brain Tumors)

In October 2023, we received a safe-to-proceed “approval” from the FDA for our MB-109 IND application allowing us to initiate a Phase 1, open-label, non-randomized, multicenter study of MB-109 in patients with IL13Rα2+ recurrent GBM and high-grade astrocytoma. In this Phase 1 clinical study, we intend to evaluate the combination of CAR-T cells (MB-101) and the herpes simplex virus type 1 oncolytic virus (MB-108) in patients with IL13Rα2+ high-grade gliomas. The design of this study involves first a lead-in cohort, wherein patients are treated with MB-101 alone without prior MB-108 administration. After successful confirmation of the safety profile of MB-101 alone, the study will then investigate increasing doses of intratumorally administered MB-108 followed by dual intratumoral (ICT) and intraventricular (ICV) administration of MB-101.

On November 7, 2024, we announced that the FDA granted Orphan Drug Designation to Mustang for MB-108, a herpes simplex virus type 1 (“HSV-1”) oncolytic virus, for the treatment of malignant glioma. The Orphan Drug Designation provides certain incentives, such as tax credits toward the cost of clinical trials upon approval and prescription drug user fee waivers. If a product receives Orphan Drug Status from the FDA, that product is entitled to seven years of market exclusivity for the disease in which it has Orphan Drug designation, which is independent from intellectual property protection. Due to limited resources, we do not currently expect to initiate this study until such time, if any, that additional resources become available to us.

Terminated Product Candidates (Gene Therapies and in vivo CAR-T)

We previously developed several gene therapy product candidates, which included MB-117 and MB-217 (based on technologies licensed from St. Jude Children’s Research Hospital (“St. Jude”)) and MB-110 (based on technologies licensed from Leiden University Medical Centre (“LUMC”)). In April 2024, we entered into a termination and release agreement with St. Jude, pursuant to which we agreed to terminate the license agreement underpinning the MB-117 and MB-217 product candidates in exchange for a mutual release of liability and forgiveness by St. Jude of all amounts previously owing to them. Also in April 2024, we delivered a termination notice to LUMC pursuant to which we terminated the license agreement underpinning the MB-110 product candidate; we are currently in discussions with LUMC regarding the terms that will govern such termination. In June 2024, we also agreed with Mayo Foundation for Medical Education and Research (“Mayo Clinic”) to terminate the license agreement underpinning our (now former) preclinical in vivo CAR-T program, together with a related sponsored research agreement, in exchange for a mutual release of liability and forgiveness by Mayo Clinic of all amounts previously owed to them.

To date, we have not received approval for the sale of any of our product candidates in any market and, therefore, have not generated any product sales from our product candidates. In addition, we have incurred substantial operating losses since our inception, and expect to continue to incur significant operating losses for the foreseeable future and may never become profitable.

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Recent Developments

April 2024 Reduction in Work Force

On April 10, 2024, our board of directors approved a reduction of our workforce by approximately 81% of our employee base in order to reduce costs and preserve capital due to the fundraising environment and continued uncertainty regarding the CFIUS review of the sale of the Facility and the Transaction with uBriGene (Boston) Biosciences, Inc., a Delaware corporation (“uBriGene”). The workforce reduction took place primarily in April 2024 and was completed in the second quarter of 2024. As a result of these actions, we incurred personnel-related restructuring charges of approximately $0.2 million in connection with one-time employee termination cash expenditures, which were incurred in the second quarter of 2024.

Sale of Manufacturing Facility – Overview of Transaction

On May 18, 2023, we entered into an Asset Purchase Agreement (the “Original Asset Purchase Agreement”) with uBriGene, pursuant to which we agreed to sell our leasehold interest in our cell processing facility located in Worcester, Massachusetts (the “Facility”), and associated assets relating to the manufacturing and production of cell and gene therapies at the Facility to uBriGene (the “Transaction”). We and uBriGene subsequently entered into Amendment No. 1, dated as of June 29, 2023, and Amendment No. 2, dated as of July 28, 2023, to the Original Asset Purchase Agreement (the Original Asset Purchase Agreement, as so amended, the “Prior Asset Purchase Agreement”).

On July 28, 2023 (the “Closing Date”), pursuant to the Prior Asset Purchase Agreement, we completed the sale of all of our assets that primarily relate to the manufacturing and production of cell and gene therapies at the Facility (such operations, the “Transferred Operations” and such assets, the “Transferred Assets”) to uBriGene for upfront consideration of $6 million cash (the “Base Amount”). The Transferred Assets that were transferred to uBriGene on the Closing Date include, but are not limited to: (i) our leases of equipment and other personal property and all other property, equipment, machinery, tools, supplies, inventory, fixtures and all other personal property primarily related to the Transferred Operations, (ii) the data, information, methods, quality management systems, and intellectual property primarily used for the purposes of the Transferred Operations, (iii) the records and filings, including customer and vendor lists, production data, standard operating procedures and business records relating to, used in or arising under the Transferred Operations and (iv) all transferrable business license, permits and approvals necessary to operate the Transferred Operations. Certain Transferred Assets, including our lease of the Facility and contracts that are primarily used in the Transferred Operations (the “Transferred Contracts”) did not transfer to uBriGene on the Closing Date.

Voluntary Notice to U.S. Committee on Foreign Investment in the United States

uBriGene is an indirect, wholly owned subsidiary of UBrigene (Jiangsu) Biosciences Co., Ltd., a Chinese contract development and manufacturing organization. Under the Prior Asset Purchase Agreement, we and uBriGene agreed to use our reasonable best efforts to obtain clearance for the Transaction from the U.S. Committee on Foreign Investment in the United States (“CFIUS”), although obtaining such clearance was not a condition to closing the Transaction. In accordance with the Prior Asset Purchase Agreement, we and uBriGene previously submitted a voluntary joint notice to CFIUS on August 10, 2023.

Following an initial 45-day review period and subsequent 45-day investigation period, on November 13, 2023, CFIUS requested that we and uBriGene withdraw and re-file our joint voluntary notice to allow more time for review and discussion regarding the nature and extent of national security risk posed by the Transaction. Upon CFIUS’s request, we and uBriGene submitted a request to withdraw and re-file our joint voluntary notice to CFIUS, and on November 13, 2023, CFIUS granted this request, accepted the joint voluntary notice and commenced a new 45-day review period on November 14, 2023. CFIUS’s 45-day review ended on December 28, 2023. Since CFIUS had not concluded its review by December 28, 2023, the proceeding transitioned to a subsequent 45-day investigation period, which ended on February 12, 2024.

Following the 45-day review period and subsequent 45-day investigation period described above, on February 12, 2024, we and uBriGene requested permission to withdraw and re-file our joint voluntary notice to allow more time for review and discussion regarding the nature and extent of national security risk posed by the Transaction. Upon our joint request

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to withdraw and re-file their joint voluntary notice to CFIUS, on February 12, 2024, CFIUS granted this request, accepted the joint voluntary notice and commenced a new 45-day review period on February 13, 2024. CFIUS’s new 45-day review ended on March 28, 2024. Because CFIUS had not yet concluded its action, the proceeding transitioned to a second 45-day phase as CFIUS further investigated the Transaction. On March 28, 2024, CFIUS advised us that its investigation would be completed no later than May 13, 2024.

On May 13, 2024, together with uBriGene and CFIUS, we executed a National Security Agreement (the “NSA”), pursuant to which we and uBriGene agreed to abandon the Transaction and all other transactions contemplated by the Asset Purchase Agreement and the agreements entered into in connection therewith. The execution of the NSA was the result of CFIUS’ determination that such transactions posed a risk to the national security of the United States. We disagree with this position but did not feel a meaningful likelihood existed that the Transaction would be consummated in light of CFIUS’ objections. The NSA imposes certain conditions on us and uBriGene and its affiliates. Most significantly, we agreed (i) not to effect the Transaction with uBriGene or any of its affiliates; and (ii) to appoint a point of contact representative with whom CFIUS and uBriGene’s designated contact person may interact as needed. The NSA also obligates uBriGene to sell, or otherwise dispose of, the equipment assets purchased within 180 days after the execution of the NSA, with uBriGene able to eliminate some of its obligations under the NSA if it is able to sell the equipment assets purchased back to us within 45 days after the execution of the NSA (an “Expedited Divestment”).

June 2024 Repurchase of Assets

On June 27, 2024 (the “Effective Date”), we entered into an Asset Purchase Agreement (the “Asset Purchase Agreement”) with uBriGene, pursuant to which we agreed, subject to the terms and conditions set forth therein, to repurchase (the “Repurchase Transaction”) the assets, properties and rights previously transferred by the Company to uBriGene under the Prior Asset Purchase Agreement, excluding any inventory transferred under the Purchase Agreement that has been consumed or transferred to a third party by uBriGene since the closing of the Prior Asset Purchase Agreement (collectively, the “Repurchased Assets”). For the avoidance of doubt, “Repurchased Assets” also includes all Mustang Assets (as such term is defined in the NSA) that were previously sold, transferred, conveyed, assigned, delivered, or contributed by us or our affiliates to uBriGene or its affiliates, to the extent such assets have not been consumed or transferred to a third party by uBriGene since the closing of the Prior Asset Purchase Agreement. The Repurchased Assets do not include inventory acquired by uBriGene after the closing of the Prior Asset Purchase Agreement. We further agreed to assume all obligations, liabilities and commitments previously transferred by us to uBriGene under the Prior Asset Purchase Agreement. The Repurchase Transaction was intended to constitute an Expedited Divestment by uBriGene pursuant to the NSA with CFIUS.

As consideration for the Repurchase Transaction, we agreed to pay to uBriGene a total purchase price (the “Purchase Price”) of $1,395,138, consisting of (i) an upfront payment of $100,000 due within five (5) business days of the Effective Date and a (ii) subsequent amount of $1,295,138 due on the date that is twelve (12) months after the Closing (the “Deferred Amount”). In the event that as of the original (or any extended) date on which the Deferred Amount is payable we have, as of the date of the public reporting of our then-most recent quarterly audited or unaudited financial statements, net assets below $20 million, then we may, upon written notice to uBriGene, elect to delay our payment obligation of the Deferred Amount by an additional six (6) months, with no limit on the number of such extensions available to us. Notwithstanding the foregoing, if we have not paid the Deferred Amount in full as of the date that is 12 (twelve) months after closing of the Repurchase Transaction, any amounts that remain outstanding will accrue interest at a rate of 5% per annum beginning on the date that is 12 (twelve) months after closing and until the Deferred Amount is paid in full.

The Asset Purchase Agreement contains customary representations and warranties from both us and uBriGene with respect to each party. Additionally, we agreed to provide a purchase price allocation schedule to uBriGene within sixty (60) days of the Effective Date.

Pursuant to the terms of the Asset Purchase Agreement, we and uBriGene terminated the following agreements between us that were entered into in connection with the Asset Purchase Agreement: (i) the Manufacturing Services Agreement, dated July 28, 2023, and work orders entered into under such agreement, (ii) the Quality Services Agreement, dated July 28, 2023, (iii) the Subcontracting CDMO Agreement, dated July 28, 2023, and work orders entered into under such

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agreement, (iv) the Subcontracting Quality Services Agreement, dated July 28, 2023, and (v) the Transition Services Agreement.

Notification of Non-Compliance with Nasdaq Continued Listing Requirements

On March 13, 2024, we received a deficiency letter (the “Letter”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying us that we were not in compliance with the minimum stockholders’ equity requirement for continued listing on the Nasdaq Capital Market under Nasdaq Listing Rule 5550(b)(1) (the “Equity Rule”). The Equity Rule requires companies listed on The Nasdaq Capital Market to maintain stockholders’ equity of at least $2.5 million (or, in the alternative, a market value of listed securities of $35 million or net income from continued operations of $500,000 in the most recently completed fiscal year or in two of the last three most recently completed fiscal years). (the “Stockholders’ Equity Requirement”). As of December 31, 2023, we reported stockholders’ equity of $123,000, and as of September 30, 2024, we reported stockholders’ deficit of approximately $8.7 million.

The Letter had no immediate effect on our continued listing on Nasdaq, subject to our compliance with the other continued listing requirements. In accordance with the Nasdaq Listing Rules, we were provided 45 calendar days, or until April 29, 2024, to submit a plan to regain compliance with the Equity Rule (the “Compliance Plan”). We submitted our Compliance Plan on April 29, 2024, and the Staff granted our request for an extension of 180 calendar days through September 9, 2024, to regain compliance with the Equity Rule. We were unable to demonstrate compliance with the Equity Rule by September 9, 2024.

On September 10, 2024, the Staff formally notified us that it had determined to delist our securities from Nasdaq based upon our continued non-compliance with the Equity Rule unless we timely request a hearing before the Nasdaq Hearings Panel (the “Panel”). On September 17, 2024, we requested a hearing before the Panel, which stayed any further action by Nasdaq at least pending completion of the hearing and the expiration of any extension that may be granted by the Panel to us following the hearing. The hearing took place on October 29, 2024, and we are currently awaiting the decision of the Panel.

On May 16, 2024, we received a notice (the “Second Letter”) from the Staff indicating that the bid price of our common stock had closed below $1.00 per share for 30 consecutive business days and, as a result, we were not in compliance with Nasdaq Listing Rule 5550(a)(2), which sets forth the minimum bid price requirement for continued listing on The Nasdaq Capital Market (the “Bid Price Rule”). Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), we were afforded a 180-calendar day grace period, or until November 12, 2024, to evidence compliance with the Bid Price Rule, which necessitates a closing bid price of at least $1.00 per share for a minimum of ten consecutive business days by November 12, 2024. Accordingly, we do not expect to evidence compliance with the Bid Price Rule by November 12, 2024, and the bid price deficiency will thereafter serve as an additional basis for delisting from Nasdaq. We addressed our plan to regain compliance with the Bid Price Rule at our hearing before the Panel on October 29, 2024.

Financing Activities

May 2024 Equity Offering

On April 29, 2024, we commenced a best efforts equity offering with an institutional investor (the “Investor”) (the “May 2024 Offering”) of an aggregate of (i) 1,160,000 shares of common stock, (ii) pre-funded warrants (the “May 2024 Pre-Funded Warrants”) to purchase up to an aggregate of 15,717,638 shares of common stock (the “May 2024 Pre-Funded Warrant Shares”), (iii) Series A-1 warrants (the “Series A-1 Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-1 Warrant Shares”), (iv) Series A-2 warrants (the “Series A-2 Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-2 Warrant Shares”), and (v) Series A-3 warrants (the “Series A-3 Warrants,” and together with the Series A-1 Warrants and Series A-2 Warrants, the “Warrants”) to purchase up to an aggregate of 16,877,638 shares of common stock (the “Series A-3 Warrant Shares”). Each share of common stock or May 2024 Pre-Funded Warrant was sold together with one Series A-1 Warrant to purchase one share of common stock, one Series A-2 Warrant to purchase one share of common stock, and one Series A-3 Warrant to purchase one share of common stock. The equity offering price for each share of common stock and accompanying Warrants was $0.237, and the equity offering price for each May 2024 Pre-Funded Warrant and accompanying Warrants was $0.2369.

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The May 2024 Pre-Funded Warrants have an exercise price of $0.0001 per share, were exercisable immediately and will expire when exercised in full. Each Warrant has an exercise price of $0.237 per share, will be exercisable beginning on the effective date of stockholder approval of the issuance of the shares upon exercise of the Warrants (the “Warrant Stockholder Approval”), which was obtained on June 27, 2024. The Series A-1 Warrant will expire on the five-year anniversary of the Warrant Stockholder Approval. The Series A-2 Warrant will expire on the twenty-four-month anniversary of the Warrant Stockholder Approval. The Series A-3 Warrant will expire on the nine-month anniversary of the Warrant Stockholder Approval.

The net proceeds of the May 2024 Offering, after deducting the fees and expenses of the Placement Agent (as defined below), described in more detail below, and other offering expenses payable by us, but excluding the net proceeds, if any, from the exercise of the Warrants, were approximately $3.2 million. The May 2024 Offering closed on May 2, 2024.

In connection with the May 2024 Offering, we also entered into a warrant amendment agreement (the “Warrant Amendment Agreement”) with the Investor. Under the Warrant Amendment Agreement, we agreed to amend certain existing warrants to purchase up to 2,588,236 shares of common stock that were previously issued in October 2023 to the Investor, with an exercise price of $1.58 per share (the “Existing Warrants”), in consideration for their purchase of the securities in the May 2024 Offering, as follows: (i) lower the exercise price of the Existing Warrants to $0.237 per share, (ii) provide that the Existing Warrants, as amended, will not be exercisable until the receipt of Warrant Stockholder Approval for the exercisability of the Warrants in the May 2024 Offering, and (iii) extend the original expiration date of the Existing Warrants by five years following the receipt of such Warrant Stockholder Approval. The Warrant Amendment Agreement became effective on May 2, 2024.

June 2024 Registered Direct Offering and Concurrent Private Placement of Warrants (the “June 2024 Offering”)

On June 19, 2024, we entered into a Securities Purchase Agreement (the “June 2024 SPA”) with an institutional accredited investor, pursuant to which we agreed to issue and sell, in a registered direct offering priced at-the-market under the rules of Nasdaq (the “Registered Direct Offering”), (i) 3,025,000 shares of common stock, at a price per Share of $0.41 and (ii) pre-funded warrants (the “Pre-Funded Warrants”) to purchase up to 3,105,000 shares of our common stock, at a price per Pre-Funded Warrant equal to $0.4099, the price per share of common stock, less $0.0001.

The Pre-Funded Warrants were sold, in lieu of shares of common stock, to the investor, whose purchase of shares of common stock in the Registered Direct Offering would otherwise result in the investor, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the investor’s option upon issuance, 9.99%) of our outstanding common stock immediately following the completion of the Registered Direct Offering. The Pre-Funded Warrants have an exercise price of $0.0001 per share, became exercisable upon issuance and remain exercisable until exercised in full.

The Registered Direct Offering closed on June 21, 2024. We intend to use the net proceeds of approximately $2.1 million from the Registered Direct Offering for general corporate purposes and working capital requirements.

In a concurrent private placement, pursuant to the terms of the June 2024 SPA, we also agreed to issue and sell to the investor unregistered warrants (the “Private Placement Warrants”) to purchase up to 6,130,000 shares of common stock, at an offering price of $0.41 per Private Placement Warrant to purchase one share of common stock (the “Private Placement” and, together with the Registered Direct Offering, the “Offerings”) (which offering price was included in the purchase price per share of common stock or Pre-Funded Warrant). The Private Placement Warrants have an exercise price of $0.41 per share (subject to customary adjustments as set forth in the Private Placement Warrants), were exercisable upon issuance and will expire five years from the date of issuance. The Private Placement Warrants contain customary anti-dilution adjustments to the exercise price, including for share splits, share dividends, rights offering and pro rata distributions. The Private Placement Warrants were subsequently registered in July 2024 on Form S-1 (File No. 333-280927).

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stock (the “Wainwright Warrants” and, together with the Private Placement Warrants, the “2024 Warrants”). The Wainwright Warrants have substantially the same terms as the Private Placement Warrants, except that the Wainwright Warrants will expire five years from the commencement of the sales of the Offerings and have an exercise price of $0.5125 per share (subject to customary adjustment as set forth in the Wainwright Warrants), representing 125% of the purchase price per share of common stock in the Registered Direct Offering.

Warrant Inducement

On October 24, 2024, we entered into an inducement offer letter agreement (the “Inducement Letter”) with a certain investor (the “Holder”) that held certain outstanding Series A-3 warrants (the “Existing Warrants”) to purchase up to an aggregate of 16,877,638 shares of our common stock, originally issued to the Holder on May 2, 2024.

Pursuant to the Inducement Letter, the Holder agreed to exercise for cash the Series A-3 warrants at the exercise price of $0.237 per share in partial consideration for our agreement to issue in a private placement new Series B Common Stock purchase warrants to purchase up to (i) 16,877,638 shares of common stock (the “New Series B-1 Warrant Shares”) and (ii) 16,877,638 shares of common stock (the “New Series B-2 Warrant Shares”). Each Warrant has an exercise price of $0.27 per share and will be exercisable beginning on the effective date of stockholder approval of the issuance of the shares upon exercise of the Warrants (the “Warrant Stockholder Approval”). The New Series B-1 Warrant will expire on the five-year anniversary of the Warrant Stockholder Approval. The New Series B-2 Warrant will expire on the twelve-month anniversary of the Warrant Stockholder Approval.

The closing of the transaction contemplated pursuant to the Inducement Letter occurred on October 25, 2024 (the “Closing Date”). We received aggregate gross proceeds of approximately $4.0 million from the exercise of the Existing Warrants by the Holder, before deducting placement agent fees and other expenses payable by us. We intend to use the proceeds for general corporate purposes and working capital requirements.

We engaged Wainwright to act as our exclusive agent in connection with the transaction summarized above and paid Wainwright a cash fee equal to 7.0% of the aggregate gross proceeds from the exercise of the Existing Warrants. In addition, we (i) reimbursed Wainwright for $50,000 of the fees and expenses of Wainwright’s legal counsel and other of its out-of-pocket expenses, (ii) reimbursed Wainwright for its non-accountable expenses in the amount of $25,000, and (iii) paid a management fee equal to 1.0% of the gross proceeds raised. We also issued to Wainwright or its designees (“PA Warrant Holders”) placement agent warrants (the “Placement Agent Warrants”) to purchase up to 1,012,658 shares of Common Stock (the “Placement Agent Warrant Shares”). The Placement Agent Warrants have the same terms as the New Series B-1 Warrants, except that the Placement Agent Warrants have an exercise price equal to $0.2963 per share

Termination of 2018 At Market Issuance Sales Agreement

On May 31, 2024, we delivered notice to B. Riley Securities, Inc. (formerly B. Riley FBR, Inc.), Cantor Fitzgerald & Co., and the Manager (collectively, the “Agents”) to terminate our At Market Issuance Sales Agreement, dated July 27, 2018, as amended on July 20, 2020, December 31, 2020, and April 14, 2023 (collectively, the “2018 Sales Agreement”), with the Agents. Termination of the 2018 Sales Agreement was effective June 5, 2024, pursuant to Section 13(b) of the 2018 Sales Agreement.

May 2024 At the Market Offering Agreement

On May 31, 2024, we entered into an At the Market Offering Agreement (the “ATM Agreement”) with Wainwright (the “Manager”) under which we may offer and sell, from time to time at our sole discretion, shares of our common stock (the “ATM Shares”), through or to the Manager. The offer and sale, if any, of ATM Shares by us under the Offering Agreement will be made pursuant to our registration statement on Form S-3 (File No. 333-279891) (the “Registration Statement”) under the Securities Act, and the related prospectus included therein, filed with the SEC on May 31, 2024, and declared effective on June 12, 2024.

Under the ATM Agreement, the Manager may sell ATM Shares by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415(a)(4) under the Securities Act. The Manager will use commercially reasonable

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efforts to sell the ATM Shares from time to time, based upon instructions from us (including any price, time or size limits or other customary parameters or conditions we may impose). We will pay the Manager a commission of 3.0% of the gross proceeds from the sales of ATM Shares sold through the Manager under the ATM Agreement and have provided the Manager with customary indemnification and contribution rights. We will also reimburse the Manager for certain expenses incurred in connection with the ATM Agreement. Together with the Manager, we may each terminate the ATM Agreement at any time upon specified prior written notice.

The offering of ATM Shares pursuant to the ATM Agreement will terminate upon the earlier of (i) the sale of all ATM Shares subject to the ATM Agreement or (ii) the termination of the ATM Agreement in accordance with its terms.

During the nine months ended September 30, 2024, we issued approximately 2.7 million shares of common stock at an average price of $0.44 for gross proceeds of $1.2 million under the ATM Agreement. In connection with these sales, we paid aggregate fees of approximately $45,000.

In October 2024, we issued approximately 4.4 million shares of common stock at an average price of $0.34 for gross proceeds of approximately $1.5 million under the ATM Agreement. In connection with these sales, we paid aggregate fees of approximately $58,000.

The number of securities we are able to sell pursuant to the registration statements on Form S-3 is limited. See “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Liquidity and Capital Resources.”

Critical Accounting Policies and Use of Estimates

Our discussion and analysis of our financial condition and results of operations are based on our financial statements, which we have prepared in accordance with accounting principles generally accepted in the United States. Applying these principles requires our judgment in determining the appropriateness of acceptable accounting principles and methods of application in diverse and complex economic activities. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of expenses, assets and liabilities, and related disclosure of contingent assets and liabilities. We base our estimates on historical experience and other assumptions that we believe are reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions.

For a discussion of our critical accounting estimates, see the MD&A in the 2023 Form 10-K. There were no material changes in our critical accounting estimates or accounting policies from December 31, 2023.

Accounting Pronouncements

During the nine months ended September 30, 2024, there were no new accounting pronouncements or updates to recently issued accounting pronouncements disclosed in the 2023 Form 10-K that are expected to materially affect the Company’s present or future financial statements.

Smaller Reporting Company Status

We are a “smaller reporting company,” within the meaning of federal securities laws, meaning that the market value of our shares held by non-affiliates is less than $700 million and our annual revenue was less than $100 million during the most recently completed fiscal year. We may continue to be a smaller reporting company if either (i) the market value of our shares held by non-affiliates is less than $250 million or (ii) our annual revenue was less than $100 million during the most recently completed fiscal year and the market value of our shares held by non-affiliates is less than $700 million. As a smaller reporting company, we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Reports on Form 10-K, have reduced disclosure obligations regarding executive compensation and certain other matters, and smaller reporting companies are permitted to delay adoption of certain recent accounting pronouncements discussed in Note 2 to our financial statements in this Form 10-Q.

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Controlled Company Status

We are a majority-controlled subsidiary of Fortress. As a “Controlled Company” we rely on the exemption provided by Nasdaq Listing Rule 5615(c)(2), which permits us to maintain less than a majority of independent directors on our board.

Results of Operations

Comparison of the Three Months Ended September 30, 2024 and 2023


	For the three months ended September 30,				Change
($ in thousands)	2024		2023		$		%
Operating expenses:
Research and development	$	57	$	9,527	$	(9,470)	(99)	%
Gain on the sale of property and equipment		—		(1,351)		1,351	100	%
General and administrative		1,400		2,131		(731)	(34)	%
Total operating expenses		1,457		10,307		(8,850)	(86)	%
Loss from operations		(1,457)		(10,307)		8,850	(86)	%

Other income (expense)
Other income		—		138		(138)	(100)	%
Interest income		48		115		(67)	(58)	%
Interest expense		(1)		(4)		3	(75)	%
Total other income (expense)		47		249		(202)	(81)	%
Net Loss	$	(1,410)	$	(10,058)	$	8,648	(86)	%

Research and Development Expenses

Research and development expenses primarily consist of personnel related expenses, including salaries, benefits, travel, and other related expenses, stock-based compensation, payments made to third parties for license, sponsored research and milestone costs related to in-licensed products and technology, payments made to third party contract research organizations (“CROs”) for preclinical and clinical studies, investigative sites for clinical trials, consultants, the cost of acquiring and manufacturing clinical trial materials, costs associated with regulatory filings, laboratory costs and other supplies.

For the three months ended September 30, 2024 and 2023, research and development expenses were $57,000 and $9.5 million, respectively. The decrease of approximately $9.5 million is primarily attributed to decreased expenses of $1.6 million for personnel related costs, primarily driven by the reduction in workforce, $3.3 million for R&D other expense, primarily related to higher expenses in the third quarter of 2023 of approximately $1.5 million of expense incurred for uBriGene services and $1.5 million of expense for vector supply, $2.5 million for lab supplies, $1.0 million for program related expenses, which includes approximately $0.3 million savings on payables owed to clinical sites, $0.1 million for facility and deprecation expenses, and $0.9 million for consulting expenses.

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The following table provides a breakout of the components of research and development expenses for the three months ended September 30, 2024 and 2023:


	For the three months ended September 30,
($ in thousands)	2024		2023
R&D program related expenses ⁽¹⁾
MB-102	$	-	$	394
MB-106 ⁽²⁾		(468)		92
MB-107/207 ⁽³⁾		-		(389)
MB-109		72		356
MB-110		-		125
Mayo in situ CAR T		-		6
All others ⁽⁴⁾		14		30
Total R&D development expense		(382)		614
R&D personnel related expenses		191		1,826
R&D facility and depreciation expense		260		398
R&D consulting expenses		(88)		819
R&D lab supplies		(8)		2,520
R&D other expense ⁽⁵⁾		84		3,350
Total research and development expense	$	57	$	9,527

⁽¹⁾ Includes sponsored research, license and clinical trial related costs.

⁽²⁾ Credit for the three months ended September 30, 2024, primarily reflects the savings on the settlement of payables owed to clinical sites.

⁽³⁾ Credit for the three months ended September 30, 2023, reflects the refunds and credit memos received upon the termination services for the MB-107/207 program.

⁽⁴⁾ Includes costs for long-term follow-up and programs that were terminated.

⁽⁵⁾ Includes approximately $1.5 million of expense incurred for uBriGene services and $1.5 million of expense for vector supply in the third quarter of 2023.

Gain on the Sale of Property and Equipment

During the three months ended September 30, 2023, we recorded a gain on the sale of equipment of approximately $1.4 million in connection with the sale of assets to uBriGene. There were no sales of property and equipment during the three months ended September 30, 2024.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and related expenses, including stock-based compensation, for executives and other administrative personnel, recruitment expenses, professional fees and other corporate expenses, including investor relations and legal activities including patent fees.

For the three months ended September 30, 2024, and 2023, general and administrative expenses were $1.4 million and $2.1 million, respectively. The decrease of approximately $0.7 million is primarily attributed to a $0.4 million decrease in personnel costs, $0.2 million decrease in legal and patent protection expenses, and $0.1 million decrease in consulting.

Other Income or Expense

For the three months ended September 30, 2024, and 2023, other income was $47,000 and $0.2 million, respectively. The decrease of approximately $0.2 million in income is primarily attributed to a $0.1 million decrease in interest income, and $0.1 million decrease in other income.

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Comparison of the Nine Months Ended September 30, 2024 and 2023


	For the nine months ended September 30,				Change
($ in thousands)	2024		2023		$		%
Operating expenses:
Research and development	$	8,221	$	34,363	$	(26,142)	(76)	%
Asset impairment		2,649		—		2,649	100	%
Gain on the sale of property and equipment		—		(1,351)		1,351	100	%
General and administrative		4,358		7,507		(3,149)	(42)	%
Total operating expenses		15,228		40,519		(25,291)	(62)	%
Loss from operations		(15,228)		(40,519)		25,291	(62)	%

Other income (expense)
Other income		314		918		(604)	(66)	%
Interest income		118		727		(609)	(84)	%
Interest expense		(4)		(4,112)		4,108	(100)	%
Total other income (expense)		428		(2,467)		2,895	(117)	%
Net Loss	$	(14,800)	$	(42,986)	$	28,186	(66)	%

Research and Development Expenses

For the nine months ended September 30, 2024 and 2023, research and development expenses were $8.2 million and $34.4 million, respectively. The decrease of approximately $26.2 million is primarily attributed to decreased expenses of $12.5 million for personnel related costs, reflecting decreased headcount and includes the reversal of $1.3 million of 2023 accrued bonus that will not be paid due to the reduction in the workforce that occurred in April 2024, $7.4 million for lab supplies, $4.2 million for program related expenses, which includes approximately $0.6 million forgiveness of payables to St. Jude as a result of the mutual termination of the license agreement and $0.3 million forgiveness of payables to the Mayo Clinic as a result of the termination of the license agreement, $1.5 million for facility and deprecation expenses, and $2.1 million for consulting expenses, offset by approximately $1.5 million increase in other expenses, primarily related to approximately $3.2 million of expenses incurred related to the June 2024 Repurchase of Assets from uBriGene.

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The following table provides a breakout of the components of research and development expenses for the nine months ended September 30, 2024 and 2023:


	For the nine months ended September 30,
($ in thousands)	2024		2023
R&D program related expenses ⁽¹⁾
MB-102	$	(2)	$	505
MB-106		1,099		3,026
MB-107/207 ⁽²⁾		(562)		(862)
MB-109		476		945
MB-110		241		309
Mayo in situ CAR T		(294)		588
All others ⁽³⁾		21		648
Total R&D development expense		979		5,159
R&D personnel related expenses ⁽⁴⁾		(948)		11,541
R&D facility and depreciation expense		918		2,463
R&D consulting expenses		670		2,750
R&D lab supplies		175		7,573
R&D other expense ⁽⁵⁾		6,427		4,877
Total research and development expense	$	8,221	$	34,363

⁽¹⁾ Includes sponsored research, license and clinical trial related costs.

⁽²⁾ Credit for the nine months ended September 30, 2024, reflects the forgiveness of outstanding payables and accrued expenses due to the mutual termination of the license agreement and related data transfer agreement with St. Jude. Credit for the nine months ended September 30, 2023, reflects credit memos and reimbursements received from termination of services with vendors.

⁽³⁾ Includes costs for long-term follow-up and programs that were terminated.

⁽⁴⁾ Credit for the nine months ended September 30, 2024, primarily reflects the reversal of 2023 accrued bonus that will not be paid due to the reduction in the workforce in April 2024.

⁽⁵⁾ Includes approximately $3.2 million of expenses incurred related to the June 2024 Repurchase of Assets from uBriGene.

Asset Impairment

For the nine months ended September 30, 2024, we incurred impairment charges of $2.6 million attributable to our assessment of the recoverability of the asset group consisting of leasehold improvements and associated right-of-use asset. No impairment was recorded in the nine months ended September 30, 2023.

Gain on the Sale of Property and Equipment

During the nine months ended September 30, 2023, we recorded a gain on the sale of equipment of approximately $1.4 million in connection with the sale of assets to uBriGene. No gain on the sale of property and equipment was recorded in the nine months ended September 30, 2024.

General and Administrative Expenses

For the nine months ended September 30, 2024, and 2023, general and administrative expenses were $4.4 million and $7.5 million, respectively. The decrease of approximately $3.1 million is primarily attributed to a $1.3 million decrease in personnel costs, $1.2 million decrease in legal and patent protection expenses, $0.3 million decrease in consulting expenses, $0.1 million decrease in professional services. and a $0.4 million decrease across various other general and

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administrative expenses, offset by $0.2 million increase in the equity fee to Fortress, in connection with the financings and ATM activity.

Other Income or Expense

For the nine months ended September 30, 2024, and 2023, other income (expense) was $0.4 million and $(2.5) million, respectively. The increase of approximately $2.9 million in income is primarily attributed to a $4.1 million decrease in interest expense, related to the repayment of the Term Loan, partially offset by a $0.6 million decrease in other income and a $0.6 million decrease in interest income.

Liquidity and Capital Resources

We have incurred substantial operating losses and expect to continue to incur significant operating losses for the foreseeable future and may never become profitable. As of September 30, 2024, we had an accumulated deficit of $395.8 million.

We have funded our operations to date primarily through the sale of equity. For example, on May 2, 2024, we completed the May 2024 Offering and on June 21, 2024, we completed the June 2024 Offering (together the “Offerings”) described in “Financing Activities” above. The net proceeds of the Offerings, after deducting the fees and expenses of the placement agent and other offering expenses payable by us, but excluding the net proceeds from the exercise of the Warrants, were approximately $5.3 million. We intend to use the net proceeds from the Offering for working capital and general corporate purposes.

As of September 30, 2024, the Company had cash and cash equivalents of $3.5 million. On April 10, 2024, our Board approved a reduction in our workforce of approximately 81%, in order to reduce costs and preserve capital due to the fundraising environment and continued uncertainty regarding the CFIUS review of the sale of the Facility and the Transaction with uBriGene. The reduction occurred primarily in April 2024 and was completed in the second quarter. Additionally in April 2024, we terminated our license agreements with St. Jude and Leiden University Medical Centre. The mutual termination of the St. Jude license and associated Data Transfer Agreement included the forgiveness of outstanding amounts owed by us. In June 2024, we terminated our license agreement with the Mayo Clinic, which included the forgiveness of the outstanding amounts owed by us of approximately $0.3 million. In June 2024, we also terminated the sublease of the Mercantile Center Facility. Based on our current operating plan, reflecting these changes described above, we currently expect that such cash and cash equivalents, together with the approximately $1.4 million net proceeds received from the ATM and $3.6 million net proceeds from the exercise of warrants in October, as described above, will be sufficient to fund our operations through the first half of 2025. We will continue to seek additional funding through corporate partnerships and capital markets fundraising. See “Risk Factors—Risks Related to Our Finances and Capital Requirements.”

The continuation of our business as a going concern is dependent upon raising additional capital and eventually attaining and maintaining profitable operations. As of September 30, 2024, there is substantial doubt about our ability to continue as a going concern for the next 12 months from the date of issuance of these unaudited financial statements. The financial statements included in this Form 10-Q do not include any adjustments that might be necessary should operations discontinue.

In addition, the amount of proceeds we may be able to raise pursuant to our existing shelf registration statements on Form S-3 may be limited. As of the filing of this Form 10-Q, we are subject to General Instruction I.B.6 to Form S-3 known as the “baby shelf rules.” Under these instructions, the amount of funds we can raise through primary offerings of securities in any 12-month period using our registration statements on Form S-3 is limited to one-third of the aggregate market value of the shares of our common stock held by our non-affiliates. Therefore, we will be limited in the amount of proceeds we are able to raise by selling securities using our Form S-3 until such time as our public float exceeds $75 million.

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Contractual Obligations

We enter into contracts in the normal course of business with licensors, CROs, contract manufacturing organizations (CMOs) and other third parties for the procurement of various products and services, including without limitation biopharmaceutical development, biologic assay development, commercialization, clinical and preclinical development, clinical trials management, pharmacovigilance and manufacturing and supply. These contracts typically do not contain minimum purchase commitments and are generally terminable by us upon written notice. Payments due upon termination or cancelation/delay consist of payments for services provided or expenses incurred, including non-cancelable obligations of our service providers, up to the date of cancellation; in certain cases, our contractual arrangements with CROs and CMOs include cancelation and/or delay fees and penalties.

During the three and six months ended September 30, 2024, there were no material changes in our contractual obligations and commitments, as described in our 2023 Form 10-K. See above for recent terminations of our agreements with St. Jude and LUMC in April 2024 and the Mayo Clinic in June 2024.

Cash Flows for the Nine Months Ended September 30, 2024 and 2023


	For the nine months ended September 30,
($ in thousands)	2024		2023
Statement of cash flows data:
Total cash (used in) provided by:
Operating activities	$	(9,413)	$	(42,223)
Investing activities		—		5,916
Financing activities		6,329		(30,037)
Net change in cash, cash equivalents and restricted cash	$	(3,084)	$	(66,344)

Operating Activities

Net cash used in operating activities was $9.4 million for the nine months ended September 30, 2024, compared to $42.2 million for the nine months ended September 30, 2023.

Net cash used in operating activities for the nine months ended September 30, 2024, was primarily due to approximately $14.8 million in net loss, partially offset by $2.8 million of non-cash items, primarily related to the $2.6 million asset impairment charge, and a $2.6 million positive change in operating assets and liabilities.

Net cash used in operating activities for the nine months ended September 30, 2023, was primarily due to approximately $43.0 million in net loss and a $2.9 million negative change in operating assets and liabilities, offset in part by $3.6 million of non-cash items, which is primarily attributable to a $2.8 million loss on extinguishment of debt, $1.6 million of depreciation expense and $0.4 million of non-cash stock compensation expenses, offset in part by the $1.4 million gain on the sale of property and equipment to uBriGene.

Investing Activities

During the nine months ended September 30, 2024, no cash was used in or provided by investing activities. Net cash provided by investing activities was $5.9 million for the nine months ended September 30, 2023, primarily reflecting proceeds from the sale of property and equipment to uBriGene of $6.0 million.

Financing Activities

Net cash provided by financing activities was $6.3 million during the nine months ended September 30, 2024, primarily reflecting the proceeds from the May and June 2024 Offerings and the ATM.

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Net cash used in financing activities was $30.0 million during the nine months ended September 30, 2023, driven by the repayment of the Term Loan, partially offset by $0.2 million raised from the issuance of the Company’s common shares in connection with the ESPP, and $0.2 million of net proceeds from the Mustang ATM.

Item 3. Quantitative and Qualitative Disclosures About Market Risks

We are a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and are not required to provide the information under this item.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness, as of September 30, 2024, of the design and operation of our disclosure controls and procedures, as such term is defined in Exchange Act Rules 13a-15(e) and 15d-15(e). Based on this evaluation, our principal executive officer and principal financial officer have concluded that, as of such date, our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in our Exchange Act reports is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

No change in internal control over financial reporting occurred during the most recent quarter, with respect to our operations, which materially affected, or is reasonable likely to materially affect, our internal controls over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

None.

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Item 1A. Risk Factors

Investing in our common stock or any other type of equity or debt securities we may offer (together, our “Securities”) involves a high degree of risk. The following information sets forth risk factors that could cause our actual results to differ materially from those contained in forward-looking statements we have made in this Form 10-Q and those we may make from time to time. You should carefully consider the risks described below, in addition to the other information contained in this Form 10-Q, including our consolidated financial statements and the related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” before making an investment decision. Our business, financial condition or results of operations could be harmed by any of these risks. The risks and uncertainties described below are not the only ones we face. Additional risks not presently known to us or other factors not perceived by us to present significant risks to our business at this time also may impair our business operations. Some of the statements in the following risk factors constitute forward-looking statements. Please see the section titled “Special Note Regarding Forward-Looking Statements.”

Risks Related to Our Finances and Capital Requirements

We have incurred significant losses since our inception. We expect to incur losses for the foreseeable future and may never achieve or maintain profitability. We do not have any products that are approved for commercial sale and therefore do not expect to generate any revenues from product sales in the foreseeable future, if ever.

We have a limited operating history. We have focused primarily on organizing, acquiring and developing and securing our proprietary technology and identifying and obtaining preclinical data for various product candidates, with the goal of supporting regulatory approval for these product candidates. We have incurred losses since our inception in March 2015. Our net losses were $14.8 million and $43.0 million for the nine months ended September 30, 2024 and 2023, respectively, and we had an accumulated deficit of $395.8 million as of September 30, 2024. We expect to continue to incur significant operating losses for the foreseeable future. We also do not anticipate that we will achieve profitability for a period of time after generating material revenues, if ever. If we are unable to generate revenues, we will not become profitable and may be unable to continue operations without continued funding.

Because of the numerous risks and uncertainties associated with developing pharmaceutical products, we are unable to predict the timing or amount of increased expenses or when or if, we will be able to achieve profitability. Our net losses may fluctuate significantly from quarter to quarter and year to year. We anticipate that our expenses will increase substantially if:

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one or more of our product candidates receive regulatory approval and are approved for commercial sale, due to our need to establish the necessary commercial infrastructure to launch and commercialize this product candidate without substantial delays, including hiring sales and marketing personnel and contracting with third parties for manufacturing, testing, warehousing, distribution, cash collection and related commercial activities;

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we are required by the FDA or foreign regulatory authorities to perform studies in addition to those currently expected;

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there are any delays in completing our clinical trials or the development of any of our product candidates;

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we execute other collaborative, licensing or similar arrangements that require us to make payments to collaborators or licensors;

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there are variations in the level of expenses related to our future development programs;

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there are any product liability or intellectual property infringement lawsuits in which we may become involved; and

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there are any regulatory developments affecting product candidates of our competitors.

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Our ability to become profitable depends upon our ability to generate revenue. To date, we have not generated any revenue from our development stage products, and we do not know when, or if, we will generate any revenue. Our ability to generate revenue depends on a number of factors, including, but not limited to, our ability to:

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obtain regulatory approval for one or more of our product candidates, or any future product candidate that we may license or acquire;

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manufacture or have manufactured commercial quantities of one or more of our product candidates or any future product candidate, if approved, at acceptable cost levels; and

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develop a commercial organization and the supporting infrastructure required to successfully market and sell one or more of our product candidates or any future product candidate, if approved.

Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would depress the value of our Company and could impair our ability to raise capital, expand our business, maintain our research and development efforts, diversify our product offerings or even continue our operations. A decline in the value of our Company could also cause you to lose all or part of your investment in our Securities.

There is substantial doubt regarding our ability to continue as a going concern. We will need to raise additional funding (which may not be available on acceptable terms to us, or at all) and/or delay, limit or terminate our product development efforts or other operations. If we are unable to raise capital, we could be required to seek bankruptcy protection or other alternatives that would likely result in our securityholders losing some or all of their investment in us.

We are currently advancing our programs in hematologic cancers and solid tumors through clinical development. Developing and commercializing CAR T products is expensive, and we do not expect to generate meaningful product revenues in the foreseeable future until we obtain marketing approval for products in the United States and following any potential commercial launch.

As of September 30, 2024, our cash and cash equivalents were $3.5 million. Based on our current business plan, there is substantial doubt regarding our ability to continue as a going concern for a period of one year after the date that our financial statements for the year ended September 30, 2024, are issued. Our fundraising efforts to raise additional funding may divert our management from their day-to-day activities, which may adversely affect our ability to develop and commercialize our potential products following marketing approval if and when obtained. In addition, we cannot guarantee that financing will be available in sufficient amounts or on terms acceptable to us, if at all. Moreover, the terms of any financing may adversely affect the holdings or the rights of our stockholders and the issuance of additional securities, whether equity or debt, by us, or the possibility of such issuance, may cause the market price of our shares to decline. The sale of additional equity or convertible securities would dilute all of our stockholders. Potential indebtedness, if incurred, would result in increased fixed payment obligations, and we may be required to agree to certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire, sell or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. We could also be required to seek funds through arrangements with collaborative partners or otherwise at an earlier stage than otherwise would be desirable and we may be required to relinquish rights to some of our technologies or product candidates or otherwise agree to terms unfavorable to us, any of which may have a material adverse effect on our business, operating results and prospects.

In addition, in order to address our current funding constraints, we may be required to further revise our business plan and strategy, which may result in us (i) further curtailing, delaying or discontinuing one or more of our research or development programs or the commercialization of any product candidates, (ii) selling certain of our assets and/or (iii) may result in our being unable to expand our operations or otherwise capitalize on our business opportunities. Such actions may become necessary whether or not we are able to raise additional capital. As a result, our business, financial condition, and results of operations could be materially affected. Furthermore, if we are unable to raise capital, we could be required to seek

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bankruptcy protection or other alternatives that would likely result in our securityholders losing some or all of their investment in us.

Our short operating history makes it difficult to evaluate our business and prospects.

We have been conducting operations only since our incorporation in March 2015. Our operations to date have been limited. We have not yet demonstrated an ability to successfully complete clinical trials, obtain regulatory approvals, manufacture a clinical scale or commercial scale product, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities necessary for successful product commercialization. Consequently, any predictions about our future performance may not be as accurate as they could be if we had a history of successfully developing and commercializing pharmaceutical products.

In addition, as a young business, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors. We will need to expand our capabilities to support commercial activities. We may not be successful in adding such capabilities.

We expect our financial condition and operating results to continue to fluctuate significantly from quarter to quarter and year to year due to a variety of factors, many of which are beyond our control. Accordingly, you should not rely upon the results of any past quarterly period as an indication of future operating performance.

We will require substantial additional funding which may not be available to us on acceptable terms, or at all. If we fail to raise the necessary additional capital, we may be unable to complete the development and commercialization of our product candidates or continue our development programs.

Our operations have consumed substantial amounts of cash since inception. We will need to significantly increase our spending to advance the preclinical and clinical development of our product candidates and launch and commercialize any product candidates for which we may receive regulatory approval, including building our own commercial organizations to address certain markets. We will require substantial additional capital for the further development and, if approved, commercialization of our product candidates, as well as to fund our other operating expenses and capital expenditures. As of September 30, 2024, we had $3.9 million in cash and restricted cash and have not generated positive cash flows from operations. We cannot provide any assurance that we will be able to raise funds to complete the development of our product candidates. Additionally, if we are unable to secure additional funding, it is likely that we will need to delay or terminate the development of certain product candidates; any such delay or termination, or the announcement of any such delay or termination, may impact our potential growth and have a material adverse effect on the value of our Securities.

In order to carry out our business plan and implement our strategy, we will need to obtain substantial additional financing and may choose to raise additional funds through strategic collaborations, licensing arrangements, public or private equity or debt financing, bank lines of credit, asset sales, government grants, or other arrangements. We cannot be certain that additional funding will be available on acceptable terms, or at all. Additional funding may be more difficult to obtain, or may be more expensive, as a result of recent increases in inflation and interest rates in the U.S. economy generally. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or, if approved, commercialization of one or more of our product candidates. We may also seek collaborators for one or more of our current or future product candidates at an earlier stage than otherwise would be desirable or on terms that are less favorable than might otherwise be available. Any of these events could significantly harm our business, financial condition and prospects.

Our future funding requirements will depend on many factors, including, but not limited to:

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the scope, timing, design and conduct of, and results from, preclinical studies and clinical trials for our product candidates;

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the potential for delays in our efforts to seek regulatory approval for our product candidates, and any costs associated with such delays;

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the costs of establishing a commercial organization to sell, market and distribute our product candidates;

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the rate of progress and costs of our efforts to prepare for the submission of a New Drug Application (“NDA”) or Biologics License Application (“BLA”) for any product candidates that we may in-license or acquire in the future, and the potential that we may need to conduct additional clinical trials to support applications for regulatory approval;

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the costs of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights associated with our product candidates, including any such costs we may be required to expend if our licensors are unwilling or unable to do so;

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the cost and timing of securing sufficient supplies of our product candidates from our contract manufacturers for clinical trials and in preparation for commercialization;

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the effect of competing technological and market developments;

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the terms and timing of any collaborative, licensing, co-promotion or other arrangements that we may establish;

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if one or more of our product candidates are approved, the potential that we may be required to file a lawsuit to defend our patent rights or regulatory exclusivities from challenges by companies seeking to market generic versions of one or more of our product candidates;

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the success of the commercialization of one or more of our product candidates, if approved;

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the costs and timing of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending any intellectual property-related claims; and

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macroeconomic factors such as inflationary pressures, rising interest rates, liquidity constraints, failures and instability in U.S. and international financial banking systems, supply disruptions due to political unrest, conflict and war or other factors, and pandemics.

Under current SEC regulations, if at the time we file our Annual Report on Form 10-K our public float is less than $75 million, and for so long as our public float remains less than $75 million, the amount we can raise through primary public offerings of securities in any twelve-month period using shelf registration statements is limited to an aggregate of one-third of our public float, which is referred to as the “baby shelf rules.” SEC regulations permit us to use the highest closing sales price of our common stock (or the average of the last bid and last ask prices of our common stock) on any day within 60 days of sales under the registration statement to calculate our public float.

As of the date of the 2023 Form 10-K, our public float was less than $75 million. As a result, for sales following the date of the 2023 Form 10-K, and until we again have a public float with a value in excess of $75 million, if ever, we only have the capacity to sell shares up to one-third of our public float under shelf registration statements in any twelve-month period. If our public float decreases, the amount of securities we may sell under our Form S-3 shelf registration statements will also decrease.

Our inability to raise capital when needed would harm our business, financial condition and results of operations, and could cause our stock value to decline or require that we wind down our operations altogether.

Raising additional capital, including through lending arrangements, may cause dilution to our existing stockholders, restrict our operations or require us to relinquish proprietary rights.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt financings, grants and license and development agreements in connection with any collaborations. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a stockholder. Debt financing, including through lending arrangements, and preferred equity

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financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends.

If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

We will continue to incur significant increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

As a public company, we incur significant legal, accounting and other expenses under the Sarbanes-Oxley Act of 2002, (the “Sarbanes-Oxley Act”), as well as rules subsequently implemented by the SEC, and the rules of the Nasdaq Stock Exchange. These rules impose various requirements on public companies, including requiring establishment and maintenance of effective disclosure and financial controls and appropriate corporate governance practices. Our management and other personnel have devoted and will continue to devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations increase our legal and financial compliance costs and make some activities more time-consuming and costly. For example, these rules and regulations make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. As a result, it may be more difficult for us to attract and retain qualified persons to serve on our Board, our Board committees or as executive officers.

The Sarbanes-Oxley Act requires, among other things, that we maintain effective internal controls for financial reporting and disclosure controls and procedures. As a result, we are required to periodically perform an evaluation of our internal controls over financial reporting to allow management to report on the effectiveness of those controls, as required by Section 404 of the Sarbanes-Oxley Act. These efforts to comply with Section 404 and related regulations have required, and continue to require, the commitment of significant financial and managerial resources. While we anticipate maintaining the integrity of our internal controls over financial reporting and all other aspects of Section 404, we cannot be certain that a material weakness will not be identified when we test the effectiveness of our control systems in the future. If a material weakness is identified, we could be subject to sanctions or investigations by the SEC or other regulatory authorities, which would require additional financial and management resources, costly litigation or a loss of public confidence in our internal controls, which could have an adverse effect on the market price of our stock.

We are a "smaller reporting company," and the reduced disclosure requirements applicable to smaller reporting companies may make our common stock less attractive to investors.

We are a smaller reporting company, and we will remain a smaller reporting company until the fiscal year following the determination that our voting and non-voting common shares held by non-affiliates is more than $250 million measured on the last business day of our second fiscal quarter, or our annual revenues are more than $100 million during the most recently completed fiscal year and our voting and non-voting common shares held by non-affiliates is more than $700 million measured on the last business day of our second fiscal quarter. Smaller reporting companies are able to provide simplified executive compensation disclosure, are exempt from the auditor attestation requirements of Section 404, and have certain other reduced disclosure obligations, including, among other things, being required to provide only two years of audited financial statements and not being required to provide selected financial data, supplemental financial information or risk factors.

We have elected to take advantage of certain of the reduced reporting obligations available to us. We cannot predict whether investors will find our common stock less attractive if we rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be reduced or more volatile.

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Our ability to use our pre-change NOLs and other pre-change tax attributes to offset post-change taxable income or taxes may be subject to limitation.

We may, from time to time, carry net operating loss carryforwards (“NOLs”) as deferred tax assets on our balance sheet. Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change” (generally defined as a greater than 50-percentage- point cumulative change (by value) in the equity ownership of certain stockholders over a rolling three-year period), the corporation’s ability to use its pre-change NOLs and other pre-change tax attributes to offset its post-change taxable income or taxes may be limited. We may experience ownership changes in the future as a result of shifts in our stock ownership, some of which changes are outside our control. As a result, our ability to use our pre-change NOLs and other pre-change tax attributes to offset post-change taxable income or taxes may be subject to limitation.

Risks Related to Our Business Strategy, Structure, and Organization

We currently have no products for sale. We are heavily dependent on the success of our product candidates, and we cannot give any assurances that any of our product candidates will receive regulatory approval or be successfully commercialized.

To date, we have invested a significant portion of our efforts and financial resources in the acquisition and development of our product candidates. We have not demonstrated our ability to perform the functions necessary for the successful acquisition, development or commercialization of the technologies we are seeking to develop. As an early stage company, we have limited experience and have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. Our future success is substantially dependent on our ability to successfully develop, obtain regulatory approval for, and then commercialize such product candidates. Most of our product candidates are currently in early stage clinical trials. Our business depends entirely on the successful development and commercialization of our product candidates, which may never occur. We currently have no drug products for sale, currently generate no revenues from sales of any drug products and may never be able to develop or commercialize a marketable product.

The successful development, and any commercialization, of our technologies and any product candidates that may occur would require us to successfully perform a variety of functions, including:

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developing our technology platform;

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identifying, developing, formulating, manufacturing and, if approved, commercializing product candidates;

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entering into successful licensing and other arrangements with product development partners;

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participating in regulatory approval processes, including ultimately gaining approval to market a drug product, which may not occur;

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obtaining sufficient quantities of our product candidates from our third-party manufacturers to meet clinical trial needs and, if approved, to meet commercial demand at launch and thereafter;

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establishing and maintaining agreements with wholesalers, distributors and group purchasing organizations on commercially reasonable terms;

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conducting sales and marketing activities including hiring, training, deploying and supporting our sales force and creating market demand for our product candidates through our own marketing and sales activities, and any other arrangements to promote our product candidates that we may establish;

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maintaining patent protection and regulatory exclusivity for our product candidates; and

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raising additional required capital on acceptable terms.

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Our operations have historically been limited to organizing the Company, acquiring, developing and securing our proprietary technology and identifying and obtaining preclinical data or clinical data for various product candidates. These operations provide a limited basis for you to assess our ability to continue to develop our technology, identify product candidates, develop and commercialize any product candidates we are able to identify and enter into successful collaborative arrangements with other companies, as well as for you to assess the advisability of investing in our securities. Each of these requirements will require substantial time, effort and financial resources.

Each of our product candidates will require additional clinical development, management of clinical and manufacturing activities, regulatory approval in the jurisdictions in which we plan to market the product, obtaining manufacturing supply, building a commercial organization, and significant marketing efforts before we generate any revenues from product sales, which may not occur. We are not permitted to market or promote any of our product candidates in the U.S. or any other jurisdiction before we receive regulatory approval from the FDA or comparable foreign regulatory authority, respectively, and we may never receive such regulatory approval for any of our product candidates.

Our approach to the development of our product candidates is unproven, and we do not know whether we will be able to develop any products of commercial value.

Our product candidates are emerging technologies and, consequently, it is conceivable that such technologies may ultimately fail to develop into commercially viable therapies to treat human patients with cancer or other diseases. One of the reasons for the lack of commercial viability could be our inability to obtain regulatory approval for such technologies.

CAR T is a new approach to cancer treatment that presents significant challenges.

We have concentrated much of our research and development efforts on CAR T technology, and our future success is highly dependent on the successful development of T cell immunotherapies in general and our CAR T technology and product candidates in particular. Because CAR T is a relatively new approach to cancer immunotherapy and cancer treatment generally, developing and commercializing our product candidates subjects us to a number of challenges, including, but not necessarily limited to:

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obtaining regulatory approval from the FDA and other regulatory authorities that may have very limited experience with the commercial development of genetically modified T cell therapies for cancer;

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developing and deploying consistent and reliable processes for engineering a patient’s T cells ex vivo and infusing the engineered T cells back into the patient;

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conditioning patients with chemotherapy in conjunction with delivering each of our products, which may increase the risk of adverse side effects of our product candidates;

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educating medical personnel regarding the potential side effect profile of each of our product candidates;

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developing processes for the safe administration of these product candidates, including long-term follow-up for all patients who receive our product candidates;

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sourcing clinical and, if approved, commercial supplies for the materials used to manufacture and process our product candidates;

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developing a manufacturing process and distribution network with a cost of goods that allows for an attractive return on investment;

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establishing sales and marketing capabilities after obtaining any regulatory approval to gain market acceptance, and obtaining adequate coverage, reimbursement and pricing by third-party payors and government authorities; and

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developing therapies for types of cancers beyond those addressed by our current product candidates.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.

Because we have limited financial and managerial resources, we focus on research programs and product candidates that we identify for specific indications. As a result, we may forego or delay the pursuit of opportunities with other product candidates or for other indications that later prove to have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any commercially viable products. If we do not accurately and/or effectively evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate.

Risks Inherent in Drug Development and Commercialization

Delays in the commencement or conduct of our clinical trials could result in increased costs and delay our ability to pursue regulatory approval.

Clinical trials are expensive and can take many years to complete, and the outcome is inherently uncertain. We cannot guarantee that any clinical trials will be conducted as planned or will be completed on schedule, if at all. A failure of one or more clinical trials can occur at any stage and our future clinical trials may not be successful. The commencement or conduct of clinical trials can be delayed for a variety of reasons, including, but not necessarily limited to, delays in:

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commencing a clinical trial, as a result of regulatory authority action;

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identifying, recruiting and training suitable clinical investigators;

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reaching and preserving agreements on acceptable terms with prospective clinical research organizations (“CROs”) and trial sites, the terms of which can be subject to extensive negotiation, may be subject to modification from time to time and may vary significantly among different CROs and trial sites;

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obtaining sufficient quantities of a product candidate for use in clinical trials;

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obtaining Institutional Review Board (“IRB”) or ethics committee approval to conduct a clinical trial at a prospective site;

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developing and validating companion diagnostics on a timely basis, if required;

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adding new clinical sites once a trial has begun;

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change in the principal investigator or other key staff overseeing the clinical trial at a given site;

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identifying, recruiting and enrolling patients to participate in a clinical trial; or

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retaining (or replacing) patients who have initiated a clinical trial but who may withdraw due to adverse events from the therapy, insufficient efficacy, fatigue with the clinical trial process, personal issues, or other reasons.

Any delays in the commencement of our clinical trials will delay our ability to pursue regulatory approval for product candidates. In addition, many of the factors that cause, or lead to, a delay in the commencement of clinical trials may also ultimately lead to the denial of regulatory approval of a product candidate.

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Suspensions or delays in the completion of clinical testing could result in increased costs and delay or prevent our ability to complete development of that product candidate or generate product revenues, if approved.

Once a clinical trial has begun, patient recruitment and enrollment may be slower than we anticipate due to the nature of the clinical trial plan, the proximity of patients to clinical sites, the eligibility criteria for participation in the study or other factors. Clinical trials may also be delayed as a result of ambiguous or negative interim results or difficulties in obtaining sufficient quantities of product manufactured in accordance with regulatory requirements and on a timely basis. Further, a clinical trial may be modified, suspended or terminated by us, an IRB, an ethics committee or a data safety monitoring committee overseeing the clinical trial, any clinical trial site with respect to that site, or the FDA or other regulatory authorities, due to a number of factors, including, but not necessarily limited to:

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failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols;

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inspection of the clinical trial operations or clinical trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold;

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stopping rules contained in the protocol;

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unforeseen safety issues or any determination that the clinical trial presents unacceptable health risks; and

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lack of adequate funding to continue the clinical trial.

Changes in regulatory requirements and guidance also may occur, and we may need to amend clinical trial protocols to reflect these changes. Amendments may require us to resubmit clinical trial protocols to IRBs for re-examination, which may in turn impact the costs and timing of, and the likelihood of successfully completing, a clinical trial. If we experience delays in the completion of, or if we must suspend or terminate, any clinical trial of any product candidate, our ability to obtain regulatory approval for that product candidate will be delayed, and the commercial prospects, if any, for the product candidate may suffer as a result. In addition, many of these factors may also ultimately lead to the denial of regulatory approval of a product candidate.

Product candidates that we advance into clinical trials may not receive regulatory approval.

Pharmaceutical development has inherent risks. We will be required to demonstrate through well-controlled clinical trials that product candidates are effective with a favorable benefit-risk profile for use in their target indications before seeking regulatory approvals for their commercial sale. Success in early clinical trials does not mean that later clinical trials will be successful, as product candidates in later-stage clinical trials may fail to demonstrate sufficient safety or efficacy despite having progressed through initial clinical testing. Also, we may need to conduct additional clinical trials that are not currently anticipated. Companies frequently suffer significant setbacks in advanced clinical trials, even after earlier clinical trials have shown promising results. As a result, product candidates that we advance into clinical trials may not receive regulatory approval.

In addition, even if our product candidates were to obtain approval, regulatory authorities may approve any such product candidates or any future product candidate for fewer or more limited indications than we request, may not approve the price we intend to charge for our products, may grant approval contingent on the performance of costly post-marketing clinical trials, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. The regulatory authority may also require the label to contain warnings, contraindications, or precautions that limit the commercialization of the product. Any of these scenarios could impact the commercial prospects for one or more of our current or future product candidates.

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Any product candidates we advance into clinical development are subject to extensive regulation, which can be costly and time consuming, cause unanticipated delays or prevent the receipt of the required approvals to commercialize product candidates.

The research and clinical development, testing, manufacturing, labeling, storage, record-keeping, advertising, promotion, import, export, marketing and distribution of any product candidate, including our product candidates, is subject to extensive regulation by the FDA in the United States and by comparable health authorities in foreign markets. In the United States, we are not permitted to market a product candidate until such product candidate’s BLA or NDA is approved by the FDA. The process of obtaining approval is uncertain, expensive, often spanning many years, and can vary substantially based upon the type, complexity and novelty of the products involved. In addition to significant and expensive clinical testing requirements, our ability to obtain marketing approval for product candidates depends on obtaining the final results of required non-clinical testing, including characterization of the manufactured components of our product candidates and validation of our manufacturing processes. The FDA may determine that our product manufacturing processes, testing procedures or equipment and facilities are inadequate to support approval. Approval policies or regulations may change, and the FDA has substantial discretion in the pharmaceutical approval process, including the ability to delay, limit or deny approval of a product candidate for many reasons. Despite the time and expense invested in the clinical development of product candidates, regulatory approval is never guaranteed.

The FDA and other regulatory agencies can delay, limit or deny approval of a product candidate for many reasons, including, but not limited to:

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the FDA or comparable foreign regulatory authorities may disagree with the trial design or implementation of our clinical trials, including proper use of clinical trial methods and methods of data analysis;

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an inability to establish sufficient data and information to demonstrate to the satisfaction of the FDA that a product candidate is safe and effective for an indication;

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the FDA may not accept clinical data from trials conducted by individual investigators or in countries where the standard of care is potentially different from that of the United States;

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the results of clinical trials may not meet the level of statistical significance required by the FDA for approval;

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the FDA may disagree with the interpretation of data from preclinical studies or clinical trials;

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the FDA may determine that our manufacturing processes or facilities or those of third-party manufacturers with which we or our respective collaborators currently contract for clinical supplies and plan to contract for commercial supplies do not satisfactorily comply with cGMPs; or

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the approval policies or interpretation of regulations of the FDA may significantly change in a manner rendering the clinical data insufficient for approval or the product characteristics or benefit-risk profile unfavorable for approval.

With respect to foreign markets, approval procedures vary among countries and, in addition to the aforementioned risks, can involve additional product testing, administrative review periods and agreements with pricing authorities. In addition, rapid drug and biological development during the COVID-19 pandemic has raised questions about the safety and efficacy of certain marketed pharmaceuticals and may result in increased cautiousness by the FDA and comparable foreign regulatory authorities in reviewing new pharmaceuticals based on safety, efficacy or other regulatory considerations and may result in significant delays in obtaining regulatory approvals. Any delay in obtaining, or inability to obtain, applicable regulatory approvals would prevent us from commercializing our product candidates.

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Regulatory approval for our product candidates by the FDA, or any similar regulatory authorities outside the United States, is limited to those specific indications and conditions for which clinical safety and efficacy have been demonstrated.

Any regulatory approval is limited to the indications for use and related treatment of those specific diseases and indications set forth in the approval for which a product is deemed to be safe and effective by the FDA, or other similar regulatory authorities outside the United States. In addition to the regulatory approval required for new drug products, new formulations or indications for an approved product also require regulatory approval. If we are not able to obtain regulatory approval for any desired future indications for our products, our ability to effectively market and sell our products may be reduced and our business may be adversely affected.

While physicians may choose to prescribe drugs for uses that are not described in the product’s labeling and for uses that differ from those tested in clinical studies and approved by the regulatory authorities (“off-label uses”), our ability to promote the products is limited to those indications that are specifically approved by the FDA, or similar regulatory authorities outside the United States. Such off-label uses are common across medical specialties and may constitute an appropriate treatment for some patients in certain circumstances. Regulatory authorities in the U.S. generally do not regulate practice of medicine or the behavior of physicians in their choice of treatments. Regulatory authorities do, however, restrict communications by pharmaceutical companies on the promotion of off-label use. If our promotional activities fail to comply with these regulations or guidelines, we may be subject to compliance or enforcement actions, including Warning Letters, by these authorities. In addition, our failure to follow FDA laws, regulations and guidelines relating to promotion and advertising may cause the FDA to suspend or withdraw an approved product from the market, request a recall or institute fines or penalties, or could result in disgorgement of money, operating restrictions, corrective advertising, injunctions or criminal prosecution, any of which could harm our business.

If any of our product candidates are approved and we or our contract manufacturer(s) fail to produce the product, or components of the product, in the volumes that we require on a timely basis, or fail to comply with stringent regulations applicable to pharmaceutical drug manufacturers, we may face delays in the commercialization of our product candidates, if approved, or be unable to meet market demand, and may lose potential revenues.

The manufacture of pharmaceutical products requires significant expertise and capital investment, including the development of advanced manufacturing techniques and process controls, and the use of specialized processing equipment. We may enter into development and supply agreements with contract manufacturers for the completion of pre-commercialization manufacturing development activities and, if approved, the manufacture of commercial supplies for one or more of our product candidates. Any termination or disruption of our relationships with our contract manufacturers may materially harm our business and financial condition and frustrate any commercialization efforts for each respective product candidate.

All of our contract manufacturers must comply with strictly enforced federal, state and foreign regulations, including cGMP requirements enforced by the FDA through its establishment inspection program. We are required by law to establish adequate oversight and control over raw materials, components and finished products furnished by our third-party suppliers and contract manufacturers, but we have little control over their compliance with these regulations. Any failure to comply with applicable regulations may result in fines and civil penalties, suspension of production, restrictions on imports and exports, suspension or delay in product approval, product seizure or recall, or withdrawal of product approval, and would limit the availability of our product and customer confidence in our product. Any manufacturing defect or error discovered after products have been produced and distributed could result in even more significant consequences, including costly recalls, re-stocking costs, damage to our reputation and potential for product liability claims.

If the contract manufacturers upon whom we may rely to manufacture one or more of our product candidates, and any future product candidate we may in-license, fails to deliver the required commercial quantities on a timely basis at commercially reasonable prices, we would likely be unable to meet demand for our approved product and we would lose potential revenues.

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If serious adverse or unacceptable side effects are identified during the development of one or more of our product candidates or any future product candidate, we may need to abandon or limit the development of some of our product candidates.

If one or more of our product candidates or any future product candidate are associated with undesirable side effects or adverse events in clinical trials or have characteristics that are unexpected, we may need to abandon their development or limit development to more narrow uses or subpopulations in which the adverse events, undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective. In our industry, many compounds that initially showed promise in early stage testing have later been found to cause serious adverse events that prevented further development of the compound. In the event that our clinical trials reveal a high or unacceptable severity and prevalence of adverse events, our trials could be suspended or terminated, and the FDA or comparable foreign regulatory authorities could order us to cease further development or deny approval of one or more of our product candidates or any future product candidate for any or all targeted indications. The FDA could also issue a letter requesting additional data or information prior to making a final decision regarding whether or not to approve a product candidate. The number of requests for additional data or information issued by the FDA in recent years has increased and has resulted in substantial delays in the approval of several new drugs. Adverse events or undesirable side effects caused by one or more of our product candidates or any future product candidate could also result in the inclusion of unfavorable information in our product labeling or in denial of regulatory approval by the FDA or other regulatory authorities for any or all targeted indications, which would, in turn, prevent us from commercializing and generating market acceptance and revenues from the sale of that product candidate. Adverse events or side effects could affect patient recruitment or the ability of enrolled patients to complete the trial and could result in potential product liability claims.

Additionally, if one or more of our product candidates or any future product candidate receives marketing approval and we or others later identify undesirable side effects caused by this product, a number of potentially significant negative consequences could result, including:

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regulatory authorities may require the addition of unfavorable labeling statements, including specific warnings, black box warnings, adverse reactions, precautions, and/or contraindications;

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regulatory authorities may suspend or withdraw their approval of the product, and/or require it to be removed from the market;

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we may be required to recall a product, be required to change the way the product is administered, conduct additional clinical trials or change the labeling of the product; or

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our reputation may suffer.

Any of these events could prevent us from achieving or maintaining market acceptance of any of our product candidates or any future product candidate or could substantially increase our commercialization costs and expenses, which in turn could delay or prevent us from generating significant revenues, or any revenues, from their sale.

Even if one or more of our product candidates receives regulatory approval, it and any other products we may market will remain subject to substantial regulatory scrutiny.

If one or more of our product candidates that we may license or acquire is approved, the approved product candidate will be subject to ongoing requirements and review by the FDA and other regulatory authorities. These requirements include labeling, packaging, storage, advertising, promotion, record-keeping and submission of safety and other post-market information and reports, registration and listing requirements, cGMP requirements relating to manufacturing, quality control, quality assurance and corresponding maintenance of records and documents, requirements regarding the distribution of samples to physicians and recordkeeping of the drug, and requirements regarding our presentations to and interactions with health care professionals.

The FDA, or other regulatory authorities, may also impose requirements for costly post-marketing studies or clinical trials and surveillance to monitor the safety or efficacy of the product. The FDA and other applicable regulatory authorities

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closely regulates the post-approval marketing and promotion of drugs to ensure drugs are marketed only for the approved indications and in accordance with the provisions of the approved labeling. The FDA and other applicable regulatory authorities impose stringent restrictions on manufacturers’ communications regarding off-label use and if we do not market any approved product for only their approved indications, we may be subject to enforcement action for off-label marketing. Violations of the Federal Food Drug and Cosmetics Act (“FDCA”) relating to the promotion of prescription drugs may lead to investigations, civil claims, and/or criminal charges alleging violations of federal and state health care fraud and abuse laws, as well as state consumer protection laws.

In addition, later discovery of previously unknown adverse events or other problems with our products, manufacturers or manufacturing processes, or failure to comply with regulatory requirements, may yield various results, including:

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restrictions on such products, operations, manufacturers or manufacturing processes;

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restrictions on the labeling or marketing of a product;

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restrictions on product distribution or use;

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requirements to conduct post-marketing studies or clinical trials;

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warning letters, untitled letters, Form 483s, import alerts, and/or inspection observations;

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withdrawal of the products from the market;

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refusal to approve pending applications or supplements to approved applications that we submit;

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recall of products;

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fines, restitution or disgorgement of profits;

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suspension or withdrawal of marketing or regulatory approvals;

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suspension of any ongoing clinical trials;

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refusal to permit the import or export of our products;

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product seizure; or

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injunctions, consent decrees, and/or the imposition of civil or criminal penalties.

The FDA’s policies may change, and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates, or negatively affect those products for which we may have already received regulatory approval, if any. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may be subject to the various actions listed above, including losing any marketing approval that we may have obtained.

We will need to obtain FDA approval of any proposed product brand names, and any failure or delay associated with such approval may adversely impact our business.

A pharmaceutical product cannot be marketed in the U.S. or other countries until we have completed a rigorous and extensive regulatory review process, including approval of a brand name. Any brand names we intend to use for our product candidates will require approval from the FDA regardless of whether we have secured a formal trademark registration from the USPTO. The FDA typically conducts a review of proposed product brand names, including an evaluation of the potential for confusion with other product names. The FDA may also object to a product brand name if it believes the name inappropriately implies medical claims. If the FDA objects to any of our proposed product brand names, we may be required to adopt an alternative brand name for our product candidates. If we adopt an alternative brand

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name, we would lose the benefit of our existing trademark applications for such product candidate and may be required to expend significant additional resources in an effort to identify a suitable product brand name that would qualify under applicable trademark laws, not infringe the existing rights of third parties and be acceptable to the FDA. We may be unable to build a successful brand identity for a new trademark in a timely manner or at all, which would limit our ability to commercialize our product candidates.

Public concern regarding the safety of drug products could delay or limit our ability to obtain regulatory approval, result in the inclusion of unfavorable information in our labeling or require us to undertake other activities that may entail additional costs.

In light of widely publicized events concerning the safety risk of certain drug products, the FDA, members of the U.S. Congress, the Government Accountability Office, medical professionals and the general public have raised concerns about potential drug safety issues. These events have resulted in the withdrawal of drug products, revisions to drug labeling that further limit use of the drug products and the establishment of risk management programs. The Food and Drug Administration Amendments Act of 2007 (“FDAAA”), grants significant expanded authority to the FDA, much of which is aimed at improving the safety of drug products before and after approval. In particular, the new law authorizes the FDA to, among other things, require post-approval studies and clinical trials, mandate changes to drug labeling to reflect new safety information and require risk evaluation and mitigation strategies for certain drugs, including certain currently approved drugs. It also significantly expands the federal government’s clinical trial registry and results databank, which we expect will result in significantly increased government oversight of clinical trials. Under the FDAAA, companies that violate these and other provisions of the new law are subject to substantial civil monetary penalties, among other regulatory, civil and criminal penalties. The increased attention to drug safety issues may result in a more cautious approach by the FDA in its review of data from our clinical trials. Data from clinical trials may receive greater scrutiny, particularly with respect to safety, which may make the FDA or other regulatory authorities more likely to require additional preclinical studies or clinical trials. If the FDA requires us to conduct additional preclinical studies or clinical trials prior to approving any of our product candidates, our ability to obtain approval of this product candidate will be delayed. If the FDA requires us to provide additional clinical or preclinical data following the approval of any of our product candidates, the indications for which this product candidate is approved may be limited or there may be specific warnings or limitations on dosing, and our efforts to commercialize our product candidates may be otherwise adversely impacted.

If we experience delays or difficulties in the enrollment of patients in clinical trials, our receipt of necessary regulatory approvals could be delayed or prevented.

We may not be able to initiate or continue clinical trials for one or more of our product candidates if we are unable to locate and enroll a sufficient number of eligible patients to participate in these trials as required by the FDA or similar regulatory authorities outside the United States. Some of our competitors have ongoing clinical trials for product candidates that treat the same indications that we are targeting for our product candidates, and patients who would otherwise be eligible for our clinical trials may instead enroll in clinical trials of our competitors’ product candidates. Available therapies for the indications we are pursuing can also affect enrollment in our clinical trials. Patient enrollment is affected by other factors including, but not necessarily limited to:

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the severity of the disease under investigation;

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the eligibility criteria for the study in question;

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the perceived risks and benefits of the product candidate under study;

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the efforts to facilitate timely enrollment in clinical trials;

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the patient referral practices of physicians;

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the number of clinical trials sponsored by other companies for the same patient population;

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the ability to monitor patients adequately during and after treatment; and

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the proximity and availability of clinical trial sites for prospective patients.

Our inability to enroll a sufficient number of patients for our clinical trials would result in significant delays and could require us to abandon one or more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs for our product candidates or future product candidates, which would cause the value of our Company to decline and limit our ability to obtain additional financing.

If our competitors develop treatments for any of our product candidates’ target indications and those competitor products are approved more quickly, marketed more successfully or demonstrated to be more effective, the commercial opportunity for our product candidate will be reduced or eliminated.

The biotechnology and pharmaceutical industries are subject to rapid and intense technological change. We face, and will continue to face, competition in the development and, if approved, marketing of our product candidates from academic institutions, government agencies, research institutions and biotechnology and pharmaceutical companies. There can be no assurance that developments by others will not render one or more of our product candidates obsolete or noncompetitive. Furthermore, new developments, including the development of other drug technologies and methods of preventing the incidence of disease, occur in the pharmaceutical industry at a rapid pace. These developments may render one or more of our product candidates obsolete or noncompetitive.

Competitors may seek to develop alternative formulations that do not directly infringe on our in-licensed patent rights. The commercial opportunity for one or more of our product candidates could be significantly harmed if competitors are able to develop alternative formulations outside the scope of our in-licensed patents. Compared to us, many of our potential competitors have substantially greater:

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capital resources;

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development resources, including personnel and technology;

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clinical trial experience;

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regulatory experience;

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expertise in prosecution of intellectual property rights; and

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manufacturing, distribution and sales and marketing experience.

As a result of these factors, our competitors may obtain regulatory approval of their products more rapidly than we are able to or may obtain patent protection or other intellectual property rights that limit our ability to develop or commercialize one or more of our product candidates. Our competitors may also develop drugs that are more effective, safe, useful and less costly than ours and may be more successful than us in manufacturing and marketing their products. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. We will also face competition from these third parties in establishing clinical trial sites, in patient registration for clinical trials, and in identifying and in-licensing new product candidates.

Further, generic therapies are typically sold at lower prices than branded therapies and are generally preferred by hospital formularies and managed care providers of health services. We anticipate that, if approved, our product candidates will face increasing competition in the form of generic versions of branded products of competitors, including those that have lost or will lose their patent exclusivity. In the future, we may face additional competition from a generic form of our own candidates when the patents covering them begin to expire, or earlier if the patents are successfully challenged. If we are unable to demonstrate to physicians and payers that the key differentiating features of our product candidates translate to overall clinical benefit or lower cost of care, we may not be able to compete with generic alternatives.

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If any of our product candidates are successfully developed but, if approved, do not achieve broad market acceptance among physicians, patients, healthcare payors and the medical community, the revenues that any such product candidates generate from sales will be limited.

Even if our product candidates receive regulatory approval, they may not gain market acceptance among physicians, patients, healthcare payors and the medical community. Coverage and reimbursement of our product candidates by third-party payors, including government payors, generally would also be necessary for commercial success. The degree of market acceptance of any approved products would depend on a number of factors, including, but not necessarily limited to:

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the efficacy and safety as demonstrated in clinical trials;

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the timing of market introduction of such approved product as well as competitive products;

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the clinical indications for which the product is approved;

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acceptance by physicians, major operators of cancer clinics and patients of the product as a safe and effective treatment;

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the safety of such product candidates seen in a broader patient group, (i.e., based on actual use);

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the availability, cost and potential advantages of alternative treatments, including less expensive generic drugs;

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the availability of adequate reimbursement and pricing by third-party payors and government authorities;

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changes in regulatory requirements by government authorities for our product candidates;

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the relative convenience and ease of administration of the product candidate for clinical practices;

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the product labeling or product insert required by the FDA or regulatory authority in other countries, including any contradictions, warnings, drug interactions, or other precautions;

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changes in the standard of care for the targeted indications for our product candidate or future product candidates, which could reduce the marketing impact of any labeling or marketing claims that we could make following FDA approval;

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the approval, availability, market acceptance and reimbursement for a companion diagnostic, if any;

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the prevalence and severity of adverse side effects; and

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the effectiveness of our sales and marketing efforts.

If any product candidate that we develop does not provide a treatment regimen that is as beneficial as, or is not perceived as being as beneficial as, the current standard of care or otherwise does not provide patient benefit, that product candidate, if approved for commercial sale by the FDA or other regulatory authorities, likely will not achieve market acceptance. Our ability to effectively promote and sell any approved products will also depend on pricing and cost-effectiveness, including our ability to produce a product at a competitive price and our ability to obtain sufficient third-party coverage or reimbursement. If any product candidate is approved but does not achieve an adequate level of acceptance by physicians, patients and third-party payors, our ability to generate revenues from that product would be substantially reduced. In addition, our efforts to educate the medical community and third-party payors on the benefits of our product candidates may require significant resources, may be constrained by FDA rules and policies on product promotion, and may never be successful.

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Reimbursement may be limited or unavailable in certain market segments for our product candidates, which could make it difficult for us to sell our products profitably.

There is significant uncertainty related to the third-party coverage and reimbursement of newly approved drugs. Such third-party payors include government health programs such as Medicare, managed care providers, private health insurers and other organizations. We intend to seek approval to market our product candidates in the U.S., the European Union (“EU”) and other selected foreign jurisdictions. Market acceptance and sales of our product candidates in both domestic and international markets will depend significantly on the availability of adequate coverage and reimbursement from third-party payors for any of our product candidates and may be affected by existing and future health care reform measures. Government and other third-party payors are increasingly attempting to contain healthcare costs by limiting both coverage and the level of reimbursement for new drugs and, as a result, they may not cover or provide adequate payment for our product candidates, if approved. These payors may conclude that our product candidates are less safe, less effective or less cost-effective than existing or future introduced products, and third-party payors may not approve our product candidates, if approved, for coverage and reimbursement or may cease providing coverage and reimbursement for these product candidates.

Obtaining coverage and reimbursement approval for a product from a government or other third-party payor is a time consuming and costly process that could require us to provide to the payor supporting scientific, clinical and cost-effectiveness data for the use of our products. We may not be able to provide data sufficient to gain acceptance with respect to coverage and reimbursement. If reimbursement of our future products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

In some foreign countries, particularly in the EU, the pricing of prescription pharmaceuticals is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product candidate. To obtain reimbursement or pricing approval in some countries, we may be required to conduct additional clinical trials that compare the cost-effectiveness of our product candidates to other available therapies. If reimbursement of our product candidates, if approved, is unavailable or limited in scope or amount in a particular country, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability of our products in such a country.

If we are unable to establish sales, marketing and distribution capabilities or to enter into agreements with third parties to market and sell our product candidates, we may be unsuccessful in commercializing our product candidates, if they are approved.

We currently do not have a marketing or sales organization for the marketing, sales and distribution of pharmaceutical products. In order to commercialize any approved product candidate, we would need to build marketing, sales, distribution, managerial and other non-technical capabilities or arrange for third parties to perform these services, and we may be unsuccessful in doing so. In the event of successful development and regulatory approval of any of our current or future product candidates, we expect to build a targeted specialist sales force to market or co-promote the product. There are risks involved with establishing our own sales, marketing and distribution capabilities. For example, recruiting and training a sales force is expensive and time consuming and could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales force and establish marketing capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses. This may be costly, and our investment would be lost if we cannot retain or reposition our sales and marketing personnel.

Factors that may inhibit our efforts to commercialize our product candidates, if approved, on our own include, but are not necessarily limited to:

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our inability to recruit, train and retain adequate numbers of effective sales and marketing personnel;

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the inability of sales personnel to obtain access to physicians or persuade adequate numbers of physicians to prescribe any future products;

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the lack of complementary or other products to be offered by sales personnel, which may put us at a competitive disadvantage from the perspective of sales efficiency relative to companies with more extensive product lines; and

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unforeseen costs and expenses associated with creating our own sales and marketing organization.

We face potential product liability exposure, and if successful claims are brought against us, we may incur substantial liability for one or more of our product candidates or a future product candidate, if approved, we may license or acquire and may have to limit their commercialization.

The use of one or more of our product candidates and any future product candidate we may license or acquire in clinical trials and the sale of any products for which we obtain marketing approval expose us to the risk of product liability claims. For example, we may be sued if any product candidate we develop allegedly causes injury or is found to be otherwise unsuitable during clinical testing, manufacturing, and, if approved, during marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Product liability claims might be brought against us by consumers, health care providers or others using, administering or selling our products. If we cannot successfully defend ourselves against these claims, we will incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:

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withdrawal of clinical trial participants;

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suspension or termination of clinical trial sites or entire trial programs;

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decreased demand for any product candidates or products that we may develop;

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initiation of investigations by regulators;

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impairment of our business reputation;

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costs of related litigation;

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substantial monetary awards to patients or other claimants;

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loss of revenues;

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reduced resources of our management to pursue our business strategy; and

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the inability to commercialize our product candidate or future product candidates, if approved.

We will obtain limited product liability insurance coverage for any and all of our upcoming clinical trials. However, our insurance coverage may not reimburse us or may not be sufficient to reimburse us for any expenses or losses we may suffer. Moreover, insurance coverage is becoming increasingly expensive, and, in the future, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability. When needed we intend to expand our insurance coverage to include the sale of commercial products if we obtain marketing approval for one or more of our product candidates in development, but we may be unable to obtain commercially reasonable product liability insurance for any products approved for marketing. On occasion, large judgments have been awarded in class action lawsuits based on drugs that had unanticipated side effects. A successful product liability claim or series of claims brought against us could cause our stock price to fall and, if judgments exceed our insurance coverage, could decrease our cash and adversely affect our business.

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Product candidates, even if successfully developed and commercialized, may be effective only in combating certain specific types of cancer, and the market for drugs designed to combat such cancer type(s) may be small and unprofitable.

There are many different types of cancer, and a treatment that is effective against one type of cancer may not be effective against another. CAR T or other technologies we pursue may only be effective in combating specific types of cancer but not others. Even if one or more of our product candidates, if approved, proves to be an effective treatment against a given type of cancer, the number of patients suffering from such cancer may be small, in which case potential sales from a therapy designed to combat such cancer would be limited.

Negative public opinion and increased regulatory scrutiny of the therapies that underpin many of our product candidates may damage public perception of our product candidates or adversely affect our ability to conduct our business or obtain regulatory approvals for our product candidates.

Public perception may be influenced by claims that one or more of the therapies underpinning our product candidates is unsafe, and such therapy may not gain the acceptance of the public or the medical community. More restrictive government regulations or negative public opinion would have a negative effect on our business or financial condition and may delay or impair the development and commercialization of our product candidates or demand for any products we may develop. Adverse events in our clinical trials, even if not ultimately attributable to our product candidates, and the resulting publicity, could lead to increased governmental regulation, unfavorable public perception, potential regulatory delays in the testing or approval of our potential product candidates, stricter labeling requirements for those product candidates that do obtain approval and/or a decrease in demand for any such product candidates. Concern about environmental spread of our products, whether real or anticipated, may also hinder the commercialization of our products.

Risks Related to Reliance on Third Parties

We rely on our licensors to conduct some of our preclinical studies and some of our clinical trials for our product candidates and for future product candidates, and we rely on third-party CROs and site management organizations to conduct most of the remainder of our preclinical studies and all the rest of our clinical trials. We expect to continue to rely on third parties, such as our licensors, CROs, site management organizations, clinical data management organizations, medical institutions and clinical investigators, to conduct some of our preclinical studies and all of our clinical trials. The agreements with these third parties might terminate for a variety of reasons, including a failure to perform by the third parties. If we need to enter into alternative arrangements, that could delay our product development activities.

Our reliance on these third parties for research and development activities reduces our control over these activities but does not relieve us of our responsibilities. For example, we remain responsible for ensuring that each of our preclinical studies and clinical trials is conducted in accordance with the general investigational plan and protocols for the trial and for ensuring that our preclinical studies are conducted in accordance with good laboratory practices (“GLPs”) as appropriate. Moreover, the FDA requires us to comply with standards, commonly referred to as good clinical practices (“GCPs”) for conducting, recording and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the rights, integrity and confidentiality of trial participants are protected. Regulatory authorities enforce these requirements through periodic inspections of trial sponsors, clinical investigators and trial sites. If we or any of our CROs fail to comply with applicable GCPs, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that upon inspection by a regulatory authority, such regulatory authority will determine that any of our clinical trials complies with GCP regulations. In addition, our clinical trials must be conducted with product produced under cGMP regulations. Our failure to comply with these regulations may require us to repeat clinical trials, which would delay the regulatory approval process. We also are required to register certain clinical trials and post the results of completed clinical trials on a government-sponsored database,

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ClinicalTrials.gov, within specified timeframes. Failure to do so can result in fines, adverse publicity and civil and criminal sanctions.

The third parties with whom we have contracted to help perform our preclinical studies and/or clinical trials may also have relationships with other entities, some of which may be our competitors. If these third parties do not successfully carry out their contractual duties, meet expected deadlines or conduct our preclinical studies or clinical trials in accordance with regulatory requirements or our stated protocols, we will not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates and will not be able to, or may be delayed in our efforts to, successfully commercialize our product candidates, if approved.

If any of our relationships with these third-party CROs or site management organizations terminates, we may not be able to enter into arrangements with alternative CROs or site management organizations or to do so on commercially reasonable terms. Switching or adding additional CROs or site management organizations involves additional cost and requires management time and focus. In addition, there is a natural transition period when a new CRO or site management organization commences work. As a result, delays could occur, which could compromise our ability to meet our desired development timelines.

We are currently reliant on COH, Fred Hutch, and UAB for a substantial portion of our research and development efforts and the early clinical testing of our product candidates.

A substantial portion of our research and development has been and will continue to be conducted by COH, Fred Hutch, and UAB, pursuant to a sponsored research agreement and/or clinical trial agreements with each of those parties. As a result, our future success is heavily dependent on the results of research and development efforts of these institutions and their personnel. We have limited control over the nature or timing of their research and limited visibility into their day-to-day activities, and as a result can provide little assurance that their efforts will be successful.

We contract with third parties for the manufacture of our product candidates for preclinical and clinical testing and may also do so for commercialization, if and when our product candidates are approved. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or any future product candidate or such quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.

Due to limited resources, and in light of our reduction in work force in April 2024, we may increase our reliance on third-party manufacturers or third-party collaborators for the manufacture of commercial supply of one or more product candidates for which our collaborators or we obtain marketing approval. We may be unable to establish any agreements with third-party manufacturers or to do so on acceptable terms. Even if we are able to establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including, but not necessarily limited to:


	·	reliance on the third party for regulatory compliance and quality assurance, while still being required by law to establish adequate oversight and control over products furnished by that third party;


	·	the possible breach of the manufacturing agreement by the third party;


	·	manufacturing delays if our third-party manufacturers are unable to obtain raw materials due to supply chain disruptions, give greater priority to the supply of other products over our product candidates or otherwise do not satisfactorily perform according to the terms of the agreement between us;


	·	the possible misappropriation of our proprietary information, including our trade secrets and know-how; and


	·	the possible termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us.

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We rely on our third-party manufacturers to produce or purchase from third-party suppliers the materials and equipment necessary to produce our product candidates for our preclinical and clinical trials. Forces beyond our control could disrupt the global supply chain and impact our or our third-party manufacturers’ ability to obtain raw materials or other products necessary to manufacture our product candidates. There are a limited number of suppliers for raw materials and equipment that we use (or that are used on our behalf) to manufacture our product candidates, and there may be a need to assess alternate suppliers to prevent a possible disruption of the manufacture of the materials and equipment necessary to produce our product candidates for our preclinical and clinical trials, and if approved, ultimately for commercial sale. We do not have any control over the process or timing of the acquisition of these raw materials or equipment by our third-party manufacturers. Any significant delay in the supply of a product candidate, or the raw material components thereof, for an ongoing preclinical or clinical trial due to the need to replace a third-party manufacturer could considerably delay completion of our preclinical or clinical trials, product testing and potential regulatory approval of our product candidates. If our manufacturers or we are unable to purchase these raw materials or equipment after regulatory approval has been obtained for our product candidates, the commercial launch of our product candidates would be delayed or there would be a shortage in supply, which would impair our ability to generate revenues from the sale of our product candidates.

The facilities used by contract manufacturers to potentially manufacture our product candidates must be approved by the FDA pursuant to inspections that will be conducted after we submit an New Drug Application (NDA) or BLA to the FDA. We are required by law to establish adequate oversight and control over raw materials, components and finished products furnished by our contract manufacturers, but we do not control the day-to-day manufacturing operations of, and are dependent on, the contract manufacturers for compliance with current Good Manufacturing Practices (“cGMP”) regulations for manufacture of our product candidates. Third-party manufacturers may not be able to comply with the cGMP regulations or similar regulatory requirements outside the United States. Our failure, or the failure of our third-party manufacturers, to comply with applicable regulations could result in sanctions being imposed on us, including clinical holds, fines, injunctions, restrictions on imports and exports, civil penalties, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of product candidates or products, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect supplies of our products.

One or more of the product candidates that we may develop may compete with other product candidates and products for access to manufacturing facilities. There are a limited number of manufacturers that operate under cGMP regulations and that might be capable of manufacturing for us. Any performance failure on the part of our existing or future manufacturers could delay clinical development or marketing approval. We do not currently have arrangements in place for redundant supply. If our current contract manufacturers cannot perform as agreed, we may be required to replace such manufacturers. We may incur added costs and delays in identifying and qualifying any replacement manufacturers.

Future dependence upon others for the manufacture of our product candidates or products may adversely affect our future profit margins and our ability to commercialize any products that may receive marketing approval on a timely and competitive basis. We also expect to rely on third parties to distribute drug supplies for our clinical trials. Any performance failure on the part of our distributors could delay clinical development or marketing approval of our product candidates or commercialization of our products, if approved, producing additional losses and depriving us of potential product revenue.

We rely on third parties to conduct all aspects of our LV vector production and these third parties may not perform satisfactorily.

We do not independently conduct our LV vector production and we currently rely, and expect to continue to rely, on third parties with respect to the manufacture of these items.

Our reliance on these third parties for manufacturing LV vector reduces our control over these activities but will not relieve us of our responsibility to ensure compliance with all required regulations and study protocols. For products that we develop and, if approved, commercialize, we will remain responsible for ensuring that each of our IND-enabling studies and clinical studies is conducted in accordance with the study plan and protocols, and that our LV vectors are manufactured in accordance with GMP as applied in the relevant jurisdictions.

If these third parties do not successfully carry out their contractual duties, meet expected deadlines, conduct our studies in accordance with regulatory requirements or our stated study plans and protocols, or manufacture our LV vectors in

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accordance with GMP, we will not be able to complete, or may be delayed in completing, the preclinical and clinical studies and manufacturing process validation activities required to support future IND, market authorization application and BLA submissions and approval of our product candidates, or to support commercialization of our products, if approved. Many of our agreements with these third parties contain termination provisions that allow these third parties to terminate their relationships with us at any time. If we need to enter into alternative arrangements, our product development and commercialization activities could be delayed.

We may be forced to enter into an agreement with a different manufacturer, which we may not be able to do on reasonable terms, if at all. In some cases, the technical skills required to manufacture LV vector for our drug product candidates may be unique or proprietary to the original manufacturer, and we may have difficulty or there may be contractual restrictions prohibiting us from, transferring such skills to a back-up or alternate supplier, or we may be unable to transfer such skills at all. Any of these events could lead to clinical study delays or failure to obtain marketing approval or impact our ability to successfully commercialize our product candidates or any future product candidates, if approved. Some of these events could be the basis for FDA action, including injunction, recall, seizure or total or partial suspension of production.

We rely on clinical data and results obtained by third parties that could ultimately prove to be inaccurate or unreliable.

As part of our strategy to mitigate development risk, we seek to develop product candidates with well-studied mechanisms of action, and we utilize biomarkers to assess potential clinical efficacy early in the development process. This strategy necessarily relies upon clinical data and other results obtained by third parties that may ultimately prove to be inaccurate or unreliable. Further, such clinical data and results may be based on products or product candidates that are significantly different from our product candidates or any future product candidate. If the third-party data and results we rely upon prove to be inaccurate, unreliable or not applicable to our product candidates or future product candidate, we could make inaccurate assumptions and conclusions about our product candidates and our research and development efforts could be compromised.

We may need to license certain intellectual property from third parties, and such licenses may not be available or may not be available on commercially reasonable terms.

A third party may hold intellectual property, including patent rights that are important or necessary to the development and commercialization of our products. It may be necessary for us to use the patented or proprietary technology of third parties, who may or may not be interested in granting such a license, to commercialize our products, in which case we would be required to obtain a license from these third parties on commercially reasonable terms, or our business could be harmed, possibly materially.

Collaborative relationships with third parties could cause us to expend significant resources and incur substantial business risk with no assurance of financial return.

Establishing strategic collaborations is difficult and time-consuming. Our discussions with potential collaborators may not lead to the establishment of collaborations on favorable terms, if at all. Potential collaborators may reject collaborations based upon their assessment of our financial, regulatory or intellectual property position. In addition, there has been a significant number of recent business combinations among large pharmaceutical companies that have resulted in a reduced number of potential future collaborators. Even if we successfully establish new collaborations, these relationships may never result in the successful development or commercialization of product candidates or the generation of sales revenue. To the extent that we enter into collaborative arrangements, the related product revenues are likely to be lower than if we directly marketed and sold products. Such collaborators may also consider alternative product candidates or technologies for similar indications that may be available to collaborate on and whether such a collaboration could be more attractive than the one with us for any future product candidate.

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Risks Relating to Legislation and Regulation Affecting the Biopharmaceutical and Other Industries

We are subject to new legislation, regulatory proposals and managed care initiatives that may increase our costs of compliance and adversely affect our ability to market our products, obtain collaborators and raise capital.

In the United States and certain foreign jurisdictions, there have been, and we expect there will continue to be, a number of legislative and regulatory changes to the healthcare system that could prevent or delay marketing approval of our product candidate, restrict or regulate post-approval activities, and affect our ability to profitably sell any product candidates for which we obtain marketing approval. The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010 (the “PPACA” or collectively, the “ACA”), substantially regulates the way healthcare is financed by both governmental and private insurers in the United States. Among other things, the ACA increased the minimum level of Medicaid rebates payable by manufacturers of brand name drugs from 15.1% to 23.1%; required collection of rebates for drugs paid by Medicaid managed care organizations; imposed a non-deductible annual fee on pharmaceutical manufacturers or importers who sell certain “branded prescription drugs” to specified federal government programs; implemented a new methodology under which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled, infused, instilled, implanted, or injected; expanded the eligibility criteria for Medicaid programs; created a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with funding for such research; and established a Center for Medicare and Medicaid Innovation (“CMMI”) at the CMS, to test innovative payment and service delivery models to lower Medicare and Medicaid spending, potentially including prescription drug spending.

Since its enactment, there have been executive, judicial, and Congressional challenges to certain aspects of the ACA, and we expect there will be additional challenges and amendments to the ACA in the future. Drug pricing continues to be a subject of debate at the executive and legislative levels of U.S. government. The American Rescue Plan Act of 2021 signed into law by President Biden on March 14, 2021, includes a provision that eliminated the statutory cap on rebates drug manufacturers pay to Medicaid beginning in January 2024. With the elimination of the rebate cap, manufacturers may be required to compensate states in an amount greater than what the state Medicaid programs pay for the drug. Additionally, the Inflation Reduction Act of 2022 contains substantial drug pricing reforms, including the establishment of a drug price negotiation program within the U.S. Department of Health and Human Services that would require manufacturers to charge a negotiated “maximum fair price” for certain selected drugs or pay an excise tax for noncompliance, the establishment of rebate payment requirements on manufacturers of certain drugs payable under Medicare Parts B and D to penalize price increases that outpace inflation, and requires manufacturers to provide discounts on Part D drugs. Substantial penalties can be assessed for noncompliance with the drug pricing provisions in the Inflation Reduction Act of 2022. The Inflation Reduction Act of 2022 could have the effect of reducing the prices we can charge and reimbursement we receive for our product candidates, if approved, thereby reducing our profitability, and could have a material adverse effect on our financial condition, results of operations, and growth prospects. The effect of the Inflation Reduction Act of 2022 on our business and the pharmaceutical industry in general is not yet known.

At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

We expect that additional federal, state, and foreign healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in limited coverage and reimbursement and reduced demand for our products, once approved, or additional pricing pressures.

These and other healthcare reform measures that may be adopted in the future may result in more rigorous coverage criteria and in additional downward pressure on the price that we receive for any current or future product candidates. Any reduction in reimbursement from Medicare or other government healthcare programs may result in a similar reduction in payments from private payors. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our product candidates, if approved. Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and

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promotional activities for drugs. We cannot be sure whether additional legislative changes will be enacted, or whether the FDA regulations, guidance, or interpretations will be changed, or what the impact of such changes on the marketing approvals of any current or future product candidates, if any, may be. In addition, increased Congressional scrutiny of the FDA’s approval process may significantly delay or prevent marketing approval, as well as subject us to more stringent product labeling and post-marketing testing and other requirements.

Changes in funding for the FDA and other government agencies could hinder their ability to hire and retain key leadership and other personnel, or otherwise prevent new products and services from being developed or commercialized in a timely manner, which could negatively impact our business or the business of our partners.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability to hire and retain key personnel, ability to accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the agency have fluctuated in recent years as a result. In addition, government funding of other government agencies that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary government agencies, which would adversely affect our business or the business of our partners. The U.S. government has shut down several times in the past, and certain regulatory agencies, such as the FDA, have had to furlough nonessential FDA employees and stop routine activities. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business. If the timing of FDA’s review and approval of new products is delayed, the timing of our or our partners’ development process may be delayed, which could result in delayed milestone revenues and materially harm our operations or business.

Our current and future relationships with customers and third-party payors in the United States and elsewhere may be subject, directly or indirectly, to applicable anti-kickback, fraud and abuse, false claims, transparency, health information privacy and security and other healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm, administrative burdens and diminished profits and future earnings.

Healthcare providers, physicians and third-party payors in the U.S. and elsewhere will play a primary role in the recommendation and prescription of any product candidates for which we obtain marketing approval. Our future arrangements with third-party payors and customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations, including, without limitation, the federal Anti-Kickback Statute and the federal False Claims Act, which may constrain the business or financial arrangements and relationships through which we sell, market and distribute any product candidates for which we obtain marketing approval. In addition, we may be subject to transparency laws and patient privacy regulation by the federal and state governments and by governments in foreign jurisdictions in which we conduct our business. The applicable federal, state and foreign healthcare laws and regulations that may affect our ability to operate include, but are not necessarily limited to:

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The federal Anti-Kickback Statute, which prohibits, among other things, persons from knowingly and willfully soliciting, receiving offering or paying remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, either (1) the referral of an individual to a person for, furnishing any item or service for which payment is available under a federal health care program, or (2) the purchase, lease, order or recommendation thereof of any good, facility, service or item for which payment is available under a federal healthcare program;

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The False Claims Act and civil monetary penalty laws, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, false or fraudulent claims for payment from the federal government or making or using, or causing to be made or used, a false record or statement material to a false or fraudulent claim;

The federal Health Insurance Portability and Accountability Act of 1996 (“HIPAA”) which created new federal criminal statutes that prohibit executing a scheme to defraud any healthcare benefit program, obtaining money or

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property of the health care benefit program through false representations or knowingly and willingly falsifying, concealing or covering up a material fact, making false statements or using or making any false or fraudulent document in connection with the delivery of, or payment for, health care benefits or services;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act (“HITECH”), and its implementing regulations, which imposes certain requirements relating to the privacy, security and transmission of individually identifiable health information;

The provision under the Affordable Care Act (“ACA”) commonly referred to as the Sunshine Act, which requires applicable manufacturers of covered drugs, devices, biologics and medical supplies to track and annually report to CMS payments and other transfers of value provided to physicians and teaching hospitals and certain ownership and investment interests held by physicians or their immediate family members in applicable manufacturers and group purchasing organizations; applicable manufacturers are also required to report such information regarding payments and transfers of value provided, as well as ownership and investment interests held, to physician assistants, nurse practitioners, clinical nurse specialists, certified nurse anesthetists, and certified nurse-midwives;

The Foreign Corrupt Practices Act (“FCPA”) generally prohibits offering, promising, giving, or authorizing others to give anything of value, either directly or indirectly, to a non-U.S. government official in order to influence official action, or otherwise obtain or retain business. The FCPA also requires public companies to make and keep books and records that accurately and fairly reflect the transactions of the corporation and to devise and maintain an adequate system of internal accounting controls. Additionally, in many other countries, the health care providers who prescribe pharmaceuticals are employed by their government, and the purchasers of pharmaceuticals are government entities; therefore, our dealings with these prescribers and purchasers are subject to regulation under the FCPA; and

State law equivalents of each of the above federal laws, such as the Anti-Kickback Statute and False Claims Act, and state laws concerning security and privacy of health care information, which may differ in substance and application from state-to-state thereby complicating compliance efforts.

Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations may involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, including, without limitation, damages, fines, imprisonment, exclusion from participation in government healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations, which could have a material adverse effect on our business. If any of the physicians or other healthcare providers or entities with whom we expect to do business, including our collaborators, is found not to be in compliance with applicable laws, it may be subject to criminal, civil or administrative sanctions, including exclusions from participation in government healthcare programs, which could also materially affect our business.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could harm our business.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of hazardous and flammable materials, including chemicals and biological materials. Our operations also produce hazardous waste products. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. Although we believe that the safety procedures for handling and disposing of these materials comply with the standards prescribed by these laws and regulations, we cannot eliminate the risk of accidental contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable for any resulting damages,

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and any liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties for failure to comply with such laws and regulations.

Although we maintain workers’ compensation insurance to cover us for costs and expenses, we may incur due to injuries to our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials.

In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or future laws and regulations may impair our research, development or production efforts. Our failure to comply with these laws and regulations also may result in substantial fines, penalties or other sanctions.

Risks Related to Intellectual Property and Potential Disputes Thereof

If we are unable to obtain and maintain sufficient patent protection for our technology and products, our competitors could develop and commercialize technology and products similar or identical to ours, and our ability to successfully commercialize our technology and products may be impaired.

Our success depends, in large part, on our ability to obtain patent protection for product candidates and their formulations and uses. The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we or our partners will be successful in obtaining patents or what the scope of an issued patent may ultimately be. These risks and uncertainties include, but are not necessarily limited to, the following:

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patent applications may not result in any patents being issued, or the scope of issued patents may not extend to competitive product candidates and their formulations and uses developed or produced by others;

●our competitors, many of which have substantially greater resources than us or our partners, and many of which have made significant investments in competing technologies, may seek, or may already have obtained, patents that may limit or interfere with our abilities to make, use, and sell potential product candidates, file new patent applications, or may affect any pending patent applications that we may have;

●there may be significant pressure on the U.S. government and other international governmental bodies to limit the scope of patent protection both inside and outside the United States for disease treatments that prove successful as a matter of public policy regarding worldwide health concerns; and

●countries other than the United States may have patent laws less favorable to patentees than those upheld by U.S. courts, allowing foreign competitors a better opportunity to create, develop and market competing products.

In addition, patents that may be issued or in-licensed may be challenged, invalidated, modified, revoked, circumvented, found to be unenforceable, or otherwise may not provide any competitive advantage. Moreover, we may be subject to a third-party pre-issuance submission of prior art to the USPTO, or become involved in opposition, derivation, reexamination, inter partes review, post-grant review or interference proceedings challenging our patent rights or the patent rights of others. The costs of these proceedings could be substantial, and it is possible that our efforts to establish priority of invention would be unsuccessful, resulting in a material adverse effect on our U.S. patent positions. An adverse determination in any such submission, patent office trial, proceeding or litigation could reduce the scope of, render unenforceable, or invalidate, our patent rights, allow third parties to commercialize our technologies or products and compete directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third-party patent rights. In addition, if the breadth or strength of protection provided by our patents and patent applications is threatened, it could dissuade companies from collaborating with us to license, develop or commercialize current or future product candidates. Third parties are often responsible for maintaining patent protection for our product candidates, at our and their expense. If that party fails to appropriately prosecute and maintain patent protection for a product candidate, our abilities to develop and commercialize products may be adversely affected, and we may not be able to prevent competitors from making, using and selling competing products. Such a failure to properly protect intellectual property rights relating to any of our product candidates could have a material adverse effect on our

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financial condition and results of operations. In addition, U.S. patent laws may change, which could prevent or limit us from filing patent applications or patent claims to protect products and/or technologies or limit the exclusivity periods that are available to patent holders, as well as affect the validity, enforceability, or scope of issued patents.

We and our licensors also rely on trade secrets and proprietary know-how to protect product candidates. Although we have taken steps to protect our and their trade secrets and unpatented know-how, including entering into confidentiality and non-use agreements with third parties, and proprietary information and invention assignment agreements with employees, consultants and advisers, third parties may still come upon this same or similar information independently. Despite these efforts, any of these parties may also breach the agreements and may unintentionally or willfully disclose our or our licensors’ proprietary information, including our trade secrets, and we may not be able to identify such breaches or obtain adequate remedies. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult, expensive and time-consuming, and the outcome is unpredictable. In addition, some courts inside and outside the United States are less willing or unwilling to protect trade secrets. Moreover, if any of our or our licensors’ trade secrets were to be lawfully obtained or independently developed by a competitor, we and our licensors would have no right to prevent them, or those to whom they communicate it, from using that technology or information to compete with us. If any of our or our licensors’ trade secrets were to be disclosed to or independently developed by a competitor, our competitive positions would be harmed.

The patent prosecution process is expensive and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify any patentable aspects of our research and development output and methodology, and, even if we do, an opportunity to obtain patent protection may have passed. Given the uncertain and time-consuming process of filing patent applications and prosecuting them, it is possible that our product(s) or process(es) originally covered by the scope of the patent application may have changed or been modified, leaving our product(s) or process(es) without patent protection. If our licensors or we fail to obtain or maintain patent protection or trade secret protection for one or more product candidates or any future product candidate we may license or acquire, third parties may be able to leverage our proprietary information and products without risk of infringement, which could impair our ability to compete in the market and adversely affect our ability to generate revenues and achieve profitability. Moreover, should we enter into other collaborations we may be required to consult with or cede control to collaborators regarding the prosecution, maintenance and enforcement of licensed patents. Therefore, these patents and applications may not be prosecuted and enforced in a manner consistent with the best interests of our business.

The patent position of biotechnology and pharmaceutical companies generally is highly uncertain, involves complex legal and factual questions and has in recent years been the subject of much litigation. In addition, no consistent policy regarding the breadth of claims allowed in pharmaceutical or biotechnology patents has emerged to date in the U.S. The patent situation outside the U.S. is even more uncertain. The laws of foreign countries may not protect our rights to the same extent as the laws of the U.S., and we may fail to seek or obtain patent protection in all major markets. For example, European patent law restricts the patentability of methods of treatment of the human body more than U.S. law does. Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the U.S. and other jurisdictions are typically not published until 18 months after a first filing, or in some cases not at all. Therefore, we cannot know with certainty whether we or our licensors were the first to make the inventions claimed in patents or pending patent applications that we own or licensed, or that we or our licensors were the first to file for patent protection of such inventions. In the event that a third party has also filed a U.S. patent application relating to our product candidates or a similar invention, depending upon the priority dates claimed by the competing parties, we may have to participate in interference proceedings declared by the USPTO to determine priority of invention in the U.S. We might also become involved in derivation proceedings in an event that a third party misappropriates one or more of our inventions and files their own patent application directed to such one or more inventions. The costs of these proceedings could be substantial, and it is possible that our efforts to establish priority of invention (or that a third party derived an invention from us) would be unsuccessful, resulting in a material adverse effect on our U.S. patent position. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights are highly uncertain. Our pending and future patent applications may not result in patents being issued which protect our technology or products, in whole or in part, or which effectively prevent others from commercializing competitive technologies and products. Changes in either the patent laws or interpretation of the patent laws in the U.S. and other countries may diminish the value of our patents or narrow the scope of our patent protection. For example, the federal courts of the U.S. have taken an increasingly dim view of the

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patent eligibility of certain subject matter, such as naturally occurring nucleic acid sequences, amino acid sequences and certain methods of utilizing the same, which include their detection in a biological sample and diagnostic conclusions arising from their detection. Such subject matter, which had long been a staple of the biotechnology and biopharmaceutical industry to protect their discoveries, is now considered, with few exceptions, ineligible in the first instance for protection under the patent laws of the U.S. Accordingly, we cannot predict the breadth of claims that may be allowed and remain enforceable in our patents or in those licensed from a third party.

Even if our patent applications issue as patents, they may not issue in a form that will provide us with any meaningful protection, prevent competitors from competing with us or otherwise provide us with any competitive advantage. Our competitors may be able to circumvent our owned or licensed patents by developing similar or alternative technologies or products in a non-infringing manner.

We also may rely on the regulatory period of market exclusivity for any of our biologic product candidates that are successfully developed and approved for commercialization. Although this period in the United States is generally 12 years from the date of marketing approval (depending on the nature of the specific product), there is a risk that the U.S. Congress could amend laws to significantly shorten this exclusivity period. Once any regulatory period of exclusivity expires, depending on the status of our patent coverage and the nature of the product, we may not be able to prevent others from marketing products that are biosimilar to or interchangeable with our products, which would materially adversely affect our business.

We depend on our licensors to maintain and enforce the intellectual property covering certain of our product candidates. We have limited, if any, control over the resources that our licensors can or will devote to securing, maintaining, and enforcing patents protecting our product candidates.

We depend on our licensors to protect the proprietary rights covering our product candidates and we have limited, if any, control over the amount or timing of resources that they devote on our behalf, or the priority they place on, maintaining patent rights and prosecuting patent applications to our advantage. Moreover, we have limited, if any, control over the strategies and arguments employed in the maintenance of patent rights and the prosecution of patent applications to our advantage. Our licensors might become involved in disputes with one of their other licensees, and we or a portion of our licensed patent rights might become embroiled in such disputes.

Our licensors, depending on the patent or application, are responsible for maintaining issued patents and prosecuting patent applications. We cannot be sure that they will perform as required. Should they decide they no longer want to maintain any of the patents licensed to us, they are required to afford us the opportunity to do so at our expense. If our licensors do not perform, and if we do not assume the maintenance of the licensed patents in sufficient time to make required payments or filings with the appropriate governmental agencies, we risk losing the benefit of all or some of those patent rights. Moreover, and possibly unbeknownst to us, our licensors may experience serious difficulties related to their overall business or financial stability, and they may be unwilling or unable to continue to expend the financial resources required to maintain and prosecute these patents and patent applications. While we intend to take actions reasonably necessary to enforce our patent rights, we depend, in part, on our licensors to protect a substantial portion of our proprietary rights and to inform us of the status of those protections and efforts thereto.

Our licensors may also be notified of alleged infringement and be sued for infringement of third-party patents or other proprietary rights. We may have limited, if any, control or involvement over the defense of these claims, and our licensors could be subject to injunctions and temporary or permanent exclusionary orders in the U.S. or other countries. Our licensors are not obligated to defend or assist in our defense against third-party claims of infringement. We have limited, if any, control over the amount or timing of resources, if any, that our licensors devote on our behalf or the priority they place on defense of such third-party claims of infringement.

Because of the uncertainty inherent in any patent or other litigation involving proprietary rights, we or our licensors may not be successful in defending claims of intellectual property infringement alleged by third parties, which could have a material adverse effect on our results of operations. Regardless of the outcome of any litigation, defending the litigation may be expensive, time-consuming and distracting to management.

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Protecting our proprietary rights is difficult and costly, and we may be unable to ensure their protection.

The degree of future protection for our proprietary rights is uncertain, because legal means afford only limited protection and may not adequately protect our rights or permit us to gain or keep our competitive advantage, in addition to being costly and time consuming to undertake. For example:

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our licensors might not have been the first to make the inventions covered by each of our pending patent applications and issued patents;

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our licensors might not have been the first to file patent applications for these inventions;

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others may independently develop similar or alternative technologies or duplicate our product candidates or any future product candidate technologies;

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it is possible that none of the pending patent applications licensed to us will result in issued patents;

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the scope of our issued patents may not extend to competitive products developed or produced by others;

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the issued patents covering our product candidates or any future product candidate may not provide a basis for market exclusivity for active products, may not provide us with any competitive advantages, or may be challenged by third parties;

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we may not develop additional proprietary technologies that are patentable; or

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intellectual property rights of others may have an adverse effect on our business.

We may become involved in lawsuits to protect or enforce our patents or other intellectual property, which could be expensive, time consuming and unsuccessful, and an unfavorable outcome in any litigation would harm our business.

Competitors may infringe our issued patents or other intellectual property. To counter infringement or unauthorized use, we may be required to file one or more actions for patent infringement, which can be expensive and time consuming. Any claims we assert against accused infringers could provoke these parties to assert counterclaims against us alleging that we infringe their patents; or provoke those parties to petition the USPTO to institute inter partes review against the asserted patents, which may lead to a finding that all or some of the claims of the patent are invalid. In addition, in a patent infringement proceeding, a court may decide that a patent of ours is invalid or unenforceable, in whole or in part, construe the patent’s claims narrowly or refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question or as a matter of public policy. An adverse result in any litigation proceeding could put one or more of our patents at risk of being invalidated, rendered unenforceable, or interpreted narrowly. Furthermore, adverse results on U.S. patents may affect related patents in our global portfolio.

If we or our licensors are sued for infringing intellectual property rights of third parties, it will be costly and time consuming, and an unfavorable outcome in that litigation would have a material adverse effect on our business.

Our success also depends on our ability, and the abilities of any of our respective current or future collaborators, to develop, manufacture, market and sell product candidates without infringing the proprietary rights of third parties. Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we are developing products, some of which may be directed at claims that overlap with the subject matter of our or our licensors’ intellectual property. Because patent applications can take many years to issue, there may be currently pending applications, unknown to us, which may later result in issued patents that our product candidates or proprietary technologies may infringe. Similarly, there may be issued patents relevant to our product candidates of which we or our licensors are not aware. Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the U.S. and other jurisdictions are typically not published until 18 months after a first filing, or in some cases not at all. Therefore, we cannot know with certainty whether we or such licensors were the first to make the inventions claimed in patents or pending patent applications that we own or licensed, or that we and our licensors were the first to file for patent protection of such inventions. In the event that a third party has also filed a U.S. patent application

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relating to our product candidates or a similar invention, depending upon the priority dates claimed by the competing parties, we may have to participate in interference proceedings declared by the USPTO to determine priority of invention in the U.S. The costs of these proceedings could be substantial, and it is possible that our efforts to establish priority of invention would be unsuccessful, resulting in a material adverse effect on our U.S. patent position. As a result, the issuance, scope, validity, enforceability and commercial value of our or any of our licensors’ patent rights are highly uncertain.

There is a substantial amount of litigation involving patent and other intellectual property rights in the biotechnology and biopharmaceutical industries generally. If a third party claims that we or any of our licensors, suppliers or collaborators infringe the third party’s intellectual property rights, we may have to, among other things:

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obtain additional licenses, which may not be available on commercially reasonable terms, if at all;

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abandon an infringing product candidate or redesign products or processes to avoid infringement, which may demand substantial funds, time and resources and which may result in inferior or less desirable processes and/or products;

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pay substantial damages, including the possibility of treble damages and attorneys’ fees, if a court decides that the product or proprietary technology at issue infringes on or violates the third party’s rights;

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pay substantial royalties, fees and/or grant cross-licenses to our product candidates; and/or

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defend litigation or administrative proceedings which may be costly regardless of outcome, and which could result in a substantial diversion of financial and management resources.

Intellectual property litigation could cause us to spend substantial resources and distract our personnel from their normal responsibilities.

Even if resolved in our favor, litigation or other legal proceedings relating to intellectual property claims may cause us to incur significant expenses and could distract our technical and management personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments and if securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock. Such litigation or proceedings could substantially increase our operating losses and reduce the resources available for development activities or any future sales, marketing or distribution activities. We may not have sufficient financial or other resources to conduct such litigation or proceedings adequately. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could compromise our ability to compete in the marketplace.

If we fail to comply with our obligations under our intellectual property licenses and third party funding arrangements, we could lose rights that are important to our business.

We are currently a party to license agreements with COH, Fred Hutch, Nationwide and Mayo Clinic. In the future, we may become party to licenses that are important for product development and commercialization. If we fail to comply with our obligations under current or future license and funding agreements, our counterparties may have the right to terminate these agreements, in which event we might not be able to develop, manufacture or market any product or utilize any technology that is covered by these agreements or may face other penalties under the agreements. Such an occurrence could materially and adversely affect the value of a product candidate being developed under any such agreement or could restrict our drug discovery activities. Termination of these agreements or reduction or elimination of our rights under these agreements may result in our having to negotiate new or reinstated agreements with less favorable terms, or cause us to lose our rights under these agreements, including our rights to important intellectual property or technology.

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We may be subject to claims that our employees and/or consultants have wrongfully used or disclosed to us alleged trade secrets of their former employers or other clients.

As is common in the biopharmaceutical industry, we rely on employees and consultants to assist in the development of product candidates, many of whom were previously employed at, or may have previously been or are currently providing consulting services to, other biopharmaceutical companies, including our competitors or potential competitors. We may become subject to claims related to whether these individuals have inadvertently or otherwise used, disclosed or misappropriated trade secrets or other proprietary information of their former employers or their former or current clients. Litigation may be necessary to defend against these claims. Even if we are successful in defending these claims, litigation could result in substantial costs and be a distraction to management and/or the employees or consultants that are implicated.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed.

In addition to seeking patent protection for our product candidates or any future product candidate, we also rely on trade secrets, including unpatented know-how, technology and other proprietary information, to maintain our competitive position, particularly where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We limit disclosure of such trade secrets where possible but we also seek to protect these trade secrets, in part, by entering into non-disclosure and confidentiality agreements with parties who do have access to them, such as our employees, our licensors, corporate collaborators, outside scientific collaborators, contract manufacturers, consultants, advisors and other third parties. We also enter into confidentiality and invention or patent assignment agreements with our employees and consultants. Despite these efforts, any of these parties may breach the agreements and may unintentionally or willfully disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult, expensive and time-consuming, and the outcome is unpredictable. In addition, some courts inside and outside the United States are less willing or unwilling to protect trade secrets. Moreover, if any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we would have no right to prevent them, or those to whom they communicate it, from using that technology or information to compete with us. If any of our trade secrets were to be disclosed to or independently developed by a competitor, our competitive position would be harmed.

We in-license intellectual property pertaining to certain product candidates from third parties. As such, any dispute with the licensors or the non-performance of such license agreements may adversely affect our ability to develop and commercialize the applicable product candidates.

The types of disputes which may arise between us and the third parties from whom we license intellectual property include, but are not limited to:

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the scope of rights granted under such license agreements and other interpretation-related issues;

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the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to such license agreements;

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the scope and interpretation of the representations and warranties made to us by our licensors, including those pertaining to the licensors’ right title and interest in the licensed technology and the licensors’ right to grant the licenses contemplated by such agreements;

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the sublicensing of patent and other rights under our license agreements and/or collaborative development relationships, and the rights and obligations associated with such sublicensing, including whether or not a given transaction constitutes a sublicense under such license agreement;

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the diligence and development obligations under license agreements (which may include specific diligence milestones) and what activities or achievements satisfy those diligence obligations;

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whether or not the milestones associated with certain milestone payment obligations have been achieved or satisfied;

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the applicability or scope of indemnification claims or obligations under such license agreements;

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the permissibility and advisability of, and strategy regarding, the pursuit of potential third-party infringers of the intellectual property that is the subject of such license agreements;

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the calculation of royalty, sublicense revenue and other payment obligations under such license agreements;

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the extent to which license rights, if any, are retained by licensors under such license agreements;

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whether or not a material breach has occurred under such license agreements and the extent to which such breach, if deemed to have occurred, is or can be cured within applicable cure periods, if any;

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disputes regarding patent filing and prosecution decisions, as well as payment obligations regarding past and ongoing patent expenses;

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intellectual property rights resulting from the joint creation or use of intellectual property (including improvements made to licensed intellectual property) by our and our partners’ licensors and us and our partners; and

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the priority of invention of patented technology.

In addition, the agreements under which we currently license intellectual property or technology from third parties are complex, and certain provisions in such agreements may be susceptible to multiple interpretations or may conflict in such a way that puts us in breach of one or more agreements, which would make us susceptible to lengthy and expensive disputes with one or more of such third-party licensing partners. The resolution of any contract interpretation disagreement that may arise could narrow what we believe to be the scope of our rights to the relevant intellectual property or technology, or increase what we believe to be our financial or other obligations under the relevant agreements, either of which could have a material adverse effect on our business, financial condition, results of operations and prospects. Moreover, if disputes over intellectual property that we have licensed prevent or impair our ability to maintain our current licensing arrangements on commercially acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates, which could have a material adverse effect on our business, financial conditions, results of operations and prospects.

Risks Relating to Our Control by Fortress

Fortress controls a voting majority of our common stock.

Pursuant to the terms of the Class A Preferred Stock held by Fortress, Fortress is entitled to cast, for each share of Class A Preferred held by Fortress, the number of votes that is equal to one and one-tenth (1.1) times a fraction, the numerator of which is the sum of (A) the shares of outstanding common stock and (B) the whole shares of common stock into which the shares of outstanding Class A common shares and the Class A Preferred Stock are convertible and the denominator of which is the number of shares of outstanding Class A Preferred Stock. Accordingly, Fortress is able to control or significantly influence all matters requiring approval by our stockholders, including the election of directors and the approval of mergers or other business combination transactions. The interests of Fortress may not always coincide with the interests of other stockholders, and Fortress may take actions that advance its own interests and are contrary to the desires of our other stockholders. Moreover, this concentration of voting power may delay, prevent or deter a change in control of us even when such a change may be in the best interests of all stockholders, could deprive our stockholders of an opportunity to receive a premium for their common stock as part of a sale of our Company or our assets, and might affect the prevailing market price of our common stock.

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Fortress has the right to receive a significant grant of shares of our common stock annually which will result in the dilution of your holdings of common stock upon each grant, which could reduce their value.

Under the terms of the Second Amended and Restated Founders Agreement (the “Founders Agreement”), which became effective July 22, 2016, Fortress will receive a grant of shares of our common stock equal to two and one-half percent (2.5%) of the gross amount of any equity or debt financing. Additionally, the Class A Preferred Stock, as a class, will receive an annual dividend on January 1st, payable in shares of common stock in an amount equal to two and one-half percent (2.5%) of our fully-diluted outstanding capital stock as of the business day immediately prior to January 1st of such year. Fortress currently owns all outstanding shares of Class A Preferred Stock. These share issuances to Fortress and any other holder of Class A Preferred Stock will dilute your holdings in our common stock and, if the value of our Company has not grown proportionately over the prior year, would result in a reduction in the value of your shares. The Founders Agreement has a term of 15 years and renews automatically for subsequent one-year periods unless terminated by Fortress or upon a Change in Control (as defined in the Founders Agreement).

We might have received better terms from unaffiliated third parties than the terms we receive in our agreements with Fortress.

The agreements we have entered into with Fortress include a Management Services Agreement and the Founders Agreement. While we believe the terms of these agreements are reasonable, they might not reflect terms that would have resulted from arm’s-length negotiations between unaffiliated third parties. The terms of the agreements relate to, among other things, payment of a royalty on product sales and the provision of employment and transition services. We might have received better terms from third parties because, among other things, third parties might have competed with each other to win our business.

The dual roles of our directors who also serve in similar roles with Fortress could create a conflict of interest and will require careful monitoring by our independent directors.

We share some directors with Fortress which could create conflicts of interest between the two companies in the future. While we believe that the Founders Agreement and the Management Services Agreement were negotiated by independent parties on both sides on arm’s length terms, and the fiduciary duties of both parties were thereby satisfied, in the future situations may arise under the operation of both agreements that may create a conflict of interest. We will have to be diligent to ensure that any such situation is resolved by independent parties. In particular, under the Management Services Agreement, Fortress and its affiliates are free to pursue opportunities which could potentially be of interest to us, and they are not required to notify us prior to pursuing such opportunities. Any conflict of interest or pursuit by Fortress of such a corporate opportunity could expose us to claims by our investors and/or creditors and could harm our results of operations.

General Risks and Risks Associated with Ownership of our Common Stock

Our business and operations would suffer in the event of computer system failures, cyber-attacks, or deficiencies in our or third parties’ cybersecurity.

We are increasingly dependent upon information technology systems, infrastructure, and data to operate our business. In the ordinary course of business, we collect, store, and transmit confidential information, including, but not limited to, information related to our intellectual property and proprietary business information, personal information, and other confidential information. It is critical that we maintain such confidential information in a manner that preserves its confidentiality and integrity. Furthermore, we have outsourced elements of our operations to third party vendors, who each have access to our confidential information, which increases our disclosure risk.

Despite the implementation of our internal security and business continuity measures and our information technology infrastructure, our internal computer systems and those of current and future third parties on which we rely may fail and are vulnerable to damage from computer viruses and unauthorized access. Our information technology and other internal infrastructure systems, including corporate firewalls, servers, data center facilities, lab equipment, and connection to the internet, face the risk of breakdown or other damage or interruption from service interruptions, system malfunctions, natural disasters, terrorism, war, and telecommunication and electrical failures, as well as security breaches from

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inadvertent or intentional actions by our employees, contractors, consultants, business partners, and/or other third parties, or from cyber-attacks by malicious third parties (including the deployment of harmful malware, ransomware, denial-of-service attacks, social engineering and other means to affect service reliability and threaten the confidentiality, integrity and availability of information), each of which could compromise our system infrastructure or lead to the loss, destruction, alteration, disclosure, or dissemination of, or damage or unauthorized access to, our data or data that is processed or maintained on our behalf, or other assets.

If such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our development programs and our business operations, and could result in financial, legal, business, and reputational harm to us.

In addition, the loss or corruption of, or other damage to, clinical trial data from completed or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. Likewise, we rely on third parties for the manufacture of our drug candidates or any future drug candidates and to conduct clinical trials, and similar events relating to their systems and operations could also have a material adverse effect on our business and lead to regulatory agency actions. The risk of a security breach or disruption, particularly through cyber-attacks or cyber intrusion, including by computer hackers, foreign governments, and cyber terrorists, has generally increased as the number, intensity, and sophistication of attempted attacks and intrusions from around the world have increased. Sophisticated cyber attackers (including foreign adversaries engaged in industrial espionage) are skilled at adapting to existing security technology and developing new methods of gaining access to organizations’ sensitive business data, which could result in the loss of proprietary information, including trade secrets. We may not be able to anticipate all types of security threats, and we may not be able to implement preventive measures effective against all such security threats. The techniques used by cyber criminals change frequently, may not be recognized until launched, and can originate from a wide variety of sources, including outside groups such as external service providers, organized crime affiliates, terrorist organizations, or hostile foreign governments or agencies.

Any security breach or other event leading to the loss or damage to, or unauthorized access, use, alteration, disclosure, or dissemination of, personal information, including personal information regarding clinical trial subjects, contractors, directors, or employees, our intellectual property, proprietary business information, or other confidential or proprietary information, could directly harm our reputation, enable competitors to compete with us more effectively, compel us to comply with federal and/or state breach notification laws and foreign law equivalents, subject us to mandatory corrective action, or otherwise subject us to liability under laws and regulations that protect the privacy and security of personal information. Each of the foregoing could result in significant legal and financial exposure and reputational damage that could adversely affect our business. Notifications and follow-up actions related to a security incident could impact our reputation or cause us to incur substantial costs, including legal and remediation costs, in connection with these measures and otherwise in connection with any actual or suspected security breach. We expect to incur significant costs in an effort to detect and prevent security incidents and otherwise implement our internal security and business continuity measures, and actual, potential, or anticipated attacks may cause us to incur increasing costs, including costs to deploy additional personnel and protection technologies, train employees, and engage third-party experts and consultants.

The costs related to significant security breaches or disruptions could be material, and our insurance policies may not be adequate to compensate us for the potential losses arising from any such disruption in, or failure or security breach of, our systems or third-party systems where information important to our business operations or commercial development is stored or processed. In addition, such insurance may not be available to us in the future on economically reasonable terms, or at all. Further, our insurance may not cover all claims made against us and could have high deductibles in any event, and defending a suit, regardless of its merit, could be costly and divert management attention. Furthermore, if the information technology systems of our third-party vendors and other contractors and consultants become subject to disruptions or security breaches, we may have insufficient recourse against such third parties and we may have to expend significant resources to mitigate the impact of such an event, and to develop and implement protections to prevent future events of this nature from occurring.

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Our business could be adversely affected by the effects of health pandemics or epidemics, which could cause significant disruptions in our operations.

Health pandemics or epidemics, such as the COVID-19 pandemic, have in the past and could again in the future result in quarantines, stay-at-home orders, remote work policies or other similar events that may disrupt businesses, delay our research and development programs and timelines, negatively impact productivity and increase risks associated with cybersecurity, the future magnitude of which will depend, in part, on the length and severity of the restrictions and other limitations. More specifically, these types of events may negatively impact personnel at third-party manufacturing facilities or the availability or cost of materials, which could disrupt our supply chain. In addition, impact on the operations of the FDA or other regulatory authorities could negatively affect our planned approval processes. Finally, economic conditions and business activity may be negatively impacted and may not recover as quickly as anticipated. The effects of epidemics and pandemic are highly uncertain and subject to change. If we are not able to respond to and manage the impact of such events effectively, our business, operating results, financial condition and cash flows could be adversely affected.

Our growth is subject to economic and geopolitical conditions.

Our business is affected by global and local economic and geopolitical conditions as well as the state of the financial markets, inflation, recession, financial liquidity, currency volatility, growth, and policy initiatives. There can be no assurance that global economic conditions and financial markets will not worsen and that we will not experience any adverse effects that may be material to our consolidated cash flows, results of operations, financial position or our ability to access capital, such as the adverse effects resulting from a prolonged shutdown in government operations both in the United States and internationally. Geopolitical changes, including war or other conflicts (including the conflicts between Russia and Ukraine and Israel and Hamas), some of which may be disruptive, could interfere with our supply chain, our customers and all of our activities in a particular location.

We may not be able to manage our business effectively if we are unable to attract and retain key personnel.

We may not be able to attract or retain qualified management and commercial, scientific and clinical personnel in the future due to the intense competition for qualified personnel among biotechnology, pharmaceutical and other businesses. If we are not able to attract and retain necessary personnel to accomplish our business objectives, we may experience constraints that will significantly impede the achievement of our development objectives, our ability to raise additional capital and our ability to implement our business strategy.

Our employees, consultants, or third-party partners may engage in misconduct or other improper activities, including but not necessarily limited to noncompliance with regulatory standards and requirements or internal procedures, policies or agreements to which such employees, consultants and partners are subject, any of which could have a material adverse effect on our business.

We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees, consultants, or third-party partners could include intentional failures to comply with FDA regulations, provide accurate information to the FDA, comply with cGMPs, comply with federal and state healthcare fraud and abuse laws and regulations, report financial information or data accurately, comply with internal procedures, policies or agreements to which such employees, consultants or partners are subject, or disclose unauthorized activities to us. In particular, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements. Employee, consultant, or third-party misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation, as well as civil and criminal liability. The precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business and results of operations, including the imposition of significant fines or other civil and/or criminal sanctions.

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We receive a large amount of proprietary information from potential or existing licensors of intellectual property and potential acquisition target companies, all pursuant to confidentiality agreements. The confidentiality and proprietary invention assignment agreements that we have in place with each of our employees and consultants prohibit the unauthorized disclosure of such information, but such employees or consultants may nonetheless disclose such information through negligence or willful misconduct. Any such unauthorized disclosures could subject us to monetary damages and/or injunctive or equitable relief. The notes, analyses and memoranda that we have generated based on such information are also valuable to our businesses, and the unauthorized disclosure or misappropriation of such materials by our employees and consultants could significantly harm our strategic initiatives – especially if such disclosures are made to our competitors.

We rely on information technology, and any internet or internal computer system failures, inadequacies, interruptions or compromises of our systems or the security of confidential information could damage our reputation and harm our business.

Although a significant portion of our business is conducted using traditional methods of contact and communications such as face-to-face meetings, our business is increasingly dependent on critical, complex and interdependent information technology systems, including internet-based systems, to support business processes as well as internal and external communications. We could experience system failures and degradations in the future. We cannot assure you that we will be able to prevent an extended and/or material system failure if any of the following or similar events occurs:

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human error;

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subsystem, component, or software failure;

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a power or telecommunications failure;

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hacker attacks, cyber-attacks, software viruses, security breaches, unauthorized access or intentional acts of vandalism; or

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terrorist acts or war.

If any of the foregoing events were to occur, our business operations could be disrupted in ways that would require the incurrence of substantial expenditures to remedy. Any system failure, accident or security breach that causes interruptions in our operations could result in a material disruption of our drug development programs. For example, the loss of clinical trial data from completed clinical trials for one or more of our product conducts could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data and applications, or inappropriate/unauthorized disclosure of confidential or proprietary information (including trade secrets), we could incur liability and our business and financial condition could be harmed.

The occurrence of a catastrophic disaster could damage our facilities beyond insurance limits, or we could lose key data which could cause us to curtail or cease operations.

We are vulnerable to damage and/or loss of vital data from natural disasters, such as earthquakes, tornadoes, power loss, fire, health epidemics and pandemics, floods and similar events, as well as from accidental loss or destruction. If any disaster were to occur, our ability to operate our businesses could be seriously impaired. We have property, liability and business interruption insurance that may not be adequate to cover losses resulting from disasters or other similar significant business interruptions, and we do not plan to purchase additional insurance to cover such losses due to the cost of obtaining such coverage. Any significant losses that are not recoverable under our insurance policies could seriously impair our business, financial condition and prospects. Any of the aforementioned circumstances, including without limitation the resurgence of COVID-19 virus, may also impede our employees’ and consultants’ abilities to provide services in-person and/or in a timely manner; hinder our ability to raise funds to finance our operations on favorable terms or at all; and trigger effectiveness of “force majeure” clauses under agreements with respect to which we receive goods and services, or under which we are obligated to achieve developmental milestones on certain timeframes. Disputes with third parties over

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the applicability of such “force majeure” clauses, or the enforceability of developmental milestones and related extension mechanisms in light of such business interruptions, may arise and may become expensive and time-consuming.

The market price for our common stock has been volatile and may continue to fluctuate or may decline significantly in the future.

An active, liquid and orderly market for our common stock may not be sustained, which could depress the trading price of our common stock or cause it to continue to be highly volatile or subject to wide fluctuations. Some of the factors that could negatively affect our share price or result in fluctuations in the price or trading volume of our common stock include, among other things:


	·	the commencement, enrollment, or results of our current and future preclinical studies and clinical trials, and the results of trials of our competitors or those of other companies in our market sector;


	·	regulatory approval of our product candidates, or limitations to specific label indications or patient populations for its use, or changes or delays in the regulatory review process;


	·	manufacturing, supply or distribution delays or shortages;


	·	our ability to identify and successfully acquire or in-license new product candidates on acceptable terms;


	·	FDA, state or international regulatory actions, including actions on regulatory applications any of our product candidates;


	·	legislative or regulatory changes;

judicial pronouncements interpreting laws and regulations;


	·	changes in government programs;


	·	announcements of new products, services or technologies, commercial relationships, acquisitions or other events by us or our competitors;


	·	market conditions in the pharmaceutical and biotechnology sectors;


	·	fluctuations in stock market prices and trading volumes of similar companies;


	·	changes in accounting principles;


	·	litigation or public concern about the safety of our product candidates or similar product candidates;


	·	sales of large blocks of our common stock, including sales by our executive officers, directors and significant shareholders; and


	·	our ability to obtain additional financing to advance our development operations;

These broad market and industry factors may decrease the market price of our common stock, regardless of our actual operating performance. The stock market in general has from time to time experienced extreme price and volume fluctuations. In addition, in the past, following periods of volatility in the overall market and decreases in the market price of a company’s securities, securities class action litigation has often been instituted against these companies. This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

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We may become involved in securities class action litigation that could divert management’s attention and harm our business.

The stock markets have from time to time experienced significant price and volume fluctuations that have affected the market prices for the common stock of biotechnology and pharmaceutical companies. These broad market fluctuations may cause the market price of our stock to decline. In the past, securities class action litigation has often been brought against a company following a decline in the market price of its securities. This risk is especially relevant for us because biotechnology and biopharmaceutical companies have experienced significant stock price volatility in recent years. We may become involved in this type of litigation in the future. Litigation often is expensive and diverts management’s attention and resources, which could adversely affect our business.

If we are unable to maintain compliance with all applicable continued listing requirements and standards of Nasdaq, our common stock may be delisted from Nasdaq.

Our common stock is listed on the Nasdaq Capital Market under the symbol “MBIO.” The Nasdaq Capital Market requires that listed companies satisfy continued listing standards to maintain their listing. On March 13, 2024, we received a deficiency letter (the “Letter”) from the Listing Qualifications Department (the “Staff”) of Nasdaq notifying us that we were not in compliance with the minimum stockholders’ equity requirement for continued listing on the Nasdaq Capital Market under Nasdaq Listing Rule 5550(b)(1) (the “Equity Rule”). The Equity Rule requires companies listed on The Nasdaq Capital Market to maintain stockholders’ equity of at least $2.5 million (or, in the alternative, a market value of listed securities of $35 million or net income from continued operations of $500,000 in the most recently completed fiscal year or in two of the last three most recently completed fiscal years). Our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, reported stockholders’ equity of $123,000, and as of September 30, 2024, we reported a stockholders’ deficit of approximately $8.7 million.

The Letter had no immediate effect on our continued listing Nasdaq, subject to our compliance with the other continued listing requirements. In accordance with the Nasdaq Listing Rules, we were provided 45 calendar days, or until April 29, 2024, to submit a plan to regain compliance with the Equity Rule (the “Compliance Plan”). We submitted our Compliance Plan on April 29, 2024, and the Staff granted our request for an extension of 180 calendar days, through September 9, 2024, to regain compliance with the Equity Rule. We were unable to demonstrate compliance with the Equity Rule by September 9, 2024.

On September 10, 2024, the Staff formally notified us that it had determined to delist our securities from Nasdaq based upon our continued non-compliance with Equity Rule unless we timely request a hearing before the Nasdaq Hearings Panel (the “Panel”). On September 17, 2024, we requested a hearing before the Panel, which stayed any further action by Nasdaq at least pending completion of the hearing and the expiration of any extension that may be granted by the Panel to us following the hearing. The hearing took place on October 29, 2024, and we are currently awaiting the decision of the Panel.

On May 16, 2024, we received a notice (the “Second Letter”) from the Staff indicating that the bid price of our common stock had closed below $1.00 per share for 30 consecutive business days and, as a result, we were not in compliance with Nasdaq Listing Rule 5550(a)(2), which sets forth the minimum bid price requirement for continued listing on The Nasdaq Capital Market (the “Bid Price Rule”). Pursuant to Nasdaq Listing Rule 5810(c)(3)(A), we were afforded a 180-calendar day grace period, or until November 12, 2024, to regain compliance with the Bid Price Rule, which necessitates a closing bid price of at least $1.00 per share for a minimum of ten consecutive business days by November 12, 2024. Accordingly, we do not expect to evidence compliance with the Bid Price Rule by November 12, 2024, and the bid price deficiency will thereafter serve as an additional basis for delisting from Nasdaq. We addressed our plan to regain compliance with the Bid Price Rule at our hearing before the Panel on October 29, 2024.

If we are delisted from Nasdaq, there can be no assurance that our common stock will be eligible for trading on another stock exchange or quotation on an over-the-counter market. If we are not able to obtain a listing on another stock exchange or quotation service for our common stock, it may be extremely difficult or impossible for stockholders to sell their shares. Additionally, if we are delisted from Nasdaq, but obtain a substitute listing or quotation service for our common stock, it will likely be on a market with less liquidity and our common stock may therefore experience

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potentially more price volatility than it has historically experienced on Nasdaq. Stockholders may not be able to sell their shares of common stock on any such substitute market in the quantities, at the times, or at the prices that could potentially be available on a more liquid trading market. As a result of these factors, if our common stock is delisted from Nasdaq, the value and liquidity of our common stock would likely be adversely affected. A delisting of our common stock from Nasdaq could also adversely affect our ability to obtain financing for our operations and/or result in a loss of confidence by investors, employees and/or business partners.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Pursuant to our Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), we issued 353,086 shares of our common stock to Fortress as the Annual Stock Dividend (as such term is defined in the Certificate of Incorporation), representing 2.5% of our fully-diluted outstanding equity on January 2, 2024.

The issuance of the above securities was deemed to be exempt from registration under the Securities Act in reliance upon Section 4(a)(2) of the Securities Act as a transaction by an issuer not involving any public offering.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

During the three months ended September 30, 2024, none of our directors or officers (as defined in Rule 16a-1(f) of the Exchange Act) adopted or terminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K under the Securities Act).

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Item 6. Exhibits

The exhibits listed on the Exhibit Index are either filed or furnished with this report or incorporated herein by reference.

EXHIBIT INDEX


Exhibit No.		Description

10.1		Asset Purchase Agreement, dated June 27, 2024, between the Company and uBriGene (Boston) Biosciences, Inc. (incorporated by reference to Exhibit 1.1 to the Registrant’s Current Report on Form 8-K filed on July 3, 2024 (File No. 001-38191)).

31.1		Certification of President and Chief Executive Officer (Principal Executive Officer), pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

31.2		Certification of Interim Chief Financial Officer (Principal Financial Officer), pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).

32.1		Certification of President and Chief Executive Officer (Principal Executive Officer), pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).

32.2		Certification of Interim Chief Financial Officer (Principal Financial Officer), pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).

101		The following financial information from the Company’s Quarterly Report on Form 10-Q for the period ended September 30, 2024, formatted as Inline Extensible Business Reporting Language (iXBRL): (i) the Balance Sheets, (ii) the Unaudited Statements of Operations, (iii) the Unaudited Statement of Stockholders’ Equity, (iv) the Unaudited Statements of Cash Flows, and (v) Notes to the Unaudited Financial Statements (filed herewith).

104		Cover Page Interactive Data File (formatted as Inline XBRL and contained in exhibit 101)

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Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	MUSTANG BIO, INC.

November 8, 2024	By:	/s/ Manuel Litchman, M.D.
		Manuel Litchman, M.D., President and
		Chief Executive Officer
		(Principal Executive Officer)

	By:	/s/ James Murphy
		James Murphy
		Interim Chief Financial Officer
		(Principal Financial Officer)

Exhibit 31.1

MUSTANG BIO, INC.

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Manuel Litchman, M.D., President and Chief Executive Officer (Principal Executive Officer), certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q of Mustang Bio, Inc. (the “Registrant”);

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

(4) The Registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter (the Registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

(5) The Registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant’s auditors and the audit committee of the Registrant’s board of directors (or persons performing the equivalent functions):

all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.

AugAustAugust

November 8, 2024	By:	/s/ Manuel Litchman
		Manuel Litchman, M.D., President and
		Chief Executive Officer
		(Principal Executive Officer)

Exhibit 31.2

MUSTANG BIO, INC.

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James Murphy, Interim Chief Financial Officer (Principal Financial Officer), certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q of Mustang Bio, Inc. (the “Registrant”);

a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. evaluated the effectiveness of the Registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. disclosed in this report any change in the Registrant’s internal control over financial reporting that occurred during the Registrant’s most recent fiscal quarter (the Registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting; and

a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant’s ability to record, process, summarize and report financial information; and

b. any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant’s internal control over financial reporting.


November 8, 2024	By:	/s/ James Murphy
		James Murphy
		Interim Chief Financial Officer
		(Principal Financial Officer)

Exhibit 32.1

MUSTANG BIO, INC.

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Mustang Bio, Inc. (the “Company”) on Form 10-Q for the quarterly period ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Manuel Litchman, M.D., President and Chief Executive Officer (Principal Executive Officer), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company, as of, and for, the periods presented in the Report.


November 8, 2024	By:	/s/ Manuel Litchman
		Manuel Litchman, M.D., President and
		Chief Executive Officer
		(Principal Executive Officer)

Exhibit 32.2

MUSTANG BIO, INC.

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Mustang Bio, Inc. (the “Company”) on Form 10-Q for the quarterly period ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James Murphy, Interim Chief Financial Officer (Principal Financial Officer), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

August
November 8, 2024	By:	/s/ James Murphy
		James Murphy
		Interim Chief Financial Officer
		(Principal Financial Officer)

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2024	Nov. 07, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Securities Act File Number	001-38191
Entity Registrant Name	MUSTANG BIO, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-3828760
Entity Address, Address Line One	377 Plantation Street
Entity Address, City or Town	Worcester
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01605
City Area Code	781
Local Phone Number	652-4500
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	MBIO
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001680048
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A common shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		845,385
Common shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		46,934,863

Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 3,525	$ 6,234
Other receivables	237	3,879
Prepaid expenses and other current assets	84	1,233
Property, plant and equipment, held for sale	2,209	0
Total current assets	6,055	11,346
Property, plant and equipment, net	421	3,247
Restricted cash	375	750
Other assets	250	833
Operating lease right-of-use asset, net	92	1,566
Total Assets	7,193	17,742
Current Liabilities:
Accounts payable and accrued expenses	12,061	14,017
Payables and accrued expenses - related party	$ 2,535	$ 834
Other Liability, Current, Related Party [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
Operating lease liabilities - short-term	$ 442	$ 520
Total current liabilities	15,038	15,371
Deferred income	270	270
Operating lease liabilities - long-term	541	1,978
Total Liabilities	15,849	17,619
Commitments and Contingencies (Note 12)
Stockholders' Equity
Preferred stock ($0.0001 par value), 2,000,000 shares authorized, 250,000 shares of Class A preferred stock issued and outstanding as of September 30, 2024 and December 31, 2023, respectively	0	0
Common stock issuable, zero and 419,089 shares as of September 30, 2024 and December 31, 2023, respectively	0	591
Additional paid-in capital	387,112	380,502
Accumulated deficit	(395,771)	(380,971)
Total Stockholders' Equity	(8,656)	123
Total Liabilities and Stockholders' Equity	7,193	17,742
Class A common shares
Stockholders' Equity
Common stock ($0.0001 par value), 200,000,000 shares authorized as of September 30, 2024 and December 31, 2023, respectively	0	0
Common shares
Stockholders' Equity
Common stock ($0.0001 par value), 200,000,000 shares authorized as of September 30, 2024 and December 31, 2023, respectively	$ 3	$ 1

Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2024	Dec. 31, 2023
Preferred stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	250,000	250,000
Preferred stock, shares outstanding	250,000	250,000
Common stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issuable	0	419,089
Class A common shares
Common stock, shares issued	845,385	845,385
Common stock, shares outstanding	845,385	845,385
Common shares
Common stock, shares issued	36,827,671	8,374,869
Common stock, shares outstanding	36,827,671	8,374,869

Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating expenses:
Research and development	$ 57	$ 9,527	$ 8,221	$ 34,363
Asset impairment	0	0	2,649	0
Gain on the sale of property and equipment	0	(1,351)	0	(1,351)
General and administrative	1,400	2,131	4,358	7,507
Total operating expenses	1,457	10,307	15,228	40,519
Loss from operations	(1,457)	(10,307)	(15,228)	(40,519)
Other income (expense)
Other income		138	314	918
Interest income	48	115	118	727
Interest expense	(1)	(4)	(4)	(4,112)
Total other income (expense)	47	249	428	(2,467)
Net Loss	$ (1,410)	$ (10,058)	$ (14,800)	$ (42,986)
Net loss per common share outstanding, basic	$ (0.04)	$ (1.23)	$ (0.62)	$ (5.29)
Net loss per common share outstanding, diluted	$ (0.04)	$ (1.23)	$ (0.62)	$ (5.29)
Weighted average number of common shares outstanding, basic	36,840,427	8,171,582	23,786,939	8,131,191
Weighted average number of common shares outstanding, diluted	36,840,427	8,171,582	23,786,939	8,131,191

Statements of Stockholders' Equity (Unaudited) $ in Thousands	Class A Preferred Shares Preferred Stock shares	Class A Common Shares Common Shares shares	Common Shares Common Shares USD ($) shares	Common Stock Issuable USD ($)	Additional Paid-in Capital USD ($)	Accumulated Deficit USD ($)	USD ($) shares
Balances at Dec. 31, 2022			$ 11	$ 1,109	$ 374,522	$ (329,369)	$ 46,273
Balances (in shares) at Dec. 31, 2022 \| shares	250,000	845,385	7,100,111
Issuance of common shares - Founders Agreement				(1,109)	1,109
Issuance of common shares - Founders Agreement (in shares) \| shares			187,134
Issuance of common shares, equity fee on At-the-Market Offering				4			4
Issuance of common shares, net of offering costs - At-the-Market Offering					160		160
Issuance of common shares, net of offering costs - At-the-Market Offering (in shares) \| shares			51,880
Issuance of common shares under ESPP					178		178
Issuance of common shares under ESPP (in shares) \| shares			47,511
Stock-based compensation expenses					380		$ 380
Stock-based compensation expenses (in shares) \| shares			65,919
Exercise of warrants (in shares) \| shares			93
Reverse Split (15:1) adjustment			$ (10)		10
Reverse split ratio							15
Fractional share adjustment (in shares) \| shares			(1,633)
Net loss						(42,986)	$ (42,986)
Balances at Sep. 30, 2023			$ 1	4	376,359	(372,355)	4,009
Balances (in shares) at Sep. 30, 2023 \| shares	250,000	845,385	7,451,015
Balances at Jun. 30, 2023			$ 1		376,009	(362,297)	13,713
Balances (in shares) at Jun. 30, 2023 \| shares	250,000	845,385	7,320,444
Issuance of common shares, equity fee on At-the-Market Offering				4			4
Issuance of common shares, net of offering costs - At-the-Market Offering					160		160
Issuance of common shares, net of offering costs - At-the-Market Offering (in shares) \| shares			51,880
Issuance of common shares under ESPP					90		90
Issuance of common shares under ESPP (in shares) \| shares			34,869
Stock-based compensation expenses					100		100
Stock-based compensation expenses (in shares) \| shares			43,822
Net loss						(10,058)	(10,058)
Balances at Sep. 30, 2023			$ 1	4	376,359	(372,355)	4,009
Balances (in shares) at Sep. 30, 2023 \| shares	250,000	845,385	7,451,015
Balances at Dec. 31, 2023			$ 1	591	380,502	(380,971)	123
Balances (in shares) at Dec. 31, 2023 \| shares	250,000	845,385	8,374,869
Issuance of common shares - Founders Agreement				(477)	669		192
Issuance of common shares - Founders Agreement (in shares) \| shares			994,826
Issuance of common shares, equity fee on At-the-Market Offering				$ (114)	114
Issuance of common shares, equity fee on At-the-Market Offering (in shares) \| shares			66,003
Issuance of common shares, net of offering costs - Equity Offerings					5,160		5,160
Issuance of common shares, net of offering costs - Equity Offerings (in shares) \| shares			4,185,000
Issuance of common shares, net of offering costs - At-the-Market Offering					1,118		1,118
Issuance of common shares, net of offering costs - At-the-Market Offering (in shares) \| shares			2,661,943
Issuance of common shares under ESPP					48		$ 48
Issuance of common shares under ESPP (in shares) \| shares			47,463				128,352
Stock-based compensation expenses					(500)		$ (500)
Stock-based compensation expenses (in shares) \| shares			6,693
Exercise of warrants			$ 2		1		3
Exercise of warrants (in shares) \| shares			20,490,874
Net loss						(14,800)	(14,800)
Balances at Sep. 30, 2024			$ 3		387,112	(395,771)	(8,656)
Balances (in shares) at Sep. 30, 2024 \| shares	250,000	845,385	36,827,671
Balances at Jun. 30, 2024			$ 3		386,028	(394,361)	(8,330)
Balances (in shares) at Jun. 30, 2024 \| shares	250,000	845,385	34,098,059
Issuance of common shares - Founders Agreement					29		29
Issuance of common shares - Founders Agreement (in shares) \| shares			66,549
Issuance of common shares, net of offering costs - At-the-Market Offering					1,118		1,118
Issuance of common shares, net of offering costs - At-the-Market Offering (in shares) \| shares			2,661,943
Offering costs - Equity Offerings					(105)		(105)
Stock-based compensation expenses					42		42
Stock-based compensation expenses (in shares) \| shares			1,120
Net loss						(1,410)	(1,410)
Balances at Sep. 30, 2024			$ 3		$ 387,112	$ (395,771)	$ (8,656)
Balances (in shares) at Sep. 30, 2024 \| shares	250,000	845,385	36,827,671

Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities:
Net loss	$ (14,800)	$ (42,986)
Adjustments to reconcile net loss to net cash used in operating activities:
Issuance of common shares - Equity fee on Equity Offerings to Fortress Biotech	192	0
Common shares issuable - Equity fee on at-the-market offering to Fortress Biotech	0	4
Research and development - licenses acquired	0	50
Stock-based compensation expenses	(500)	380
Depreciation expense	620	1,576
Amortization of debt discount	0	118
Amortization of operating lease right-of-use assets	128	286
Loss on disposal of property and equipment	29	0
Asset impairment	2,649	0
Gain on sale of property and equipment	0	(1,351)
Loss on extinguishment of debt	0	2,796
Gain on lease modification	(314)	(220)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	702	(1,688)
Accounts payable and accrued expenses	(150)	(1,299)
Payable and accrued expenses - related party	1,701	239
Lease liabilities	(329)	(163)
Net cash used in operating activities	(9,413)	(42,223)
Cash Flows from Investing Activities:
Purchase of research and development licenses	0	(50)
Proceeds from the sale of property and equipment	0	6,000
Purchase of fixed assets	0	(34)
Net cash from investing activities	0	5,916
Cash Flows from Financing Activities:
Payment of debt	0	(30,375)
Proceeds from issuance of common shares - Equity Offerings	5,944	163
Offering costs for the issuance of common shares - Equity Offerings	(784)	(3)
Proceeds from issuance of common shares - At-the-Market Offering	1,163	0
Offering costs for the issuance of common shares - At-the-Market Offering	(45)	0
Proceeds from exercise of warrants	3	0
Proceeds from issuance of common shares under ESPP	48	178
Net cash provided by financing activities	6,329	(30,037)
Net change in cash, cash equivalents and restricted cash	(3,084)	(66,344)
Cash, cash equivalents and restricted cash, beginning of the period	6,984	76,656
Cash, cash equivalents and restricted cash, end of the period	3,900	10,312
Supplemental disclosure of cash flow information:
Cash paid for interest	0	1,340
Supplemental disclosure of noncash activities:
Issuance of common shares - Founders Agreement and Equity fee to Fortress	591	1,109
Related Party
Changes in operating assets and liabilities:
Other receivables	0	36
Non related party
Changes in operating assets and liabilities:
Other receivables	$ 659	$ 0

Statements of Cash Flows - Non-Cash Activities (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Supplemental disclosure of noncash activities related to the uBriGene Repurchase Transaction (see Note 5):
Fair value of assets received	$ 2,209	$ 0
Fair value of supplies received expensed to research and development	2,509	0
Accounts receivable written off	(6,967)	0
Accounts payable written off	3,644	0
Deferred purchase consideration	$ (1,295)	$ 0

Organization, Description of Business and Liquidity and Capital Resources

9 Months Ended

Sep. 30, 2024

Organization, Description of Business and Liquidity and Capital Resources

Organization, Description of Business and Liquidity and Capital Resources

Note 1 - Organization, Description of Business and Liquidity and Capital Resources

The Company is a majority-controlled subsidiary of Fortress Biotech, Inc. (“Fortress” or “Parent”).

Liquidity and Capital Resources

Significant Accounting Policies

9 Months Ended

Sep. 30, 2024

Significant Accounting Policies

Significant Accounting Policies

Note 2 - Significant Accounting Policies

Basis of Presentation

Use of Estimates

Cash, Cash Equivalents and Restricted Cash

The Company records cash held in an escrow account as a security deposit for the manufacturing facility in Worcester, Massachusetts, as restricted cash.


	September 30,
($ in thousands)	2024	2023
Cash and cash equivalents	$ 3,525	$ 9,562
Restricted cash	375	750
Total cash, cash equivalents and restricted cash	$ 3,900	$ 10,312

Assets Held for Sale

Impairment of Long-Lived Assets

Significant Accounting Policies

There have been no material changes to the Company’s significant accounting policies previously disclosed in the 2023 Form 10-K.

Recently Issued Accounting Standards

Clinical Trial and Sponsored Research Agreements

9 Months Ended

Sep. 30, 2024

Clinical Trial and Sponsored Research Agreements

Clinical Trial and Sponsored Research Agreements

Note 3 - Clinical Trial and Sponsored Research Agreements

Research and Development Expenses – Clinical Trial and Sponsored Research Agreements


	For the three months ended September 30,				For the nine months ended September 30,
($ in thousands)	2024		2023		2024		2023
City of Hope National Medical Center
CD123	$	—	$	23	$	—	$	23
IL13Rα2		66		180		457		817
CS1⁽¹⁾		—		—		—		188
PSCA⁽¹⁾		—		—		—		44
Fred Hutchinson Cancer Center - CD20		—		142		312		1,239
St. Jude Children's Research Hospital - XSCID⁽²⁾		—		(106)		(434)		528
Leiden University Medical Center - RAG1 SCID		—		125		241		349
Mayo Clinic⁽³⁾		—		—		(275)		551
Total	$	66	$	364	$	301	$	3,739

⁽¹⁾ Licenses and associated sponsored research agreements were terminated in May 2023.

⁽²⁾ License and associated Data Transfer Agreement were terminated in April 2024.

⁽³⁾ License and associated sponsored research agreement were terminated in June 2024.

Ongoing Clinical Trial and Sponsored Research Agreements

IL13Rα2 (MB-101) Clinical Research Support Agreements with City of Hope

CD20 (MB-106) Clinical Trial Agreement with Fred Hutchinson Cancer Center

Terminated Clinical Trial and Sponsored Research Agreements

Related Party Agreements

9 Months Ended

Sep. 30, 2024

Related Party Agreements

Related Party Agreements

Note 4 - Related Party Agreements

Founders Agreement and Management Services Agreement with Fortress

Annual Stock Dividend

Payables and Accrued Expenses Related Party

In the normal course of business Fortress pays for certain expenses on behalf of the Company. Such expenses are recorded as payables and accrued expenses - related party.

Assets Purchase Agreements

9 Months Ended

Sep. 30, 2024

Assets Purchase Agreements

Assets Purchase Agreements

Note 5 – Assets Purchase Agreements

Agreements with uBriGene

June 2024 Repurchase of Assets

Property, Plant and Equipment, and Asset Impairment

9 Months Ended

Sep. 30, 2024

Property, Plant and Equipment, and Asset Impairment

Property, Plant and Equipment, and Asset Impairment

Note 6 – Property, Plant and Equipment, and Asset Impairment

At September 30, 2024, and December 31, 2023, property, plant and equipment consisted of the following:


	Estimated Useful	September 30,		December 31,
($ in thousands)	Life (in years)	2024		2023
Leasehold improvements	9		7,694		7,694
Construction in process	N/A		—		29
Total property, plant and equipment			7,694		7,723
Less: impairment loss			(2,176)		—
Less: accumulated depreciation			(5,097)		(4,476)
Property, plant and equipment, net		$	421	$	3,247

Impairment of Long-Lived Assets

Accounts Payable and Accrued Expenses

9 Months Ended

Sep. 30, 2024

Accounts Payable and Accrued Expenses

Accounts Payable and Accrued Expenses

Note 7 - Accounts Payable and Accrued Expenses

At September 30, 2024, and December 31, 2023, accounts payable and accrued expenses consisted of the following:


	September 30,		December 31,
($ in thousands)	2024		2023
Accounts payable	$	8,759	$	6,322
Accrued research and development		561		4,118
Accrued compensation		984		2,838
Other ⁽¹⁾		1,757		739
Total accounts payable and accrued expenses	$	12,061	$	14,017

⁽¹⁾ Other includes approximately $1.3 million of accrued consideration for the uBriGene Asset Purchase Agreement, see Note 5.

Notes Payable

9 Months Ended

Sep. 30, 2024

Notes Payable

Notes Payable

Note 8 – Notes Payable


	For the nine months ended September 30,
($ in thousands)	2024		2023
Interest expense	$	—	$	1,187
Amortization of Debt Discount		—		118
Loss on Extinguishment		—		2,796
Other		4		11
Total Interest Expense	$	4	$	4,112

Stockholders' Equity

9 Months Ended

Sep. 30, 2024

Stockholders' Equity

Stockholders' Equity

Note 9 - Stockholders’ Equity

Registration Statements

May 2024 Equity Offering

June 2024 Registered Direct Offering and Concurrent Private Placement of Warrants (the “June 2024 Offering”)

At-the-Market Offering

Equity Incentive Plan

As of September 30, 2024, 397,723 shares were available for future issuance under the Incentive Plan.

Stock Options

The following table summarizes stock option activities for the nine months ended September 30, 2024:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Stock Options	Exercise Price		years)
Outstanding at December 31, 2023	76,112	$	85.95	3.31
Outstanding at September 30, 2024	76,112	$	85.95	2.56
Options vested and exercisable at September 30, 2024	47,570	$	85.95	2.56

As of September 30, 2024, the Company had no unrecognized stock-based compensation expense related to options. The Company accounts for forfeited awards as they occur.

Restricted Stock

The following table summarizes restricted stock award activities for the nine months ended September 30, 2024:


		Weighted Average
		Grant Date Fair
	Number of Shares	Value
Nonvested at December 31, 2023	64,706	$	11.59
Vested	(4,595)		54.45
Nonvested at September 30, 2024	60,111	$	8.32

Restricted Stock Units


		Weighted Average
		Grant Date Fair
	Number of Units	Value
Nonvested at December 31, 2023	95,197	$	18.78
Forfeited	(64,892)		18.19
Vested	(18,926)		23.26
Nonvested at September 30, 2024	11,379	$	14.69

The following table summarizes stock-based compensation expense for the three and nine months ended September 30, 2024 and 2023 (in thousands):


	For the three months ended September 30,				For the nine months ended September 30,
	2024		2023		2024		2023
General and administrative	$	52	$	119	$	150	$	381
Research and development		(10)		(19)		(650)		(1)
Total stock-based compensation expense	$	42	$	100	$	(500)	$	380

Employee Stock Purchase Plan

As of September 30, 2024, 128,352 shares have been purchased and 338,315 shares are available for future sale under the Company’s ESPP.

Warrants

A summary of warrant activities for the nine months ended September 30, 2024, is presented below:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Warrants	Exercise Price		years)
Outstanding as of December 31, 2023	4,481,868	$	1.34	5.34
Exercised	(20,490,874)		—	—
Granted	76,966,010		0.19	2.50
Outstanding as of September 30, 2024	60,957,004	$	0.29	2.73

with these offerings, Wainwright received Placement Agent Warrants to purchase up to 1,012,658 shares of common stock.

Net Loss per Share

9 Months Ended

Sep. 30, 2024

Net Loss per Share

Net Loss per Share

Note 10 – Net Loss per Share

The table below summarizes potentially dilutive securities that were not considered in the computation of diluted net loss per share because they would be anti-dilutive.


	For the nine months ended September 30,
	2024	2023
Warrants	60,957,004	70,102
Options	76,112	76,112
Class A Preferred Shares	250,000	250,000
Unvested restricted stock awards	60,111	64,706
Unvested restricted stock units	11,379	106,100
Total	61,354,606	567,020

Income Taxes

9 Months Ended

Sep. 30, 2024

Income Taxes

Income Taxes

Note 11 – Income Taxes

Commitments and Contingencies

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies

Commitments and Contingencies

Note 12 – Commitments and Contingencies

Indemnification

Leases

The following summarizes quantitative information about the Company’s operating leases:


	For the Nine Months Ended
		September 30,		September 30,
($ in thousands)	2024		2023
Lease cost
Operating lease cost	$	113	$	592
Variable lease cost		149		544
Total	$	262	$	1,136


	For the Nine Months Ended
		September 30,			September 30,
($ in thousands)	2024			2023
Operating cash flows from operating leases	$	406		$	395
Gain on lease modification	$	314		$	220
Weighted-average remaining lease term – operating leases		2.0			4.7
Weighted-average discount rate – operating leases		9.0	%		9.1	%

Maturities of our operating leases, excluding short-term leases, are as follows:


($ in thousands)	Future Lease Liability
Three months ended December 31, 2024	$	127
Year ended December 31, 2025		516
Year ended December 31, 2026		439
Total		1,082
Less present value discount		(99)
Operating lease liabilities	$	983

Subsequent Events

9 Months Ended

Sep. 30, 2024

Subsequent Events

Subsequent Events

Note 13 – Subsequent Events

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (1,410)	$ (10,058)	$ (14,800)	$ (42,986)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2024

Significant Accounting Policies

Basis of Presentation

Use of Estimates

Cash, Cash Equivalents and Restricted Cash

The Company records cash held in an escrow account as a security deposit for the manufacturing facility in Worcester, Massachusetts, as restricted cash.


	September 30,
($ in thousands)	2024	2023
Cash and cash equivalents	$ 3,525	$ 9,562
Restricted cash	375	750
Total cash, cash equivalents and restricted cash	$ 3,900	$ 10,312

Assets Held for Sale

Impairment of Long-Lived Assets

Significant Accounting Policies

There have been no material changes to the Company’s significant accounting policies previously disclosed in the 2023 Form 10-K.

Recently Issued Accounting Standards

Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2024

Significant Accounting Policies

Reconciliation of Cash, Cash Equivalents, and Restricted Cash


	September 30,
($ in thousands)	2024	2023
Cash and cash equivalents	$ 3,525	$ 9,562
Restricted cash	375	750
Total cash, cash equivalents and restricted cash	$ 3,900	$ 10,312

Clinical Trial and Sponsored Research Agreements (Tables)

9 Months Ended

Sep. 30, 2024

Clinical trial and sponsored research agreements

License, Clinical Trial and Sponsored Research Agreements

Schedule of Clinical Trial and Sponsored Research Agreements


	For the three months ended September 30,				For the nine months ended September 30,
($ in thousands)	2024		2023		2024		2023
City of Hope National Medical Center
CD123	$	—	$	23	$	—	$	23
IL13Rα2		66		180		457		817
CS1⁽¹⁾		—		—		—		188
PSCA⁽¹⁾		—		—		—		44
Fred Hutchinson Cancer Center - CD20		—		142		312		1,239
St. Jude Children's Research Hospital - XSCID⁽²⁾		—		(106)		(434)		528
Leiden University Medical Center - RAG1 SCID		—		125		241		349
Mayo Clinic⁽³⁾		—		—		(275)		551
Total	$	66	$	364	$	301	$	3,739

⁽¹⁾ Licenses and associated sponsored research agreements were terminated in May 2023.

⁽²⁾ License and associated Data Transfer Agreement were terminated in April 2024.

⁽³⁾ License and associated sponsored research agreement were terminated in June 2024.

Property, Plant and Equipment, and Asset Impairment (Tables)

9 Months Ended

Sep. 30, 2024

Property, Plant and Equipment, and Asset Impairment

Schedule of Property, Plant and Equipment


	Estimated Useful	September 30,		December 31,
($ in thousands)	Life (in years)	2024		2023
Leasehold improvements	9		7,694		7,694
Construction in process	N/A		—		29
Total property, plant and equipment			7,694		7,723
Less: impairment loss			(2,176)		—
Less: accumulated depreciation			(5,097)		(4,476)
Property, plant and equipment, net		$	421	$	3,247

Accounts Payable and Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2024

Accounts Payable and Accrued Expenses

Schedule of Accounts Payable and Accrued Expenses


	September 30,		December 31,
($ in thousands)	2024		2023
Accounts payable	$	8,759	$	6,322
Accrued research and development		561		4,118
Accrued compensation		984		2,838
Other ⁽¹⁾		1,757		739
Total accounts payable and accrued expenses	$	12,061	$	14,017

⁽¹⁾ Other includes approximately $1.3 million of accrued consideration for the uBriGene Asset Purchase Agreement, see Note 5.

Notes Payable (Tables)

9 Months Ended

Sep. 30, 2024

Notes Payable

Schedule of components in interest expense


	For the nine months ended September 30,
($ in thousands)	2024		2023
Interest expense	$	—	$	1,187
Amortization of Debt Discount		—		118
Loss on Extinguishment		—		2,796
Other		4		11
Total Interest Expense	$	4	$	4,112

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of Stock Option Activities

The following table summarizes stock option activities for the nine months ended September 30, 2024:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Stock Options	Exercise Price		years)
Outstanding at December 31, 2023	76,112	$	85.95	3.31
Outstanding at September 30, 2024	76,112	$	85.95	2.56
Options vested and exercisable at September 30, 2024	47,570	$	85.95	2.56

Schedule of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense for the three and nine months ended September 30, 2024 and 2023 (in thousands):


	For the three months ended September 30,				For the nine months ended September 30,
	2024		2023		2024		2023
General and administrative	$	52	$	119	$	150	$	381
Research and development		(10)		(19)		(650)		(1)
Total stock-based compensation expense	$	42	$	100	$	(500)	$	380

Summary of Warrant Activities

A summary of warrant activities for the nine months ended September 30, 2024, is presented below:


				Weighted Average
				Remaining
		Weighted Average		Contractual Life (in
	Warrants	Exercise Price		years)
Outstanding as of December 31, 2023	4,481,868	$	1.34	5.34
Exercised	(20,490,874)		—	—
Granted	76,966,010		0.19	2.50
Outstanding as of September 30, 2024	60,957,004	$	0.29	2.73

Restricted stock award

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedules of Restricted Stock and Restricted Stock Unit Activity

The following table summarizes restricted stock award activities for the nine months ended September 30, 2024:


		Weighted Average
		Grant Date Fair
	Number of Shares	Value
Nonvested at December 31, 2023	64,706	$	11.59
Vested	(4,595)		54.45
Nonvested at September 30, 2024	60,111	$	8.32

Restricted stock units

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedules of Restricted Stock and Restricted Stock Unit Activity


		Weighted Average
		Grant Date Fair
	Number of Units	Value
Nonvested at December 31, 2023	95,197	$	18.78
Forfeited	(64,892)		18.19
Vested	(18,926)		23.26
Nonvested at September 30, 2024	11,379	$	14.69

Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2024

Net Loss per Share

Schedule of Potentially Dilutive Securities


	For the nine months ended September 30,
	2024	2023
Warrants	60,957,004	70,102
Options	76,112	76,112
Class A Preferred Shares	250,000	250,000
Unvested restricted stock awards	60,111	64,706
Unvested restricted stock units	11,379	106,100
Total	61,354,606	567,020

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies

Schedule of information about operating leases


	For the Nine Months Ended
		September 30,		September 30,
($ in thousands)	2024		2023
Lease cost
Operating lease cost	$	113	$	592
Variable lease cost		149		544
Total	$	262	$	1,136


	For the Nine Months Ended
		September 30,			September 30,
($ in thousands)	2024			2023
Operating cash flows from operating leases	$	406		$	395
Gain on lease modification	$	314		$	220
Weighted-average remaining lease term – operating leases		2.0			4.7
Weighted-average discount rate – operating leases		9.0	%		9.1	%

Schedule of Maturities of operating leases excluding short term leases


($ in thousands)	Future Lease Liability
Three months ended December 31, 2024	$	127
Year ended December 31, 2025		516
Year ended December 31, 2026		439
Total		1,082
Less present value discount		(99)
Operating lease liabilities	$	983

Organization, Description of Business and Liquidity and Capital Resources (Details) - USD ($) $ in Thousands		1 Months Ended
	Apr. 12, 2024	Apr. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Accumulated deficit			$ (395,771)	$ (380,971)
Number of positions eliminated period percent	81.00%	81.00%

Significant Accounting Policies (Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	$ 3,525	$ 6,234	$ 9,562
Restricted cash	375	750	750
Total cash, cash equivalents and restricted cash	3,900	$ 6,984	$ 10,312	$ 76,656
Assets held for sale, not discontinued operations
Property, plant and equipment, held for sale	$ 2,200

Clinical Trial and Sponsored Research Agreements (Details) - Clinical trial and sponsored research agreements - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	$ 66	$ 364	$ 301	$ 3,739
Mayo Clinic
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	0	(275)	551
CD123 (MB-102) \| City of Hope National Medical Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	23	0	23
IL13Ra2 (MB-101) \| City of Hope National Medical Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	66	180	457	817
CS1 (MB-104) \| City of Hope National Medical Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	0	0	188
PSCA (MB-105) \| City of Hope National Medical Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	0	0	44
CD20 (MB-106) \| Fred Hutchinson Cancer Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	142	312	1,239
ST. Jude - XSCID \| St. Jude Children's Research Hospital
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	0	(106)	(434)	528
RAG1 SCID (MB-110) \| Leiden University Medical Center
License, Clinical Trial and Sponsored Research Agreements
Research and development for sponsored research and clinical trial agreements	$ 0	$ 125	$ 241	$ 349

Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended							3 Months Ended		9 Months Ended
	Jul. 03, 2017	Jun. 30, 2024	Apr. 30, 2024	Nov. 30, 2022	Jan. 31, 2022	Nov. 30, 2020	Oct. 31, 2020	Feb. 28, 2017	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
License, Clinical Trial and Sponsored Research Agreements
Research and development expense									$ 57	$ 9,527	$ 8,221	$ 34,363
Research and development
License, Clinical Trial and Sponsored Research Agreements
Forgiveness of all amounts previously owed											$ 900
Mayo Clinic
License, Clinical Trial and Sponsored Research Agreements
Forgiveness of all amounts previously owed		$ 300
St. Jude Children's Research Hospital
License, Clinical Trial and Sponsored Research Agreements
Forgiveness of all amounts previously owed			$ 600
IL13Ra2 CAR and (C134)
License, Clinical Trial and Sponsored Research Agreements
Research and development expense				$ 600			$ 300
Clinical trial and sponsored research agreements \| IL13Ra2 (MB-101) \| City of Hope National Medical Center
License, Clinical Trial and Sponsored Research Agreements
Contribution toward patient costs								$ 100
Contribution per patient							100
Annual maintenance fee payable							$ 200
Clinical trial and sponsored research agreements \| CD20 (MB-106) \| Fred Hutchinson Cancer Center
License, Clinical Trial and Sponsored Research Agreements
Contribution toward patient costs						$ 800
Milestones payable	$ 5,300
Additional milestone payments					$ 2,200	$ 1,800
Clinical trial and sponsored research agreements \| CD20 (MB-106) \| Fred Hutchinson Cancer Center \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Additional milestone payments					$ 9,300

Related Party Agreements (Narrative) (Details) - Fortress Biotech, Inc - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 02, 2024	Jul. 22, 2016	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Shares issued for services (in shares)	353,086
Parent Company \| Management Services Agreement (MSA)
Related Party Transaction [Line Items]
Percentage of annual fees expense related to Management Services Agreement recorded in research and development expenses			50.00%	50.00%	50.00%	50.00%
Percentage of annual fees expense related to Management Services Agreement recorded in general and administrative expenses			50.00%	50.00%	50.00%	50.00%
Expenses from related party transaction			$ 100,000	$ 100,000	$ 400,000	$ 400,000
Parent Company \| Founders Agreement
Related Party Transaction [Line Items]
Shares issued for services (in shares)					641,740
Percentage of fully diluted equity	2.50%	2.50%
Expenses from related party transaction			$ 29,000	$ 4,000	$ 200,000	$ 4,000
Research and development for licenses acquired							$ 500,000

Assets Purchase Agreements (Details) $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
Assets Purchase Agreements (Details) $ in Thousands	Jun. 27, 2024 USD ($)	May 13, 2024 item	Jul. 28, 2023 USD ($)	Jul. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Asset Acquisition [Line Items]
Proceeds from the sale of property and equipment							$ 0	$ 6,000
Gain on sale of property and equipment					$ 0	$ 1,351	0	$ 1,351
Property, plant and equipment, held for sale					$ 2,209		2,209		$ 0
June 2024 Repurchase of Assets
Asset Acquisition [Line Items]
Purchase price	$ 1,400
Upfront payment	$ 100			$ 100
Upfront payment, due period from Effective Date	5 days
Subsequent payment	$ 1,300						$ 1,300
Subsequent amount, due period from closing date	12 months
Amount of net assets below this threshold, the Company may elect to delay payment obligation by additional six months	$ 20,000
Extension term for deferred payment	6 months
Interest rate on outstanding Deferred Amount	5.00%
Rate of interest accrual on Deferred Amount not paid in full after 12 months	12 months
Amount of net receivables to forgive under Asset Purchase Agreement	$ 3,300
Outstanding receivables	6,900
Outstanding payables	3,600
Total purchase consideration	4,700
Fair value provided from valuation services less costs to sell	2,200
Purchase consideration allocated to the supplies repurchased	2,500
Supplies repurchased with no alternate future use recognized as research and development expense	2,200
Supplies repurchased with alternate future use recognized as research and development expense	300
Property, plant and equipment, held for sale	$ 2,200
uBriGene
Asset Acquisition [Line Items]
Proceeds from the sale of property and equipment			$ 6,000
Gain on sale of property and equipment			1,400
Sale consideration considered deferred income			$ 300
Number of parties obligated to terminate agreements \| item		2
Equipment assets purchased term		180 days

Property, Plant and Equipment, and Asset Impairment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property and Equipment
Total property, plant and equipment	$ 7,694	$ 7,723
Less: impairment loss	(2,176)
Less: accumulated depreciation	(5,097)	(4,476)
Property, plant and equipment, net	$ 421	$ 3,247
Leasehold improvements
Property and Equipment
Estimated useful life	9 years	9 years
Total property, plant and equipment	$ 7,694	$ 7,694
Construction in process
Property and Equipment
Total property, plant and equipment		$ 29

Property, Plant and Equipment, and Asset Impairment (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment, and Asset Impairment
Depreciation expense	$ 100		$ 300	$ 620	$ 1,576
Asset impairment	$ 0	$ 2,600	$ 0	$ 2,649	$ 0
Impairment of leasehold improvements		2,200
Impairment on the right-of-use asset		$ 400

Accounts Payable and Accrued Expenses (Schedule of Accounts Payable and Accrued Expenses) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accounts Payable and Accrued Expenses
Accounts payable	$ 8,759	$ 6,322
Accrued research and development	561	4,118
Accrued compensation	984	2,838
Other	1,757	739
Total accounts payable and accrued expenses	12,061	$ 14,017
Accrued consideration for the uBriGene Asset Purchase Agreement	$ 1,300

Notes Payable (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 11, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest expense		$ 1	$ 4	$ 4	$ 4,112
Amortization of debt discount				$ 0	$ 118
Runway Debt Facility
Payoff amount of debt facility	$ 30,400

Notes Payable - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Notes Payable
Interest expense				$ 1,187
Amortization of Debt Discount				118
Loss on Extinguishment			$ 0	2,796
Other			4	11
Total Interest Expense	$ 1	$ 4	$ 4	$ 4,112

Stockholders' Equity (Registration Statements and At-the-Market Offering) (Details)		9 Months Ended
	May 24, 2021 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Jun. 12, 2024 USD ($)	May 31, 2024	Jul. 31, 2018
Stockholders' Equity
Proceeds from issuance of common shares		$ 5,944,000	$ 163,000
Aggregate fees of stock issuance		$ 784,000	$ 3,000
Stockholders' Equity Note, Stock Split, Conversion Ratio			15
At the Market Offering
Stockholders' Equity
Issuance of common shares (in shares) \| shares		2,700,000	52,000
Agent commission (as a percent)					3.00%	3.00%
Price per common stock \| $ / shares		$ 0.44	$ 3.15
Proceeds from issuance of common shares		$ 1,200,000	$ 200,000
Aggregate fees of stock issuance		45,000	$ 3,000
2021 S-3
Stockholders' Equity
Sale of Stock aggregate offering price	$ 200,000,000.0
Issuance of common shares (in shares) \| shares	4,400,000
2024 S-3
Stockholders' Equity
Sale of Stock aggregate offering price				$ 40,000,000.0
Shares available for future issuance		$ 36,300,000

Stockholders' Equity - May 2024 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 29, 2024	Sep. 30, 2024	May 31, 2024	Dec. 31, 2023	Oct. 26, 2023
Stockholders' Equity
Exercise price of warrant		$ 0.29		$ 1.34
Prefunded Warrants
Stockholders' Equity
Warrants issued		3,105,000	15,717,638		1,668,236
May 2024 Equity Offering
Stockholders' Equity
Number of common stock agreed to issue and sell	1,160,000
Warrants issued			50,632,914
Price per share	$ 0.2369
Net proceeds of offering	$ 3.2
May 2024 Equity Offering \| Existing Warrants
Stockholders' Equity
Warrants issued	2,588,236
Exercise price of warrant	$ 1.58
Warrants expiration term	5 years
May 2024 Equity Offering \| Existing Warrants \| Minimum
Stockholders' Equity
Exercise price of warrant	$ 0.237
May 2024 Equity Offering \| Series A-3 Warrant
Stockholders' Equity
Warrants issued	16,877,638
Number of warrant to converted	1
Number of common stock, each warrant get converted	1
Warrants expiration term	9 months
May 2024 Equity Offering \| Series A-2 Warrant
Stockholders' Equity
Warrants issued	16,877,638
Number of warrant to converted	1
Number of common stock, each warrant get converted	1
Warrants expiration term	24 months
May 2024 Equity Offering \| Series A-1 Warrant
Stockholders' Equity
Warrants issued	16,877,638
Number of warrant to converted	1
Number of common stock, each warrant get converted	1
Warrants expiration term	5 years
May 2024 Equity Offering \| Prefunded Warrants
Stockholders' Equity
Warrants issued	15,717,638
Exercise price of warrant	$ 0.0001
Price per warrant	$ 0.237

Stockholders' Equity - June 2024 Registered Direct Offering (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 21, 2024	Jun. 19, 2024	Jun. 18, 2024	Sep. 30, 2024	May 31, 2024	Dec. 31, 2023	Oct. 26, 2023
Class of Stock [Line Items]
Exercise price of warrant				$ 0.29		$ 1.34
Prefunded Warrants
Class of Stock [Line Items]
Warrants issued				3,105,000	15,717,638		1,668,236
June 2024 Registered Direct Offering
Class of Stock [Line Items]
Issuance of common shares (in shares)		3,025,000
Price per common stock		$ 0.41
Proceeds for general corporate purposes and working capital requirements	$ 2.1
June 2024 Registered Direct Offering \| Prefunded Warrants
Class of Stock [Line Items]
Warrants issued		3,105,000
Price per warrant		$ 0.4099
Amount per share to be reduced from offering price		0.0001
Exercise price of warrant		$ 0.0001
Private Placement \| Private Placement Warrants
Class of Stock [Line Items]
Warrants issued		6,130,000
Price per warrant		$ 0.41
Exercise price of warrant		$ 0.41
Number of common stock, each warrant get converted		1
Warrants expiration term		5 years
Private Placement \| Wainwright Warrants
Class of Stock [Line Items]
Warrants issued			367,800
Purchase Price of Common Stock, Percentage			125.00%
Exercise price of warrant			$ 0.5125
Warrants expiration term			5 years

Stockholders' Equity (Equity Incentive Plans and Employee Stock Purchase Plan) (Details) - shares	1 Months Ended				9 Months Ended	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2018	Sep. 30, 2024	Dec. 31, 2016	Dec. 31, 2019
Stockholders' Equity
Shares authorized							26,667
Additional shares authorized	400,000		40,000
Shares available for grant	466,667
Predetermined offering period, lower fair market value percentage					85.00%
Number of shares purchased under ESPP					128,352
Shares available for future sale					338,315
Employee Stock Option
Stockholders' Equity
Shares authorized						133,333
Expiration period						10 years
Additional shares authorized		200,000	200,000	200,000
Shares available for grant		733,333	533,333	333,333
Shares available for future sale					397,723

Stockholders' Equity (Stock Option Activities) (Details) - Employee Stock Option - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Options rollforward
Stock Options, Outstanding, Number, Beginning Balance	76,112
Options, Outstanding, Number, Ending Balance	76,112	76,112
Options vested and exercisable	47,570
Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning	$ 85.95
Weighted Average Exercise Price, Ending	85.95	$ 85.95
Weighted Average Exercise Price, options vested and exercisable	$ 85.95
Weighted Average Remaining Contractual Life, Options outstanding (in years)	2 years 6 months 21 days	3 years 3 months 21 days
Weighted Average Remaining Contractual Life, Options vested and exercisable (in years)	2 years 6 months 21 days
Unrecognized share-based compensation	$ 0

Stockholders' Equity (Restricted Stock or Restricted Units Awards) (Details) - USD ($)		1 Months Ended	9 Months Ended
	Apr. 12, 2024	Apr. 30, 2024	Sep. 30, 2024
Weighted Average Grant Date Fair Value
Number of positions eliminated period percent	81.00%	81.00%
Restricted stock award
Restricted stock and RSU rollforward
Nonvested, Number, Beginning Balance			64,706
Vested			(4,595)
Nonvested, Number, Ending Balance			60,111
Weighted Average Grant Date Fair Value
Nonvested, Beginning Balance			$ 11.59
Vested			54.45
Nonvested, Ending Balance			$ 8.32
Unrecognized share-based compensation			$ 200,000
Weighted average vesting period (in years)			1 year 3 months 18 days
Restricted stock units
Restricted stock and RSU rollforward
Nonvested, Number, Beginning Balance			95,197
Forfeited			(64,892)
Vested			(18,926)
Nonvested, Number, Ending Balance			11,379
Weighted Average Grant Date Fair Value
Nonvested, Beginning Balance			$ 18.78
Forfeited			18.19
Vested			23.26
Nonvested, Ending Balance			$ 14.69
Unrecognized share-based compensation			$ 38,000
Weighted average vesting period (in years)			1 year 9 months 18 days

Stockholders' Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Total stock-based compensation expense	$ 42	$ 100	$ (500)	$ 380
General and administrative
Total stock-based compensation expense	52	119	150	381
Research and development
Total stock-based compensation expense	$ (10)	$ (19)	$ (650)	$ (1)

Stockholders' Equity (Warrants Activity) (Details) - $ / shares	1 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Apr. 29, 2024	Oct. 26, 2023
Stockholders' Equity
Warrants outstanding, beginning		4,481,868
Warrants exercised		(20,490,874)
Warrants granted		76,966,010
Warrants outstanding, ending		60,957,004	4,481,868
Warrant exercise price (in dollars per share)		$ 0.29	$ 1.34
Warrant exercise price, grants during the period (in dollars per share)		$ 0.19
Warrants outstanding, remaining contractual life		2 years 8 months 23 days	5 years 4 months 2 days
Warrants granted, remaining contractual life		2 years 6 months
May 2024 Equity Offering
Stockholders' Equity
Warrants issued	50,632,914
Prefunded Warrants
Stockholders' Equity
Warrants issued	15,717,638	3,105,000			1,668,236
Prefunded Warrants \| May 2024 Equity Offering
Stockholders' Equity
Warrant exercise price (in dollars per share)				$ 0.0001
Warrants issued				15,717,638
Prefunded Warrants \| October Registered Direct Offering
Stockholders' Equity
Warrant exercise price (in dollars per share)		$ 0.001
Warrants issued		1,668,236
Prefunded Warrants \| May and June Registered Direct Offering
Stockholders' Equity
Warrant exercise price (in dollars per share)		$ 0.0001
Warrants issued		18,822,638
Unregistered Warrants
Stockholders' Equity
Warrants outstanding, ending	2,588,236
Warrant exercise price (in dollars per share)	$ 1.58
Warrant exercise price, exercised during the period (in dollars per share)	$ 0.237
Warrants issued		6,130,000			2,588,236
Placement Agents Warrants
Stockholders' Equity
Warrants issued	1,012,658	367,800			155,294

Net Loss per Share (Potentially Dilutive Securities) (Details) - shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	61,354,606	567,020
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	60,957,004	70,102
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	76,112	76,112
Class A Preferred Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	250,000	250,000
Unvested restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	60,111	64,706
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	11,379	106,100

Commitments and Contingencies (Narrative) (Details) - USD ($)	Jun. 28, 2024	Sep. 30, 2024	Dec. 31, 2023
Commitments and Contingencies
Termination fee	$ 40,000
Operating lease liability		$ 983,000	$ 2,500,000
Operating lease right-of-use asset, net		$ 92,000	$ 1,566,000

Commitments and Contingencies (Schedule of Operating Leases) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Lease cost
Operating lease cost	$ 113	$ 592
Variable lease cost	149	544
Total	$ 262	$ 1,136

Commitments and Contingencies (Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Commitments and Contingencies
Operating cash flows from operating leases	$ 406	$ 395
Gain on lease modification	$ 314	$ 220
Weighted-average remaining lease term - operating leases	2 years	4 years 8 months 12 days
Weighted-average discount rate - operating leases	9.00%	9.10%

Commitments and Contingencies (Maturities of Operating Leases) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Commitments and Contingencies
Three months ended December 31, 2024	$ 127
Year ended December 31, 2025	516
Year ended December 31, 2026	439
Total	1,082
Less present value discount	(99)
Operating lease liabilities	$ 983	$ 2,500

Subsequent Events (Details) - USD ($)		9 Months Ended
Subsequent Events (Details) - USD ($)	Oct. 25, 2024	Sep. 30, 2024	Sep. 30, 2023	Oct. 24, 2024	May 31, 2024	Dec. 31, 2023	Oct. 26, 2023
Subsequent Events
Warrant exercise price (in dollars per share)		$ 0.29				$ 1.34
Proceeds from exercise of warrants		$ 3,000	$ 0
Placement Agents Warrants
Subsequent Events
Warrants issued		367,800			1,012,658		155,294
Subsequent event \| Series A-3 Warrant
Subsequent Events
Warrants issued				16,877,638
Warrant exercise price (in dollars per share)				$ 0.237
Proceeds from exercise of warrants	$ 4,000,000.0
Cash fee as percentage of aggregate gross proceeds	7.00%
Legal fees and other expenses, reimbursed	$ 50,000
Non accountable expenses, reimbursed	$ 25,000
Management fee as percentage of gross proceeds	1.00%
Subsequent event \| Series B1 Warrant
Subsequent Events
Warrants issued				16,877,638
Warrant exercise price (in dollars per share)				$ 0.27
Warrants expiration term				5 years
Subsequent event \| Series B2 Warrant
Subsequent Events
Warrants issued				16,877,638
Warrant exercise price (in dollars per share)				$ 0.27
Warrants expiration term				12 months
Subsequent event \| Placement Agents Warrants
Subsequent Events
Warrants issued	1,012,658
Warrant exercise price (in dollars per share)	$ 0.2963

Mustang Bio (NASDAQ:MBIO)
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Mustang Bio (NASDAQ:MBIO)
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