# EDGAR Filing Document

**Accession Number:** 0000903129
**File Stem:** 0001140361-26-014268
**Filing Date:** 2026-4
**Character Count:** 5033
**Document Hash:** 2b4f2746e1bf4692b3cfc81d90278d54
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-014268.hdr.sgml**: 20260410

**ACCESSION NUMBER**: 0001140361-26-014268

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260410

**DATE AS OF CHANGE**: 20260410

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Gentherm Inc
- **CENTRAL INDEX KEY:** 0000903129
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTOR VEHICLE PARTS & ACCESSORIES [3714]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 954318554
- **STATE OF INCORPORATION:** MI
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-21810
- **FILM NUMBER:** 26855275

**BUSINESS ADDRESS:**
- **STREET 1:** 28875 CABOT DRIVE
- **CITY:** NOVI
- **STATE:** MI
- **ZIP:** 48377
- **BUSINESS PHONE:** 248-504-0500

**MAIL ADDRESS:**
- **STREET 1:** 28875 CABOT DRIVE
- **CITY:** NOVI
- **STATE:** MI
- **ZIP:** 48377

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GENTHERM Inc
- **DATE OF NAME CHANGE:** 20120906

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AMERIGON INC
- **DATE OF NAME CHANGE:** 19930503

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934

#### (Amendment No.)

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

---

| |
|:---|
| **Gentherm Incorporated** |
| (Name of registrant as Specified In Its Charter) |
| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |

---

Payment of Filing Fee (Check all boxes that apply):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

------

PROXY SUPPLEMENT

Gentherm Incorporated (the "Company") is providing this supplement (the "Supplement") to its definitive proxy statement (the "Proxy Statement") filed on April 1, 2026 with the Securities and Exchange Commission in connection with the Company's 2026 Annual Meeting of Shareholders to be held on May 14, 2026 at 8:30 a.m. Eastern Daylight Time, and any postponement or adjournment thereof (the "annual meeting"). Capitalized terms not defined herein have the meaning set forth in the Proxy Statement.

Except to the extent described in this Supplement, none of the items or information contained in the Proxy Statement is affected by this Supplement. This Supplement does not provide all of the information that is important to your voting decisions at the annual meeting. We encourage you to carefully read in their entirety the Proxy Statement, this Supplement and the other proxy materials previously made available to shareholders in connection with the annual meeting, all of which contain important information.

This Supplement is being filed solely to clarify the description of the effect of abstentions on Proposal 4 (Approval of the Amendment to the Gentherm Incorporated 2023 Equity Incentive Plan) set forth in the Proxy Statement. Specifically, the fourth row in the table under the heading "WHAT VOTE IS REQUIRED TO APPROVE EACH ITEM OF BUSINESS?" on page 91 of the Proxy Statement is hereby revised in its entirety to read as follows:

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  |  |  | **HOW DO VOTES IMPACT APPROVAL OF PROPOSAL** | **HOW DO VOTES IMPACT APPROVAL OF PROPOSAL** | **HOW DO VOTES IMPACT APPROVAL OF PROPOSAL** | **HOW DO VOTES IMPACT APPROVAL OF PROPOSAL** |
| **PROPOSAL** | **PROPOSAL** | **REQUIRED APPROVAL** | **FOR** | **WITHHOLD / AGAINST** | **ABSTENTION** | **BROKER NON-VOTES** |
| 04 | Approval of an Amendment to the 2023 Equity Plan to increase by 1,700,000 the maximum number of shares of common stock that may be issued pursuant to Awards granted under the 2023 Equity Plan | Majority of votes cast | For the proposal | Against the proposal | Not a vote cast | Not a vote cast |

---

This Supplement does not otherwise change the voting standards included in the Proxy Statement or the proposals to be acted upon at the annual meeting.

If you have already returned your proxy or provided voting instructions, you do not need to take any action unless you wish to change or revoke your prior vote. Information on how to vote your shares, or change or revoke your prior vote, is available in the Proxy Statement.

This Supplement will also be made available to shareholders at www.proxyvote.com and under the Investors' section of our website at ir.Gentherm.com under the tab "Financial Info" and under the heading "SEC Filings."

------