As filed with the Securities and Exchange Commission on March 8, 2023

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

TSCAN THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

TSCAN THERAPEUTICS, INC. 2021 EQUITY INCENTIVE PLAN

TSCAN THERAPEUTICS, INC. 2021 EMPLOYEE STOCK PURCHASE PLAN

(Full title of the plan)

David Southwell

Chief Executive Officer

TScan Therapeutics, Inc.

830 Winter Street

Waltham, Massachusetts 02451

(Name and address of agent for service)

(857) 399-9500

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

Copies to:

William D. Collins, Esq.

Goodwin Procter LLP

100 Northern Avenue

Boston, Massachusetts 02210

(617) 570-1000

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 registers (i) 969,038 additional shares of the Registrant’s common stock, $0.0001 par value per share (“Common Stock”), under the TScan Therapeutics, Inc. 2021 Equity Incentive Plan (the “2021 Plan”) and (ii) 242,259 additional shares of Common Stock under the TScan Therapeutics, Inc. 2021 Employee Stock Purchase Plan (the “2021 ESPP”). The number of shares of Common Stock reserved and available for issuance under the 2021 Plan is subject to an automatic annual increase on each January 1, beginning in 2022, by an amount equal to four percent of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31 or such lesser number of shares of Common Stock as determined by the Administrator (as defined in the 2021 Plan). Accordingly, on January 1, 2023, the number of shares of Common Stock reserved and available for issuance under the 2021 Plan increased by 969,038. The additional shares are of the same class as other securities relating to the 2021 Plan for which the Registrant’s registration statement filed on Form S-8 (Registration No.  333-257941) on July 16, 2021 and registration statement filed on Form S-8 (Registration No. 333-263380), filed on March 9, 2022, are effective. The number of shares of Common Stock reserved and available for issuance under the 2021 ESPP is subject to an automatic annual increase on each January 1, beginning in 2022, by an amount equal to the least of (i) one percent of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31 or (ii) such number of shares of Common Stock as determined by the Administrator (as defined in the 2021 ESPP). Accordingly, on January 1, 2023, the number of shares of Common Stock reserved and available for issuance under the 2021 ESPP increased by 242,259. The additional shares are of the same class as other securities relating to the 2021 ESPP for which the Registrant’s registration statement filed on Form S-8 (Registration No. 333-257941) on July  16, 2021 and registration statement filed on Form S-8 (Registration No.  333-263380), filed on March  9, 2022, are effective. The information contained in the Registrant’s registration statements on Form S-8 (Registration No. 333-257941 and No. 333-263380) is hereby incorporated by reference pursuant to General Instruction E.

Part II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 8. Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, 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 Waltham, Commonwealth of Massachusetts, on March 8, 2023.

POWER OF ATTORNEY AND SIGNATURES

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints David Southwell and Brian Silver, and each of them, as such person’s true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution in each of them, for such person in such person’s, place and stead, in any and all capacities, to sign for us and in our names in the capacities indicated below the Registration Statement on Form S-8 of TScan Therapeutics, Inc., and any or all amendments (including post-effective amendments), 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, and each of them, full power and authority to do and perform each and every act and thing requisite or necessary to be done in connection therewith and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or substitutes of any of them, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement on Form S-8 has been signed by the following persons in the capacities and on the dates indicated.

Exhibit 5.1

		Goodwin Procter LLP The New York Times Building 620 Eighth Avenue New York, NY 10018   goodwinlaw.com +1 212 813 8800

March 8, 2023

TScan Therapeutics, Inc.

830 Winter Street

Waltham, Massachusetts 02451

Re:    Securities Being Registered under Registration Statement on Form S-8

We have acted as counsel to you in connection with your filing of a Registration Statement on Form S-8 (the “Registration Statement”) pursuant to the Securities Act of 1933, as amended (the “Securities Act”), on or about the date hereof relating to an aggregate of 1,211,297 shares (the “Shares”) of Common Stock, $0.0001 par value per share (“Common Stock”), of TScan Therapeutics, Inc., a Delaware corporation (the “Company”), that may be issued pursuant to the Company’s 2021 Equity Incentive Plan and 2021 Employee Stock Purchase Plan (collectively, the “Plans”).

We have reviewed such documents and made such examination of law as we have deemed appropriate to give the opinions set forth below. We have relied, without independent verification, on certificates of public officials and, as to matters of fact material to the opinion set forth below, on certificates of officers of the Company.

The opinion set forth below is limited to the Delaware General Corporation Law.

For purposes of the opinion set forth below, we have assumed that no event occurs that causes the number of authorized shares of Common Stock available for issuance by the Company to be less than the number of then unissued Shares.

Based on the foregoing, we are of the opinion that the Shares have been duly authorized and, upon issuance and delivery against payment therefor in accordance with the terms of the Plans, will be validly issued, fully paid and nonassessable.

This opinion letter and the opinion it contains shall be interpreted in accordance with the Core Opinion Principles as published in 74 Business Lawyer 815 (Summer 2019).

We hereby consent to the inclusion of this opinion as Exhibit 5.1 to the Registration Statement. In giving our consent, we do not 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.

TScan Therapeutics, Inc.

March 8, 2023

Page 2

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 8, 2023, relating to the financial statements of TScan Therapeutics, Inc. appearing in the Annual Report on Form 10-K of TScan Therapeutics, Inc. for the year ended December 31, 2022.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

March 8, 2023

Exhibit 107.1

Calculation of Filing Fee Tables

Form S-8

(Form Type)

TScan Therapeutics, Inc.

(Exact Name of Registrant as Specified in its Charter)

Table 1: Newly Registered Securities