As filed with the Securities and Exchange Commission on June 2, 2026

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Gentherm Incorporated

(Exact name of registrant as specified in its charter)

GENTHERM INCORPORATED

2023 EQUITY INCENTIVE PLAN

(Full title of the plan)

William Presley

President and Chief Executive Officer

Gentherm Incorporated

28875 Cabot Drive

Novi, MI 48377

(248) 504-0500

(Name and address and telephone number, including area code, of agent for service)

Copies to:

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

On May 14, 2026, at the 2026 Annual Meeting of Shareholders of Gentherm Incorporated (the “Registrant”), the Registrant’s shareholders approved an amendment to the Gentherm Incorporated 2023 Equity Incentive Plan (the “2023 Plan”) to increase by 1,700,000 the maximum number of shares of the Registrant’s common stock, no par value (the “Common Stock”) that may be issued pursuant to awards granted under the 2023 Plan, which amendment the Registrant’s Board of Directors (the “Board”) had previously approved, subject to such shareholder approval. The Registrant has prepared this Registration Statement on Form S-8 (the “Registration Statement”) in accordance with the requirements the Securities Act of 1933, as amended (the “Securities Act”), to register the issuance of 1,700,000 shares of Common Stock, which are reserved for issuance to eligible participants upon the vesting or exercise of awards granted under the 2023 Plan, as amended. The Common Stock being registered hereunder is in addition to the 3,730,000 shares of Common Stock registered on the Registrant’s Registration Statement on Form S-8 filed with the Securities and Exchange Commission (the “Commission”) on May 18, 2023 (Commission File No. 333-272056) (the “Prior Registration Statement”).

This Registration Statement relates to securities of the same class as that to which the Prior Registration Statement relates, and is submitted in accordance with General Instruction E to Form S-8 regarding the registration of additional securities. Pursuant to such instruction, the contents of the Prior Registration Statement are incorporated herein by reference and made part of this Registration Statement, except as amended hereby.

PART I

INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

The information specified in Part I of Form S-8 is omitted from this Registration Statement in accordance with the provisions of Rule 428 under the Securities Act and the introductory note to Part I of Form S-8. The documents containing the information specified in Part I of Form S-8 will be delivered to the participants in the plan covered by this Registration Statement as specified by Rule 428(b)(1) under the Securities Act.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Pursuant to General Instruction E to Form S-8, the content of the Prior Registration Statement is incorporated herein by reference.

The following documents filed with the Commission by the Registrant also are hereby incorporated herein by reference:

In addition, all documents the Registrant subsequently files pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the filing of this Registration Statement, and prior to the filing of a post-effective amendment that indicates that all securities offered hereby have been sold or which deregisters all securities covered hereby then remaining unsold, are incorporated herein by reference and are a part hereof from the date of filing of such documents.

Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein, or in any subsequently filed document, which also is or is deemed to be incorporated by reference herein, modifies or supersedes such prior statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute part of this Registration Statement.

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 Novi, State of Michigan, on June 2, 2026

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints William Presley, Jonathan Douyard and Wayne Kauffman as 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 (i) act on, sign and file with the Commission any and all amendments (including post-effective amendments) to this Registration Statement together with all schedules and exhibits thereto, (ii) act on, sign and file such certificates, instruments, agreements and other documents as may be necessary or appropriate in connection therewith, (iii) act on and file any supplement to any prospectus included in this Registration Statement or any such amendment, and (iv) take any and all actions which may be necessary or appropriate in connection therewith, granting unto such agents, proxies and attorneys-in-fact, and each of them, full power and authority to do and perform each and every act and thing necessary or appropriate to be done, as fully for all intents and purposes as he might or could do in person, hereby approving, ratifying and confirming all that such agents, proxies and attorneys-in-fact or any of their substitutes may lawfully do or cause to be done by virtue thereof.

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

[SIGNATURE PAGE TO S-8 REGISTRATION STATEMENT]

Exhibit 5

June 2, 2026

Gentherm Incorporated

28875 Cabot Drive

Novi, MI 48377

Ladies and Gentlemen:

We have acted as counsel to Gentherm Incorporated, a Michigan corporation (the “Company”), in connection with the preparation and filing with the Securities and Exchange Commission (the “Commission”) of a Registration Statement on Form S-8 (the “Registration Statement”) for the registration under the Securities Act of 1933, as amended (the “Securities Act”), of a maximum of 1,700,000 shares (the “Shares”) of the Company’s common stock, no par value (the “Common Stock”), to be issued by the Company pursuant to awards under the Gentherm Incorporated 2023 Equity Incentive Plan (as amended from time to time, the “Plan”).

We do not express any opinion herein concerning any law other than the Michigan Business Corporation Act.

In rendering this opinion, we have assumed the genuineness of all signatures on all documents examined by us, the due authority of the parties signing such documents, the authenticity of all documents submitted to us as originals, the conformity to authentic originals of all documents submitted to us as copies and that the offer and sale of the Shares complies in all respects with the terms, conditions and restrictions set forth in the Registration Statement and the Plan. The Company has represented to us and we have also assumed that the Company has reserved from its duly authorized capital stock a sufficient number of shares of Common Stock, including the Shares, for issuance under the Plan and will keep such reserve available at all times to enable the Company to issue and deliver the Shares upon the settlement of awards under the Plan. We have also assumed without independent investigation that there are no agreements or understandings between or among the Company and any participants in the Plan that would expand, modify or otherwise affect the terms of the Plan or the respective rights or obligations of the participants thereunder.

Based upon, subject to and limited by the foregoing, and based upon our examination of such documents and other matters as we deem relevant, we are of the opinion that the Shares to be issued by the Company under the Plan pursuant to the Registration Statement are duly authorized and, when issued and sold by the Company in accordance with the Plan and the awards thereunder, the Registration Statement and the related prospectus, will be validly issued, fully paid and non-assessable.

This opinion letter speaks only as of its date. We do not undertake any obligation to advise you or any other party of changes of law or fact that occur after the date of this opinion letter – even though the change may affect the legal analysis or legal conclusion in this opinion letter.

We hereby consent to the filing of this opinion with the Commission as Exhibit 5 to the Registration Statement. In giving such consent, we do not admit that we are within the category of persons whose consent is required by Section 7 of the Securities Act or the rules and regulations promulgated thereunder by the Commission.

c: MKB/GDP/SEME/JPK

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Gentherm Incorporated 2023 Equity Incentive Plan of Gentherm Incorporated of our reports dated February 19, 2026, with respect to the consolidated financial statements of Gentherm Incorporated and the effectiveness of internal control over financial reporting of Gentherm Incorporated included in its Annual Report (Form 10-K) for the year ended December 31, 2025, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Detroit, Michigan

June 2, 2026