As filed with the Securities and Exchange Commission on August 11, 2023

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

MiNK Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

MiNK Therapeutics, Inc. 2021 Equity Incentive Plan

MiNK Therapeutics, Inc. 2021 Employee Stock Purchase Plan

(Full titles of the plans)

Jennifer S. Buell, Ph.D.

President, Chief Executive Officer and Director

MiNK Therapeutics, Inc.

149 Fifth Avenue, Suite 500

New York, NY 10010

(Name and address of agent for service)

(212) 994-8250

(Telephone number, including area code, of agent for service)

Please send a copy of all communications to:

Zachary Blume

Ropes & Gray LLP

Prudential Tower

800 Boylston Street

Boston, MA 02199-3600

617-951-7000

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.

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 7(a)(2)(B) of the Securities Act.  ☐

Explanatory Note

This Registration Statement on Form S-8, relating to the 2021 Equity Incentive Plan (the “2021 EIP”) of MiNK Therapeutics, Inc. (the “Registrant”) and the 2021 Employee Stock Purchase Plan of the Registrant (the “ESPP”), is being filed for the purpose of registering additional securities of the same class as other securities for which a Registration Statement on Form S-8 has previously been filed and is effective. Accordingly, pursuant to General Instruction E to Form S-8, this Registration Statement incorporates by reference the contents of the Registration Statement on Form S-8, File No. 333-266170 , filed with the Securities and Exchange Commission (the “SEC”) on July 15, 2022 by the Registrant, relating to the 2021 EIP and the ESPP.

Item 8. Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, NY, on this 11th day of August, 2023.

POWER OF ATTORNEY

Each person whose signature appears below constitutes and appoints Jennifer S. Buell, Ph.D. and Christine M. Klaskin, and each of them singly, his or her true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement on Form S-8 to be filed by MiNK Therapeutics, Inc. and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents full power and authority to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, and each of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

* * * *

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated:

Exhibit 5.1

		ROPES & GRAY LLP PRUDENTIAL TOWER 800 BOYLSTON STREET BOSTON, MA 02199-3600 WWW.ROPESGRAY.COM

August 11, 2023

MiNK Therapeutics Inc.

49 Fifth Avenue, Suite 500

New York, NY 10010

Ladies and Gentlemen:

This opinion letter is furnished to you in connection with the registration statement on Form S-8 (the “Registration Statement”), filed by MiNK Therapeutics Inc., a Delaware corporation (the “Company”), on the date hereof, with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), for the registration of 1,692,817 shares of Common Stock, $0.00001 par value per share, of the Company (the “Shares”). The Shares are issuable under the Company’s 2021 Equity Incentive Plan and the Company’s 2021 Employee Stock Purchase Plan (each, a “Plan,” and collectively, the “Plans”).

We are familiar with the actions taken by the Company in connection with the adoption of the Plans. We have examined such certificates, documents and records and have made such investigation of fact and such examination of law as we have deemed appropriate in order to enable us to render the opinions set forth herein. In conducting such investigation, we have relied, without independent verification, upon certificates of officers of the Company, public officials and other appropriate persons.

The opinions expressed below are limited to the Delaware General Corporation Law.

Based upon and subject to the foregoing, we are of the opinion that the Shares have been duly authorized and, when the Shares have been issued and sold in accordance with the terms of the applicable Plan, the Shares will be validly issued, fully paid and nonassessable.

We hereby consent to the filing of this opinion letter as an exhibit to the Registration Statement. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations thereunder.

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the use of our report dated March 24, 2023, with respect to the consolidated financial statements of MiNK Therapeutics, Inc., incorporated herein by reference.

Boston, Massachusetts

August 11, 2023

Exhibit 107

Calculation of Filing Fee Tables

Form S-8

(Form Type)

MiNK Therapeutics, Inc.

(Exact Name of Registrant as Specified in its Charter)

Table 1: Newly Registered Securities