FATH Fathom Digital Manufacturing Corporation

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 2)

Fathom Digital Manufacturing Corporation

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Title of Class of Securities)

31189Y 103

(CUSIP Number)

John R. May

c/o CORE Industrial Partners Fund I GP, LLC

110 N Wacker Drive, Suite 2200

Chicago, IL 60606

(312) 566-4880

Copy to:

Robert E. Goedert, P.C.

Kirkland & Ellis LLP

300 North LaSalle Street

Chicago, IL 60654

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 22, 2023

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act.

CUSIP No. 31189Y 103

CUSIP No. 31189Y 103

CUSIP No. 31189Y 103

CUSIP No. 31189Y 103

END OF COVER PAGES

This Amendment No. 2 amends the statement on Schedule 13D filed with the U.S. Securities and Exchange Commission (the “SEC”) on January 3, 2021, as amended by Amendment No. 1 filed with the SEC on April 10, 2023 (as amended, the “Existing Schedule”) relating to the shares of Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), of Fathom Digital Manufacturing Corporation, a Delaware Corporation (the “Company” or the “Issuer”). Information reported and defined terms used in the Existing Schedule, as amended to the date hereof (this “Statement” or “Schedule 13D”), remain in effect except to the extent that they are amended or superseded by information or defined terms contained in this Amendment.

Item 3 of this Statement is hereby supplemented to include the following information:

The Reporting Persons have not obtained any financing commitments or agreed to any financing terms regarding the transactions contemplated by the Proposal (as defined below). The Reporting Persons are also open to considering the possibility of certain of the Issuer’s significant stockholders rolling over a portion of their current investment in the Issuer and may engage with such stockholders regarding this possibility. Any third-party financing for the transactions contemplated by the Proposal remains subject to negotiation of definitive documentation, and the Reporting Persons can provide no assurances that they will be able to negotiate definitive agreements or obtain financing on terms acceptable to them.

Item 4 of this Statement is hereby amended and supplemented to include the following information:

The Proposal

On November 22, 2023, CORE Industrial Partners, LLC (“CORE”), on behalf of itself and its affiliated investment vehicles, determined to pursue a transaction to take the Issuer private and submit a non-binding proposal with respect to such a transaction to a special committee of the board of directors of the Issuer (the “Board”) comprised of non-management directors that are independent of the CORE Funds (as defined below), the Reporting Persons and their respective affiliates (the “Special Committee”). Accordingly, on November 22, 2023, CORE, on behalf of itself and its affiliated investment vehicles, delivered to the Special Committee a letter (the “Proposal Letter”) setting forth a non-binding proposal to acquire all of the outstanding shares of capital stock of the Issuer that are not owned by the CORE Funds for cash consideration of $4.50 per share (the “Proposal”).

CORE expects that the Special Committee will consider the Proposal in consultation with independent financial and legal advisors and make a recommendation to the Board with respect to the transaction contemplated by the Proposal. The CORE Funds expect any transaction to be subject to the express approval and affirmative recommendation of the Special Committee.

The Proposal Letter provides that it does not create any legal obligations and that no such obligations will arise unless and until definitive transaction documentation with the Issuer has been executed and delivered. No binding obligation on the part of the Reporting Persons or any of their affiliates will arise with respect to the filing of this Statement.

While the Proposal remains under consideration by the Special Committee, the Reporting Persons and their affiliates expect to respond to inquiries from, and negotiate the terms of the Proposal with, the Special Committee and its representatives. The Reporting Persons do not intend to provide additional disclosures regarding the Proposal until a definitive agreement has been reached, or unless disclosure is otherwise required under applicable U.S. securities laws. The Reporting Persons and their affiliates may participate in any process regarding the Issuer and/or engage in other activities, discussions and/or negotiations regarding any courses of action with respect to the Issuer, including, without limitation, submitting an indication of interest, letter of intent, term sheet, offer letter or other similar expression of interest in connection therewith, including any revisions to the Proposal; engaging advisors;

communicating with the Issuer, its subsidiaries and other third parties (including, without limitation, various advisors, industry analysts, investment and financing professionals and financing sources) and any potential co-investors; taking actions regarding prospective debt and/or equity financing for any such course of action, including, without limitation, exchanging information, negotiating terms and entering into commitment letters and related agreements and/or any other similar agreements; and preparing, revising and negotiating agreements with the Issuer.

The Proposal may result in one or more of the transactions, events or actions specified in clauses (a) through (j) of Item 4 of this Statement, including, without limitation, an acquisition of additional securities of the Issuer, an extraordinary corporate transaction (such as a merger) involving the Issuer, delisting of the Class A Common Stock from the New York Stock Exchange and other material changes in the Issuer’s business or corporate structure.

No assurances can be given that a definitive agreement will be reached or that the transaction contemplated by the Proposal will be consummated. CORE reserves the right to modify or withdraw the Proposal at any time and to formulate other plans or make other proposals which could result in one or more of the transactions, events or actions specified in clauses (a) through (j) of Item 4 of this Statement, and to modify or withdraw any such plan or proposal at any time. In the event the transaction contemplated by the Proposal is not consummated, the Reporting Persons and their affiliates will continue to regularly review and assess their investment in the Issuer and, depending on market conditions and other factors, may determine, from time to time, to engage in any of the events set forth in clauses (a) through (j) of Item 4 of this Statement.

The foregoing summary of the Proposal Letter does not purport to be complete and is qualified in its entirety by reference to the Proposal Letter, a copy of which is attached to this Statement as Exhibit 8 and incorporated herein by reference.

Item 5 of this Statement is hereby amended and restated as follows:

The information contained on the cover pages to this Schedule 13D is incorporated herein by reference.

Item 7 of this Statement is hereby amended and restated to add the following exhibit:

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: November 24, 2023

Exhibit 8

[Letterhead of CORE Industrial Partners]

November 22, 2023

Special Committee of the Board of Directors

Fathom Digital Manufacturing Corporation

1050 Walnut Ridge Drive

Hartland, Wisconsin 53029

Dear Members of the Special Committee of the Board of Directors:

CORE Industrial Partners, LLC (“CORE”, “we”, “our” or “us”), on behalf of itself and its affiliated investment vehicles (the “CORE Funds”), is pleased to submit this non-binding proposal pursuant to which an existing or newly formed entity on behalf of the CORE Funds would acquire for cash all of the outstanding shares of capital stock of Fathom Digital Manufacturing Corporation (the “Company”) not currently owned by the CORE Funds.

As you are aware, we have been investors in the Company or its predecessors since 2018 and we have a deep understanding and appreciation of the Company’s business as well as the opportunities and challenges facing the Company. As of the date hereof, the CORE Funds currently own shares of Class A Common Stock and Class B Common Stock representing approximately 63% of the total voting power of the Company (based on the Company’s latest Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission (the “SEC”) on November 14, 2023).

Proposal

We are pleased to offer a purchase price of $4.50 per share in cash per share of Class A Common Stock (the “Proposal”). The Proposal is based on 2,386,077 shares of Class A Common Stock outstanding and 158,485 shares of Class B Common Stock outstanding and not owned by the CORE Funds (in each case, excluding outstanding warrants, earnout shares or other contingent equity interests).

The proposed consideration represents:

This Proposal offers the Company’s stockholders a compelling combination of value, speed and certainty, and an opportunity for near-term liquidity. The Company’s stockholders would receive an immediate and certain premium value, and de-risks their investments in a volatile and uncertain market. Our Proposal also facilitates focus on serving the Company’s customers and ensuring its long-term success, including via significant additional investment, without the challenges and limitations that come with operating as a public company.

While we have strong conviction in our ability to move expeditiously toward signing, our Proposal remains subject to the negotiation and execution of mutually acceptable definitive agreements. Furthermore, we would expect the transaction to be subject to the express approval and recommendation of the Special Committee, and that the fully empowered Special Committee will have retained independent financial and legal advisors to assist in its evaluation of the Proposal and the negotiation of definitive documentation.

Approvals

This Proposal has been approved by the investment committee of the CORE Funds, which has expressly empowered us to make this Proposal as an acquirer of the Company’s capital stock. We wish to emphasize that the CORE Funds are only interested in acquiring the shares of the Company that we do not own, and accordingly, would not expect, in our capacity as a stockholder of the Company, to vote in favor of any alternative sale, merger or other corporate transaction involving the Company nor divest or sell any portion of our ownership interest.

Subject to final approval of our investment committee, the CORE Funds have obtained all required internal approvals for the transaction. No additional approvals will be required to consummate the transaction.

Structure and Closing Conditions

We expect that the transaction would be structured as a merger and do not expect the transaction to be subject to a financing condition. We expect the Proposal to be fully financed using a combination of new cash equity and rollover equity financing and we are open to considering the possibility of certain of the Company’s other significant stockholders rolling over all or a portion of their current investment. The transaction will be subject to customary closing conditions, including successfully obtaining all required stockholder and regulatory approvals.

Advisors

We have retained Kirkland & Ellis LLP as our legal advisor with respect to the transaction. Our advisors are prepared to dedicate such resources as may be necessary to complete negotiations, execute definitive agreements and consummate a transaction as promptly as practicable.

Non-Binding Effect

This Proposal is a non-binding expression of interest and is not intended, and shall not be construed, to constitute an offer subject to binding acceptance or that could result in a binding obligation of the Company or the CORE Funds. We reserve the right to withdraw or modify the Proposal at any time and no legal obligation to consummate the Proposal or any other transaction shall arise unless and until the execution of a definitive agreement between the CORE Funds (and/or a designated affiliate) and the Company.

Disclosures

In accordance with applicable securities laws, the CORE Funds expect to make appropriate amendments to the CORE Funds’ filing with the SEC on Schedule 13D, including attaching this letter as an exhibit thereto.

We look forward to receiving the Special Committee’s response to this Proposal and moving expeditiously towards definitive agreements. Should the Special Committee or its advisors have any questions or comments regarding the Proposal, please do not hesitate to contact us or our counsel at Kirkland & Ellis LLP.

Sincerely,

CORE Industrial Partners, LLC