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

Table of Contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)


☑						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: 001-39277

MP MATERIALS CORP.

(Exact name of registrant as specified in its charter)


Delaware						84-4465489
(State or other jurisdiction of incorporation or organization)						(I.R.S. Employer Identification No.)

1700 S. Pavilion Center Drive, Suite 800

Las Vegas, Nevada 89135

(702) 844-6111

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 of $0.0001 per share	MP	New York Stock Exchange

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, a 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 the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

As of October 31, 2024, the number of shares of the registrant’s common stock outstanding was 163,207,224.

MP MATERIALS CORP. AND SUBSIDIARIES

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			Page
PART I—FINANCIAL INFORMATION
Item 1. Financial Statements			1
Condensed Consolidated Balance Sheets (unaudited)			1
Condensed Consolidated Statements of Operations (unaudited)			2
Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited)			3
Condensed Consolidated Statements of Changes in Stockholders’ Equity (unaudited)			4
Condensed Consolidated Statements of Cash Flows (unaudited)			5
Notes to Condensed Consolidated Financial Statements (unaudited)			6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations			23
Item 3. Quantitative and Qualitative Disclosures About Market Risk			37
Item 4. Controls and Procedures			37

PART II—OTHER INFORMATION
Item 1. Legal Proceedings			37
Item 1A. Risk Factors			37
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds			38

Item 4. Mine Safety Disclosures			38
Item 5. Other Information			38
Item 6. Exhibits			39
Signatures			40

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References herein to the “Company,” “MP Materials,” “we,” “our,” and “us,” refer to MP Materials Corp. and its subsidiaries.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements included in this Quarterly Report on Form 10-Q for the three months ended September 30, 2024 (this “Form 10-Q”), that are not historical facts are forward-looking statements under Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements may be identified by the use of the words such as “estimate,” “plan,” “shall,” “may,” “project,” “forecast,” “intend,” “expect,” “anticipate,” “believe,” “seek,” “target,” or similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding estimates and forecasts of other financial and performance metrics and projections of market opportunity. These statements are based on various assumptions, whether or not identified in this Form 10-Q or our Annual Report on Form 10-K for the year ended December 31, 2023 (the “Form 10-K”), and on the current expectations of our management and are not predictions of actual performance. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on by any investor as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond our control.

These forward-looking statements are subject to a number of risks and uncertainties, including:

•fluctuations and uncertainties related to demand for and pricing of rare earth products;

•uncertainties regarding the growth of existing and emerging uses for rare earth products and ability to compete with substitutions for such products;

•the intense competition within the rare earth mining and processing industry;

•uncertainties relating to our commercial arrangements with Shenghe Resources (Singapore) International Trading Pte. Ltd., an affiliate of Shenghe Resources Holding Co., Ltd., a global rare earth company listed on the Shanghai Stock Exchange;

•potential changes in China’s political environment and policies;

•unanticipated costs or delays associated with the ramp-up of our Stage II optimization project;

•unanticipated costs or delays associated with our Stage III project;

•risks associated with our intellectual property rights, including uncertainties related to the Company’s ability to obtain the intellectual property rights or licenses of intellectual property rights to produce NdFeB magnets and precursor materials;

•uncertainties related to the Company’s ability to produce and supply NdFeB magnets and precursor materials;

•the ability to convert current commercial discussions with customers for the sale of rare earth oxide and metal products, NdFeB magnets and other products into contracts;

•potential power shortages and interruptions at the Mountain Pass Rare Earth Mine and Processing Facility;

•increasing costs or limited access to raw materials that may adversely affect our profitability;

•fluctuations in transportation costs or disruptions in transportation services;

•inability to meet individual customer specifications;

•diminished access to water;

•regulatory and business risks associated with the Company’s investment in VREX Holdco Pte. Ltd.;

•uncertainty in our estimates of rare earth oxide reserves;

•risks associated with work stoppages;

•a shortage of skilled technicians and engineers;

•loss of key personnel;

•risks associated with the inherent dangers involved in mining activity and manufacturing of magnet materials;

•risks associated with events outside of our control, such as natural disasters, climate change, wars or health epidemics or pandemics;

•risks related to technology systems and security breaches;

•ability to maintain satisfactory labor relations;

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•ability to comply with various government regulations that are applicable to our business;

•ability to maintain our governmental licenses, registrations, permits, and approvals with numerous governmental agencies necessary for us to operate our business;

•risks relating to extensive and costly environmental regulatory requirements;

•risks associated with the terms of our Convertible Notes and Capped Call Options (as defined in Note 10, “Debt Obligations”);

•risks associated with our share repurchase program and whether it will be fully consummated or that our share repurchase program will enhance long-term stockholder value; and

•the other factors described elsewhere in this Form 10-Q, included under the headings “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Part II, Item 1A, “Risk Factors” or as described in our Form 10-K or as described in our Form 10-Q for the quarterly period ended March 31, 2024 (the “First Quarter Form 10-Q”), or as described in the other documents and reports we file with the Securities and Exchange Commission.

If any of these risks materialize or our assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements.

These and other factors that could cause actual results to differ from those implied by the forward-looking statements in this Form 10-Q are more fully described within Part II, Item 1A, “Risk Factors” in this Form 10-Q and “Part I, Item 1A. Risk Factors” in our Form 10-K and Part II, Item 1A. “Risk Factors” in our First Quarter Form 10-Q. Such risks are not exhaustive. New risk factors emerge from time to time, and it is not possible to predict all such risk factors, nor can we assess the impact of all such risk factors on our business or the extent to which any factor or combination of factors may cause actual results to differ materially from those contained in any forward-looking statements. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the foregoing cautionary statements. We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

In addition, statements of belief and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us, as applicable, as of the date of this Form 10-Q, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain, and you are cautioned not to unduly rely upon these statements.

iii

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PART I—FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MP MATERIALS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)



(in thousands, except share and per share data)	September 30, 2024		December 31, 2023
Assets
Current assets
Cash and cash equivalents	$	284,434	$	263,351
Short-term investments	582,056		734,493
Total cash, cash equivalents and short-term investments	866,490		997,844
Accounts receivable, net of allowance for credit losses of $0 and $0, respectively (including related party)	14,549		10,029
Inventories	116,699		95,182

Government grant receivable	7,846		19,302
Prepaid expenses and other current assets	11,599		8,820
Total current assets	1,017,183		1,131,177
Non-current assets
Property, plant and equipment, net	1,230,517		1,158,054
Operating lease right-of-use assets	9,004		10,065
Inventories	19,825		13,350
Equity method investment	8,962		9,673
Intangible assets, net	7,970		8,881
Other non-current assets	6,825		5,252
Total non-current assets	1,283,103		1,205,275
Total assets	$	2,300,286	$	2,336,452
Liabilities and stockholders’ equity
Current liabilities
Accounts and construction payable	$	21,711	$	27,995
Accrued liabilities	66,224		73,939

Deferred revenue	50,000		—
Other current liabilities	8,854		6,616
Total current liabilities	146,789		108,550
Non-current liabilities
Asset retirement obligations	5,856		5,518
Environmental obligations	16,506		16,545
Long-term debt, net	937,634		681,980
Operating lease liabilities	6,016		6,829
Deferred government grant	19,836		17,433
Deferred income taxes	98,541		130,793
Other non-current liabilities	4,568		3,025
Total non-current liabilities	1,088,957		862,123
Total liabilities	1,235,746		970,673
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock ($0.0001 par value, 50,000,000 shares authorized, none issued and outstanding in either period)	—		—
Common stock ($0.0001 par value, 450,000,000 shares authorized, 178,439,486 and 178,082,383 shares issued, and 163,189,704 and 178,082,383 shares outstanding, as of September 30, 2024, and December 31, 2023, respectively)	18		17
Additional paid-in capital	948,687		979,891
Retained earnings	342,644		385,726
Accumulated other comprehensive income	296		145
Treasury stock, at cost, 15,249,782 and 0 shares, respectively	(227,105)		—
Total stockholders’ equity	1,064,540		1,365,779
Total liabilities and stockholders’ equity	$	2,300,286	$	2,336,452

See accompanying notes to the Condensed Consolidated Financial Statements.

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MP MATERIALS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands, except share and per share data)	2024		2023		2024		2023
Revenue:
Rare earth concentrate (including related party)	$	43,053	$	52,472	$	107,555	$	212,139
NdPr oxide and metal (including related party)	19,179		—		34,037		—
Other revenue	695		44		1,277		101
Total revenue	62,927		52,516		142,869		212,240

Operating costs and expenses:
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	57,266		22,217		134,323		69,137
Selling, general and administrative	21,525		19,561		64,226		57,829
Depreciation, depletion and amortization	19,344		16,751		55,939		37,076
Start-up costs	1,627		7,336		4,287		16,125
Advanced projects and development	2,051		2,873		8,143		9,586


Other operating costs and expenses	654		1,314		1,415		6,578
Total operating costs and expenses	102,467		70,052		268,333		196,331
Operating income (loss)	(39,540)		(17,536)		(125,464)		15,909
Interest expense, net	(6,646)		(1,396)		(16,248)		(4,147)
Gain on early extinguishment of debt	—		—		46,265		—
Other income, net	11,320		14,456		36,061		41,970
Income (loss) before income taxes	(34,866)		(4,476)		(59,386)		53,732
Income tax benefit (expense)	9,350		200		16,304		(13,166)
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566

Earnings (loss) per share:
Basic	$	(0.16)	$	(0.02)	$	(0.26)	$	0.23
Diluted	$	(0.16)	$	(0.02)	$	(0.44)	$	0.22

Weighted-average shares outstanding:
Basic	164,149,348		177,231,717		168,002,773		177,034,068
Diluted	164,149,348		177,231,717		172,066,214		193,632,662

See accompanying notes to the Condensed Consolidated Financial Statements.

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MP MATERIALS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(UNAUDITED)


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Other comprehensive income (loss), net of tax:

Change in net unrealized gains (losses) on available-for-sale securities	388		134		203		(221)


Foreign currency translation loss	(2)		—		(52)		—
Total comprehensive income (loss)	$	(25,130)	$	(4,142)	$	(42,931)	$	40,345

See accompanying notes to the Condensed Consolidated Financial Statements.

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MP MATERIALS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(UNAUDITED)


	Three months ended September 30, 2024 and 2023
	Preferred Stock			Common Stock			Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Treasury Stock		Total Stockholders’ Equity
(in thousands, except share data)	Shares	Amount		Shares	Amount
Balance as of July 1, 2024	—	$	—	165,331,382	$	18	$	943,508	$	368,160	$	(90)	$	(202,558)	$	1,109,038
Stock-based compensation	—	—		83,850	—		5,632		—		—		—		5,632
Shares used to settle payroll tax withholding	—	—		(31,707)	—		(453)		—		—		—		(453)
Repurchases of common stock	—	—		(2,237,394)	—		—		—		—		(24,547)		(24,547)

Common stock issued to acquire intangible asset	—	—		43,573	—		—		—		—		—		—

Net loss	—	—		—	—		—		(25,516)		—		—		(25,516)
Other comprehensive income, net of tax	—	—		—	—		—		—		386		—		386
Balance as of September 30, 2024	—	$	—	163,189,704	$	18	$	948,687	$	342,644	$	296	$	(227,105)	$	1,064,540

Balance as of July 1, 2023	—	$	—	177,626,668	$	17	$	958,819	$	406,261	$	(166)	$	—	$	1,364,931
Stock-based compensation	—	—		37,236	—		6,665		—		—		—		6,665
Shares used to settle payroll tax withholding	—	—		(13,808)	—		(344)		—		—		—		(344)
Common stock issued to acquire intangible asset	—	—		152,504	—		8,963		—		—		—		8,963
Net loss	—	—		—	—		—		(4,276)		—		—		(4,276)
Other comprehensive income, net of tax	—	—		—	—		—		—		134		—		134
Balance as of September 30, 2023	—	$	—	177,802,600	$	17	$	974,103	$	401,985	$	(32)	$	—	$	1,376,073

	Nine months ended September 30, 2024 and 2023
	Preferred Stock			Common Stock			Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Treasury Stock		Total Stockholders’ Equity
(in thousands, except share data)	Shares	Amount		Shares	Amount
Balance as of January 1, 2024	—	$	—	178,082,383	$	17	$	979,891	$	385,726	$	145	$	—	$	1,365,779
Stock-based compensation	—	—		354,237	1		18,907		—		—		—		18,908
Shares used to settle payroll tax withholding	—	—		(281,370)	—		(4,577)		—		—		—		(4,577)
Repurchases of common stock	—	—		(15,249,782)	—		—		—		—		(227,105)		(227,105)
Common stock issued for services	—	—		240,663	—		3,737		—		—		—		3,737
Common stock issued to acquire intangible asset	—	—		43,573	—		—		—		—		—		—
Capped Call Options related to 2030 Notes	—	—		—	—		(49,271)		—		—		—		(49,271)
Net loss	—	—		—	—		—		(43,082)		—		—		(43,082)
Other comprehensive income, net of tax	—	—		—	—		—		—		151		—		151
Balance as of September 30, 2024	—	$	—	163,189,704	$	18	$	948,687	$	342,644	$	296	$	(227,105)	$	1,064,540

Balance as of January 1, 2023	—	$	—	177,706,608	$	18	$	951,008	$	361,419	$	189	$	—	$	1,312,634
Stock-based compensation	—	—		149,922	—		20,607		—		—		—		20,607
Shares used to settle payroll tax withholding	—	—		(206,434)	(1)		(6,475)		—		—		—		(6,476)
Common stock issued to acquire intangible asset	—	—		152,504	—		8,963		—		—		—		8,963
Net income	—	—		—	—		—		40,566		—		—		40,566
Other comprehensive loss, net of tax	—	—		—	—		—		—		(221)		—		(221)
Balance as of September 30, 2023	—	$	—	177,802,600	$	17	$	974,103	$	401,985	$	(32)	$	—	$	1,376,073

See accompanying notes to the Condensed Consolidated Financial Statements.

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MP MATERIALS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)


	For the nine months ended September 30,
(in thousands)	2024		2023
Operating activities:
Net income (loss)	$	(43,082)	$	40,566
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	55,939		37,076

Accretion of discount on short-term investments	(23,669)		(17,334)
Gain on early extinguishment of debt	(46,265)		—

Stock-based compensation expense	18,623		19,041
Amortization of debt issuance costs	2,864		2,650
Lower of cost or net realizable value reserve	15,085		—

Deferred income taxes	(16,240)		13,156
Other	1,957		1,091
Decrease (increase) in operating assets:
Accounts receivable (including related party)	(4,520)		19,676
Inventories	(42,851)		(25,498)
Government grant receivable	11,456		—

Prepaid expenses, other current and non-current assets	(2,390)		(1,437)
Increase (decrease) in operating liabilities:
Accounts payable and accrued liabilities	(1,303)		8,601
Income taxes payable	—		(21,163)
Deferred revenue	50,000		—
Deferred government grant	4,086		—
Other current and non-current liabilities	3,182		55
Net cash provided by (used in) operating activities	(17,128)		76,480
Investing activities:
Additions to property, plant and equipment	(144,768)		(188,927)
Purchases of short-term investments	(1,150,609)		(705,241)
Proceeds from sales of short-term investments	131,776		461,042
Proceeds from maturities of short-term investments	1,195,202		769,907


Proceeds from government awards used for construction	96		1,050
Net cash provided by investing activities	31,697		337,831
Financing activities:
Proceeds from issuance of long-term debt	747,500		—
Payment of debt issuance costs	(16,149)		—
Payments to retire long-term debt	(428,599)		—
Purchase of capped call options	(65,332)		—
Repurchases of common stock	(225,068)		—
Principal payments on debt obligations and finance leases	(1,738)		(2,101)
Tax withholding on stock-based awards	(4,577)		(6,476)

Net cash provided by (used in) financing activities	6,037		(8,577)
Net change in cash, cash equivalents and restricted cash	20,606		405,734
Cash, cash equivalents and restricted cash beginning balance	264,988		143,509
Cash, cash equivalents and restricted cash ending balance	$	285,594	$	549,243

Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	284,434	$	547,668
Restricted cash, current	811		1,228
Restricted cash, non-current	349		347
Total cash, cash equivalents and restricted cash	$	285,594	$	549,243

See accompanying notes to the Condensed Consolidated Financial Statements.

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MP MATERIALS CORP. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

NOTE 1—DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Description of Business: MP Materials Corp., including its subsidiaries (the “Company” or “MP Materials”), is the largest producer of rare earth materials in the Western Hemisphere. The Company, which is headquartered in Las Vegas, Nevada, owns and operates the Mountain Pass Rare Earth Mine and Processing Facility (“Mountain Pass”), the only rare earth mining and processing site of scale in North America, and is constructing a rare earth metal, alloy and magnet manufacturing facility in Fort Worth, Texas (the “Fort Worth Facility”), where the Company anticipates manufacturing neodymium-iron-boron (“NdFeB”) permanent magnets and its precursor products.

The Company produces rare earth concentrate products as well as refined rare earth oxides and related products. The rare earth concentrate is principally sold pursuant to the Offtake Agreements to Shenghe (as such terms are defined in Note 19, “Related-Party Transactions”), a related party of the Company, that, in turn, typically sells that product to refiners in China. In the second half of 2023, the Company began producing and selling separated rare earth products, including neodymium-praseodymium (“NdPr”) oxide. Additionally, the Company has a long-term agreement with General Motors Company (NYSE: GM) (“GM”) to supply U.S.-sourced and manufactured rare earth materials and finished magnets for the electric motors in more than a dozen GM models. In April 2024, pursuant to the long-term supply agreement with GM, the Company received a $50.0 million initial prepayment for magnetic precursor materials. See Note 2, “Significant Accounting Policies,” and Note 14, “Revenue Recognition,” for additional details.

Operating segments are defined as components of an enterprise engaged in business activities, about which separate financial information is available and evaluated regularly by the chief operating decision maker (“CODM”), or decision-making group, in deciding how to allocate resources and in assessing performance. The Company’s CODM views the Company’s operations and manages the business as one reportable segment.

The cash flows and profitability of the Company’s operations are significantly affected by the market price of rare earth products. The prices of rare earth products are affected by numerous factors beyond the Company’s control. The products of the Company are sold globally, with a primary focus in the Asian market due to the refining, metallization, and magnet manufacturing capabilities of the region. Rare earth products are critical inputs in hundreds of existing and emerging clean-tech applications including electric vehicles and wind turbines as well as robotics, drones, and defense applications.

Basis of Presentation: The unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, since they are interim statements, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

Results of operations and cash flows for the interim periods presented herein are not necessarily indicative of the results that would be achieved during a full year of operations or in future periods. These unaudited Condensed Consolidated Financial Statements and notes thereto should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Form 10-K.

NOTE 2—SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation: The unaudited Condensed Consolidated Financial Statements include the accounts of MP Materials Corp. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates: The preparation of the unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect (i) the reported amounts of assets and liabilities, (ii) the disclosure of contingent assets and liabilities at the date of the unaudited Condensed Consolidated Financial Statements, and (iii) the reported amounts of revenues and expenses during the reporting period. Accordingly, actual results may differ from those estimates.

Concentration of Risk: Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents and short-term investments, and receivables from customers. The Company believes that its credit risk is limited because the Company’s current contracts are with companies that have a reliable payment history. The Company does

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not believe that it is exposed to any significant risks related to its cash accounts, money market funds, or short-term investments.

For the nine months ended September 30, 2024 and 2023, Shenghe was the Company’s principal customer and accounted for more than 80% and 90% of revenue, respectively. Rare earth concentrate is not quoted on any major commodities market or exchange and demand for rare earth concentrate is currently constrained to a relatively limited number of refiners, a significant majority of which are based in China. Uncertainty exists as to the market price of rare earth oxide (“REO”), as evidenced by the volatility experienced in 2022 and 2023 primarily due to concerns over the global economic conditions and actual or perceived concerns over increases in the supply of or slower growth in the demand for rare earth products. Furthermore, while revenue is generated in the U.S., Shenghe conducts its primary operations in China and may transport and sell products in the Chinese market. Therefore, the Company’s revenue is affected by Shenghe’s ultimate realized prices in China, including the impact of changes in the exchange rate between the Chinese yuan and the U.S. dollar. In addition, the ongoing economic conflict between China and the U.S., which has previously resulted in tariffs and trade barriers, may negatively affect the Company’s business and results of operations. See Note 19, “Related-Party Transactions,” for additional information.

Deferred Revenue: Deferred revenue represents the Company’s obligation to transfer goods or services to a customer for which the Company has received consideration in advance of such transfer. Amounts expected to be recognized as revenue during the 12-month period after the balance sheet date are classified as current deferred revenue with the remainder classified as non-current in the Company’s unaudited Condensed Consolidated Balance Sheets. See “Contract Balances” in Note 14, “Revenue Recognition,” for additional information.

Investment Tax Credits: An investment tax credit (“ITC”) represents a benefit provided by federal, state, or local governments to encourage an entity to invest in specific types of assets. An ITC is commonly calculated as a percentage of the investment cost of a qualifying asset and may be subject to the scope of Accounting Standards Codification (“ASC”) Topic 740, “Income Taxes” (“ASC 740”). The accounting for an ITC may depend upon certain factors, including whether or not the ITC is refundable and/or transferable. The Company elected to account for its nonrefundable, transferable ITCs under ASC 740. This type of ITC is recognized when the Company places into service a qualifying asset and determines that it will more-likely-than-not comply with the requirements to receive the ITC. Additionally, the Company elected to account for these ITCs under the deferral method whereby the Company will initially record such ITC as a deferred liability and subsequently recognize the ITC in the income statement as a reduction to income tax expense over the useful lives of the qualifying assets. As a result of the deferral method, the Company also elected to recognize immediately in income tax expense the deferred tax effect, net of any valuation allowance, as a result of such transaction. See also No te 12, “Income Taxes.”

Capped Call Options: The Company’s Capped Call Options cover the aggregate number of shares of its common stock that initially underlie the 2030 Notes (as such terms are defined in Note 10, “Debt Obligations”), and generally reduce potential dilution to the Company’s common stock upon the conversion of the 2030 Notes and/or offset any cash payments the Company may make in excess of the principal amount of the converted 2030 Notes, as the case may be, with such reduction and/or offset subject to a cap, based on the cap price of the Capped Call Options.

The Company determined that the Capped Call Options meet the definition of a freestanding derivative under ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), but are not required to be separately accounted for as a derivative as they meet the indexation and equity classification scope exception outlined in ASC 815. Accordingly, the Company recognized the cash paid to enter into the Capped Call Options contract during the first quarter of 2024 by recording an entry to “Additional paid-in capital” (“APIC”) in “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets. The Capped Call Options recorded in APIC will not be remeasured each reporting period. See Note 10, “Debt Obligations,” for additional information.

Treasury Stock: Treasury stock represents shares of the Company’s common stock that have been reacquired after having been issued, and is accounted for under the cost method. Treasury stock is excluded from the Company’s outstanding shares and recorded as a reduction of “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets, unless the repurchased shares are immediately retired. Incremental direct costs to purchase treasury stock, such as excise taxes and commission fees, are included in the cost of the shares acquired. As of September 30, 2024, the outstanding balance of the excise tax liability was $2.0 million and was included in “Accrued liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. There was no outstanding excise tax liability balance as of December 31, 2023.

Recently Issued Accounting Pronouncements: During the three and nine months ended September 30, 2024, there were no accounting pronouncements adopted by the Company that had a material impact on the Company’s unaudited Condensed Consolidated Financial Statements. The Company is currently evaluating the effect of adopting Accounting Standards Update

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(“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures,” and ASU No. 2023-09, “Improvements to Income Tax Disclosures,” on its disclosures.

Reclassifications: Certain amounts in prior periods have been reclassified to conform to the current year presentation.

NOTE 3—CASH, CASH EQUIVALENTS AND INVESTMENTS

The following table presents the Company’s cash, cash equivalents and short-term investments:


	September 30, 2024								December 31, 2023
(in thousands)	Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash:
Demand deposits	$	5,406	$	—	$	—	$	5,406	$	2,795	$	—	$	—	$	2,795
Cash equivalents:
Money market funds	118,774		—		—		118,774		61,166		—		—		61,166

U.S. Treasury securities	68,669		13		—		68,682		92,113		14		—		92,127
Commercial paper	84,626		23		—		84,649		93,447		15		—		93,462
Certificates of deposit	6,672		1		—		6,673		13,799		2		—		13,801
Municipal securities	250		—		—		250		—		—		—		—
Total cash equivalents	278,991		37		—		279,028		260,525		31		—		260,556
Total cash and equivalents	284,397		37		—		284,434		263,320		31		—		263,351
Short-term investments:
U.S. agency securities	2,240		—		(1)		2,239		118,370		—		(78)		118,292
U.S. Treasury securities	562,072		429		(8)		562,493		615,962		249		(10)		616,201
Commercial paper	17,320		4		—		17,324		—		—		—		—
Total short-term investments	581,632		433		(9)		582,056		734,332		249		(88)		734,493
Total cash, cash equivalents and short-term investments	$	866,029	$	470	$	(9)	$	866,490	$	997,652	$	280	$	(88)	$	997,844

The Company does not intend to sell, nor is it more likely than not that the Company will be required to sell any investments in unrealized loss positions before recovery of their amortized cost basis. The Company did not recognize any credit losses related to its available-for-sale investments during the three and nine months ended September 30, 2024 and 2023. The unrealized losses on the Company’s available-for-sale investments were primarily due to unfavorable changes in interest rates subsequent to initial purchase. None of the available-for-sale investments held as of September 30, 2024, were in a continuous unrealized loss position for greater than 12 months and the unrealized losses and the related risk of expected credit losses were not material.

The Company recognized the following income and expense amounts, all of which are included in “Other income, net” within the Company’s unaudited Condensed Consolidated Statements of Operations:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Gross realized gains	$	3	$	1	$	6	$	506
Gross realized losses	$	1	$	—	$	15	$	139
Interest and investment income(1)	$	11,759	$	14,455	$	37,031	$	41,607

(1)Includes interest and investment income on the Company’s available-for-sale securities and other money market funds.

As of September 30, 2024, all outstanding available-for-sale investments had contractual maturities within one year and aggregated to a fair value of $742.3 million.

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NOTE 4—INVENTORIES

The Company’s inventories consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Raw materials and supplies, including spare parts(1)	$	46,138	$	42,371
Mined ore stockpiles	30,300		28,507
Work in process	24,695		15,019
Finished goods	15,566		9,285
Total current inventories	116,699		95,182
Add: Non-current portion(2)	19,825		13,350
Total inventories	$	136,524	$	108,532

(1)Includes raw materials to support activities pertaining to the Company’s rare earth metal, alloy and magnet manufacturing capabilities.

(2)Primarily represents stockpiled ore that is not expected to be processed within the next 12 months as well as certain raw materials that are not expected to be consumed within the next 12 months. The stockpiled ore amounts as of September 30, 2024 and December 31, 2023, were $12.0 million and $9.1 million, respectively.

As of September 30, 2024, the Company determined that a lower of cost or net realizable value reserve of $15.1 million was necessary on certain of the Company’s work in process and finished goods inventories, representing a decrease of the reserve of $2.7 million since June 30, 2024. The reserve is largely attributable to elevated carrying costs of the Company’s initial production of separated products given the early stage of ramping the Stage II facilities to normalized production levels. Changes in the reserve are included in “Cost of sales (excluding depreciation, depletion and amortization) (including related party)” within the unaudited Condensed Consolidated Statements of Operations. There were no lower of cost or net realizable value reserves for the three and nine months ended September 30, 2023.

NOTE 5—PROPERTY, PLANT AND EQUIPMENT

The Company’s property, plant and equipment consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Land and land improvements	$	40,254	$	27,091
Buildings and building improvements	95,236		92,203
Machinery and equipment	564,681		503,145
Assets under construction	262,994		211,848
Mineral rights	438,395		438,395
Property, plant and equipment, gross	1,401,560		1,272,682
Less: Accumulated depreciation and depletion	(171,043)		(114,628)
Property, plant and equipment, net	$	1,230,517	$	1,158,054

Additions to Property, Plant and Equipment: The Company capitalized expenditures related to property, plant and equipment of $130.0 million and $199.9 million for the nine months ended September 30, 2024 and 2023, respectively, including amounts not yet paid (see Note 20, “Supplemental Cash Flow Information”). The capitalized expenditures for the nine months ended September 30, 2024 and 2023, related primarily to machinery, equipment and assets under construction to support the Company’s Fort Worth Facility, as well as various projects at Mountain Pass, including the HREE Facility (as defined in Note 15, “Government Grants”). The capitalized expenditures for the nine months ended September 30, 2023, also included assets under construction to support the Company’s Stage II optimization project.

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The Company’s depreciation and depletion expense were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Depreciation expense	$	16,018	$	13,951	$	46,012	$	28,385
Depletion expense	$	2,969	$	2,664	$	8,864	$	8,407

The Company recognized $0.8 million and $5.5 million of demolition costs for the three and nine months ended September 30, 2023, which are included in “Other operating costs and expenses” within the Company’s unaudited Condensed Consolidated Statements of Operations, incurred in connection with demolishing and removing certain old facilities from the Mountain Pass site that have never been used in the Company’s operations. There were no property, plant and equipment impairments recognized for the three and nine months ended September 30, 2024 and 2023. For information on the Company’s asset-based government grants, which impact the carrying amount of the Company’s property, plant and equipment, see Note 15, “Government Grants.”

NOTE 6—EQUITY METHOD INVESTMENT

The Company’s equity method investment balance was $9.0 million and $9.7 million, as of September 30, 2024, and December 31, 2023, respectively, and pertains to the Company’s 49% equity interest in VREX Holdco Pte. Ltd. (“VREX Holdco”). VREX Holdco wholly owns Vietnam Rare Earth Company Limited (“VREX”), which owns and operates a metal processing plant and related facilities in Vietnam. The Company determined that VREX Holdco is a variable interest entity, but that the Company is not the primary beneficiary. Consequently, the Company does not consolidate VREX Holdco, and instead, accounts for its investment in VREX Holdco under the equity method of accounting as it has the ability to exercise significant influence, but not control, over VREX Holdco’s operating and financial policies.

For the three and nine months ended September 30, 2024, the Company recognized $0.3 million and $0.6 million of Company’s share of VREX Holdco’s net loss, respectively, which was included in “Other income, net” within the Company’s unaudited Condensed Consolidated Statements of Operations. As of September 30, 2024, the tolling fees due to VREX Holdco pursuant to the Tolling Agreement (as defined and discussed in Note 19, “Related-Party Transactions,”) and capitalized to inventories that are subject to intra-entity profit or loss elimination were immaterial.

As of September 30, 2024, the Company evaluated its equity method investment for impairment to determine if there were any events or changes in circumstances that would indicate if the carrying amount of its investment had experienced an “other-than-temporary” decline in value. No impairment charges were recorded during the three and nine months ended September 30, 2024.

NOTE 7—INTANGIBLE ASSETS

The Company’s intangible assets were as follows:


	September 30, 2024		December 31, 2023
(in thousands)
Intangible assets with indefinite lives:
Emissions allowances	$	302	$	316
Intangible assets with definite lives:
Patent and intellectual property license	8,963		8,963
Less: Accumulated amortization	(1,295)		(398)
Patent and intellectual property license, net	7,668		8,565
Intangible assets, net	$	7,970	$	8,881

Amortization expense related to amortizing intangible assets was $0.3 million and $0.9 million for the three and nine months ended September 30, 2024, respectively, as compared to $0.1 million for both the three and nine months ended September 30, 2023. No impairment charges were recorded during the three and nine months ended September 30, 2024 and 2023.

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NOTE 8—ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS

Asset Retirement Obligations

The Company estimates asset retirement obligations based on the requirements to reclaim certain land areas associated with mineral extraction activities and certain related facilities at Mountain Pass. Minor reclamation activities related to discrete portions of the Company’s operations are ongoing. As of September 30, 2024, the Company estimated a significant portion of the cash outflows for major reclamation activities including the retirement of Mountain Pass will be incurred beginning in 2056.

As of September 30, 2024, the credit-adjusted risk-free rate ranged between 6.5% and 12.0% depending on the timing of expected settlement and when the increment was recognized. There were no significant increments or decrements for the three and nine months ended September 30, 2024 and 2023.

The balance as of both September 30, 2024 and December 31, 2023, included current portions of $0.2 million, which are included in “Other current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. The total estimated future undiscounted cash flows required to satisfy the Company’s asset retirement obligations were $52.5 million and $50.2 million as of September 30, 2024, and December 31, 2023, respectively.

Environmental Obligations

The Company has certain environmental monitoring and remediation obligations related to the monitoring of groundwater contamination. The Company engaged an environmental consultant to develop a remediation plan and remediation cost projections based upon that plan. Utilizing the consultant’s plan, the Company developed an estimate of future cash payments for the environmental obligations.

As of September 30, 2024, the Company estimated the cash outflows related to these environmental activities will be incurred annually over the next 23 years. The Company’s environmental obligations are measured at the expected value of future cash outflows discounted to their present value using a discount rate of 2.93%. There were no significant changes in the estimated remaining remediation costs for the three and nine months ended September 30, 2024 and 2023.

The total estimated aggregate undiscounted cost of $26.3 million and $26.7 million as of September 30, 2024, and December 31, 2023, respectively, principally related to water monitoring activities required by state and local agencies. Based on the Company’s estimate of the cost and timing and the assumption that payments are considered to be fixed and reliably determinable, the Company has discounted the liability. The balance as of both September 30, 2024, and December 31, 2023, included current portions of $0.5 million, which are included in “Other current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets.

Financial Assurances

The Company is required to provide certain government agencies with financial assurances relating to closure and reclamation obligations. As of September 30, 2024, and December 31, 2023, the Company had financial assurance requirements of $45.5 million and $45.4 million, respectively, which were satisfied with surety bonds placed with applicable California state and regional agencies.

NOTE 9—ACCRUED LIABILITIES

The Company’s accrued liabilities consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Accrued payroll and related	$	16,396	$	14,499
Accrued construction costs	35,258		46,976
Accrued taxes	4,926		3,373
Other accrued liabilities	9,644		9,091
Accrued liabilities	$	66,224	$	73,939

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NOTE 10—DEBT OBLIGATIONS

The Company’s long-term debt, net, was as follows:


	September 30, 2024						December 31, 2023
(in thousands)	Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount		Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount
Convertible Notes due 2026	$	210,000	$	(1,638)	$	208,362	$	690,000	$	(8,020)	$	681,980
Convertible Notes due 2030	747,500		(18,228)		729,272		—		—		—
Total long-term debt outstanding	$	957,500	$	(19,866)	$	937,634	$	690,000	$	(8,020)	$	681,980

Convertible Notes due 2026

In March 2021, the Company issued $690.0 million in aggregate principal amount of 0.25% unsecured convertible senior notes (the “2026 Notes”) at a price of par. Interest on the 2026 Notes is payable on April 1st and October 1st of each year, beginning on October 1, 2021.

Contemporaneous with the pricing of the 2030 Notes (as defined below), the Company entered into privately negotiated transactions with certain holders of the 2026 Notes to repurchase $400.0 million in aggregate principal amount of the 2026 Notes, using $358.0 million of the net proceeds from the offering of the 2030 Notes. The price the Company paid to repurchase the 2026 Notes, 89.5% of par value, was the same for each lender and approximated the trading price of the 2026 Notes at the time of the repurchases. Subsequent to the issuance of the 2030 Notes, the Company repurchased an additional $80.0 million in aggregate principal amount of the 2026 Notes in open market transactions for $70.6 million. As a result of these repurchases in the first quarter of 2024, the Company recorded a $46.3 million gain on early extinguishment of debt included within the Company’s unaudited Condensed Consolidated Statements of Operations for the nine months ended September 30, 2024.

The remaining 2026 Notes outstanding mature, unless earlier converted, redeemed or repurchased, on April 1, 2026. The initial conversion price of the remaining 2026 Notes is approximately $44.28 per share, or 22.5861 shares per $1,000 principal amount of notes, subject to adjustment upon the occurrence of certain events. As of September 30, 2024, the maximum number of shares of common stock that could be issued to satisfy the conversion feature of the 2026 Notes was 5,999,994 shares of common stock. The 2026 Notes’ if-converted value did not exceed its principal amount as of September 30, 2024.

In March 2024, the Company provided a written notice to the trustee and the holders of the 2026 Notes that it has irrevocably elected to fix the settlement method for all conversions that may occur subsequent to the election date, to a combination of cash and shares of the Company’s common stock with the specified dollar amount, per $1,000 principal amount of the 2026 Notes, of $1,000. As a result, for any conversions of 2026 Notes occurring after the election date, a converting holder will receive (i) up to $1,000 in cash per $1,000 principal amount of the 2026 Notes and (ii) shares of the Company’s common stock for any conversion consideration in excess of $1,000 per $1,000 principal amount of the 2026 Notes converted. Prior to the election being made, the Company could have elected to settle the 2026 Notes in cash, shares of the Company’s common stock or a combination thereof.

Convertible Notes due 2030

In March 2024, the Company issued $747.5 million in aggregate principal amount of 3.00% unsecured convertible senior notes that mature, unless earlier converted, redeemed or repurchased, on March 1, 2030 (the “2030 Notes” and, together with the 2026 Notes, the “Convertible Notes”), at a price of par. Interest on the 2030 Notes is payable on March 1st and September 1st of each year, beginning on September 1, 2024. In connection with the issuance, the Company recorded debt issuance costs of $19.9 million, of which $3.7 million was settled through the issuance of shares of the Company’s common stock (see Note 20, “Supplemental Cash Flow Information”).

The 2030 Notes are convertible into cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock, at the Company’s election, at an initial conversion price of approximately $21.74 per share, or 45.9939 shares per $1,000 principal amount of 2030 Notes, subject to adjustment upon the occurrence of certain events. As of September 30, 2024, the maximum number of shares of common stock that could be issued to satisfy the conversion feature of the 2030 Notes was 48,132,646 shares of common stock, and the amount by which the 2030 Notes’ if-converted value exceeded its principal amount was $102.0 million.

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Prior to December 1, 2029, at their election, holders of the 2030 Notes may convert their outstanding notes under the following circumstances: i) during any calendar quarter commencing with the third quarter of 2024 if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; ii) during the five business day period after any ten consecutive trading day period (the “Measurement Period”) in which the trading price (as defined in the indenture governing the 2030 Notes) per $1,000 principal amount of 2030 Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; iii) if the Company calls any or all of the 2030 Notes for redemption, the notes called for redemption may be converted at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or iv) upon the occurrence of specified corporate events set forth in the indenture governing the 2030 Notes. On or after December 1, 2029, and prior to the close of business on the second scheduled trading day immediately preceding the maturity date of the 2030 Notes, holders may convert their outstanding notes at any time, regardless of the foregoing circumstances.

The Company has the option to redeem for cash the 2030 Notes, in whole or in part, beginning on March 5, 2027, if certain conditions are met as set forth in the indenture governing the 2030 Notes. The redemption price is equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest.

If the Company undergoes a fundamental change (as defined in the indenture governing the 2030 Notes), holders may require the Company to repurchase for cash all or any portion of their outstanding 2030 Notes at a price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest.

In addition, following certain corporate events that occur prior to the maturity date of the 2030 Notes or if the Company delivers a notice of early redemption, holders may, at their election, convert their outstanding 2030 Notes in connection with such event or notice, as applicable, and the Company will, in certain circumstances, increase the conversion rate but not to exceed 64.3915 shares per $1,000 principal amount of any converted 2030 Notes, subject to further adjustment upon the occurrence of certain events.

Capped Call Options

In March 2024, in connection with the offering of the 2030 Notes, the Company entered into privately negotiated capped call transactions (the “Capped Call Options”) with certain financial institutions (“Counterparties”). The Capped Call Options cover, subject to anti-dilution adjustments substantially similar to those in the 2030 Notes, 34.4 million shares of the Company’s common stock, the same number of shares that initially underlie the 2030 Notes. The Capped Call Options have an expiration date of March 1, 2030, subject to earlier exercise.

The Capped Call Options are expected generally to reduce the potential dilution to the Company’s common stock upon conversion of the 2030 Notes and/or offset cash payments the Company is required to make in excess of the principal amount of the converted 2030 Notes, as the case may be, in the event that the market price per share of the Company’s common stock, as measured under the terms of the Capped Call Options, is greater than the strike price of the Capped Call Options, which initially corresponds to the initial conversion price of the 2030 Notes, or approximately $21.74 per share of common stock, with such reduction and/or offset subject to an initial cap of $31.06 per share of the Company’s common stock.

The Capped Call Options are separate transactions, entered into by the Company with each of the Counterparties, and are not part of the terms of the 2030 Notes. Holders of the 2030 Notes will not have any rights with respect to the Capped Call Options. The Capped Call Options meet the criteria for classification as equity and, as such, are not remeasured each reporting period. During the first quarter of 2024, the Company paid $65.3 million for the Capped Call Options, which was recorded as a reduction to APIC within the Company’s unaudited Condensed Consolidated Balance Sheets along with the offsetting associated deferred tax impact of $16.1 million.

The Company elected to integrate the Capped Call Options with the 2030 Notes for federal income tax purposes pursuant to applicable U.S. Treasury Regulations. Accordingly, the $65.3 million gross cost of the purchased Capped Call Options will be deductible for income tax purposes as original discount interest over the term of the 2030 Notes.

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Interest expense related to the Convertible Notes was as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Coupon interest	$	5,738	$	431	$	13,389	$	1,293
Amortization of debt issuance costs	973		884		2,864		2,650
Convertible Notes interest expense	$	6,711	$	1,315	$	16,253	$	3,943

The debt issuance costs associated with the 2026 Notes and the 2030 Notes are being amortized to interest expense over the terms of each note at effective interest rates of 0.51% and 3.49%, respectively. The remaining term of the 2026 Notes and the 2030 Notes were 1.5 years and 5.4 years, respectively, as of September 30, 2024.

Equipment Notes

The Company has financing agreements for the purchase of certain equipment, including trucks and loaders, graders, and various other machinery. The Company’s equipment notes, which are secured by the purchased equipment, have terms of 5 years and interest rates of 4.5% per annum.

The current and non-current portions of the equipment notes, which are included within the unaudited Condensed Consolidated Balance Sheets in “Other current liabilities” and “Other non-current liabilities,” respectively, were as follows:


	September 30, 2024		December 31, 2023
(in thousands)
Equipment notes
Current	$	2,074	$	2,106
Non-current	1,073		2,637
	$	3,147	$	4,743

As of September 30, 2024, none of the agreements or indentures governing the Company’s indebtedness contain financial covenants.

NOTE 11—LEASES

The Company has operating and finance leases for certain office space, warehouses, vehicles and equipment used in its operations. The Company’s lease agreements do not contain material residual value guarantees or restrictive covenants. As of September 30, 2024, the Company was not reasonably certain of exercising any material purchase, renewal, or termination options contained within its lease agreements. No right-of-use asset impairment charges were recorded during the three and nine months ended September 30, 2024 and 2023.

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Supplemental disclosure for the unaudited Condensed Consolidated Balance Sheets related to the Company’s operating and finance leases is as follows:


	Location on Unaudited Condensed Consolidated Balance Sheets	September 30, 2024		December 31, 2023
(in thousands)
Operating leases:
Right-of-use assets	Operating lease right-of-use assets	$	9,004	$	10,065

Operating lease liability, current	Other current liabilities	$	1,057	$	959
Operating lease liability, non-current	Operating lease liabilities	6,016		6,829
Total operating lease liabilities		$	7,073	$	7,788

Finance leases:
Right-of-use assets	Other non-current assets	$	1,002	$	591

Finance lease liability, current	Other current liabilities	$	566	$	195
Finance lease liability, non-current	Other non-current liabilities	442		388
Total finance lease liabilities		$	1,008	$	583

NOTE 12—INCOME TAXES

The Company calculates the provision for income taxes during interim reporting periods by applying an estimate of the annual effective tax rate to its year-to-date pretax book income or loss. The tax effects of discrete items, including but not limited to, excess tax benefits or deficiencies associated with stock-based compensation, valuation allowance adjustments based on new evidence, and enactment of tax laws, are reported in the interim period in which they occur. The effective tax rate (income tax expense or benefit as a percentage of income or loss before income taxes) including discrete items was 26.8% and 27.5% for the three and nine months ended September 30, 2024, respectively, as compared to 4.5% and 24.5% for the three and nine months ended September 30, 2023, respectively. The Company’s effective income tax rate can vary from period to period depending on, among other factors, percentage depletion, executive compensation deduction limitations, the Section 45X Advanced Manufacturing Production Credit (the “45X Credit”), and changes to its valuation allowance against deferred tax assets. Certain of these and other factors, including the Company’s history and projections of pretax earnings, are considered in assessing its ability to realize its net deferred tax assets.

In March 2024, the Company was awarded a $58.5 million Section 48C Qualifying Advanced Energy Project Tax Credit (the “48C Credit”) to advance the construction on its Fort Worth Facility. The 48C Credit is an investment tax credit equal to 30% of qualified investments for certified projects that meet prevailing wage and apprenticeship requirements and are placed in service after the date of the award. The 48C Credit is not eligible for direct pay (i.e., it is nonrefundable); however, it is transferable to an unrelated taxpayer at a negotiated rate. As of September 30, 2024, the Company had placed into service certified projects and recognized a $3.4 million 48C Credit, which was recorded to income tax receivable, included in “Prepaid expenses and other current assets,” and deferred investment tax credit, included primarily in “Other non-current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. This amount will be recognized as a reduction to income tax expense on a straight-line basis over the estimated useful life of the associated long-lived assets.

NOTE 13—COMMITMENTS AND CONTINGENCIES

Litigation: The Company may become party to lawsuits, administrative proceedings, and government investigations, including environmental, regulatory, construction, and other matters, in the ordinary course of business. Large, and sometimes unspecified, damages or penalties may be sought in some matters, and certain matters may require years to resolve. Other than the matter described below, the Company is not aware of any pending or threatened litigation that it believes would have a material adverse effect on its unaudited Condensed Consolidated Financial Statements.

The Company is currently in a dispute with a general contractor for a construction project, which is scheduled to go to binding arbitration. The Company disputes that it owes any monies (and believes it has a valid claim against the contractor) in connection with this construction project. The Company is unable to estimate a range of loss, if any, at this time. If an unfavorable outcome were to occur in the binding arbitration, it is possible that the impact could be material to the Company’s

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unaudited Condensed Consolidated Financial Statements in the period in which any such outcome becomes probable and reasonably estimable.

NOTE 14—REVENUE RECOGNITION

The following table disaggregates the Company’s revenue from contracts with customers by type of good sold, which are transferred to customers at a point in time:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Rare earth concentrate	$	43,053	$	52,472	$	107,555	$	212,139
NdPr oxide and metal	19,179		—		34,037		—
Other revenue	695		44		1,277		101
Total revenue	$	62,927	$	52,516	$	142,869	$	212,240

Rare earth concentrate revenue is primarily generated from sales to Shenghe under either the 2022 Offtake Agreement, or starting in January 2024, under the 2024 Offtake Agreement (as such terms are defined in Note 19, “Related-Party Transactions”). The sales price of rare earth concentrate sold to Shenghe under both agreements is based on a preliminary market price per MT and estimated exchange rate between the Chinese yuan and the U.S. dollar, with an adjustment for the ultimate market price of the product realized by Shenghe upon sales to their customers, including the impact of changes in the exchange rate between the Chinese yuan and the U.S. dollar.

NdPr oxide and metal revenue was generated from sales made primarily under the Company’s distribution agreement with Sumitomo Corporation of Americas. Other revenue was generated primarily from sales of other refined products, including lanthanum and cerium.

Contract Balances: The Company recognizes revenue based on the criteria set forth in ASC Topic 606, “Revenue from Contracts with Customers.” Given the nature of the Company’s contracts with customers, contract assets are not material for any period presented. Furthermore, the amount of revenue recognized in the periods presented from performance obligations that were satisfied (or partially satisfied) in previous periods were not material to any period presented.

Contract liabilities, commonly referred to as deferred revenue, represent the Company’s obligation to transfer goods or services to a customer for which the Company has received consideration in advance of such transfer. Deferred revenue decreases as revenue is recognized from the satisfaction of the related performance obligations. In April 2024, pursuant to the long-term agreement with GM, GM prepaid to the Company $50.0 million for magnetic precursor materials. As of September 30, 2024, the Company had not yet satisfied any of the related performance obligations, and as such, the Company classified the $50.0 million as current deferred revenue in its unaudited Condensed Consolidated Balance Sheets. The Company expects to satisfy the performance obligations within the 12-month period after September 30, 2024. There were no other deferred revenue balances as of both September 30, 2024 and December 31, 2023.

NOTE 15—GOVERNMENT GRANTS

Asset-Based Grants: In November 2020, the Company was awarded a Defense Production Act Title III technology investment agreement (“TIA”) from the Department of Defense (“DOD”) to establish domestic processing for separated light rare earth elements in the amount of $9.6 million. During the nine months ended September 30, 2024, the Company received $0.1 million in reimbursements from the DOD, which was the final reimbursement expected under the TIA. There were no reimbursements received for the nine months ended September 30, 2023.

In February 2022, the Company was awarded a $35.0 million contract by the DOD’s Office of Industrial Base Analysis and Sustainment program to design and build a facility to process heavy rare earth elements (“HREE”) at Mountain Pass (the “HREE Facility”) (the “HREE Production Project Agreement”). During the nine months ended September 30, 2024 and 2023, the Company had received zero and $1.1 million, respectively, from the DOD under the HREE Production Project Agreement.

Income-Based Grants: In August 2022, the U.S. government enacted the Inflation Reduction Act of 2022, which, among other things, promotes clean energy adoption by providing several tax incentives for the domestic production and sale of eligible components for tax years beginning after December 31, 2022. Specifically, the 45X Credit provides a credit equal to 10% of eligible “production costs incurred” with respect to the production and sale of critical minerals, including NdPr oxide. In October 2024, the Internal Revenue Service released final regulations on the 45X Credit, which among other things, added

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direct and indirect materials costs, including costs related to the extraction or acquisition of raw materials, to the definition of “production costs incurred,” which were previously excluded from the definition under the proposed regulations released in December 2023. The impact of the new guidance, including a cumulative adjustment to reflect the inclusion of direct and indirect costs on previous sales, will be accounted for in the fourth quarter of 2024. The Company accounts for the 45X Credit as an income-based grant as it is not within the scope of ASC 740 due to it being refundable.

As of September 30, 2024 and December 31, 2023, the government grant receivable and deferred government grant within the Company’s unaudited Condensed Consolidated Balance Sheets pertained to the 45X Credit. During the third quarter of 2024, the Company received $19.4 million related to the 45X Credit claimed on its 2023 federal tax return. The current portion of deferred government grant, which is included in “Other current liabilities,” was $2.0 million and $1.7 million as of September 30, 2024 and December 31, 2023, respectively.

For the three and nine months ended September 30, 2024, the benefits recognized in the Company’s unaudited Condensed Consolidated Statements of Operations pertaining to the 45X Credit, which are included as reductions to “Cost of sales (excluding depreciation, depletion and amortization) (including related party),” were $1.4 million and $3.8 million, respectively, and to “Depreciation, depletion and amortization,” were $0.5 million and $1.4 million, respectively. There were no benefits recognized from income-based government grants for the three and nine months ended September 30, 2023.

NOTE 16—STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION

Treasury Stock

In March 2024, the Company’s Board of Directors approved a share repurchase program (the “Program”) effective for one year under which the Company became authorized to repurchase up to an aggregate amount of $300.0 million of the Company’s outstanding common stock. In August 2024, the Company’s Board of Directors approved a $300.0 million increase to the Program, bringing the total authorized amount to $600.0 million. The Program was also extended and is effective until August 30, 2026. The authorization does not require the purchase of any minimum number of shares.

During the three and nine months ended September 30, 2024, the Company repurchased 2.2 million and 15.2 million shares, respectively, of its common stock at an aggregate cost of $24.3 million and $225.1 million, respectively. Of the number of shares repurchased during the nine months ended September 30, 2024, 12.3 million were repurchased in March 2024 contemporaneous with the 2030 Notes offering using $191.6 million of the net proceeds from such offering. The shares repurchased in connection with the 2030 Notes offering were privately negotiated transactions with or through one of the initial purchasers of the 2030 Notes or its affiliate at a price of $15.53 per share, which was equal to the closing price per share of common stock on the date of such transactions.

As of September 30, 2024, $375.0 million was available for additional share repurchases under the Program.

Capped Call Options

In March 2024, in connection with the offering of the 2030 Notes, the Company entered into the Capped Call Options with the Counterparties, which cover, subject to anti-dilution adjustments substantially similar to those in the 2030 Notes, 34.4 million shares of the Company’s common stock, the same number of shares that initially underlie the 2030 Notes. The Capped Call Options meet the criteria for classification as equity and, as such, are not remeasured each reporting period. During the first quarter of 2024, the Company paid $65.3 million for the Capped Call Options, which was recorded as a reduction to APIC within the Company’s unaudited Condensed Consolidated Balance Sheets along with the offsetting associated deferred tax impact of $16.1 million. See Note 10, “Debt Obligations,” for additional information.

Stock-Based Compensation

2020 Incentive Plan: In November 2020, the Company’s stockholders approved the MP Materials Corp. 2020 Stock Incentive Plan (the “2020 Incentive Plan”), which permits the Company to issue stock options (incentive and/or non-qualified); stock appreciation rights (“SARs”); restricted stock, restricted stock units (“RSUs”) and other stock awards (collectively, the “Stock Awards”); and performance awards, which vest contingent upon the attainment of either or a combination of market- or performance-based goals. As of September 30, 2024, the Company has not issued any stock options or SARs and there were 5,332,696 shares available for future grants under the 2020 Incentive Plan.

Market-Based PSUs: In January 2024, pursuant to the 2020 Incentive Plan, the Compensation Committee of the Company’s Board of Directors adopted a performance share plan (the “2024 Performance Share Plan”). Pursuant to the 2024 Performance Share Plan, during the nine months ended September 30, 2024, the Company granted 177,766 of market-based

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performance stock units (“PSUs”) at target, all of which cliff vest after a requisite performance and service period of three years. The PSUs have the potential to be earned at between 0% and 200% of the number of awards granted depending on the level of growth of the Company’s total shareholder return (“TSR”) as compared to the TSR of the S&P 400 Index and the S&P 400 Materials Group over the performance period. The fair value of the market-based PSUs was determined using a Monte Carlo simulation technique.

The Company’s stock-based compensation was recorded as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	$	713	$	842	$	2,789	$	2,759
Selling, general and administrative	4,532		5,193		15,070		15,603
Start-up costs	134		254		369		651
Advanced projects and development	74		9		395		28
Total stock-based compensation expense	$	5,453	$	6,298	$	18,623	$	19,041

Stock-based compensation capitalized to property, plant and equipment, net	$	491	$	367	$	597	$	1,566

NOTE 17—FAIR VALUE MEASUREMENTS

ASC 820, “Fair Value Measurement,” establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:


Level 1:						Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2:						Quoted prices in markets that are not active, quoted prices for similar assets or liabilities in active markets, quoted prices or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability and model-based valuation techniques (e.g., the Black-Scholes model) for which all significant inputs are observable in active markets.

Level 3:						Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).

The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of assets and liabilities and their placement within the fair value hierarchy. The following methods and assumptions are used to estimate the fair value of each class of financial instruments for which it is practicable to estimate. The fair value of the Company’s accounts receivable, accounts payable, and accrued liabilities approximates the carrying amounts because of the immediate or short-term maturity of these financial instruments.

Cash, Cash Equivalents and Restricted Cash

The Company’s cash, cash equivalents and restricted cash are classified within Level 1 of the fair value hierarchy. The carrying amounts reported in the unaudited Condensed Consolidated Balance Sheets approximate the fair value of cash, cash equivalents and restricted cash due to the short-term nature of these assets.

Short-term Investments

The fair value of the Company’s short-term investments, which are classified as available-for-sale securities, is estimated based on quoted prices in active markets and is classified as a Level 1 measurement.

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Convertible Notes

The fair value of the Company’s Convertible Notes is estimated based on quoted prices in active markets and is classified as a Level 1 measurement.

Equipment Notes

The Company’s equipment notes are classified within Level 2 of the fair value hierarchy because there are inputs that are directly observable for substantially the full term of the liability. Model-based valuation techniques for which all significant inputs are observable in active markets were used to calculate the fair values of liabilities classified within Level 2 of the fair value hierarchy.

Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:


	September 30, 2024
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	284,434	$	284,434	$	284,434	$	—	$	—
Short-term investments	$	582,056	$	582,056	$	582,056	$	—	$	—
Restricted cash	$	1,160	$	1,160	$	1,160	$	—	$	—
Financial liabilities:
2026 Notes	$	208,362	$	192,938	$	192,938	$	—	$	—
2030 Notes	$	729,272	$	823,812	$	823,812	$	—	$	—
Equipment notes	$	3,147	$	3,114	$	—	$	3,114	$	—


	December 31, 2023
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	263,351	$	263,351	$	263,351	$	—	$	—
Short-term investments	$	734,493	$	734,493	$	734,493	$	—	$	—
Restricted cash	$	1,637	$	1,637	$	1,637	$	—	$	—
Financial liabilities:
2026 Notes	$	681,980	$	619,496	$	619,496	$	—	$	—
Equipment notes	$	4,743	$	4,628	$	—	$	4,628	$	—

NOTE 18—EARNINGS (LOSS) PER SHARE

Basic earnings (loss) per share is computed by dividing Net income (loss) by the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing Net income (loss) by the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method or the if-converted method, as applicable.

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The following table reconciles the weighted-average common shares outstanding used in the calculation of basic earnings (loss) per share to the weighted-average common shares outstanding used in the calculation of diluted earnings (loss) per share:


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
Weighted-average shares outstanding, basic	164,149,348	177,231,717	168,002,773	177,034,068
Assumed conversion of 2026 Notes	—	—	4,063,441	15,584,409

Assumed conversion of restricted stock	—	—	—	620,190
Assumed conversion of RSUs	—	—	—	393,995

Weighted-average shares outstanding, diluted	164,149,348	177,231,717	172,066,214	193,632,662

The following table presents unweighted potentially dilutive shares that were not included in the computation of diluted earnings (loss) per share because to do so would have been antidilutive:


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
2026 Notes	—	15,584,409	—	—
2030 Notes	34,380,440	—	34,380,440	—
Restricted Stock	342,601	685,202	342,601	—
RSUs	1,762,523	1,629,938	1,762,523	3,184
Total	36,485,564	17,899,549	36,485,564	3,184

The following table presents the calculation of basic and diluted earnings (loss) per share for the Company’s common stock:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands, except share and per share data)	2024		2023		2024		2023
Calculation of basic earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Weighted-average shares outstanding, basic	164,149,348		177,231,717		168,002,773		177,034,068
Basic earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.26)	$	0.23

Calculation of diluted earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Interest expense, net of tax(1):
2026 Notes(2)	—		—		770		2,977
Gain on early extinguishment of debt(1)(2)(3)	—		—		(33,563)		—
Diluted income (loss)	$	(25,516)	$	(4,276)	$	(75,875)	$	43,543
Weighted-average shares outstanding, diluted	164,149,348		177,231,717		172,066,214		193,632,662
Diluted earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.44)	$	0.22

(1)The nine months ended September 30, 2024 and 2023, were tax-effected at a rate of 27.5% and 24.5%, respectively.

(2)The 2026 Notes were antidilutive for the three months ended September 30, 2024 and 2023. Convertible debt becomes antidilutive whenever the combined impact of interest expense and any gains or losses recognized on actual settlements of convertible debt (net of tax) per common share obtainable upon conversion exceeds basic earnings (loss) per share.

(3)Pertains to the 2026 Notes, a portion of which were repurchased during the nine months ended September 30, 2024.

In connection with the issuance of the 2030 Notes, the Company entered into Capped Call Options, which were not included for purposes of calculating the number of diluted shares outstanding, as their effect would have been anti-dilutive. The Capped Call Options are expected to partially offset the potential dilution to the Company’s common stock upon any conversion of the 2030 Notes. The Company has not exercised any of the Capped Call Options as of September 30, 2024.

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As discussed in Note 10, “Debt Obligations,” in March 2024, the Company provided a written notice to the trustee and the holders of the 2026 Notes that it has irrevocably elected to fix the settlement method for all conversions that may occur subsequent to the election date, to a combination of cash and shares of the Company’s common stock with the specified dollar amount per $1,000 principal amount of the 2026 Notes of $1,000. As a result, subsequent to the election, only the amounts in excess of the principal amount are considered in diluted earnings (loss) per share. The amount of the 2026 Notes settled in shares of common stock will have a dilutive impact on diluted earnings (loss) per share when the average market price of the Company’s common stock for a given period exceeds the conversion price, which was initially approximately $44.28 per share of common stock.

NOTE 19—RELATED-PARTY TRANSACTIONS

Offtake Agreements: In March 2022, the Company entered into an offtake agreement (the “2022 Offtake Agreement”) with Shenghe Resources (Singapore) International Trading Pte. Ltd. (“Shenghe”), a majority-owned subsidiary of Leshan Shenghe Rare Earth Co., Ltd. whose ultimate parent is Shenghe Resources Holding Co., Ltd., a leading global rare earth company listed on the Shanghai Stock Exchange. The 2022 Offtake Agreement became effective upon the termination of the amended and restated offtake agreement with Shenghe. The initial term of the 2022 Offtake Agreement was two years, with the option to extend the term at the Company’s discretion for an additional one-year period.

Pursuant to the 2022 Offtake Agreement, and subject to certain exclusions, Shenghe was obligated to purchase on a “take or pay” basis the rare earth concentrate produced by the Company as the exclusive distributor in China, with certain exceptions for the Company’s direct sales globally. In addition, at the discretion of the Company, Shenghe may be required to purchase on a “take or pay” basis certain non-concentrate rare earth products, although the Company may sell all non-concentrate rare earth products in its sole discretion to customers or end users in any jurisdiction.

The sales prices of rare earth concentrate sold to Shenghe were based on a preliminary market price per metric ton, with an adjustment for the ultimate market price of the product realized by Shenghe upon sales to their customers. The sales price and other terms applicable to a quantity of offtake products were set forth in monthly purchase agreements between the Company and Shenghe. Under the 2022 Offtake Agreement, Shenghe was paid a variable commission on net proceeds to the Company.

In January 2024, the Company entered into a new offtake agreement with Shenghe (the “2024 Offtake Agreement” and, together with the 2022 Offtake Agreement, the “Offtake Agreements”) that replaced and extended the 2022 Offtake Agreement. The initial term of the 2024 Offtake Agreement is two years, with the option for the Company to extend the term for an additional one-year period. The terms of the 2024 Offtake Agreement are substantially the same as those of the 2022 Offtake Agreement with the exception of the addition of NdPr metal into the definition of non-concentrate rare earth products.

Tolling Agreement with VREX Holdco: In October 2023, prior to the Company’s investment in VREX Holdco, the Company entered into a tolling agreement with VREX Holdco (the “Tolling Agreement”). Pursuant to the Tolling Agreement, the Company delivers NdPr oxide to VREX Holdco, which VREX Holdco then causes VREX to process into NdPr metal for delivery to the Company’s customers globally. During the term of the Tolling Agreement, the Company will pay VREX Holdco a processing fee per unit of rare earth metal produced. The Company maintains title to the products and directly enters into sales agreements for the produced NdPr metal. The initial term of the Tolling Agreement is three years and may be renewed for additional three-year terms.

Revenue and Cost of Sales: The Company’s related-party revenue and cost of sales were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Revenue:
Rare earth concentrate	$	43,053	$	51,502	$	107,555	$	203,186
NdPr oxide and metal	$	5,061	$	—	$	7,306	$	—

Cost of sales (excluding depreciation, depletion and amortization)	$	38,139	$	21,829	$	78,848	$	66,817

Purchases of Materials and Supplies: The Company purchases certain reagent products (generally produced by an unrelated third-party manufacturer) used in the flotation process as well as other materials from Shenghe in the ordinary course of business. Total purchases were $1.8 million and $4.1 million for the three and nine months ended September 30, 2024,

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respectively, as compared to $5.8 million and $7.6 million for the three and nine months ended September 30, 2023, respectively.

Accounts Receivable: As of September 30, 2024, and December 31, 2023, $8.2 million and $9.2 million, respectively, of the accounts receivable as stated in the unaudited Condensed Consolidated Balance Sheets, were receivable from and pertained to sales made to Shenghe in the ordinary course of business.

NOTE 20—SUPPLEMENTAL CASH FLOW INFORMATION

Supplemental cash flow information and non-cash investing and financing activities were as follows:


	For the nine months ended September 30,
(in thousands)	2024		2023
Supplemental cash flow information:
Cash paid for interest	$	11,796	$	1,116
Cash payments related to income taxes(1)	$	—	$	23,101
Change in construction payables and accrued construction costs	$	(14,756)	$	10,952
Supplemental non-cash investing and financing activities:
Common stock issued to acquire intangible asset	$	—	$	8,963
Common stock issued in exchange for financial advisory services	$	3,737	$	—
Operating right-of-use assets obtained in exchange for lease liabilities	$	—	$	7,608

Excise tax obligation related to repurchases of common stock	$	2,037	$	—

(1)The nine months ended September 30, 2024, exclude the receipt of $19.4 million related to the 45X Credit claimed on the Company’s 2023 federal tax return, as the 45X Credit is not within the scope of ASC 740. See Note 15, “Government Grants,” for additional information.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of financial condition, results of operations, liquidity and capital resources should be read in conjunction with, and is qualified in its entirety by, the unaudited Condensed Consolidated Financial Statements and the notes thereto included in this Quarterly Report on Form 10-Q (“Form 10-Q”), and the Consolidated Financial Statements and notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in the Annual Report on Form 10-K for the year ended December 31, 2023 (“Form 10-K”). This discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. The actual results may differ materially from those anticipated in these forward-looking statements as a result of certain factors, including, but not limited to, those set forth under “Part II. Item 1A. Risk Factors” and elsewhere in this Form 10-Q and “Part I. Item 1A. Risk Factors” and elsewhere in our Form 10-K. See also “Cautionary Note Regarding Forward-Looking Statements.”

Business Overview

MP Materials Corp., including its subsidiaries (“we,” “our,” and “us”), is the largest producer of rare earth materials in the Western Hemisphere. We own and operate the Mountain Pass Rare Earth Mine and Processing Facility (“Mountain Pass”), the only rare earth mining and processing site of scale in North America, and are also constructing a rare earth metal, alloy and magnet manufacturing facility in Fort Worth, Texas (the “Fort Worth Facility”), where we anticipate manufacturing neodymium-iron-boron (“NdFeB”) permanent magnets and its precursor products.

We produce rare earth concentrate products as well as refined rare earth oxides and related products. The rare earth concentrate is principally sold pursuant to the Offtake Agreements to Shenghe (as such terms are defined in Note 19, “Related-Party Transactions,” in the notes to the unaudited Condensed Consolidated Financial Statements), that, in turn, typically sells that product to refiners in China. Following the commissioning of our Stage II optimization project (“Stage II”) in the second half of 2023, we began producing and selling separated rare earth products, including neodymium-praseodymium (“NdPr”) oxide. Additionally, we have a long-term agreement with General Motors Company (NYSE: GM) (“GM”) to supply U.S.-sourced and manufactured rare earth materials and finished magnets for the electric motors in more than a dozen GM models. In April 2024, pursuant to the long-term supply agreement with GM, we received a $50.0 million initial prepayment for magnetic precursor materials. See Note 14, “Revenue Recognition” in the notes to the unaudited Condensed Consolidated Financial Statements for additional details. These developments are part of our Stage III downstream expansion strategy (“Stage III”).

Certain rare earth elements (“REE”) serve as critical inputs for the rare earth magnets inside the electric motors and generators powering carbon-reducing technologies such as hybrid and electric vehicles (referred to collectively as “xEVs”) and wind turbines, as well as drones, defense systems, robotics and many other high-growth, advanced technologies. In addition, rare earth magnets are critical components of various consumer electronics, appliances, and industrial products. Our integrated operations at Mountain Pass combine low production costs with high environmental standards, thereby restoring American leadership to a critical industry with a strong commitment to sustainability.

Recent Developments and Other Information

NdPr Supply Agreement

In June 2024, we entered into an NdPr supply agreement with a global automaker, committing to a significant volume of NdPr products. The initial term of the agreement concludes on December 31, 2026, unless the volume commitment is fulfilled earlier. There is an option to extend the term by up to an additional three-year period, subject to mutual agreement.

Issuance of 2030 Notes, Capped Call Options, Repurchases of 2026 Notes and Repurchases of Common Stock

In March 2024, we issued $747.5 million in aggregate principal amount of 3.00% unsecured convertible senior notes that mature, unless earlier converted, redeemed or repurchased, on March 1, 2030 (the “2030 Notes”). In connection with the offering, we entered into privately negotiated capped call transactions (the “Capped Call Options”) with certain financial institutions, which cover, subject to anti-dilution adjustments substantially similar to those in the 2030 Notes, 34.4 million shares of our common stock, the same number of shares that initially underlie the 2030 Notes.

Also, in March 2024, principally in connection with the offering of the 2030 Notes, we repurchased (i) $480.0 million in aggregate principal amount of our 0.25% unsecured convertible senior notes that mature, unless earlier converted, redeemed or repurchased, on April 1, 2026 (the “2026 Notes” and, together with the 2030 Notes, the “Convertible Notes”) for $428.6 million, and (ii) 13.0 million shares of our common stock at an aggregate cost of $200.8 million. In August 2024, we

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repurchased an additional 2.2 million shares of our common stock at an aggregate cost of $24.3 million. See the “Liquidity and Capital Resources” section below for a full discussion of these transactions.

2024 Offtake Agreement

In January 2024, we entered into a new offtake agreement with Shenghe (the “2024 Offtake Agreement”) that replaced and extended the offtake agreement entered into in March 2022 with Shenghe (the “2022 Offtake Agreement” and, together with the 2024 Offtake Agreement, the “Offtake Agreements”). The initial term of the 2024 Offtake Agreement is two years, with the option for us to extend the term for an additional one-year period. The terms of the 2024 Offtake Agreement are substantially the same as those of the 2022 Offtake Agreement with the exception of the addition of NdPr metal into the definition of non-concentrate rare earth products. See Note 19, “Related-Party Transactions,” in the notes to the unaudited Condensed Consolidated Financial Statements for additional discussion of the Offtake Agreements.

Section 48C Qualifying Advanced Energy Project Tax Credit

In March 2024, we were awarded a $58.5 million Section 48C Qualifying Advanced Energy Project Tax Credit (the “48C Credit”) to advance the construction of our Fort Worth Facility. The 48C Credit is an investment tax credit equal to 30% of qualified investments for certified projects that meet prevailing wage and apprenticeship requirements and are placed in service after the date of the award. The allocation of the awards under the 48C Credit was issued by the Internal Revenue Service and Treasury following a competitive, oversubscribed process administered by the Department of Energy that evaluated the technical and commercial viability and environmental and community impact of approximately 250 projects. See Note 12, “Income Taxes,” in the notes to the unaudited Condensed Consolidated Financial Statements for additional information.

Key Performance Indicators

We have historically used and/or currently use the following key performance indicators (“KPIs”) to evaluate the performance of our business. However, as our business continues to evolve and transitions from production of rare earth concentrate to production of separated rare earth products, the metrics that management uses to evaluate the business may continue to change or be revised. For example, beginning with the first quarter of 2024, we no longer present Production Cost per rare earth oxide (“REO”) equivalent metric ton (“MT”), which was a metric focused solely on Stage I concentrate operations, as it is no longer meaningful in evaluating and understanding our business or operating results. Our calculations of these KPIs may differ from similar measures published by other companies in our industry or in other industries. The following table presents our KPIs:


	For the three months ended September 30,				Change				For the nine months ended September 30,				Change
(in whole units or dollars, except percentages)	2024		2023		Amount		%		2024		2023		Amount		%
Rare earth concentrate
REO Production Volume (MTs)	13,742		10,766		2,976		28	%	33,977		32,300		1,677		5	%
REO Sales Volume (MTs)	9,729		9,177		552		6	%	24,900		29,663		(4,763)		(16)	%
Realized Price per REO MT	$	4,425	$	5,718	$	(1,293)	(23)	%	$	4,319	$	7,152	$	(2,833)	(40)	%
Separated NdPr products
NdPr Production Volume (MTs)	478		50		428		856	%	881		50		831		N/M
NdPr Sales Volume (MTs)	404		—		404		N/A		674		—		674		N/A
NdPr Realized Price per KG	$	47	N/A		N/A		N/A		$	51	N/A		N/A		N/A

N/M = Not meaningful.
N/A = Not applicable as there was no NdPr sales volume in these periods.

REO Production Volume

We measure our REO-equivalent production volume for a given period in MTs, our principal unit of sale for our concentrate product. This measure refers to the REO content contained in the rare earth concentrate we produce and, beginning in the second quarter of 2023, includes volumes fed into downstream circuits for commissioning and starting up our separations facilities and for producing separated rare earth products, a portion of which is also included in our KPI, NdPr Production Volume. Our REO Production Volume is a key indicator of our mining and processing capacity and efficiency.

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The rare earth concentrate is a processed, concentrated form of our mined rare earth-bearing ores. While our unit of production and sale is a MT of contained REO, the actual weight of our rare earth concentrate is significantly greater, as the concentrate also contains non-REO minerals, loss-on-ignition, and residual moisture from the production process. We target REO content of greater than 60% per dry MT of concentrate (referred to as “REO grade”). The elemental distribution of REO in our concentrate is relatively consistent over time and production lot. We consider this the natural distribution, as it reflects the distribution of elements contained, on average, in our ore.

REO Sales Volume

Our REO Sales Volume for a given period is calculated in MTs. A unit, or MT, is considered sold once we recognize revenue on its sale as determined in accordance with generally accepted accounting principles in the United States (“GAAP”). Our REO Sales Volume is a key measure of our ability to convert our concentrate production into revenue. Our REO Sales Volume includes both traditional concentrate as well as roasted concentrate.

Realized Price per REO MT

We calculate the Realized Price per REO MT for a given period as the quotient of: (i) our rare earth concentrate sales, which are determined in accordance with GAAP, for a given period and (ii) our REO Sales Volume for the same period. Realized Price per REO MT is an important measure of the market price of our concentrate product.

NdPr Production Volume

We measure our NdPr Production Volume for a given period in MTs, our principal unit of sale for our NdPr separated products. NdPr Production Volume refers to the volume of finished and packaged NdPr oxide produced at Mountain Pass for a given period. NdPr Production Volume is a key indicator of our separations and finishing capacity and efficiency.

NdPr Sales Volume

Our NdPr Sales Volume for a given period is calculated in MTs and on an NdPr oxide-equivalent basis (as further discussed below). A unit, or MT, is considered sold once we recognize revenue on its sale, whether sold as NdPr oxide or NdPr metal, as determined in accordance with GAAP. For NdPr metal sales, the MTs sold and included in NdPr Sales Volume are calculated on the basis of the volume of NdPr oxide used to produce such NdPr metal. We utilize an assumed material conversion ratio of 1.20, such that a sale of 100 MTs of NdPr metal would be included in this KPI as 120 MTs of NdPr oxide-equivalent. NdPr Sales Volume is a key measure of our ability to convert our production of separated NdPr products into revenue.

We have a mix of contracts with customers where we sell NdPr as (i) oxide, (ii) metal, where the amount of oxide required to produce such metal is variable, and (iii) metal, where we have a guarantee of the amount produced and sold based on the amount of oxide consumed. Among other factors, differences between quarterly NdPr Production Volume and NdPr Sales Volume may be caused by the time required for the conversion of NdPr oxide to NdPr metal, including time in-transit, as well as differences in actual versus assumed yields of oxide to metal in the calculation of NdPr Sales Volume.

NdPr Realized Price per KG

We calculate the NdPr Realized Price per kilogram (“KG”) for a given period as the quotient of: (i) our NdPr oxide and metal sales, which are determined in accordance with GAAP, for a given period and (ii) our NdPr Sales Volume for the same period. NdPr Realized Price per KG is an important measure of the market price of our NdPr products.

Factors Affecting Our Performance

We believe we are uniquely positioned to capitalize on the key trends of electrification and supply chain security, particularly as domestic xEV production grows. Our continued success depends to a significant extent on our ability to take advantage of the following opportunities and meet the challenges associated with them.

Demand for REE

The key demand drivers for REE are a diverse array of growing end markets, including electric mobility, renewable power generation, energy-efficient motors, pumps and compressors, industrial and service robotics, consumer and medical applications, critical defense systems, and catalysts and phosphors. Accordingly, the demand for our products may be impacted by demand for these downstream products, particularly the continued growth in xEVs. Despite the current macroeconomic conditions, we continue to believe we benefit from the growth of the rare earth market, particularly the market for NdPr and

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permanent magnets, and from several demand tailwinds for REE. These include the trend toward electrification; geographic supply chain diversification, particularly in relation to China; the U.S. government initiatives to restore domestic supply of critical minerals; and the increasing acceptance of environmental, social and governance mandates.

However, changes in technology could also drive down the use of REE, including NdPr, in the components in which they are now used, or lead to a decline in reliance on such components altogether. Actual, or perceived, decreases in demand for REE, whether through changes in technology or slower growth in the end markets that utilize REE, could result in a decline in the market price of REE, including NdPr, and/or result in pricing volatility. We also operate in a competitive industry. Many of our key competitors are based in China, where competitors may not be subject to the same rigorous environmental standards or may receive disproportionate government subsidies, and production costs are typically lower than in the U.S.

Maximizing Production Efficiency

Subsequent to the implementation of our Stage I optimization plan, and starting in 2021, we have achieved at least 40,000 MTs of annual REO Production Volume. These results were achieved by optimizing the reagent scheme, reducing process temperatures, improving tailings facility management, and committing to operational excellence, which allowed us to achieve approximately 92% uptime in our most recent full fiscal year. Our Stage I optimization plan enabled us to achieve what we believe to be world-class production cost levels for rare earth concentrate.

In November 2023, we announced our “Upstream 60K” strategy whereby we intend to grow our annual REO Production Volume to approximately 60,000 MTs by expanding upstream capacity via investments in further beneficiation, including the ability to process alternative feedstocks and upgrade lower-grade feedstocks. We aim to achieve this initiative within the next four years with modest incremental capital investment.

The success of our business reflects our ability to continue to manage our costs and drive scale. Our production achievements in Stage I have provided economies of scale to lower production costs per MT of REO produced in concentrate. Furthermore, we designed our Stage II process flow to capitalize on the inherent advantages of the bastnaesite ore at Mountain Pass, which is well-suited to low-cost refining by selectively eliminating the need to carry cerium, a lower-value mineral, through the separations process. Additionally, our location and integration offer cost and transportation advantages that create meaningful efficiencies in production, security of incoming supplies and shipping of our final products.

We currently operate a single site in a single location, and any stoppage in activity, including for reasons outside of our control, could adversely impact our production, results of operations and cash flows. In addition, several of our current and potential competitors are government supported and may have access to substantially more capital, which may allow them to make similar or greater efficiency improvements or undercut market prices for our product.

Development of Our REE Refining and Downstream Manufacturing Capabilities

Stage II advanced our operations from the production of rare earth concentrate to the separation of individual REE. The project incorporated upgrades and enhancements to the prior facility process flow intended to reliably produce separated REE at a low cost while minimizing our impact on the environment. More specifically, we have reintroduced an oxidizing roasting circuit, reoriented portions of the plant process flow, increased product finishing capacity, improved wastewater management, and made other improvements to materials handling and storage. The reintroduction of the oxidizing roasting circuit allows subsequent stages of the production process to occur at lower temperatures, and with lower volumes of materials and reagents, which supports lower operating and maintenance costs and higher uptime than would otherwise be achievable.

During the second half of 2023, we began producing separated rare earth products. However, we continue to expect that it may take many quarters to achieve our designed throughput of separated products. As we increase production of separated products over time, we expect to improve our per-unit production costs of NdPr oxide, which represents a majority of the value contained in our concentrate. Until such time, we may experience unstable operations and elevated costs of our initial production of separated products.

Partially supported by a $35.0 million award from the Department of Defense’s Office of Industrial Base Policy, Industrial Base Analysis and Sustainment program, we are currently advancing the facilitating works, engineering and procurement on our processing and separations facility for heavy rare earth elements (“HREE”) (the “HREE Facility”), which will be built at Mountain Pass and will be integrated into the rest of our Stage I and Stage II facilities.

In addition, we are constructing the Fort Worth Facility and developing engineering and manufacturing technology to process NdPr oxide into metal and magnets, while incorporating magnet recycling capabilities. These initiatives support our long-term plans to become a leading global source for rare earth magnets. We believe integration into magnet production will

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provide some protection from commodity pricing volatility, while also enhancing our business profile as the producer of a critical industrial output in addition to a producer of resources. We expect our Stage III efforts to continue to benefit from geopolitical developments, including initiatives to repatriate critical materials supply chains.

Our Mineral Reserves

Our ore body has proven over more than 60 years of operations to be one of the world’s largest and highest-grade rare earth resources. As of December 31, 2023, SRK Consulting (U.S.), Inc., an independent consulting firm that we retained to assess our reserves, estimated total proven and probable reserves of 1.86 million short tons of REO contained in 28.46 million short tons of ore at Mountain Pass, with an average ore grade of 6.20%. These estimates use an estimated economical cut-off grade of 2.43% total rare earth oxide. Based on these estimated reserves and our expected annual production rate of REO upon production ramp-up of Stage II, our expected mine life was approximately 33 years as of December 31, 2023. Over time, we expect to be able to continue to grow our expected mine life through additional exploratory drilling and improved processing capabilities, which may result in changes to various assumptions underlying our mineral reserve estimate.

Mining activities in the U.S. are heavily regulated, particularly in California. Regulatory changes may make it more challenging for us to access our reserves. In addition, new mineral deposits may be discovered elsewhere, which could make our operations less competitive.

Results of Operations

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

The following table summarizes our results of operations:


	For the three months ended September 30,				Change				For the nine months ended September 30,				Change
(in thousands, except percentages)	2024		2023		$		%		2024		2023		$		%
Revenue:
Rare earth concentrate	$	43,053	$	52,472	$	(9,419)	(18)	%	$	107,555	$	212,139	$	(104,584)	(49)	%
NdPr oxide and metal	19,179		—		19,179		N/M		34,037		—		34,037		N/M
Other revenue	695		44		651		N/M		1,277		101		1,176		N/M
Total revenue	62,927		52,516		10,411		20	%	142,869		212,240		(69,371)		(33)	%
Operating costs and expenses:
Cost of sales(1)	57,266		22,217		35,049		158	%	134,323		69,137		65,186		94	%
Selling, general and administrative	21,525		19,561		1,964		10	%	64,226		57,829		6,397		11	%
Depreciation, depletion and amortization	19,344		16,751		2,593		15	%	55,939		37,076		18,863		51	%
Start-up costs	1,627		7,336		(5,709)		(78)	%	4,287		16,125		(11,838)		(73)	%
Advanced projects and development	2,051		2,873		(822)		(29)	%	8,143		9,586		(1,443)		(15)	%
Other operating costs and expenses	654		1,314		(660)		(50)	%	1,415		6,578		(5,163)		(78)	%
Total operating costs and expenses	102,467		70,052		32,415		46	%	268,333		196,331		72,002		37	%
Operating income (loss)	(39,540)		(17,536)		(22,004)		125	%	(125,464)		15,909		(141,373)		N/M
Interest expense, net	(6,646)		(1,396)		(5,250)		376	%	(16,248)		(4,147)		(12,101)		292	%
Gain on early extinguishment of debt	—		—		—		N/M		46,265		—		46,265		N/M
Other income, net	11,320		14,456		(3,136)		(22)	%	36,061		41,970		(5,909)		(14)	%
Income (loss) before income taxes	(34,866)		(4,476)		(30,390)		679	%	(59,386)		53,732		(113,118)		N/M
Income tax benefit (expense)	9,350		200		9,150		N/M		16,304		(13,166)		29,470		N/M
Net income (loss)	$	(25,516)	$	(4,276)	$	(21,240)	497	%	$	(43,082)	$	40,566	$	(83,648)	N/M

Adjusted EBITDA(2)	$	(11,168)	$	15,551	$	(26,719)	N/M		$	(39,461)	$	101,202	$	(140,663)	N/M
Adjusted Net Income (Loss)(2)	$	(19,634)	$	7,026	$	(26,660)	N/M		$	(55,162)	$	75,376	$	(130,538)	N/M

N/M = Not meaningful.

(1)Excludes depreciation, depletion and amortization.

(2)Non-GAAP financial measures are defined and reconciled to the most directly comparable GAAP financial measures in the “Non-GAAP Financial Measures” section below.

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Rare earth concentrate revenue consists primarily of sales of traditional and roasted rare earth concentrate. The decreases in rare earth concentrate revenue for the three and nine months ended September 30, 2024, as compared to the respective prior year periods, were driven primarily by lower Realized Price per REO MT, which decreased by 23% and 40%, respectively. The three months ended September 30, 2024, benefited from an increase in REO Sales Volume of 6%, while the nine months ended September 30, 2024, were impacted by lower REO Sales Volume, which decreased by 16%.

Realized Price per REO MT for the three and nine months ended September 30, 2024, reflects the continued softness in the pricing environment for rare earth products. As noted above in the “Factors Affecting our Performance” section, market prices for rare earth products may be volatile due to actual or perceived changes in supply or demand. The decline in the market prices for rare earth products was largely attributable to lower than anticipated growth in demand for magnetic products, which negatively impacted the price of REE. The increase in REO Sales Volume for the three months ended September 30, 2024, was primarily the result of an increase in REO Production Volume of 28%, reflecting higher mineral recoveries and operational efficiencies achieved as part of our ongoing efforts to expand upstream capacity. The decrease in REO Sales Volume for the nine months ended September 30, 2024, was due to the ramp-up of Stage II operations where a significant portion of the REO produced, which could otherwise have been sold as rare earth concentrate, was used in our refining process to produce separated rare earth products.

Prior to the commencement of production of separated rare earth materials in the third quarter of 2023, our REO Sales Volume generally tracked our REO Production Volume over time with slight period-to-period differences caused by the timing of shipments. However, as we have ramped production of separated rare earth materials, significant volumes of REO produced from Stage I operations have been retained for separation rather than sold as concentrate, resulting in REO Sales Volume being significantly below REO Production Volume. In addition, a significant portion of the contained cerium in the REO produced is intentionally rejected and may not result in finished product. We expect this trend to continue in the future as we produce and sell more separated products. See the “Quarterly Performance Trend” section below for additional information.

NdPr oxide and metal revenue consists of sales of NdPr oxide and metal, which commenced in the fourth quarter of 2023. As we ramp up production of separated rare earth products, we expect our NdPr oxide and metal revenue to become a larger proportion of our total revenue. Accordingly, to the extent we sell a greater volume of NdPr oxide and NdPr metal, we expect that rare earth concentrate revenue will decline in future periods.

The increases in NdPr oxide and metal revenue for the three and nine months ended September 30, 2024, were driven by sales of NdPr oxide and metal, primarily pursuant to our distribution agreement with Sumitomo Corporation of Americas, with no comparable sales in the respective prior year periods.

Cost of sales (excluding depreciation, depletion and amortization) (“COS”) consists of production- and processing-related labor costs (including wages and salaries, benefits, bonuses, and stock-based compensation), mining and processing supplies and reagents, parts and labor for the maintenance of our mining fleet and processing facilities, other facilities-related costs (such as property taxes and utilities), packaging materials, and shipping and freight costs.

The increases in COS for the three and nine months ended September 30, 2024, were driven by elevated per-unit production costs associated with separated rare earth products sold in the current year periods, as we continue to ramp and optimize production of separated products. The increases in COS were also attributable to higher payroll costs, professional services, and property and other taxes. Additionally, the nine months ended September 30, 2024, included $1.9 million in higher repairs and maintenance expenses associated with the thickener equipment damage in the second quarter of 2024. Lastly, COS for the nine months ended September 30, 2024, included $15.1 million in reserves on certain of our work in process and finished goods inventories, which represented a reduction in the reserve of $2.7 million from the most recent quarter that benefited COS for the three months ended September 30, 2024. We may incur additional reserves on inventories prior to achieving normalized production levels on our Stage II facilities.

Selling, general and administrative (“SG&A”) expenses consist primarily of personnel costs (including salaries, benefits, bonuses, and stock-based compensation) of our administrative functions such as executives, accounting and finance, legal, and information technology; professional services (including legal, regulatory, audit and others); certain engineering expenses; insurance, license and permit costs; corporate office lease cost; office supplies; and certain environmental, health and safety expenses.

The increases in SG&A expenses were primarily due to higher personnel costs (other than stock-based compensation expense), which increased by $1.1 million and $3.1 million for the three and nine months ended September 30, 2024, respectively, as compared to the respective prior year periods, partially due to increased employee headcount to support our downstream expansion. In addition, higher legal costs as well as costs related to our enterprise resource planning system implementation contributed to the increase for both comparable periods.

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Depreciation, depletion and amortization primarily consists of depreciation of property, plant and equipment and depletion of mineral rights. The year-over-year increases in depreciation, depletion and amortization for the three and nine months ended September 30, 2024, primarily reflect increases in depreciation of $2.1 million and $17.6 million, respectively. Depreciation increased as a result of the timing of placing new circuits and facilities associated with our Stage II optimization project into service, which occurred progressively throughout 2023, and the placement of certain of our Fort Worth Facility assets into service in the fourth quarter of 2023.

Start-up costs relate to costs associated with restarting an existing facility or commissioning a new facility, circuit or process of our production, manufacturing, or separations facilities prior to the achievement of commercial production, that do not qualify for capitalization. Such costs, which are expensed as incurred, include certain salaries and wages, outside services, parts, training, and utilities, among other items, used or consumed directly in these start-up activities.

Start-up costs for the three and nine months ended September 30, 2024, decreased by $5.7 million and $11.8 million, respectively, as compared to the prior year comparable periods, attributable to the commencement of our operations related to our Stage II optimization project. Start-up costs associated with Stage II decreased, specifically as a result of salaries and wages of certain employees no longer being considered start-up given the commencement of initial production of separated products in late 2023, which also resulted in the higher personnel costs discussed above within COS. Start-up costs attributable to our Stage III initiatives increased by $0.8 million and $2.0 million, respectively, for the three and nine months ended September 30, 2024, as compared to the prior year comparable periods, in line with the development of our magnetics capability and team headcount.

Advanced projects and development consists principally of costs incurred in connection with research and development of new processes or to significantly enhance our existing processes; and certain government contracts, as well as costs incurred to support growth initiatives or pursue other opportunities. Advanced projects and development for the three and nine months ended September 30, 2024, decreased year over year, primarily due to lower costs incurred for legal, consulting, and advisory services to support growth initiatives, such as potential acquisitions, mergers, or other investments, which decreased by $0.9 million and $2.2 million, respectively, when compared to the respective prior year periods. This was partially offset by continued investment in research and development activities associated with Stage III magnetics, which increased by $0.6 million and $1.6 million, respectively, when compared to the respective prior year periods.

Other operating costs and expenses consists primarily of accretion of asset retirement and environmental obligations and gains or losses on disposals of long-lived assets, including demolition costs. Other operating costs and expenses decreased year over year as a result of demolition costs incurred in the prior year periods, totaling $0.8 million and $5.5 million for the three and nine months ended September 30, 2023, respectively, associated with demolishing and removing certain out-of-use older facilities and infrastructure from the Mountain Pass site to accommodate future expansion in rare earth processing.

Interest expense, net principally consists of expense associated with the 0.25% and 3.00% per annum interest rates and amortization of the debt issuance costs on our 2026 Notes and 2030 Notes, respectively, offset by capitalized interest. Interest expense, net for the three and nine months ended September 30, 2024, increased year over year due to the issuance of the 2030 Notes, partially offset by repurchases of the 2026 Notes.

Gain on early extinguishment of debt during the nine months ended September 30, 2024, is the result of the repurchase of a portion of our 2026 Notes at prices lower than the associated carrying amounts. See the “Liquidity and Capital Resources” section below for additional information.

Other income, net consists of interest and investment income and non-operating gains or losses. Other income, net for the three and nine months ended September 30, 2024, decreased year over year as a result of lower interest and investment income earned on our short-term investments, whose balance decreased slightly over the applicable periods. Interest and investment income is principally generated from accretion of the discount on such investments.

Income tax benefit (expense) consists of an estimate of U.S. federal and state income taxes in the jurisdictions in which we conduct business, adjusted for federal, state and local allowable income tax benefits, the effect of permanent differences and any valuation allowance against deferred tax assets. The effective tax rate (income tax expense as a percentage of income before income taxes) was 26.8% and 27.5% for the three and nine months ended September 30, 2024, respectively, as compared to 4.5% and 24.5% for the three and nine months ended September 30, 2023, respectively. The effective tax rate for the three and nine months ended September 30, 2024 and 2023, differed from the statutory tax rate of 21% primarily due to the Section 45X Advanced Manufacturing Production Credit (the “45X Credit”) and the California Competes Tax Credit, offset by state income tax expense and a deduction limitation on officers’ compensation. For additional information on the 45X Credit, see Note 15, “Government Grants,” in the notes to the unaudited Condensed Consolidated Financial Statements.

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Quarterly Performance Trend

While our business is not highly seasonal in nature, we sometimes experience a timing lag between production and sales, which may result in volatility in our results of operations between periods. The timing lag may be the result of, or influenced by, factors such as the timing and duration of shipments or the time required to convert materials. In addition, quarterly production of concentrate and separated products is impacted by the timing of scheduled outages of our production facilities for maintenance, which typically occur in the second and fourth quarters. Finally, since we began production of separated rare earth materials in the third quarter of 2023, certain volumes of REO produced are further processed or rejected rather than sold as concentrate.

The following table presents our KPIs for the quarterly periods indicated:


	FY2024						FY2023								FY2022
(in whole units or dollars)	Q3		Q2		Q1		Q4		Q3		Q2		Q1		Q4		Q3
Rare earth concentrate
REO Production Volume (MTs)	13,742		9,084		11,151		9,257		10,766		10,863		10,671		10,485		10,886
REO Sales Volume (MTs)	9,729		5,839		9,332		7,174		9,177		10,271		10,215		10,816		10,676
Realized Price per REO MT	$	4,425	$	4,183	$	4,294	$	5,622	$	5,718	$	6,231	$	9,365	$	8,515	$	11,636
Separated NdPr products
NdPr Production Volume (MTs)	478		272		131		150		50		N/A		N/A		N/A		N/A
NdPr Sales Volume (MTs)	404		136		134		10		—		N/A		N/A		N/A		N/A
NdPr Realized Price per KG	$	47	$	48	$	62	$	70	N/A		N/A		N/A		N/A		N/A

N/A = Not applicable as there was either no NdPr production volume or no NdPr sales volume in these periods.

Liquidity and Capital Resources

Liquidity refers to our ability to generate sufficient cash flows to meet the cash requirements of our business operations, including working capital and capital expenditure needs, contractual obligations, debt service and other commitments. Since becoming a public company, our principal sources of liquidity have been the issuance of the 2026 Notes in March 2021, and net cash from operating activities. In addition, we issued the 2030 Notes in March 2024, resulting in net proceeds of $731.4 million prior to the use of a portion of these funds to repurchase the 2026 Notes, repurchase shares of our common stock, and purchase Capped Call Options, as discussed below. As of September 30, 2024, we had $866.5 million of cash, cash equivalents and short-term investments and $957.5 million of principal amount of long-term debt.

Our results of operations and cash flows depend in large part upon the market prices of REO and particularly the price of rare earth concentrate. Rare earth concentrate is not quoted on any major commodities market or exchange and demand is currently constrained to a relatively limited number of refiners, a significant majority of which are based in China. Although we believe that our cash flows from operations and cash on hand are adequate to meet our liquidity requirements for the foreseeable future, uncertainty continues to exist as to the market price of REO, as evidenced by the volatility experienced in 2022 and the significant decrease in the market price of REO subsequently experienced, primarily due to concerns over the global economic conditions and actual or perceived concerns over increases in the supply of and/or decreases in demand for rare earth products. The significant decrease in the market price of rare earth products negatively impacted our cash flows from operations and liquidity.

Our current working capital needs relate mainly to our mining, beneficiation, and separation operations. As we began the transition to selling separated rare earth products in 2023, our working capital needs increased materially, portions of which we expect to continue in 2024 as we ramp up the production and sales of separated rare earth products and advance our Stage III magnetics initiatives.

The completion of our mission to become a fully integrated domestic magnetics producer is expected to be capital intensive. With the construction portion of our Stage II optimization project complete, our principal capital expenditure requirements relate mainly to further investment in Mountain Pass, including the development of the HREE Facility, Upstream 60K, and other growth and investment projects, completing the buildout of the Fort Worth Facility, as well as periodic repairs and maintenance of mining and rare earth processing equipment. We expect to spend approximately $200 million of capital costs in 2024, with further costs for all of these identified projects in 2025. Our future capital requirements will also depend on several other factors, including market conditions, decisions regarding downstream production capability, and future acquisitions.

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Our estimated costs or estimated time to complete and commission these projects may increase, potentially significantly, due to factors outside of our control. While we believe that we have sufficient cash resources to fund these initiatives and operating working capital in the near term, we cannot assure this. If our available resources prove inadequate to fund our plans or commitments, we may be forced to revise our strategy and business plans or could be required, or elect, to seek additional funding through public or private equity or debt financings; however, such funding may not be available on terms acceptable to us, if at all. Any delays in our ongoing capital projects or substantial cost increases, including construction costs and related materials costs related to their execution, could significantly impact our ability to maximize our revenue opportunities and adversely impact our business and cash flows.

Debt and Other Long-Term Obligations

2026 Notes: In March 2021, we issued $690.0 million in aggregate principal amount of 0.25% unsecured convertible senior notes at a price of par. Interest on the 2026 Notes is payable on April 1st and October 1st of each year, beginning on October 1, 2021.

Contemporaneous with the pricing of the 2030 Notes, we entered into privately negotiated transactions with certain holders of the 2026 Notes to repurchase $400.0 million in aggregate principal amount of the 2026 Notes, using $358.0 million of the net proceeds from the offering of the 2030 Notes. The price we paid to repurchase the 2026 Notes, 89.5% of par value, was the same for each lender and approximated the trading price of the 2026 Notes at the time of the repurchases. Subsequent to the issuance of the 2030 Notes, we repurchased an additional $80.0 million in aggregate principal amount of the 2026 Notes in open market transactions for $70.6 million. As a result of these repurchases, we recorded a $46.3 million gain on early extinguishment of debt in the first quarter of 2024.

In March 2024, we provided a written notice to the trustee and the holders of the 2026 Notes that we have irrevocably elected to fix the settlement method for all conversions that may occur subsequent to the election date, to a combination of cash and shares of our common stock with the specified dollar amount per $1,000 principal amount of the 2026 Notes of $1,000. As a result, for any conversions of 2026 Notes occurring after the election date, a converting holder will receive (i) up to $1,000 in cash per $1,000 principal amount of the 2026 Notes and (ii) shares of our common stock for any conversion consideration in excess of $1,000 per $1,000 principal amount of the 2026 Notes converted. Prior to the election being made, we could have elected to settle the 2026 Notes in cash, shares of our common stock or a combination thereof.

2030 Notes: In March 2024, we issued $747.5 million in aggregate principal amount of 3.00% unsecured convertible senior notes that mature, unless earlier converted, redeemed or repurchased, on March 1, 2030, at a price of par. Interest on the 2030 Notes is payable on March 1st and September 1st of each year, beginning on September 1, 2024. In connection with the issuance, we recorded debt issuance costs of $19.9 million, of which $3.7 million was settled through the issuance of shares of our common stock.

The 2030 Notes are convertible into cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, at an initial conversion price of approximately $21.74 per share, or 45.9939 shares per $1,000 principal amount of 2030 Notes, subject to adjustment upon the occurrence of certain events. As of September 30, 2024, the maximum number of shares of common stock that could be issued to satisfy the conversion feature of the 2030 Notes was 48,132,646 shares of common stock.

Prior to December 1, 2029, at their election, holders of the 2030 Notes may convert their outstanding notes under the following circumstances: i) during any calendar quarter commencing with the third quarter of 2024 if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; ii) during the five business day period after any ten consecutive trading day period (the “Measurement Period”) in which the trading price (as defined in the indenture governing the 2030 Notes) per $1,000 principal amount of 2030 Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day; iii) if we call any or all of the 2030 Notes for redemption, the notes called for redemption may be converted at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or iv) upon the occurrence of specified corporate events set forth in the indenture governing the 2030 Notes. On or after December 1, 2029, and prior to the close of business on the second

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scheduled trading day immediately preceding the maturity date of the 2030 Notes, holders may convert their outstanding notes at any time, regardless of the foregoing circumstances.

We have the option to redeem for cash the 2030 Notes, in whole or in part, beginning on March 5, 2027, if certain conditions are met as set forth in the indenture governing the 2030 Notes. The redemption price is equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest.

If we undergo a fundamental change (as defined in the indenture governing the 2030 Notes), holders may require us to repurchase for cash all or any portion of their outstanding 2030 Notes at a price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest.

In addition, following certain corporate events that occur prior to the maturity date of the 2030 Notes or if we deliver a notice of early redemption, holders may, at their election, convert their outstanding 2030 Notes in connection with such event or notice, as applicable, and we will, in certain circumstances, increase the conversion rate but not to exceed 64.3915 shares per $1,000 principal amount of any converted 2030 Notes, subject to further adjustment upon the occurrence of certain events.

Capped Call Options: In March 2024, in connection with the offering of the 2030 Notes, we entered into privately negotiated capped call transactions (the “Capped Call Options”) with certain financial institutions (“Counterparties”). The Capped Call Options cover, subject to anti-dilution adjustments substantially similar to those in the 2030 Notes, 34.4 million shares of our common stock, the same number of shares that initially underlie the 2030 Notes. The Capped Call Options have an expiration date of March 1, 2030, subject to earlier exercise.

The Capped Call Options are expected generally to reduce the potential dilution to our common stock upon conversion of the 2030 Notes and/or offset cash payments we are required to make in excess of the principal amount of the converted 2030 Notes, as the case may be, in the event that the market price per share of our common stock, as measured under the terms of the Capped Call Options, is greater than the strike price of the Capped Call Options, which initially corresponds to the initial conversion price of the 2030 Notes, or approximately $21.74 per share of common stock, with such reduction and/or offset subject to an initial cap of $31.06 per share of our common stock.

Equipment Notes: We have financing agreements for the purchase of certain equipment, including trucks, tractors, loaders, graders, and various other machinery. As of September 30, 2024, we had $3.1 million in principal (and accrued interest) outstanding under the equipment notes. See Note 10, “Debt Obligations,” in the notes to the unaudited Condensed Consolidated Financial Statements for further information.

Leases: We have lease arrangements for certain equipment and facilities, including office space, vehicles and equipment used in our operations. As of September 30, 2024, we had future expected lease payment obligations totaling $9.7 million, with $2.3 million due within the next 12 months. See Note 11, “Leases,” in the notes to the unaudited Condensed Consolidated Financial Statements for further information.

Asset Retirement and Environmental Obligations: See Note 8, “Asset Retirement and Environmental Obligations,” in the notes to the unaudited Condensed Consolidated Financial Statements for our estimated cash requirements to settle asset retirement and environmental obligations.

Repurchases of Common Stock

In March 2024, our Board of Directors approved a share repurchase program (the “Program”) effective for one year under which the Company became authorized to repurchase up to an aggregate amount of $300.0 million of our outstanding common stock. In August 2024, our Board of Directors approved a $300.0 million increase to the Program, bringing the total authorized amount to $600.0 million. The Program was also extended and is effective until August 30, 2026. This authorization does not require the purchase of any minimum number of shares.

We may purchase shares from time to time at the discretion of management through open market purchases, privately negotiated transactions, block trades, accelerated or other structured share repurchase programs, or other means. The manner, timing, pricing and amount of any transactions will be subject to our discretion and may be based upon market conditions, regulatory requirements and alternative opportunities that we may have for the use or investment of our capital.

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During the nine months ended September 30, 2024, we repurchased 15.2 million shares of our common stock under the Program at an aggregate cost of $225.1 million. See Note 16, “Stockholders’ Equity and Stock-based Compensation,” in the notes to the unaudited Condensed Consolidated Financial Statements for additional information.

Cash Flows

The following table summarizes our cash flows:


	For the nine months ended September 30,				Change
(in thousands, except percentages)	2024		2023		$		%
Net cash provided by (used in):
Operating activities	$	(17,128)	$	76,480	$	(93,608)	N/M
Investing activities	$	31,697	$	337,831	$	(306,134)	(91)	%
Financing activities	$	6,037	$	(8,577)	$	14,614	N/M

N/M = Not meaningful.

Net Cash Provided by (Used in) Operating Activities: Net cash used in operating activities was $17.1 million for the nine months ended September 30, 2024, as compared to net cash provided by operating activities of $76.5 million in the prior year period. The change in cash flows from operating activities was primarily driven by a decrease in revenue and an increase in inventories to support commissioning of our Stage II separations facilities and the related change in working capital as we increase production of separated products. These decreases were partially offset by the receipt of a $50.0 million initial prepayment pursuant to the long-term supply agreement with GM for magnetic precursor materials and receipt of $19.4 million related to the 45X Credit claimed on our 2023 federal tax return.

Net Cash Provided by Investing Activities: Net cash provided by investing activities decreased by $306.1 million for the nine months ended September 30, 2024, as compared to the prior year period. The decrease in cash flows from investing activities was primarily driven by the net cash flow impact, which was $349.3 million, of a year-over-year increase in purchases of short-term investments, offset only partially by a small increase in proceeds from sales and maturities of short-term investments. Also, additions to property, plant and equipment for the nine months ended September 30, 2024, decreased by $43.2 million when compared to the prior year period, and related primarily to a decrease in construction spend on our Stage II optimization project given the timing of completion and placement into service.

Net Cash Provided by (Used in) Financing Activities: Net cash provided by financing activities was $6.0 million for the nine months ended September 30, 2024, as compared to net cash used in financing activities of $8.6 million in the prior year period. The change in cash flows from financing activities was driven by the net cash flow impact, which was $12.4 million, of the issuance of the 2030 Notes, the payments of debt issuance costs associated with the 2030 Notes, the payments made to retire a significant portion of the 2026 Notes, the purchase of the Capped Call Options, and the payments made to repurchase our common stock, all of which occurred during the nine months ended September 30, 2024.

Non-GAAP Financial Measures

We present Adjusted EBITDA, Adjusted Net Income (Loss), Adjusted Diluted EPS, and Free Cash Flow, which are non-GAAP financial measures that we use to supplement our results presented in accordance with GAAP. These measures may be similar to measures reported by other companies in our industry and are regularly used by securities analysts and investors to measure companies’ financial performance. Adjusted EBITDA, Adjusted Net Income (Loss), Adjusted Diluted EPS, and Free Cash Flow are not intended to be substitutes for any GAAP financial measures and, as calculated, may not be comparable to other similarly titled measures of performance or liquidity of other companies within our industry or in other industries.

Adjusted EBITDA

We define Adjusted EBITDA as our GAAP net income or loss before interest expense, net; income tax expense or benefit; and depreciation, depletion and amortization; further adjusted to eliminate the impact of stock-based compensation expense; initial start-up costs; transaction-related and other costs; accretion of asset retirement and environmental obligations; gain or loss on disposals of long-lived assets; gain or loss on early extinguishment of debt; and other income or loss. We present Adjusted EBITDA because it is used by management to evaluate our underlying operating and financial performance and trends. Adjusted EBITDA excludes certain expenses that are required in accordance with GAAP because they are non-recurring, non-cash or are not related to our underlying business performance. This non-GAAP financial measure is intended to

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supplement our GAAP results and should not be used as a substitute for financial measures presented in accordance with GAAP.

The following table presents a reconciliation of our Adjusted EBITDA, which is a non-GAAP financial measure, to our Net income (loss), which is determined in accordance with GAAP:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Adjusted for:
Depreciation, depletion and amortization	19,344		16,751		55,939		37,076
Interest expense, net	6,646		1,396		16,248		4,147
Income tax expense (benefit)	(9,350)		(200)		(16,304)		13,166
Stock-based compensation expense(1)	5,453		6,298		18,623		19,041
Initial start-up costs(2)	1,493		7,082		3,918		15,474
Transaction-related and other costs(3)	1,428		1,642		6,108		7,124
Accretion of asset retirement and environmental obligations(4)	234		227		695		681
Loss on disposals of long-lived assets, net(4)	420		1,087		720		5,897
Gain on early extinguishment of debt(5)	—		—		(46,265)		—
Other income, net	(11,320)		(14,456)		(36,061)		(41,970)
Adjusted EBITDA	$	(11,168)	$	15,551	$	(39,461)	$	101,202

(1)Principally included in “Selling, general and administrative” within our unaudited Condensed Consolidated Statements of Operations.

(2)Included in “Start-up costs” within our unaudited Condensed Consolidated Statements of Operations and excludes any applicable stock-based compensation, which is included in the “Stock-based compensation expense” line above. Relates to certain costs incurred in connection with the commissioning and starting up of our initial separations capability at Mountain Pass and our initial magnet-making capabilities at Fort Worth prior to the achievement of commercial production. These costs include labor of incremental employees hired in advance to work directly on such commissioning activities, training costs, costs of testing and commissioning the new circuits and processes, and other related costs. Given the nature and scale of the related costs and activities, management does not view these as normal, recurring operating expenses, but rather as non-recurring investments to initially develop our separations and magnet-making capabilities. Therefore, we believe it is useful and necessary for investors to understand our core operating performance in current and future periods by excluding the impact of these start-up costs. To the extent additional start-up costs are incurred in the future to expand our separations and magnet-making capabilities after initial achievement of commercial production (e.g., significantly expanding production capacity at an existing facility or building a new separations or magnet manufacturing facility), such costs would not be considered an adjustment for this non-GAAP financial measure.

(3)Principally included in “Advanced projects and development” within our unaudited Condensed Consolidated Statements of Operations, and pertains to legal, consulting, and advisory services, and other costs associated with specific transactions, including potential acquisitions, mergers, or other investments.

(4)Included in “Other operating costs and expenses” within our unaudited Condensed Consolidated Statements of Operations.

(5)Pertains to the gain recognized on the repurchase of $480.0 million aggregate principal amount of our 2026 Notes in March 2024.

Adjusted Net Income (Loss) and Adjusted Diluted EPS

We calculate Adjusted Net Income (Loss) as our GAAP net income or loss excluding the impact of stock-based compensation expense; initial start-up costs; transaction-related and other costs; gain or loss on disposals of long-lived assets; gain or loss on early extinguishment of debt; and other items that we do not consider representative of our underlying operations; adjusted to give effect to the income tax impact of such adjustments. We calculate Adjusted Diluted EPS as our GAAP diluted earnings or loss per share excluding the per share impact, using adjusted diluted weighted-average shares outstanding, of stock-based compensation expense; initial start-up costs; transaction-related and other costs; gain or loss on disposals of long-lived assets; gain or loss on early extinguishment of debt; and other items that we do not consider representative of our underlying operations; adjusted to give effect to the income tax impact of such adjustments. In addition, when appropriate, we include an adjustment to reverse the impact of applying the if-converted method to our 2026 Notes if necessary to reconcile between GAAP diluted earnings or loss per share and Adjusted Diluted EPS. When applicable, adjusted diluted weighted-average shares outstanding reflect the anti-dilutive impact of our Capped Call Options entered into in connection with the issuance of our 2030 Notes.

Adjusted Net Income (Loss) and Adjusted Diluted EPS exclude certain expenses that are required in accordance with GAAP because they are non-recurring, non-cash, or not related to our underlying business performance. To calculate the

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income tax impact of such adjustments on a year-to-date basis, we utilize an effective tax rate equal to our income tax expense excluding material discrete costs and benefits, with any impacts of changes in effective tax rate being recognized in the current period. We present Adjusted Net Income (Loss) and Adjusted Diluted EPS because it is used by management to evaluate our underlying operating and financial performance and trends. These non-GAAP financial measures are intended to supplement our GAAP results and should not be used as a substitute for financial measures presented in accordance with GAAP.

The following table presents a reconciliation of our Adjusted Net Income (Loss), which is a non-GAAP financial measure, to our Net income (loss), which is determined in accordance with GAAP:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Adjusted for:
Stock-based compensation expense(1)	5,453		6,298		18,623		19,041
Initial start-up costs(2)	1,493		7,082		3,918		15,474
Transaction-related and other costs(3)	1,428		1,642		6,108		7,124
Loss on disposals of long-lived assets, net(4)	420		1,087		720		5,897
Gain on early extinguishment of debt(5)	—		—		(46,265)		—
Other	—		(1)		—		(42)
Tax impact of adjustments above(6)	(2,912)		(4,806)		4,816		(12,684)

Adjusted Net Income (Loss)	$	(19,634)	$	7,026	$	(55,162)	$	75,376

(1)Principally included in “Selling, general and administrative” within our unaudited Condensed Consolidated Statements of Operations.

(4)Included in “Other operating costs and expenses” within our unaudited Condensed Consolidated Statements of Operations.

(5)Pertains to the gain recognized on the repurchase of $480.0 million aggregate principal amount of our 2026 Notes in March 2024.

(6)Tax impact of adjustments is calculated using an adjusted effective tax rate, which excludes the impact of discrete tax costs and benefits, to each adjustment. The adjusted effective tax rates were 33.1%, 28.5%, 29.8% and 26.7% for the three and nine months ended September 30, 2024 and 2023, respectively.

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The following table presents a reconciliation of our Adjusted Diluted EPS, which is a non-GAAP financial measure, to our diluted earnings (loss) per share, which is determined in accordance with GAAP:


	For the three months ended September 30,				For the nine months ended September 30,
	2024		2023		2024		2023
Diluted earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.44)	$	0.22
Adjusted for:
Stock-based compensation expense	0.04		0.03		0.11		0.10
Initial start-up costs	0.01		0.04		0.02		0.08
Transaction-related and other costs	0.01		0.01		0.04		0.04
Loss on disposals of long-lived assets, net	—		0.01		—		0.03
Gain on early extinguishment of debt	—		—		(0.27)		—

Tax impact of adjustments above(1)	(0.02)		(0.03)		0.03		(0.07)
2026 Notes if-converted method(2)	—		—		0.18		—

Adjusted Diluted EPS	$	(0.12)	$	0.04	$	(0.33)	$	0.40

Diluted weighted-average shares outstanding(3)	164,149,348		177,231,717		172,066,214		193,632,662
Assumed conversion of 2026 Notes(3)	—		—		(4,063,441)		—
Assumed conversion of restricted stock(4)	—		582,144		—		—
Assumed conversion of restricted stock units(4)	—		438,803		—		—

Adjusted diluted weighted-average shares outstanding(3)(4)	164,149,348		178,252,664		168,002,773		193,632,662

(1)Tax impact of adjustments is calculated using an adjusted effective tax rate, which excludes the impact of discrete tax costs and benefits, to each adjustment. The adjusted effective tax rates were 33.1%, 28.5%, 29.8% and 26.7% for the three and nine months ended September 30, 2024 and 2023, respectively.

(2)For the nine months ended September 30, 2024, since the 2026 Notes were dilutive for purposes of computing GAAP diluted loss per share but antidilutive for purposes of computing Adjusted Diluted EPS, within this reconciliation, we have included this adjustment to reverse the impact of applying the if-converted method to the 2026 Notes in the computation of GAAP diluted loss per share.

(3)For the nine months ended September 30, 2024, since the 2026 Notes were dilutive for purposes of computing GAAP diluted loss per share but antidilutive for purposes of computing Adjusted Diluted EPS, the adjusted diluted weighted-average shares outstanding excludes the potentially dilutive securities associated with the 2026 Notes.

(4)The assumed conversion of restricted stock and restricted stock units was antidilutive for GAAP purposes for the three months ended September 30, 2023. For purposes of calculating Adjusted Diluted EPS, we have added back the assumed conversion of restricted stock and restricted stock units since they would not be antidilutive when using Adjusted Net Income as the numerator in the calculation of Adjusted Diluted EPS.

Free Cash Flow

We calculate Free Cash Flow as net cash provided by or used in operating activities less additions to property, plant and equipment, net of proceeds from government awards used for construction. We believe Free Cash Flow is useful for comparing our ability to generate cash with that of our peers. The presentation of Free Cash Flow is not meant to be considered in isolation or as an alternative to cash flows from operating activities and does not necessarily indicate whether cash flows will be sufficient to fund cash needs.

The following table presents a reconciliation of our Free Cash Flow, which is a non-GAAP financial measure, to our net cash provided by (used in) operating activities, which is determined in accordance with GAAP:


	For the nine months ended September 30,
(in thousands)	2024		2023
Net cash provided by (used in) operating activities	$	(17,128)	$	76,480
Additions to property, plant and equipment, net(1)	(144,672)		(187,877)
Free Cash Flow	$	(161,800)	$	(111,397)

(1)Amounts for the nine months ended September 30, 2024 and 2023, are net of $0.1 million and $1.1 million, respectively, in proceeds from government awards used for construction.

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Critical Accounting Policies

A complete discussion of our critical accounting policies is included in our Form 10-K for the year ended December 31, 2023. There have been no significant changes in our critical accounting policies during the three months ended September 30, 2024.

Recently Adopted and Issued Accounting Pronouncements

Recently adopted and issued accounting pronouncements are described in Note 2, “Significant Accounting Policies,” in the notes to the unaudited Condensed Consolidated Financial Statements.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in our market risk exposures from the information presented in Part II, Item 7A. “Quantitative and Qualitative Disclosures About Market Risk,” in our Annual Report on Form 10-K for the year ended December 31, 2023, except as disclosed below.

Equity Market and Interest Rate Risks

While the fair values of our Convertible Notes are subject to interest rate risk, market risk and other factors due to their convertible feature, the Convertible Notes are more sensitive to the equity market price volatility of our stock price than changes in interest rates. The fair values of our Convertible Notes will generally increase as the price of our common stock increases and will generally decrease as the price of our common stock declines in value. The interest and market value changes affect the fair value of our Convertible Notes but do not impact our financial position, cash flows or results of operations due to the fixed nature of the debt obligations. Generally, the fair values of our Convertible Notes will increase as interest rates fall and decrease as interest rates rise. Over the past several years, the Federal Reserve raised interest rates in an effort to combat high inflation; however, with recent indicators that inflation is moderating, the Federal Reserve has recently begun to reduce interest rates. Despite this shift in U.S. policy, uncertainty persists in the market and economic conditions, including the possibility of additional measures that could be taken by the Federal Reserve and other government agencies, related to concerns over inflation risk.

See Note 10, “Debt Obligations,” in the notes to the unaudited Condensed Consolidated Financial Statements for further information on our Convertible Notes.

ITEM 4. CONTROLS AND PROCEDURES

The Company’s management, under the supervision and with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), as of September 30, 2024. Based on this evaluation, our principal executive officer and principal financial officer concluded that the Company’s disclosure controls and procedures were effective as of September 30, 2024, to ensure that information required to be disclosed by the Company in reports we file or submit under the Exchange Act is (i) recorded, processed, summarized, evaluated and reported, as applicable, within the time periods specified in the U.S. Securities and Exchange Commission’s rules and forms and (ii) accumulated and communicated to the Company’s management, including the Company’s principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosures.

There were no changes that occurred during the fiscal quarter covered by this Form 10-Q that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, we may be subject to legal and governmental proceedings and claims in the ordinary course of business. We are not currently a party to any material legal or governmental proceedings, and, to our knowledge, none is threatened.

ITEM 1A. RISK FACTORS

The Company’s business, reputation, results of operations and financial condition, as well as the price of the Company’s common stock, can be affected by a number of factors, whether currently known or unknown, including those described in Part I, Item 1A. “Risk Factors” in our Form 10-K for the year ended December 31, 2023 and in Part II, Item 1A. “Risk Factors” in

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our Form 10-Q for the quarterly period ended March 31, 2024. When any one or more of these risks materialize from time to time, the Company’s business, reputation, results of operations and financial condition, as well as the price of the Company’s common stock, can be materially and adversely affected. There have been no material changes to the risk factors disclosed in our Form 10-K for the year ended December 31, 2023 and our Form 10-Q for the quarterly period ended March 31, 2024.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer Purchases of Equity Securities

On August 30, 2024, the Company’s Board of Directors approved a $300.0 million increase to the Company’s existing share repurchase program and extended the share repurchase program’s expiration until August 30, 2026. The program was approved on March 1, 2024, and originally authorized the Company to repurchase up to an aggregate amount of $300.0 million of its outstanding common stock.

The following table provides information about shares of the Company’s common stock that were repurchased as part of the share repurchase program during the three months ended September 30, 2024:


(in thousands, except for share and price per share data)
Period	Total Number of Shares Purchased	Average Price Paid per Share(1)		Total Number of Shares Purchased as Part of Publicly Announced Program	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program
7/1/2024 - 7/31/2024	—	$	—	—	$	99,250
8/1/2024 - 8/31/2024	2,237,394	$	10.84	2,237,394	$	374,991
9/1/2024 - 9/30/2024	—	$	—	—	$	374,991
Total	2,237,394	$	10.84	2,237,394	$	374,991

(1)Average price paid per share is calculated on a settlement basis and excludes commissions paid and excise tax. Our share repurchases in excess of issuances are subject to a 1% excise tax enacted by the Inflation Reduction Act of 2022. Any excise tax incurred is recognized in stockholders’ equity as part of the cost basis of the shares acquired.

ITEM 4. MINE SAFETY DISCLOSURES

The information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95.1 to this Form 10-Q for the quarterly period ended September 30, 2024.

ITEM 5. OTHER INFORMATION

Securities Trading Plans of Directors and Executive Officers

During the three months ended September 30, 2024, none of the Company’s directors or officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934) adopted, terminated or modified 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 of the Securities Act of 1933).

T able of Contents

ITEM 6. EXHIBITS


Exhibit No.						Description












































31.1*						CEO Certification pursuant to rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes‑Oxley Act of 2002.

31.2*						CFO Certification pursuant to rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes‑Oxley Act of 2002.

32.1**						CEO Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002.

32.2**						CFO Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes‑Oxley Act of 2002.

95.1*						Mine Safety Disclosure pursuant to Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act.

101.INS						Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

101.SCH						Inline XBRL Taxonomy Extension Schema Document.

101.CAL						Inline XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF						Inline XBRL Taxonomy Extension Definition Linkbase Document.

101.LAB						Inline XBRL Taxonomy Extension Label Linkbase Document.

101.PRE						Inline XBRL Taxonomy Extension Presentation Linkbase Document.

104						Cover Page Inline XBRL File (included in Exhibit 101).

*						Filed herewith.

**						Furnished herewith.

T able of Contents

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.


	MP MATERIALS CORP.

Dated: November 8, 2024	By:	/s/ Ryan Corbett
		Ryan Corbett
		Chief Financial Officer

Exhibit 31.1

CERTIFICATION

I, James H. Litinsky, certify that:

1.I have reviewed this quarterly report on Form 10-Q of MP Materials Corp.;

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 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:

(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

5.The registrant’s other certifying officer 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):

(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.

Date: November 8, 2024

/s/ James H. Litinsky

James H. Litinsky

Chairman and Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, Ryan Corbett, certify that:

1.I have reviewed this quarterly report on Form 10-Q of MP Materials Corp.;

(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.

Date: November 8, 2024

/s/ Ryan Corbett

Ryan Corbett

Chief Financial Officer

Exhibit 32.1

CERTIFICATION PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002,

18 U.S.C. SECTION 1350

In connection with the quarterly report of MP Materials Corp. (the “Company”) on Form 10-Q for the fiscal quarter ended September 30, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, James H. Litinsky, Chairman and Chief Executive Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, 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, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 8, 2024

/s/ James H. Litinsky

James H. Litinsky

Chairman and Chief Executive Officer

Exhibit 32.2

CERTIFICATION PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002,

18 U.S.C. SECTION 1350

In connection with the quarterly report of MP Materials Corp. (the “Company”) on Form 10-Q for the fiscal quarter ended September 30, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Ryan Corbett, Chief Financial Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, 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, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 8, 2024

/s/ Ryan Corbett

Ryan Corbett

Chief Financial Officer

Exhibit 95.1

MINE SAFETY DISCLOSURE

Pursuant to Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), issuers that are operators, or that have a subsidiary that is an operator, of a coal or other mine in the United States are required to disclose in their periodic reports filed with the SEC information regarding specified health and safety violations, orders and citations, issued under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”) by the Mine Safety and Health Administration (the “MSHA”), as well as related assessments and legal actions, and mining-related fatalities.

The table below provides information for the three months ended September 30, 2024, at the Mountain Pass mine in San Bernardino County, California.

Additional information about the Mine Act and MSHA references used in the table follows:

•Section 104(a) Significant and Substantial (“S&S”) Citations: Citations received from MSHA under §104(a) of the Mine Act for violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of a mine safety or health hazard.

•Section 104(b) Orders: Orders issued by MSHA under §104(b) of the Mine Act, which represent a failure to abate a citation under §104(a) within the period of time prescribed by MSHA. This results in an order of immediate withdrawal from the area of the mine affected by the condition until MSHA determines that the violation has been abated.

•Section 104(d) S&S Citations and Orders: Citations and orders issued by MSHA under §104(d) of the Mine Act for unwarrantable failure to comply with mandatory, significant and substantial health or safety standards.

•Section 110(b)(2) Violations: Flagrant violations issued by MSHA under §110(b)(2) of the Mine Act.

•Section 107(a) Orders: Orders issued by MSHA under §107(a) of the Mine Act for situations in which MSHA determined an “imminent danger” (as defined by MSHA) existed.

Mine

Mine Act §104(a) S&S Citations

Mine Act §104(b) Orders

Mine Act §104(d) S&S Citations and Orders

Mine Act §110(b)(2) Violations

Mine Act §107(a) Orders

Proposed MSHA Assessments (in whole dollars)(1)

Mining Related Fatalities

Mine Act §104(e) Notice (Yes/No)(2)

Pending Legal Actions before Federal Mine Safety and Health Review Commission (Yes/No)

Mountain Pass

$11,069

(1)Includes a proposed MSHA assessment for one non-S&S citation issued during the three months ended June 30, 2024, and for one S&S citation issued during the three months ended December 31, 2023.

(2)A written notice from MSHA regarding a pattern of violations, or a potential to have such pattern under §104(e) of the Mine Act.

COVER - shares	9 Months Ended
COVER - shares	Sep. 30, 2024	Oct. 31, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-39277
Entity Registrant Name	MP Materials Corp. / DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-4465489
Entity Address, Address Line One	1700 S. Pavilion Center Drive, Suite 800
Entity Address, City or Town	Las Vegas
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89135
City Area Code	702
Local Phone Number	844-6111
Title of 12(b) Security	Common Stock, par value of $0.0001 per share
Trading Symbol	MP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		163,207,224
Amendment Flag	false
Entity Central Index Key	0001801368
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 284,434	$ 263,351
Short-term investments	582,056	734,493
Total cash, cash equivalents and short-term investments	866,490	997,844
Accounts receivable, net of allowance for credit losses of $0 and $0, respectively (including related party)	14,549	10,029
Inventories	116,699	95,182
Government grant receivable	7,846	19,302
Prepaid expenses and other current assets	11,599	8,820
Total current assets	1,017,183	1,131,177
Non-current assets
Property, plant and equipment, net	1,230,517	1,158,054
Operating lease right-of-use assets	9,004	10,065
Inventories	19,825	13,350
Equity method investment	8,962	9,673
Intangible assets, net	7,970	8,881
Other non-current assets	6,825	5,252
Total non-current assets	1,283,103	1,205,275
Total assets	2,300,286	2,336,452
Current liabilities
Accounts and construction payable	21,711	27,995
Accrued liabilities	66,224	73,939
Deferred revenue	50,000	0
Other current liabilities	8,854	6,616
Total current liabilities	146,789	108,550
Non-current liabilities
Asset retirement obligations	5,856	5,518
Environmental obligations	16,506	16,545
Long-term debt, net	937,634	681,980
Operating lease liabilities	6,016	6,829
Deferred government grant	19,836	17,433
Deferred income taxes	98,541	130,793
Other non-current liabilities	4,568	3,025
Total non-current liabilities	1,088,957	862,123
Total liabilities	1,235,746	970,673
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock ($0.0001 par value, 50,000,000 shares authorized, none issued and outstanding in either period)	0	0
Common stock ($0.0001 par value, 450,000,000 shares authorized, 178,439,486 and 178,082,383 shares issued, and 163,189,704 and 178,082,383 shares outstanding, as of September 30, 2024, and December 31, 2023, respectively)	18	17
Additional paid-in capital	948,687	979,891
Retained earnings	342,644	385,726
Accumulated other comprehensive income	296	145
Treasury stock, at cost, 15,249,782 and 0 shares, respectively	(227,105)	0
Total stockholders’ equity	1,064,540	1,365,779
Total liabilities and stockholders’ equity	$ 2,300,286	$ 2,336,452

CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 0	$ 0
Preferred stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, issued (in shares)	0	0
Preferred shares, outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	450,000,000	450,000,000
Common stock, issued (in shares)	178,439,486	178,082,383
Common stock, outstanding (in shares)	163,189,704	178,082,383
Treasury stock (in shares)	15,249,782	0

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Total revenue	$ 62,927	$ 52,516	$ 142,869	$ 212,240
Operating costs and expenses:
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	57,266	22,217	134,323	69,137
Selling, general and administrative	21,525	19,561	64,226	57,829
Depreciation, depletion and amortization	19,344	16,751	55,939	37,076
Start-up costs	1,627	7,336	4,287	16,125
Advanced projects and development	2,051	2,873	8,143	9,586
Other operating costs and expenses	654	1,314	1,415	6,578
Total operating costs and expenses	102,467	70,052	268,333	196,331
Operating income (loss)	(39,540)	(17,536)	(125,464)	15,909
Interest expense, net	(6,646)	(1,396)	(16,248)	(4,147)
Gain on early extinguishment of debt	0	0	46,265	0
Other income, net	11,320	14,456	36,061	41,970
Income (loss) before income taxes	(34,866)	(4,476)	(59,386)	53,732
Income tax benefit (expense)	9,350	200	16,304	(13,166)
Net income (loss)	$ (25,516)	$ (4,276)	$ (43,082)	$ 40,566
Earnings (loss) per share:
Basic EPS (in USD per share)	$ (0.16)	$ (0.02)	$ (0.26)	$ 0.23
Diluted (in USD per share)	$ (0.16)	$ (0.02)	$ (0.44)	$ 0.22
Weighted-average shares outstanding:
Basic (in shares)	164,149,348	177,231,717	168,002,773	177,034,068
Diluted (in shares)	164,149,348	177,231,717	172,066,214	193,632,662
Rare earth concentrate (including related party)
Total revenue	$ 43,053	$ 52,472	$ 107,555	$ 212,139
NdPr oxide and metal (including related party)
Total revenue	19,179	0	34,037	0
Other revenue
Total revenue	$ 695	$ 44	$ 1,277	$ 101

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (25,516)	$ (4,276)	$ (43,082)	$ 40,566
Other comprehensive income (loss), net of tax:
Change in net unrealized gains (losses) on available-for-sale securities	388	134	203	(221)
Foreign currency translation loss	(2)	0	(52)	0
Total comprehensive income (loss)	$ (25,130)	$ (4,142)	$ (42,931)	$ 40,345

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, Common
Beginning balance (in shares) at Dec. 31, 2022		0	177,706,608
Beginning balance at Dec. 31, 2022	$ 1,312,634	$ 0	$ 18	$ 951,008	$ 361,419	$ 189	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)			149,922
Stock-based compensation	20,607			20,607
Shares used to settle payroll tax withholding (in shares)			(206,434)
Shares used to settle payroll tax withholding	(6,476)		$ 1	(6,475)
Repurchases of common stock	8,963			8,963
Common stock issued to acquire intangible asset (in share)			152,504
Stock Issued During Period, Value, Issued for Services	0
Net income (loss)	40,566				40,566
Other Comprehensive Income (Loss), Net of Tax	(221)					(221)
Ending balance (in shares) at Sep. 30, 2023		0	177,802,600
Ending balance at Sep. 30, 2023	1,376,073	$ 0	$ 17	974,103	401,985	(32)	0
Beginning balance (in shares) at Jun. 30, 2023		0	177,626,668
Beginning balance at Jun. 30, 2023	1,364,931	$ 0	$ 17	958,819	406,261	(166)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)			37,236
Stock-based compensation	6,665			6,665
Shares used to settle payroll tax withholding (in shares)			(13,808)
Shares used to settle payroll tax withholding	(344)			(344)
Repurchases of common stock	8,963			8,963
Common stock issued to acquire intangible asset (in share)			152,504
Net income (loss)	(4,276)				(4,276)
Other Comprehensive Income (Loss), Net of Tax	134					134
Ending balance (in shares) at Sep. 30, 2023		0	177,802,600
Ending balance at Sep. 30, 2023	1,376,073	$ 0	$ 17	974,103	401,985	(32)	0
Beginning balance (in shares) at Dec. 31, 2023		0	178,082,383
Beginning balance at Dec. 31, 2023	1,365,779	$ 0	$ 17	979,891	385,726	145	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)			354,237
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture			$ 1
Stock-based compensation	18,908			18,907
Shares used to settle payroll tax withholding (in shares)			(281,370)
Shares used to settle payroll tax withholding	(4,577)			(4,577)
Repurchases of common stock	$ 0			0
Common stock issued to acquire intangible asset (in share)			43,573
Treasury Stock, Common, Shares	(15,200,000)		(15,249,782)
Treasury Stock, Value, Acquired, Cost Method	$ 227,105						227,105
Stock Issued During Period, Shares, Issued for Services			240,663
Stock Issued During Period, Value, Issued for Services	3,737			3,737
Capped Call Transaction Cost	49,271			49,271
Net income (loss)	(43,082)				(43,082)
Other Comprehensive Income (Loss), Net of Tax	151					151
Ending balance (in shares) at Sep. 30, 2024		0	163,189,704
Ending balance at Sep. 30, 2024	1,064,540	$ 0	$ 18	948,687	342,644	296	227,105
Beginning balance (in shares) at Jun. 30, 2024		0	165,331,382
Beginning balance at Jun. 30, 2024	1,109,038	$ 0	$ 18	943,508	368,160	(90)	202,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)			83,850
Stock-based compensation	5,632			5,632
Shares used to settle payroll tax withholding (in shares)			(31,707)
Shares used to settle payroll tax withholding	(453)			(453)
Repurchases of common stock	$ 0			0
Common stock issued to acquire intangible asset (in share)			43,573
Treasury Stock, Common, Shares	(2,200,000)		(2,237,394)
Treasury Stock, Value, Acquired, Cost Method	$ 24,547						24,547
Net income (loss)	(25,516)				(25,516)
Other Comprehensive Income (Loss), Net of Tax	386					386
Ending balance (in shares) at Sep. 30, 2024		0	163,189,704
Ending balance at Sep. 30, 2024	$ 1,064,540	$ 0	$ 18	$ 948,687	$ 342,644	$ 296	$ 227,105

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating activities:
Net income (loss)	$ (43,082)	$ 40,566
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	55,939	37,076
Accretion of discount on short-term investments	(23,669)	(17,334)
Gain on early extinguishment of debt	(46,265)	0
Stock-based compensation expense	18,623	19,041
Amortization of debt issuance costs	2,864	2,650
Lower of cost or net realizable value reserve	15,085	0
Deferred income taxes	(16,240)	13,156
Other	1,957	1,091
Decrease (increase) in operating assets:
Accounts receivable (including related party)	(4,520)	19,676
Inventories	(42,851)	(25,498)
Government grant receivable	11,456	0
Prepaid expenses, other current and non-current assets	(2,390)	(1,437)
Increase (decrease) in operating liabilities:
Accounts payable and accrued liabilities	(1,303)	8,601
Income taxes payable	0	(21,163)
Deferred revenue	50,000	0
Deferred government grant	4,086	0
Other current and non-current liabilities	3,182	55
Net cash provided by (used in) operating activities	(17,128)	76,480
Investing activities:
Additions to property, plant and equipment	(144,768)	(188,927)
Purchases of short-term investments	(1,150,609)	(705,241)
Proceeds from sales of short-term investments	131,776	461,042
Proceeds from maturities of short-term investments	1,195,202	769,907
Proceeds from government awards used for construction	96	1,050
Net cash provided by investing activities	31,697	337,831
Financing activities:
Proceeds from issuance of long-term debt	747,500	0
Payment of debt issuance costs	(16,149)	0
Payments to retire long-term debt	(428,599)	0
Purchase of capped call options	(65,332)	0
Repurchases of common stock	(225,068)	0
Principal payments on debt obligations and finance leases	(1,738)	(2,101)
Tax withholding on stock-based awards	(4,577)	(6,476)
Net cash provided by (used in) financing activities	6,037	(8,577)
Net change in cash, cash equivalents and restricted cash	20,606	405,734
Cash, cash equivalents and restricted cash beginning balance	264,988	143,509
Cash, cash equivalents and restricted cash ending balance	285,594	549,243
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	284,434	547,668
Restricted cash, current	811	1,228
Restricted cash, non-current	349	347
Total cash, cash equivalents and restricted cash	$ 285,594	$ 549,243

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	9 Months Ended
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Description of Business: MP Materials Corp., including its subsidiaries (the “Company” or “MP Materials”), is the largest producer of rare earth materials in the Western Hemisphere. The Company, which is headquartered in Las Vegas, Nevada, owns and operates the Mountain Pass Rare Earth Mine and Processing Facility (“Mountain Pass”), the only rare earth mining and processing site of scale in North America, and is constructing a rare earth metal, alloy and magnet manufacturing facility in Fort Worth, Texas (the “Fort Worth Facility”), where the Company anticipates manufacturing neodymium-iron-boron (“NdFeB”) permanent magnets and its precursor products. The Company produces rare earth concentrate products as well as refined rare earth oxides and related products. The rare earth concentrate is principally sold pursuant to the Offtake Agreements to Shenghe (as such terms are defined in Note 19, “Related-Party Transactions”), a related party of the Company, that, in turn, typically sells that product to refiners in China. In the second half of 2023, the Company began producing and selling separated rare earth products, including neodymium-praseodymium (“NdPr”) oxide. Additionally, the Company has a long-term agreement with General Motors Company (NYSE: GM) (“GM”) to supply U.S.-sourced and manufactured rare earth materials and finished magnets for the electric motors in more than a dozen GM models. In April 2024, pursuant to the long-term supply agreement with GM, the Company received a $50.0 million initial prepayment for magnetic precursor materials. See Note 2, “Significant Accounting Policies,” and Note 14, “Revenue Recognition,” for additional details. Operating segments are defined as components of an enterprise engaged in business activities, about which separate financial information is available and evaluated regularly by the chief operating decision maker (“CODM”), or decision-making group, in deciding how to allocate resources and in assessing performance. The Company’s CODM views the Company’s operations and manages the business as one reportable segment. The cash flows and profitability of the Company’s operations are significantly affected by the market price of rare earth products. The prices of rare earth products are affected by numerous factors beyond the Company’s control. The products of the Company are sold globally, with a primary focus in the Asian market due to the refining, metallization, and magnet manufacturing capabilities of the region. Rare earth products are critical inputs in hundreds of existing and emerging clean-tech applications including electric vehicles and wind turbines as well as robotics, drones, and defense applications. Basis of Presentation: The unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, since they are interim statements, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Results of operations and cash flows for the interim periods presented herein are not necessarily indicative of the results that would be achieved during a full year of operations or in future periods. These unaudited Condensed Consolidated Financial Statements and notes thereto should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Form 10-K.

SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2024
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation: The unaudited Condensed Consolidated Financial Statements include the accounts of MP Materials Corp. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Use of Estimates: The preparation of the unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect (i) the reported amounts of assets and liabilities, (ii) the disclosure of contingent assets and liabilities at the date of the unaudited Condensed Consolidated Financial Statements, and (iii) the reported amounts of revenues and expenses during the reporting period. Accordingly, actual results may differ from those estimates. Concentration of Risk: Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents and short-term investments, and receivables from customers. The Company believes that its credit risk is limited because the Company’s current contracts are with companies that have a reliable payment history. The Company does not believe that it is exposed to any significant risks related to its cash accounts, money market funds, or short-term investments. For the nine months ended September 30, 2024 and 2023, Shenghe was the Company’s principal customer and accounted for more than 80% and 90% of revenue, respectively. Rare earth concentrate is not quoted on any major commodities market or exchange and demand for rare earth concentrate is currently constrained to a relatively limited number of refiners, a significant majority of which are based in China. Uncertainty exists as to the market price of rare earth oxide (“REO”), as evidenced by the volatility experienced in 2022 and 2023 primarily due to concerns over the global economic conditions and actual or perceived concerns over increases in the supply of or slower growth in the demand for rare earth products. Furthermore, while revenue is generated in the U.S., Shenghe conducts its primary operations in China and may transport and sell products in the Chinese market. Therefore, the Company’s revenue is affected by Shenghe’s ultimate realized prices in China, including the impact of changes in the exchange rate between the Chinese yuan and the U.S. dollar. In addition, the ongoing economic conflict between China and the U.S., which has previously resulted in tariffs and trade barriers, may negatively affect the Company’s business and results of operations. See Note 19, “Related-Party Transactions,” for additional information. Deferred Revenue: Deferred revenue represents the Company’s obligation to transfer goods or services to a customer for which the Company has received consideration in advance of such transfer. Amounts expected to be recognized as revenue during the 12-month period after the balance sheet date are classified as current deferred revenue with the remainder classified as non-current in the Company’s unaudited Condensed Consolidated Balance Sheets. See “Contract Balances” in Note 14, “Revenue Recognition,” for additional information. Investment Tax Credits: An investment tax credit (“ITC”) represents a benefit provided by federal, state, or local governments to encourage an entity to invest in specific types of assets. An ITC is commonly calculated as a percentage of the investment cost of a qualifying asset and may be subject to the scope of Accounting Standards Codification (“ASC”) Topic 740, “Income Taxes” (“ASC 740”). The accounting for an ITC may depend upon certain factors, including whether or not the ITC is refundable and/or transferable. The Company elected to account for its nonrefundable, transferable ITCs under ASC 740. This type of ITC is recognized when the Company places into service a qualifying asset and determines that it will more-likely-than-not comply with the requirements to receive the ITC. Additionally, the Company elected to account for these ITCs under the deferral method whereby the Company will initially record such ITC as a deferred liability and subsequently recognize the ITC in the income statement as a reduction to income tax expense over the useful lives of the qualifying assets. As a result of the deferral method, the Company also elected to recognize immediately in income tax expense the deferred tax effect, net of any valuation allowance, as a result of such transaction. See also No te 12, “Income Taxes.” Capped Call Options: The Company’s Capped Call Options cover the aggregate number of shares of its common stock that initially underlie the 2030 Notes (as such terms are defined in Note 10, “Debt Obligations”), and generally reduce potential dilution to the Company’s common stock upon the conversion of the 2030 Notes and/or offset any cash payments the Company may make in excess of the principal amount of the converted 2030 Notes, as the case may be, with such reduction and/or offset subject to a cap, based on the cap price of the Capped Call Options. The Company determined that the Capped Call Options meet the definition of a freestanding derivative under ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), but are not required to be separately accounted for as a derivative as they meet the indexation and equity classification scope exception outlined in ASC 815. Accordingly, the Company recognized the cash paid to enter into the Capped Call Options contract during the first quarter of 2024 by recording an entry to “Additional paid-in capital” (“APIC”) in “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets. The Capped Call Options recorded in APIC will not be remeasured each reporting period. See Note 10, “Debt Obligations,” for additional information. Treasury Stock: Treasury stock represents shares of the Company’s common stock that have been reacquired after having been issued, and is accounted for under the cost method. Treasury stock is excluded from the Company’s outstanding shares and recorded as a reduction of “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets, unless the repurchased shares are immediately retired. Incremental direct costs to purchase treasury stock, such as excise taxes and commission fees, are included in the cost of the shares acquired. As of September 30, 2024, the outstanding balance of the excise tax liability was $2.0 million and was included in “Accrued liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. There was no outstanding excise tax liability balance as of December 31, 2023. Recently Issued Accounting Pronouncements: During the three and nine months ended September 30, 2024, there were no accounting pronouncements adopted by the Company that had a material impact on the Company’s unaudited Condensed Consolidated Financial Statements. The Company is currently evaluating the effect of adopting Accounting Standards Update (“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures,” and ASU No. 2023-09, “Improvements to Income Tax Disclosures,” on its disclosures. Reclassifications: Certain amounts in prior periods have been reclassified to conform to the current year presentation.

CASH, CASH EQUIVALENTS AND INVESTMENTS

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

CASH, CASH EQUIVALENTS AND INVESTMENTS

The following table presents the Company’s cash, cash equivalents and short-term investments:


	September 30, 2024								December 31, 2023
(in thousands)	Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash:
Demand deposits	$	5,406	$	—	$	—	$	5,406	$	2,795	$	—	$	—	$	2,795
Cash equivalents:
Money market funds	118,774		—		—		118,774		61,166		—		—		61,166

U.S. Treasury securities	68,669		13		—		68,682		92,113		14		—		92,127
Commercial paper	84,626		23		—		84,649		93,447		15		—		93,462
Certificates of deposit	6,672		1		—		6,673		13,799		2		—		13,801
Municipal securities	250		—		—		250		—		—		—		—
Total cash equivalents	278,991		37		—		279,028		260,525		31		—		260,556
Total cash and equivalents	284,397		37		—		284,434		263,320		31		—		263,351
Short-term investments:
U.S. agency securities	2,240		—		(1)		2,239		118,370		—		(78)		118,292
U.S. Treasury securities	562,072		429		(8)		562,493		615,962		249		(10)		616,201
Commercial paper	17,320		4		—		17,324		—		—		—		—
Total short-term investments	581,632		433		(9)		582,056		734,332		249		(88)		734,493
Total cash, cash equivalents and short-term investments	$	866,029	$	470	$	(9)	$	866,490	$	997,652	$	280	$	(88)	$	997,844

The Company recognized the following income and expense amounts, all of which are included in “Other income, net” within the Company’s unaudited Condensed Consolidated Statements of Operations:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Gross realized gains	$	3	$	1	$	6	$	506
Gross realized losses	$	1	$	—	$	15	$	139
Interest and investment income(1)	$	11,759	$	14,455	$	37,031	$	41,607

(1)Includes interest and investment income on the Company’s available-for-sale securities and other money market funds.

As of September 30, 2024, all outstanding available-for-sale investments had contractual maturities within one year and aggregated to a fair value of $742.3 million.

INVENTORIES

9 Months Ended

Sep. 30, 2024

Inventory Disclosure [Abstract]

INVENTORIES

The Company’s inventories consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Raw materials and supplies, including spare parts(1)	$	46,138	$	42,371
Mined ore stockpiles	30,300		28,507
Work in process	24,695		15,019
Finished goods	15,566		9,285
Total current inventories	116,699		95,182
Add: Non-current portion(2)	19,825		13,350
Total inventories	$	136,524	$	108,532

(1)Includes raw materials to support activities pertaining to the Company’s rare earth metal, alloy and magnet manufacturing capabilities.

PROPERTY, PLANT AND EQUIPMENT

9 Months Ended

Sep. 30, 2024

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

The Company’s property, plant and equipment consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Land and land improvements	$	40,254	$	27,091
Buildings and building improvements	95,236		92,203
Machinery and equipment	564,681		503,145
Assets under construction	262,994		211,848
Mineral rights	438,395		438,395
Property, plant and equipment, gross	1,401,560		1,272,682
Less: Accumulated depreciation and depletion	(171,043)		(114,628)
Property, plant and equipment, net	$	1,230,517	$	1,158,054

The Company’s depreciation and depletion expense were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Depreciation expense	$	16,018	$	13,951	$	46,012	$	28,385
Depletion expense	$	2,969	$	2,664	$	8,864	$	8,407

EQUITY METHOD INVESTMENTS	9 Months Ended
EQUITY METHOD INVESTMENTS	Sep. 30, 2024
Equity Method Investments and Joint Ventures [Abstract]
EQUITY METHOD INVESTMENTS	EQUITY METHOD INVESTMENT The Company’s equity method investment balance was $9.0 million and $9.7 million, as of September 30, 2024, and December 31, 2023, respectively, and pertains to the Company’s 49% equity interest in VREX Holdco Pte. Ltd. (“VREX Holdco”). VREX Holdco wholly owns Vietnam Rare Earth Company Limited (“VREX”), which owns and operates a metal processing plant and related facilities in Vietnam. The Company determined that VREX Holdco is a variable interest entity, but that the Company is not the primary beneficiary. Consequently, the Company does not consolidate VREX Holdco, and instead, accounts for its investment in VREX Holdco under the equity method of accounting as it has the ability to exercise significant influence, but not control, over VREX Holdco’s operating and financial policies. For the three and nine months ended September 30, 2024, the Company recognized $0.3 million and $0.6 million of Company’s share of VREX Holdco’s net loss, respectively, which was included in “Other income, net” within the Company’s unaudited Condensed Consolidated Statements of Operations. As of September 30, 2024, the tolling fees due to VREX Holdco pursuant to the Tolling Agreement (as defined and discussed in Note 19, “Related-Party Transactions,”) and capitalized to inventories that are subject to intra-entity profit or loss elimination were immaterial. As of September 30, 2024, the Company evaluated its equity method investment for impairment to determine if there were any events or changes in circumstances that would indicate if the carrying amount of its investment had experienced an “other-than-temporary” decline in value. No impairment charges were recorded during the three and nine months ended September 30, 2024.

INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

The Company’s intangible assets were as follows:


	September 30, 2024		December 31, 2023
(in thousands)
Intangible assets with indefinite lives:
Emissions allowances	$	302	$	316
Intangible assets with definite lives:
Patent and intellectual property license	8,963		8,963
Less: Accumulated amortization	(1,295)		(398)
Patent and intellectual property license, net	7,668		8,565
Intangible assets, net	$	7,970	$	8,881

ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS	9 Months Ended
ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS	Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]
ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS	ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS Asset Retirement Obligations The Company estimates asset retirement obligations based on the requirements to reclaim certain land areas associated with mineral extraction activities and certain related facilities at Mountain Pass. Minor reclamation activities related to discrete portions of the Company’s operations are ongoing. As of September 30, 2024, the Company estimated a significant portion of the cash outflows for major reclamation activities including the retirement of Mountain Pass will be incurred beginning in 2056. As of September 30, 2024, the credit-adjusted risk-free rate ranged between 6.5% and 12.0% depending on the timing of expected settlement and when the increment was recognized. There were no significant increments or decrements for the three and nine months ended September 30, 2024 and 2023. The balance as of both September 30, 2024 and December 31, 2023, included current portions of $0.2 million, which are included in “Other current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. The total estimated future undiscounted cash flows required to satisfy the Company’s asset retirement obligations were $52.5 million and $50.2 million as of September 30, 2024, and December 31, 2023, respectively. Environmental Obligations The Company has certain environmental monitoring and remediation obligations related to the monitoring of groundwater contamination. The Company engaged an environmental consultant to develop a remediation plan and remediation cost projections based upon that plan. Utilizing the consultant’s plan, the Company developed an estimate of future cash payments for the environmental obligations. As of September 30, 2024, the Company estimated the cash outflows related to these environmental activities will be incurred annually over the next 23 years. The Company’s environmental obligations are measured at the expected value of future cash outflows discounted to their present value using a discount rate of 2.93%. There were no significant changes in the estimated remaining remediation costs for the three and nine months ended September 30, 2024 and 2023. The total estimated aggregate undiscounted cost of $26.3 million and $26.7 million as of September 30, 2024, and December 31, 2023, respectively, principally related to water monitoring activities required by state and local agencies. Based on the Company’s estimate of the cost and timing and the assumption that payments are considered to be fixed and reliably determinable, the Company has discounted the liability. The balance as of both September 30, 2024, and December 31, 2023, included current portions of $0.5 million, which are included in “Other current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. Financial Assurances The Company is required to provide certain government agencies with financial assurances relating to closure and reclamation obligations. As of September 30, 2024, and December 31, 2023, the Company had financial assurance requirements of $45.5 million and $45.4 million, respectively, which were satisfied with surety bonds placed with applicable California state and regional agencies.

ACCRUED LIABILITIES

9 Months Ended

Sep. 30, 2024

Payables and Accruals [Abstract]

ACCRUED LIABILITIES

The Company’s accrued liabilities consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Accrued payroll and related	$	16,396	$	14,499
Accrued construction costs	35,258		46,976
Accrued taxes	4,926		3,373
Other accrued liabilities	9,644		9,091
Accrued liabilities	$	66,224	$	73,939

DEBT OBLIGATIONS

9 Months Ended

Sep. 30, 2024

Debt Disclosure [Abstract]

DEBT OBLIGATIONS

The Company’s long-term debt, net, was as follows:


	September 30, 2024						December 31, 2023
(in thousands)	Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount		Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount
Convertible Notes due 2026	$	210,000	$	(1,638)	$	208,362	$	690,000	$	(8,020)	$	681,980
Convertible Notes due 2030	747,500		(18,228)		729,272		—		—		—
Total long-term debt outstanding	$	957,500	$	(19,866)	$	937,634	$	690,000	$	(8,020)	$	681,980

Convertible Notes due 2026

Convertible Notes due 2030

Capped Call Options

Interest expense related to the Convertible Notes was as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Coupon interest	$	5,738	$	431	$	13,389	$	1,293
Amortization of debt issuance costs	973		884		2,864		2,650
Convertible Notes interest expense	$	6,711	$	1,315	$	16,253	$	3,943

Equipment Notes


	September 30, 2024		December 31, 2023
(in thousands)
Equipment notes
Current	$	2,074	$	2,106
Non-current	1,073		2,637
	$	3,147	$	4,743

As of September 30, 2024, none of the agreements or indentures governing the Company’s indebtedness contain financial covenants.

LEASES

9 Months Ended

Sep. 30, 2024

Leases [Abstract]

LEASES

Supplemental disclosure for the unaudited Condensed Consolidated Balance Sheets related to the Company’s operating and finance leases is as follows:


	Location on Unaudited Condensed Consolidated Balance Sheets	September 30, 2024		December 31, 2023
(in thousands)
Operating leases:
Right-of-use assets	Operating lease right-of-use assets	$	9,004	$	10,065

Operating lease liability, current	Other current liabilities	$	1,057	$	959
Operating lease liability, non-current	Operating lease liabilities	6,016		6,829
Total operating lease liabilities		$	7,073	$	7,788

Finance leases:
Right-of-use assets	Other non-current assets	$	1,002	$	591

Finance lease liability, current	Other current liabilities	$	566	$	195
Finance lease liability, non-current	Other non-current liabilities	442		388
Total finance lease liabilities		$	1,008	$	583

LEASES

Supplemental disclosure for the unaudited Condensed Consolidated Balance Sheets related to the Company’s operating and finance leases is as follows:


	Location on Unaudited Condensed Consolidated Balance Sheets	September 30, 2024		December 31, 2023
(in thousands)
Operating leases:
Right-of-use assets	Operating lease right-of-use assets	$	9,004	$	10,065

Operating lease liability, current	Other current liabilities	$	1,057	$	959
Operating lease liability, non-current	Operating lease liabilities	6,016		6,829
Total operating lease liabilities		$	7,073	$	7,788

Finance leases:
Right-of-use assets	Other non-current assets	$	1,002	$	591

Finance lease liability, current	Other current liabilities	$	566	$	195
Finance lease liability, non-current	Other non-current liabilities	442		388
Total finance lease liabilities		$	1,008	$	583

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company calculates the provision for income taxes during interim reporting periods by applying an estimate of the annual effective tax rate to its year-to-date pretax book income or loss. The tax effects of discrete items, including but not limited to, excess tax benefits or deficiencies associated with stock-based compensation, valuation allowance adjustments based on new evidence, and enactment of tax laws, are reported in the interim period in which they occur. The effective tax rate (income tax expense or benefit as a percentage of income or loss before income taxes) including discrete items was 26.8% and 27.5% for the three and nine months ended September 30, 2024, respectively, as compared to 4.5% and 24.5% for the three and nine months ended September 30, 2023, respectively. The Company’s effective income tax rate can vary from period to period depending on, among other factors, percentage depletion, executive compensation deduction limitations, the Section 45X Advanced Manufacturing Production Credit (the “45X Credit”), and changes to its valuation allowance against deferred tax assets. Certain of these and other factors, including the Company’s history and projections of pretax earnings, are considered in assessing its ability to realize its net deferred tax assets. In March 2024, the Company was awarded a $58.5 million Section 48C Qualifying Advanced Energy Project Tax Credit (the “48C Credit”) to advance the construction on its Fort Worth Facility. The 48C Credit is an investment tax credit equal to 30% of qualified investments for certified projects that meet prevailing wage and apprenticeship requirements and are placed in service after the date of the award. The 48C Credit is not eligible for direct pay (i.e., it is nonrefundable); however, it is transferable to an unrelated taxpayer at a negotiated rate. As of September 30, 2024, the Company had placed into service certified projects and recognized a $3.4 million 48C Credit, which was recorded to income tax receivable, included in “Prepaid expenses and other current assets,” and deferred investment tax credit, included primarily in “Other non-current liabilities” within the Company’s unaudited Condensed Consolidated Balance Sheets. This amount will be recognized as a reduction to income tax expense on a straight-line basis over the estimated useful life of the associated long-lived assets.

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Litigation: The Company may become party to lawsuits, administrative proceedings, and government investigations, including environmental, regulatory, construction, and other matters, in the ordinary course of business. Large, and sometimes unspecified, damages or penalties may be sought in some matters, and certain matters may require years to resolve. Other than the matter described below, the Company is not aware of any pending or threatened litigation that it believes would have a material adverse effect on its unaudited Condensed Consolidated Financial Statements. The Company is currently in a dispute with a general contractor for a construction project, which is scheduled to go to binding arbitration. The Company disputes that it owes any monies (and believes it has a valid claim against the contractor) in connection with this construction project. The Company is unable to estimate a range of loss, if any, at this time. If an unfavorable outcome were to occur in the binding arbitration, it is possible that the impact could be material to the Company’s unaudited Condensed Consolidated Financial Statements in the period in which any such outcome becomes probable and reasonably estimable.

REVENUE RECOGNITION

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

The following table disaggregates the Company’s revenue from contracts with customers by type of good sold, which are transferred to customers at a point in time:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Rare earth concentrate	$	43,053	$	52,472	$	107,555	$	212,139
NdPr oxide and metal	19,179		—		34,037		—
Other revenue	695		44		1,277		101
Total revenue	$	62,927	$	52,516	$	142,869	$	212,240

GOVERNMENT GRANTS	9 Months Ended
GOVERNMENT GRANTS	Sep. 30, 2024
Government Assistance [Abstract]
GOVERNMENT GRANTS	GOVERNMENT GRANTS Asset-Based Grants: In November 2020, the Company was awarded a Defense Production Act Title III technology investment agreement (“TIA”) from the Department of Defense (“DOD”) to establish domestic processing for separated light rare earth elements in the amount of $9.6 million. During the nine months ended September 30, 2024, the Company received $0.1 million in reimbursements from the DOD, which was the final reimbursement expected under the TIA. There were no reimbursements received for the nine months ended September 30, 2023. In February 2022, the Company was awarded a $35.0 million contract by the DOD’s Office of Industrial Base Analysis and Sustainment program to design and build a facility to process heavy rare earth elements (“HREE”) at Mountain Pass (the “HREE Facility”) (the “HREE Production Project Agreement”). During the nine months ended September 30, 2024 and 2023, the Company had received zero and $1.1 million, respectively, from the DOD under the HREE Production Project Agreement. Income-Based Grants: In August 2022, the U.S. government enacted the Inflation Reduction Act of 2022, which, among other things, promotes clean energy adoption by providing several tax incentives for the domestic production and sale of eligible components for tax years beginning after December 31, 2022. Specifically, the 45X Credit provides a credit equal to 10% of eligible “production costs incurred” with respect to the production and sale of critical minerals, including NdPr oxide. In October 2024, the Internal Revenue Service released final regulations on the 45X Credit, which among other things, added direct and indirect materials costs, including costs related to the extraction or acquisition of raw materials, to the definition of “production costs incurred,” which were previously excluded from the definition under the proposed regulations released in December 2023. The impact of the new guidance, including a cumulative adjustment to reflect the inclusion of direct and indirect costs on previous sales, will be accounted for in the fourth quarter of 2024. The Company accounts for the 45X Credit as an income-based grant as it is not within the scope of ASC 740 due to it being refundable. As of September 30, 2024 and December 31, 2023, the government grant receivable and deferred government grant within the Company’s unaudited Condensed Consolidated Balance Sheets pertained to the 45X Credit. During the third quarter of 2024, the Company received $19.4 million related to the 45X Credit claimed on its 2023 federal tax return. The current portion of deferred government grant, which is included in “Other current liabilities,” was $2.0 million and $1.7 million as of September 30, 2024 and December 31, 2023, respectively. For the three and nine months ended September 30, 2024, the benefits recognized in the Company’s unaudited Condensed Consolidated Statements of Operations pertaining to the 45X Credit, which are included as reductions to “Cost of sales (excluding depreciation, depletion and amortization) (including related party),” were $1.4 million and $3.8 million, respectively, and to “Depreciation, depletion and amortization,” were $0.5 million and $1.4 million, respectively. There were no benefits recognized from income-based government grants for the three and nine months ended September 30, 2023.

STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION

Treasury Stock

As of September 30, 2024, $375.0 million was available for additional share repurchases under the Program.

Capped Call Options

Stock-Based Compensation

The Company’s stock-based compensation was recorded as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	$	713	$	842	$	2,789	$	2,759
Selling, general and administrative	4,532		5,193		15,070		15,603
Start-up costs	134		254		369		651
Advanced projects and development	74		9		395		28
Total stock-based compensation expense	$	5,453	$	6,298	$	18,623	$	19,041

Stock-based compensation capitalized to property, plant and equipment, net	$	491	$	367	$	597	$	1,566

FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS


Level 1:						Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2:						Quoted prices in markets that are not active, quoted prices for similar assets or liabilities in active markets, quoted prices or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability and model-based valuation techniques (e.g., the Black-Scholes model) for which all significant inputs are observable in active markets.

Level 3:						Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).

Cash, Cash Equivalents and Restricted Cash

Short-term Investments

Convertible Notes

The fair value of the Company’s Convertible Notes is estimated based on quoted prices in active markets and is classified as a Level 1 measurement.

Equipment Notes


	September 30, 2024
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	284,434	$	284,434	$	284,434	$	—	$	—
Short-term investments	$	582,056	$	582,056	$	582,056	$	—	$	—
Restricted cash	$	1,160	$	1,160	$	1,160	$	—	$	—
Financial liabilities:
2026 Notes	$	208,362	$	192,938	$	192,938	$	—	$	—
2030 Notes	$	729,272	$	823,812	$	823,812	$	—	$	—
Equipment notes	$	3,147	$	3,114	$	—	$	3,114	$	—


	December 31, 2023
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	263,351	$	263,351	$	263,351	$	—	$	—
Short-term investments	$	734,493	$	734,493	$	734,493	$	—	$	—
Restricted cash	$	1,637	$	1,637	$	1,637	$	—	$	—
Financial liabilities:
2026 Notes	$	681,980	$	619,496	$	619,496	$	—	$	—
Equipment notes	$	4,743	$	4,628	$	—	$	4,628	$	—

EARNINGS (LOSS) PER SHARE

9 Months Ended

Sep. 30, 2024

Earnings Per Share [Abstract]

EARNINGS (LOSS) PER SHARE


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
Weighted-average shares outstanding, basic	164,149,348	177,231,717	168,002,773	177,034,068
Assumed conversion of 2026 Notes	—	—	4,063,441	15,584,409

Assumed conversion of restricted stock	—	—	—	620,190
Assumed conversion of RSUs	—	—	—	393,995

Weighted-average shares outstanding, diluted	164,149,348	177,231,717	172,066,214	193,632,662

The following table presents unweighted potentially dilutive shares that were not included in the computation of diluted earnings (loss) per share because to do so would have been antidilutive:


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
2026 Notes	—	15,584,409	—	—
2030 Notes	34,380,440	—	34,380,440	—
Restricted Stock	342,601	685,202	342,601	—
RSUs	1,762,523	1,629,938	1,762,523	3,184
Total	36,485,564	17,899,549	36,485,564	3,184

The following table presents the calculation of basic and diluted earnings (loss) per share for the Company’s common stock:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands, except share and per share data)	2024		2023		2024		2023
Calculation of basic earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Weighted-average shares outstanding, basic	164,149,348		177,231,717		168,002,773		177,034,068
Basic earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.26)	$	0.23

Calculation of diluted earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Interest expense, net of tax(1):
2026 Notes(2)	—		—		770		2,977
Gain on early extinguishment of debt(1)(2)(3)	—		—		(33,563)		—
Diluted income (loss)	$	(25,516)	$	(4,276)	$	(75,875)	$	43,543
Weighted-average shares outstanding, diluted	164,149,348		177,231,717		172,066,214		193,632,662
Diluted earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.44)	$	0.22

(1)The nine months ended September 30, 2024 and 2023, were tax-effected at a rate of 27.5% and 24.5%, respectively.

(3)Pertains to the 2026 Notes, a portion of which were repurchased during the nine months ended September 30, 2024.

RELATED PARTY TRANSACTIONS

9 Months Ended

Sep. 30, 2024

RELATED PARTY TRANSACTIONS

RELATED-PARTY TRANSACTIONS

Revenue and Cost of Sales: The Company’s related-party revenue and cost of sales were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Revenue:
Rare earth concentrate	$	43,053	$	51,502	$	107,555	$	203,186
NdPr oxide and metal	$	5,061	$	—	$	7,306	$	—

Cost of sales (excluding depreciation, depletion and amortization)	$	38,139	$	21,829	$	78,848	$	66,817

respectively, as compared to $5.8 million and $7.6 million for the three and nine months ended September 30, 2023, respectively.

SUPPLEMENTAL CASH FLOW INFORMATION

9 Months Ended

Sep. 30, 2024

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

Supplemental cash flow information and non-cash investing and financing activities were as follows:


	For the nine months ended September 30,
(in thousands)	2024		2023
Supplemental cash flow information:
Cash paid for interest	$	11,796	$	1,116
Cash payments related to income taxes(1)	$	—	$	23,101
Change in construction payables and accrued construction costs	$	(14,756)	$	10,952
Supplemental non-cash investing and financing activities:
Common stock issued to acquire intangible asset	$	—	$	8,963
Common stock issued in exchange for financial advisory services	$	3,737	$	—
Operating right-of-use assets obtained in exchange for lease liabilities	$	—	$	7,608

Excise tax obligation related to repurchases of common stock	$	2,037	$	—

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)	$ (25,516)	$ (4,276)	$ (43,082)	$ 40,566

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
SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	The unaudited Condensed Consolidated Financial Statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, since they are interim statements, they do not include all of the information and notes required by GAAP for complete consolidated financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Results of operations and cash flows for the interim periods presented herein are not necessarily indicative of the results that would be achieved during a full year of operations or in future periods. These unaudited Condensed Consolidated Financial Statements and notes thereto should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Form 10-K.
Principles of Consolidation	The unaudited Condensed Consolidated Financial Statements include the accounts of MP Materials Corp. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	The preparation of the unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect (i) the reported amounts of assets and liabilities, (ii) the disclosure of contingent assets and liabilities at the date of the unaudited Condensed Consolidated Financial Statements, and (iii) the reported amounts of revenues and expenses during the reporting period. Accordingly, actual results may differ from those estimates.
Concentration of Risk	Financial instruments that potentially subject the Company to credit risk consist principally of cash, cash equivalents and short-term investments, and receivables from customers. The Company believes that its credit risk is limited because the Company’s current contracts are with companies that have a reliable payment history. The Company does not believe that it is exposed to any significant risks related to its cash accounts, money market funds, or short-term investments. For the nine months ended September 30, 2024 and 2023, Shenghe was the Company’s principal customer and accounted for more than 80% and 90% of revenue, respectively. Rare earth concentrate is not quoted on any major commodities market or exchange and demand for rare earth concentrate is currently constrained to a relatively limited number of refiners, a significant majority of which are based in China. Uncertainty exists as to the market price of rare earth oxide (“REO”), as evidenced by the volatility experienced in 2022 and 2023 primarily due to concerns over the global economic conditions and actual or perceived concerns over increases in the supply of or slower growth in the demand for rare earth products. Furthermore, while revenue is generated in the U.S., Shenghe conducts its primary operations in China and may transport and sell products in the Chinese market. Therefore, the Company’s revenue is affected by Shenghe’s ultimate realized prices in China, including the impact of changes in the exchange rate between the Chinese yuan and the U.S. dollar. In addition, the ongoing economic conflict between China and the U.S., which has previously resulted in tariffs and trade barriers, may negatively affect the Company’s business and results of operations.
Deferred Revenue	Deferred revenue represents the Company’s obligation to transfer goods or services to a customer for which the Company has received consideration in advance of such transfer. Amounts expected to be recognized as revenue during the 12-month period after the balance sheet date are classified as current deferred revenue with the remainder classified as non-current in the Company’s unaudited Condensed Consolidated Balance Sheets.
Investment Tax Credits	An investment tax credit (“ITC”) represents a benefit provided by federal, state, or local governments to encourage an entity to invest in specific types of assets. An ITC is commonly calculated as a percentage of the investment cost of a qualifying asset and may be subject to the scope of Accounting Standards Codification (“ASC”) Topic 740, “Income Taxes” (“ASC 740”). The accounting for an ITC may depend upon certain factors, including whether or not the ITC is refundable and/or transferable. The Company elected to account for its nonrefundable, transferable ITCs under ASC 740. This type of ITC is recognized when the Company places into service a qualifying asset and determines that it will more-likely-than-not comply with the requirements to receive the ITC. Additionally, the Company elected to account for these ITCs under the deferral method whereby the Company will initially record such ITC as a deferred liability and subsequently recognize the ITC in the income statement as a reduction to income tax expense over the useful lives of the qualifying assets. As a result of the deferral method, the Company also elected to recognize immediately in income tax expense the deferred tax effect, net of any valuation allowance, as a result of such transaction.
Capped Call Options	The Company’s Capped Call Options cover the aggregate number of shares of its common stock that initially underlie the 2030 Notes (as such terms are defined in Note 10, “Debt Obligations”), and generally reduce potential dilution to the Company’s common stock upon the conversion of the 2030 Notes and/or offset any cash payments the Company may make in excess of the principal amount of the converted 2030 Notes, as the case may be, with such reduction and/or offset subject to a cap, based on the cap price of the Capped Call Options.The Company determined that the Capped Call Options meet the definition of a freestanding derivative under ASC Topic 815, “Derivatives and Hedging” (“ASC 815”), but are not required to be separately accounted for as a derivative as they meet the indexation and equity classification scope exception outlined in ASC 815. Accordingly, the Company recognized the cash paid to enter into the Capped Call Options contract during the first quarter of 2024 by recording an entry to “Additional paid-in capital” (“APIC”) in “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets. The Capped Call Options recorded in APIC will not be remeasured each reporting period.
Treasury Stock	Treasury stock represents shares of the Company’s common stock that have been reacquired after having been issued, and is accounted for under the cost method. Treasury stock is excluded from the Company’s outstanding shares and recorded as a reduction of “Stockholders’ equity” within the Company’s unaudited Condensed Consolidated Balance Sheets, unless the repurchased shares are immediately retired. Incremental direct costs to purchase treasury stock, such as excise taxes and commission fees, are included in the cost of the shares acquired.
Recently Issued Accounting Pronouncements	During the three and nine months ended September 30, 2024, there were no accounting pronouncements adopted by the Company that had a material impact on the Company’s unaudited Condensed Consolidated Financial Statements. The Company is currently evaluating the effect of adopting Accounting Standards Update (“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures,” and ASU No. 2023-09, “Improvements to Income Tax Disclosures,” on its disclosures.
Reclassifications	Certain amounts in prior periods have been reclassified to conform to the current year presentation.

CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Debt Securities, Available-for-Sale

The following table presents the Company’s cash, cash equivalents and short-term investments:


	September 30, 2024								December 31, 2023
(in thousands)	Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash:
Demand deposits	$	5,406	$	—	$	—	$	5,406	$	2,795	$	—	$	—	$	2,795
Cash equivalents:
Money market funds	118,774		—		—		118,774		61,166		—		—		61,166

U.S. Treasury securities	68,669		13		—		68,682		92,113		14		—		92,127
Commercial paper	84,626		23		—		84,649		93,447		15		—		93,462
Certificates of deposit	6,672		1		—		6,673		13,799		2		—		13,801
Municipal securities	250		—		—		250		—		—		—		—
Total cash equivalents	278,991		37		—		279,028		260,525		31		—		260,556
Total cash and equivalents	284,397		37		—		284,434		263,320		31		—		263,351
Short-term investments:
U.S. agency securities	2,240		—		(1)		2,239		118,370		—		(78)		118,292
U.S. Treasury securities	562,072		429		(8)		562,493		615,962		249		(10)		616,201
Commercial paper	17,320		4		—		17,324		—		—		—		—
Total short-term investments	581,632		433		(9)		582,056		734,332		249		(88)		734,493
Total cash, cash equivalents and short-term investments	$	866,029	$	470	$	(9)	$	866,490	$	997,652	$	280	$	(88)	$	997,844

Schedule of Cash and Cash Equivalents

The following table presents the Company’s cash, cash equivalents and short-term investments:


	September 30, 2024								December 31, 2023
(in thousands)	Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Amortized Cost Basis		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash:
Demand deposits	$	5,406	$	—	$	—	$	5,406	$	2,795	$	—	$	—	$	2,795
Cash equivalents:
Money market funds	118,774		—		—		118,774		61,166		—		—		61,166

U.S. Treasury securities	68,669		13		—		68,682		92,113		14		—		92,127
Commercial paper	84,626		23		—		84,649		93,447		15		—		93,462
Certificates of deposit	6,672		1		—		6,673		13,799		2		—		13,801
Municipal securities	250		—		—		250		—		—		—		—
Total cash equivalents	278,991		37		—		279,028		260,525		31		—		260,556
Total cash and equivalents	284,397		37		—		284,434		263,320		31		—		263,351
Short-term investments:
U.S. agency securities	2,240		—		(1)		2,239		118,370		—		(78)		118,292
U.S. Treasury securities	562,072		429		(8)		562,493		615,962		249		(10)		616,201
Commercial paper	17,320		4		—		17,324		—		—		—		—
Total short-term investments	581,632		433		(9)		582,056		734,332		249		(88)		734,493
Total cash, cash equivalents and short-term investments	$	866,029	$	470	$	(9)	$	866,490	$	997,652	$	280	$	(88)	$	997,844

Interest and Other Income

The Company recognized the following income and expense amounts, all of which are included in “Other income, net” within the Company’s unaudited Condensed Consolidated Statements of Operations:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Gross realized gains	$	3	$	1	$	6	$	506
Gross realized losses	$	1	$	—	$	15	$	139
Interest and investment income(1)	$	11,759	$	14,455	$	37,031	$	41,607

(1)Includes interest and investment income on the Company’s available-for-sale securities and other money market funds.

INVENTORIES (Tables)

9 Months Ended

Sep. 30, 2024

Inventory Disclosure [Abstract]

Schedule of Inventories

The Company’s inventories consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Raw materials and supplies, including spare parts(1)	$	46,138	$	42,371
Mined ore stockpiles	30,300		28,507
Work in process	24,695		15,019
Finished goods	15,566		9,285
Total current inventories	116,699		95,182
Add: Non-current portion(2)	19,825		13,350
Total inventories	$	136,524	$	108,532

(1)Includes raw materials to support activities pertaining to the Company’s rare earth metal, alloy and magnet manufacturing capabilities.

Schedule of Noncurrent Inventories

The Company’s inventories consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Raw materials and supplies, including spare parts(1)	$	46,138	$	42,371
Mined ore stockpiles	30,300		28,507
Work in process	24,695		15,019
Finished goods	15,566		9,285
Total current inventories	116,699		95,182
Add: Non-current portion(2)	19,825		13,350
Total inventories	$	136,524	$	108,532

(1)Includes raw materials to support activities pertaining to the Company’s rare earth metal, alloy and magnet manufacturing capabilities.

PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment and Depreciation and Depletion Expense

The Company’s property, plant and equipment consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Land and land improvements	$	40,254	$	27,091
Buildings and building improvements	95,236		92,203
Machinery and equipment	564,681		503,145
Assets under construction	262,994		211,848
Mineral rights	438,395		438,395
Property, plant and equipment, gross	1,401,560		1,272,682
Less: Accumulated depreciation and depletion	(171,043)		(114,628)
Property, plant and equipment, net	$	1,230,517	$	1,158,054

The Company’s depreciation and depletion expense were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Depreciation expense	$	16,018	$	13,951	$	46,012	$	28,385
Depletion expense	$	2,969	$	2,664	$	8,864	$	8,407

INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The Company’s intangible assets were as follows:


	September 30, 2024		December 31, 2023
(in thousands)
Intangible assets with indefinite lives:
Emissions allowances	$	302	$	316
Intangible assets with definite lives:
Patent and intellectual property license	8,963		8,963
Less: Accumulated amortization	(1,295)		(398)
Patent and intellectual property license, net	7,668		8,565
Intangible assets, net	$	7,970	$	8,881

Schedule of Indefinite-Lived Intangible Assets

The Company’s intangible assets were as follows:


	September 30, 2024		December 31, 2023
(in thousands)
Intangible assets with indefinite lives:
Emissions allowances	$	302	$	316
Intangible assets with definite lives:
Patent and intellectual property license	8,963		8,963
Less: Accumulated amortization	(1,295)		(398)
Patent and intellectual property license, net	7,668		8,565
Intangible assets, net	$	7,970	$	8,881

ACCRUED LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2024

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

The Company’s accrued liabilities consisted of the following:


	September 30, 2024		December 31, 2023
(in thousands)
Accrued payroll and related	$	16,396	$	14,499
Accrued construction costs	35,258		46,976
Accrued taxes	4,926		3,373
Other accrued liabilities	9,644		9,091
Accrued liabilities	$	66,224	$	73,939

DEBT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2024

Debt Disclosure [Abstract]

Schedule of Long-term Debt Obligations

The Company’s long-term debt, net, was as follows:


	September 30, 2024						December 31, 2023
(in thousands)	Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount		Principal Amount		Unamortized Debt Issuance Costs		Carrying Amount
Convertible Notes due 2026	$	210,000	$	(1,638)	$	208,362	$	690,000	$	(8,020)	$	681,980
Convertible Notes due 2030	747,500		(18,228)		729,272		—		—		—
Total long-term debt outstanding	$	957,500	$	(19,866)	$	937,634	$	690,000	$	(8,020)	$	681,980


	September 30, 2024		December 31, 2023
(in thousands)
Equipment notes
Current	$	2,074	$	2,106
Non-current	1,073		2,637
	$	3,147	$	4,743

Schedule of Interest Expense, Net

Interest expense related to the Convertible Notes was as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Coupon interest	$	5,738	$	431	$	13,389	$	1,293
Amortization of debt issuance costs	973		884		2,864		2,650
Convertible Notes interest expense	$	6,711	$	1,315	$	16,253	$	3,943

LEASES (Tables)

9 Months Ended

Sep. 30, 2024

Leases [Abstract]

Supplemental Disclosure For The Consolidated Balance Sheets Related to Operating And Finance Leases

Supplemental disclosure for the unaudited Condensed Consolidated Balance Sheets related to the Company’s operating and finance leases is as follows:


	Location on Unaudited Condensed Consolidated Balance Sheets	September 30, 2024		December 31, 2023
(in thousands)
Operating leases:
Right-of-use assets	Operating lease right-of-use assets	$	9,004	$	10,065

Operating lease liability, current	Other current liabilities	$	1,057	$	959
Operating lease liability, non-current	Operating lease liabilities	6,016		6,829
Total operating lease liabilities		$	7,073	$	7,788

Finance leases:
Right-of-use assets	Other non-current assets	$	1,002	$	591

Finance lease liability, current	Other current liabilities	$	566	$	195
Finance lease liability, non-current	Other non-current liabilities	442		388
Total finance lease liabilities		$	1,008	$	583

REVENUE RECOGNITION (Tables)

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table disaggregates the Company’s revenue from contracts with customers by type of good sold, which are transferred to customers at a point in time:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Rare earth concentrate	$	43,053	$	52,472	$	107,555	$	212,139
NdPr oxide and metal	19,179		—		34,037		—
Other revenue	695		44		1,277		101
Total revenue	$	62,927	$	52,516	$	142,869	$	212,240

STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Awards Activity

The Company’s stock-based compensation was recorded as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	$	713	$	842	$	2,789	$	2,759
Selling, general and administrative	4,532		5,193		15,070		15,603
Start-up costs	134		254		369		651
Advanced projects and development	74		9		395		28
Total stock-based compensation expense	$	5,453	$	6,298	$	18,623	$	19,041

Stock-based compensation capitalized to property, plant and equipment, net	$	491	$	367	$	597	$	1,566

FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:


	September 30, 2024
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	284,434	$	284,434	$	284,434	$	—	$	—
Short-term investments	$	582,056	$	582,056	$	582,056	$	—	$	—
Restricted cash	$	1,160	$	1,160	$	1,160	$	—	$	—
Financial liabilities:
2026 Notes	$	208,362	$	192,938	$	192,938	$	—	$	—
2030 Notes	$	729,272	$	823,812	$	823,812	$	—	$	—
Equipment notes	$	3,147	$	3,114	$	—	$	3,114	$	—


	December 31, 2023
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	263,351	$	263,351	$	263,351	$	—	$	—
Short-term investments	$	734,493	$	734,493	$	734,493	$	—	$	—
Restricted cash	$	1,637	$	1,637	$	1,637	$	—	$	—
Financial liabilities:
2026 Notes	$	681,980	$	619,496	$	619,496	$	—	$	—
Equipment notes	$	4,743	$	4,628	$	—	$	4,628	$	—

Fair Value Disclosure of Asset and Liability Not Measured at Fair Value

The carrying amounts and estimated fair values by input level of the Company’s financial instruments were as follows:


	September 30, 2024
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	284,434	$	284,434	$	284,434	$	—	$	—
Short-term investments	$	582,056	$	582,056	$	582,056	$	—	$	—
Restricted cash	$	1,160	$	1,160	$	1,160	$	—	$	—
Financial liabilities:
2026 Notes	$	208,362	$	192,938	$	192,938	$	—	$	—
2030 Notes	$	729,272	$	823,812	$	823,812	$	—	$	—
Equipment notes	$	3,147	$	3,114	$	—	$	3,114	$	—


	December 31, 2023
(in thousands)	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	263,351	$	263,351	$	263,351	$	—	$	—
Short-term investments	$	734,493	$	734,493	$	734,493	$	—	$	—
Restricted cash	$	1,637	$	1,637	$	1,637	$	—	$	—
Financial liabilities:
2026 Notes	$	681,980	$	619,496	$	619,496	$	—	$	—
Equipment notes	$	4,743	$	4,628	$	—	$	4,628	$	—

EARNINGS (LOSS) PER SHARE (Tables)

9 Months Ended

Sep. 30, 2024

Earnings Per Share [Abstract]

Schedule of weighted average number of shares


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
Weighted-average shares outstanding, basic	164,149,348	177,231,717	168,002,773	177,034,068
Assumed conversion of 2026 Notes	—	—	4,063,441	15,584,409

Assumed conversion of restricted stock	—	—	—	620,190
Assumed conversion of RSUs	—	—	—	393,995

Weighted-average shares outstanding, diluted	164,149,348	177,231,717	172,066,214	193,632,662

Schedule of potentially dilutive securities

The following table presents unweighted potentially dilutive shares that were not included in the computation of diluted earnings (loss) per share because to do so would have been antidilutive:


	For the three months ended September 30,		For the nine months ended September 30,
	2024	2023	2024	2023
2026 Notes	—	15,584,409	—	—
2030 Notes	34,380,440	—	34,380,440	—
Restricted Stock	342,601	685,202	342,601	—
RSUs	1,762,523	1,629,938	1,762,523	3,184
Total	36,485,564	17,899,549	36,485,564	3,184

Schedule of basic and diluted earnings per share

The following table presents the calculation of basic and diluted earnings (loss) per share for the Company’s common stock:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands, except share and per share data)	2024		2023		2024		2023
Calculation of basic earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Weighted-average shares outstanding, basic	164,149,348		177,231,717		168,002,773		177,034,068
Basic earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.26)	$	0.23

Calculation of diluted earnings (loss) per share:
Net income (loss)	$	(25,516)	$	(4,276)	$	(43,082)	$	40,566
Interest expense, net of tax(1):
2026 Notes(2)	—		—		770		2,977
Gain on early extinguishment of debt(1)(2)(3)	—		—		(33,563)		—
Diluted income (loss)	$	(25,516)	$	(4,276)	$	(75,875)	$	43,543
Weighted-average shares outstanding, diluted	164,149,348		177,231,717		172,066,214		193,632,662
Diluted earnings (loss) per share	$	(0.16)	$	(0.02)	$	(0.44)	$	0.22

(1)The nine months ended September 30, 2024 and 2023, were tax-effected at a rate of 27.5% and 24.5%, respectively.

(3)Pertains to the 2026 Notes, a portion of which were repurchased during the nine months ended September 30, 2024.

RELATED PARTY TRANSACTIONS (Tables)

9 Months Ended

Sep. 30, 2024

The Company’s related-party revenue and cost of sales were as follows:


	For the three months ended September 30,				For the nine months ended September 30,
(in thousands)	2024		2023		2024		2023
Revenue:
Rare earth concentrate	$	43,053	$	51,502	$	107,555	$	203,186
NdPr oxide and metal	$	5,061	$	—	$	7,306	$	—

Cost of sales (excluding depreciation, depletion and amortization)	$	38,139	$	21,829	$	78,848	$	66,817

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

9 Months Ended

Sep. 30, 2024

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental cash flow information and non-cash investing and financing activities were as follows:


	For the nine months ended September 30,
(in thousands)	2024		2023
Supplemental cash flow information:
Cash paid for interest	$	11,796	$	1,116
Cash payments related to income taxes(1)	$	—	$	23,101
Change in construction payables and accrued construction costs	$	(14,756)	$	10,952
Supplemental non-cash investing and financing activities:
Common stock issued to acquire intangible asset	$	—	$	8,963
Common stock issued in exchange for financial advisory services	$	3,737	$	—
Operating right-of-use assets obtained in exchange for lease liabilities	$	—	$	7,608

Excise tax obligation related to repurchases of common stock	$	2,037	$	—

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2024 USD ($)	Sep. 30, 2024 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments \| segment		1
Deferred revenue additions \| $	$ 50.0

SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Concentration Risk [Line Items]
Excise tax liability	$ 2.0		$ 0.0
Shenghe \| Product sales \| Customer concentration risk \| Shenghe
Concentration Risk [Line Items]
Concentration risk percentage	80.00%	90.00%

CASH, CASH EQUIVALENTS AND INVESTMENTS - Amortized Costs, Unrealized Gains and Losses, and Estimated Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Total cash and equivalents
Amortized Cost Basis	$ 284,397	$ 263,320
Unrealized Gains	37	31
Unrealized Losses	0	0
Estimated Fair Value	284,434	263,351
Short-term investments:
Amortized Cost Basis	581,632	734,332
Unrealized Gains	433	249
Unrealized Losses	(9)	(88)
Short-term investments	582,056	734,493
Amortized Cost Basis	866,029	997,652
Unrealized Gains	470	280
Unrealized Losses	(9)	(88)
Total cash, cash equivalents and short-term investments	866,490	997,844
U.S. agency securities
Short-term investments:
Amortized Cost Basis	2,240	118,370
Unrealized Gains	0	0
Unrealized Losses	(1)	(78)
Short-term investments	2,239	118,292
U.S. Treasury securities
Short-term investments:
Amortized Cost Basis	562,072	615,962
Unrealized Gains	429	249
Unrealized Losses	(8)	(10)
Short-term investments	562,493	616,201
Commercial paper
Short-term investments:
Amortized Cost Basis	17,320	0
Unrealized Gains	4	0
Unrealized Losses	0	0
Short-term investments	17,324	0
Demand deposits
Total cash and equivalents
Amortized Cost Basis	5,406	2,795
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	5,406	2,795
Total cash equivalents
Total cash and equivalents
Amortized Cost Basis	278,991	260,525
Unrealized Gains	37	31
Unrealized Losses	0	0
Estimated Fair Value	279,028	260,556
Money market funds
Total cash and equivalents
Amortized Cost Basis	118,774	61,166
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	118,774	61,166
U.S. Treasury securities
Total cash and equivalents
Amortized Cost Basis	68,669	92,113
Unrealized Gains	13	14
Unrealized Losses	0	0
Estimated Fair Value	68,682	92,127
Commercial paper
Total cash and equivalents
Amortized Cost Basis	84,626	93,447
Unrealized Gains	23	15
Unrealized Losses	0	0
Estimated Fair Value	84,649	93,462
Certificates of deposit
Total cash and equivalents
Amortized Cost Basis	6,672	13,799
Unrealized Gains	1	2
Unrealized Losses	0	0
Estimated Fair Value	6,673	13,801
Municipal securities
Total cash and equivalents
Amortized Cost Basis	250	0
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	$ 250	$ 0

CASH, CASH EQUIVALENTS AND INVESTMENTS - Debt Securities, Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 3	$ 1	$ 6	$ 506
Gross realized losses	1	0	15	139
Interest and investment income	11,759	$ 14,455	37,031	$ 41,607
Due within one year	$ 742,300		$ 742,300

CASH, CASH EQUIVALENTS AND INVESTMENTS - Schedule of Investments Classified by Contractual Maturity Date (Details) $ in Millions	Sep. 30, 2024 USD ($)
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Due within one year	$ 742.3

INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
INVENTORIES (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw materials and supplies, including spare parts	$ 46,138		$ 46,138		$ 42,371
Mined ore stockpiles	30,300		30,300		28,507
Work in process	24,695		24,695		15,019
Finished goods	15,566		15,566		9,285
Total current inventories	116,699		116,699		95,182
Add: Non-current portion	19,825		19,825		13,350
Total inventories	136,524		136,524		108,532
Noncurrent mined ore stockpiles	12,000		12,000		$ 9,100
Inventory Valuation Reserves	15,100		15,100
Change in Inventory Reserve	$ (2,700)
Lower of cost or net realizable value reserve		$ 0	$ 15,085	$ 0

PROPERTY, PLANT AND EQUIPMENT - Schedule Of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,401,560	$ 1,272,682
Less: Accumulated depreciation and depletion	(171,043)	(114,628)
Property, plant and equipment, net	1,230,517	1,158,054
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,254	27,091
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	95,236	92,203
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	564,681	503,145
Assets under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	262,994	211,848
Mineral rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 438,395	$ 438,395

PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Capitalized expenditures			$ 130,000,000.0	$ 199,900,000
Demolition costs		$ 800,000		5,500,000
Asset impairment charges	$ 0	$ 0	$ 0	$ 0

PROPERTY, PLANT AND EQUIPENT - Depreciation and Depletion Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 16,018	$ 13,951	$ 46,012	$ 28,385
Depletion expense	$ 2,969	$ 2,664	$ 8,864	$ 8,407

EQUITY METHOD INVESTMENTS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 8,962	$ 8,962	$ 9,673
Impairment charge	$ 0	$ 0
VREX HoldCo Pte. Ltd
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	49.00%	49.00%
Loss from equity method investment	$ (300)	$ (600)

INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 300	$ 100	$ 900	$ 100
Goodwill and Intangible Asset Impairment	$ 0	$ 0	$ 0	$ 0

INTANGIBLE ASSETS - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Intangible assets with indefinite lives:
Emissions allowances	$ 302	$ 316
Intangible assets with definite lives:
Patent and intellectual property license	8,963	8,963
Less: Accumulated amortization	(1,295)	(398)
Patent and intellectual property license, net	7,668	8,565
Intangible assets, net	$ 7,970	$ 8,881

ASSET RETIREMENT AND ENVIRONMENTAL OBLIGATIONS (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Unusual Risk or Uncertainty [Line Items]
Asset retirement obligation, current	$ 0.2	$ 0.2
Estimated undiscounted cash flows, to satisfy obligation	$ 52.5	50.2
Remediation term	23 years
Discount rate	2.93%
Environmental obligations, undiscounted cost	$ 26.3	26.7
Environmental obligations, current	0.5	0.5
Closure and reclamation obligations, financial assurances	$ 45.5	$ 45.4
Minimum
Unusual Risk or Uncertainty [Line Items]
Asset retirement obligations, credit-adjusted risk free rate	6.50%
Maximum
Unusual Risk or Uncertainty [Line Items]
Asset retirement obligations, credit-adjusted risk free rate	12.00%

ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued payroll and related	$ 16,396	$ 14,499
Accrued construction costs	35,258	46,976
Accrued taxes	4,926	3,373
Other accrued liabilities	9,644	9,091
Accrued liabilities	$ 66,224	$ 73,939

DEBT OBLIGATIONS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Principal Amount	$ 957,500	$ 690,000
Unamortized Debt Issuance Costs	(19,866)	(8,020)
Carrying Amount	937,634	681,980
Convertible Notes due 2026 \| Convertible Debt [Member]
Debt Instrument [Line Items]
Principal Amount	210,000	690,000
Unamortized Debt Issuance Costs	(1,638)	(8,020)
Carrying Amount	208,362	681,980
Convertible Notes due 2030 \| Convertible Debt [Member]
Debt Instrument [Line Items]
Principal Amount	747,500	0
Unamortized Debt Issuance Costs	(18,228)	0
Carrying Amount	$ 729,272	$ 0

DEBT OBLIGATIONS - Convertible Notes (Details)	1 Months Ended		3 Months Ended		9 Months Ended
DEBT OBLIGATIONS - Convertible Notes (Details)	Mar. 31, 2024 USD ($) d $ / shares	Mar. 31, 2021 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Mar. 07, 2024 USD ($)
Debt Instrument [Line Items]
Gain on early extinguishment of debt			$ 0	$ 0	$ 46,265,000	$ 0
Debt issuance costs paid in cash					16,149,000	0
Common stock issued in exchange for financial advisory services					$ 3,737,000	$ 0
Convertible Notes due 2026
Debt Instrument [Line Items]
Percentage of par value	$ 0.895
Convertible Notes due 2026 \| Convertible Debt [Member]
Debt Instrument [Line Items]
Amount borrowed		$ 690,000,000
Interest rate		0.25%
Principal amount of debt repurchased	80,000,000						$ 400,000,000
Cash paid to repurchase debt	70,600,000						$ 358,000,000
Debt instrument, convertible, conversion price (in USD per share) \| $ / shares		$ 44.28
Debt instrument, convertible, conversion ratio		0.0225861
Debt instrument, convertible, number of equity instruments (in shares) \| shares					5,999,994
Effective interest rate			0.51%		0.51%
Debt term					1 year 6 months
If-converted value in excess of principal					$ 0
Convertible Notes due 2030 \| Convertible Debt [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 747,500,000
Interest rate	3.00%
Debt instrument, convertible, conversion price (in USD per share) \| $ / shares	$ 21.74
Debt instrument, convertible, conversion ratio	0.0459939
Debt instrument, convertible, number of equity instruments (in shares) \| shares					48,132,646
Effective interest rate			3.49%		3.49%
Debt term					5 years 4 months 24 days
Gross debt issuance costs			$ 19,900,000		$ 19,900,000
Common stock issued in exchange for financial advisory services					3,700,000
Debt instrument, redemption price, percentage	100.00%
If-converted value in excess of principal					$ 102,000,000.0
Convertible Notes due 2030 \| Convertible Debt [Member] \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| d	20
Threshold consecutive trading days \| d	30
Debt instrument, convertible, threshold percentage of stock price trigger	130.00%
Debt Instrument, Convertible, Business Day Period During Which Debt Can be Converted \| d	5
Debt Instrument, Convertible, Treshold Consecutive Business Days \| d	10
Debt Instrument, Convertible, Percentage of Product Of The Last Reported Sale Price Of the Company’s Common Stock And The Conversion Rate On Each Such Trading Day	98.00%
Convertible Notes due 2030 \| Convertible Debt [Member] \| Maximum
Debt Instrument [Line Items]
Debt instrument, convertible, conversion ratio	0.0643915

DEBT OBLIGATIONS - Capped Calls (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Option Indexed To Issuers Equity Stock Price Cap		$ 31.06
Call Option
Debt Instrument [Line Items]
Payments For Capped Call Option Related To Convertible Debt	$ 65.3
Deferred tax impact of Capped Call Options	$ 16.1
Call Option \| Common Stock, par value of $0.0001 per share
Debt Instrument [Line Items]
Shares covered by Capped Call Options		34.4

DEBT OBLIGATIONS - Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 2,864	$ 2,650
Convertible Debt [Member]
Debt Instrument [Line Items]
Coupon interest	$ 5,738	$ 431	13,389	1,293
Amortization of debt issuance costs	973	884	2,864	2,650
Convertible Notes interest expense	$ 6,711	$ 1,315	$ 16,253	$ 3,943

DEBT OBLIGATIONS - Equipment Notes (Details) - Equipment notes - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Debt term	5 years
Interest rate	4.50%
Equipment notes
Current	$ 2,074	$ 2,106
Non-current	1,073	2,637
Notes payable	$ 3,147	$ 4,743

LEASES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Impairment charges, finance lease	$ 0	$ 0	$ 0	$ 0
Impairment charges, operating lease	$ 0	$ 0	$ 0	$ 0

LEASES - Supplemental Disclosure for the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Right-of-use assets
Right-of-use assets	$ 9,004	$ 10,065
Operating lease liability, current	1,057	959
Operating lease liability, non-current	6,016	6,829
Total operating lease liabilities	$ 7,073	$ 7,788
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Finance leases:
Right-of-use assets	$ 1,002	$ 591
Finance lease liability, current	566	195
Finance lease liability, non-current	442	388
Total finance lease liabilities	$ 1,008	$ 583
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other non-current assets	Other non-current assets
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other non-current liabilities	Other non-current liabilities

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
INCOME TAXES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Loss Carryforwards [Line Items]
Effective tax rate	26.80%	4.50%	27.50%	24.50%
Investment Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 58.5		$ 58.5
Income taxes receivable	$ 3.4		$ 3.4

REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 62,927	$ 52,516	$ 142,869	$ 212,240
Rare earth concentrate (including related party)
Disaggregation of Revenue [Line Items]
Total revenue	43,053	52,472	107,555	212,139
NdPr oxide and metal (including related party)
Disaggregation of Revenue [Line Items]
Total revenue	19,179	0	34,037	0
Other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 695	$ 44	$ 1,277	$ 101

REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Deferred revenue additions	$ 50,000
Deferred revenue		$ 50,000	$ 0

GOVERNMENT GRANTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Feb. 28, 2022	Nov. 30, 2020
Government Assistance [Line Items]
Reimbursements received from the government			$ 96	$ 1,050
Cost of sales (excluding depreciation, depletion and amortization) (including related party)	$ 57,266	$ 22,217	134,323	69,137
Depreciation, depletion and amortization	(19,344)	(16,751)	(55,939)	(37,076)
Technology Investment Agreement
Government Assistance [Line Items]
Technology investment agreement, stage II optimization contribution							$ 9,600
Reimbursements received from the government			100	0
HREE Production Project Agreement
Government Assistance [Line Items]
Reimbursements received from the government			0	1,100
HREE Production Project Agreement, stage II optimization contribution						$ 35,000
45 X Credit Government Grant
Government Assistance [Line Items]
Deferred government grant	2,000		2,000		$ 1,700
45 X Credit Government Grant \| UNITED STATES
Government Assistance [Line Items]
Cash payments related to income taxes(1)	19,400
45 X Credit Government Grant \| Depreciation, depletion and amortization
Government Assistance [Line Items]
Benefits recognized pertaining to the 45X Credit	(500)	0	(1,400)	0
45 X Credit Government Grant \| Cost of sales (excluding depreciation, depletion and amortization) (including related party)
Government Assistance [Line Items]
Benefits recognized pertaining to the 45X Credit	$ (1,400)	$ 0	$ (3,800)	$ 0

STOCK-BASED COMPENSATION - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended	9 Months Ended
	Mar. 07, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Aug. 30, 2024	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share repurchase program, authorized, amount					$ 600,000	$ 300,000
Repurchases of common stock	$ 191,600	$ 24,300	$ 225,068	$ 0
Repurchases of common stock (in shares)	12.3	2.2	15.2
Average cost per share acquired	$ 15.53
Share repurchase program, remaining authorized, amount		$ 375,000	$ 375,000
Stock Repurchase Program Increase In Authorized Amount					$ 300,000

STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period		3 years
Call Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments For Capped Call Option Related To Convertible Debt	$ 65.3
Deferred tax impact of Capped Call Options	$ 16.1
Call Option \| Common Stock, par value of $0.0001 per share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares covered by Capped Call Options		34,400,000
2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants (in shares)		5,332,696
2024 Performance Share Plan \| Market-Based PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		177,766
Vesting period		3 years
2024 Performance Share Plan \| Market-Based PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage of the awards granted (as a percent)		0.00%
2024 Performance Share Plan \| Market-Based PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage of the awards granted (as a percent)		200.00%

STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation and Related Income Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 5,453	$ 6,298	$ 18,623	$ 19,041
Stock-based compensation capitalized to property, plant and equipment, net	491	367	597	1,566
Cost of sales (excluding depreciation, depletion and amortization) (including related party)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	713	842	2,789	2,759
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	4,532	5,193	15,070	15,603
Start-up costs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	134	254	369	651
Advanced Projects and Development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 74	$ 9	$ 395	$ 28

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets:
Cash and cash equivalents	$ 284,434	$ 263,351
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	284,434	263,351
Short-term investments	582,056	734,493
Restricted cash	1,160	1,637
Fair Value, Inputs, Level 1 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2026
Financial liabilities:
Debt fair value	192,938	619,496
Fair Value, Inputs, Level 1 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2030
Financial liabilities:
Debt fair value	823,812
Fair Value, Inputs, Level 1 [Member] \| Equipment notes
Financial liabilities:
Debt fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Restricted cash	0	0
Fair Value, Inputs, Level 2 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2026
Financial liabilities:
Debt fair value	0	0
Fair Value, Inputs, Level 2 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2030
Financial liabilities:
Debt fair value	0
Fair Value, Inputs, Level 2 [Member] \| Equipment notes
Financial liabilities:
Debt fair value	3,114	4,628
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Restricted cash	0	0
Fair Value, Inputs, Level 3 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2026
Financial liabilities:
Debt fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| Convertible Debt [Member] \| Convertible Notes due 2030
Financial liabilities:
Debt fair value	0
Fair Value, Inputs, Level 3 [Member] \| Equipment notes
Financial liabilities:
Debt fair value	0	0
Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	284,434	263,351
Short-term investments	582,056	734,493
Restricted cash	1,160	1,637
Reported Value Measurement [Member] \| Convertible Debt [Member] \| Convertible Notes due 2026
Financial liabilities:
Debt fair value	208,362	681,980
Reported Value Measurement [Member] \| Convertible Debt [Member] \| Convertible Notes due 2030
Financial liabilities:
Debt fair value	729,272
Reported Value Measurement [Member] \| Equipment notes
Financial liabilities:
Debt fair value	3,147	4,743
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	284,434	263,351
Short-term investments	582,056	734,493
Restricted cash	1,160	1,637
Estimate of Fair Value Measurement [Member] \| Convertible Debt [Member] \| Convertible Notes due 2026
Financial liabilities:
Debt fair value	192,938	619,496
Estimate of Fair Value Measurement [Member] \| Convertible Debt [Member] \| Convertible Notes due 2030
Financial liabilities:
Debt fair value	823,812
Estimate of Fair Value Measurement [Member] \| Equipment notes
Financial liabilities:
Debt fair value	$ 3,114	$ 4,628

EARNINGS (LOSS) PER SHARE - Schedule of Weighted Average Number of Shares (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Class of Warrant or Right [Line Items]
Weighted-average shares outstanding, basic (in shares)	164,149,348	177,231,717	168,002,773	177,034,068
Weighted-average shares outstanding, diluted (in shares)	164,149,348	177,231,717	172,066,214	193,632,662
Convertible Notes due 2026
Class of Warrant or Right [Line Items]
Assumed conversion of Convertible Notes (in shares)	0	0	4,063,441	15,584,409
Restricted Stock
Class of Warrant or Right [Line Items]
Assumed conversion of restricted stock awards (in shares)	0	0	0	620,190
RSUs
Class of Warrant or Right [Line Items]
Assumed conversion of restricted stock awards (in shares)	0	0	0	393,995

EARNINGS (LOSS) PER SHARE - Schedule of Unweighted Potentially Dilutive Shares (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Class of Warrant or Right [Line Items]
Antidilutive securities excluding from computation (in shares)	36,485,564	17,899,549	36,485,564	3,184
Convertible Notes due 2030 \| Convertible Notes due 2030
Class of Warrant or Right [Line Items]
Antidilutive securities excluding from computation (in shares)	34,380,440	0	34,380,440	0
Restricted Stock
Class of Warrant or Right [Line Items]
Antidilutive securities excluding from computation (in shares)	342,601	685,202	342,601	0
RSUs
Class of Warrant or Right [Line Items]
Antidilutive securities excluding from computation (in shares)	1,762,523	1,629,938	1,762,523	3,184
Convertible Notes due 2026 \| Convertible Notes due 2026
Class of Warrant or Right [Line Items]
Antidilutive securities excluding from computation (in shares)	0	15,584,409	0	0

EARNINGS (LOSS) PER SHARE - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Calculation of basic earnings (loss) per share:
Net income (loss)	$ (25,516)	$ (4,276)	$ (43,082)	$ 40,566
Weighted-average shares outstanding, basic (in shares)	164,149,348	177,231,717	168,002,773	177,034,068
Basic earnings (loss) per share (in USD per share)	$ (0.16)	$ (0.02)	$ (0.26)	$ 0.23
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Extinguishment of Debt, Gain (Loss), Net of Tax	$ 0	$ 0	$ (33,563)	$ 0
Diluted income (loss)	$ (25,516)	$ (4,276)	$ (75,875)	$ 43,543
Weighted-average shares outstanding, diluted (in shares)	164,149,348	177,231,717	172,066,214	193,632,662
Diluted earnings (loss) per share (in USD per share)	$ (0.16)	$ (0.02)	$ (0.44)	$ 0.22
Effective tax rate	26.80%	4.50%	27.50%	24.50%
Convertible Notes due 2026
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Interest expense on convertible debt, net of tax	$ 0	$ 0	$ 770	$ 2,977

RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Jan. 31, 2024	Oct. 31, 2023	Mar. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Purchases from related party				$ 1,800	$ 5,800	$ 4,100	$ 7,600
Accounts receivable				14,549		14,549		$ 10,029
Related party
Related Party Transaction [Line Items]
Accounts receivable				$ 8,200		$ 8,200		$ 9,200
Offtake Agreement
Related Party Transaction [Line Items]
Initial term			2 years
Extension period			1 year
VREX Tolling Agreement
Related Party Transaction [Line Items]
Initial term		3 years
Extension period		3 years
2024 Offtake Agreement
Related Party Transaction [Line Items]
Initial term	2 years
Extension period	1 year

RELATED PARTY TRANSACTIONS - Related Party Revenue and Cost of Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Total revenue	$ 62,927	$ 52,516	$ 142,869	$ 212,240
Cost of sales (excluding depreciation, depletion and amortization)	57,266	22,217	134,323	69,137
Related party
Related Party Transaction [Line Items]
Cost of sales (excluding depreciation, depletion and amortization)	38,139	21,829	78,848	66,817
Rare earth concentrate
Related Party Transaction [Line Items]
Total revenue	43,053	52,472	107,555	212,139
Rare earth concentrate \| Related party
Related Party Transaction [Line Items]
Total revenue	43,053	51,502	107,555	203,186
Other rare earth products
Related Party Transaction [Line Items]
Total revenue	695	44	1,277	101
NdPr oxide and metal (including related party)
Related Party Transaction [Line Items]
Total revenue	19,179	0	34,037	0
NdPr oxide and metal (including related party) \| Related party
Related Party Transaction [Line Items]
Total revenue	$ 5,061	$ 0	$ 7,306	$ 0

SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Supplemental cash flow information:
Cash paid for interest	$ 11,796	$ 1,116
Cash payments related to income taxes(1)	0	23,101
Change in construction payables and accrued construction costs	(14,756)	10,952
Supplemental non-cash investing and financing activities:
Common stock issued to acquire intangible asset	0	8,963
Common stock issued in exchange for financial advisory services	3,737	0
Operating right-of-use assets obtained in exchange for lease liabilities	0	7,608
Excise tax obligation related to repurchases of common stock	$ 2,037	$ 0

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