UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ Annual report pursuant to section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023 or ☐ Transition report pursuant to section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to . Commission file number 0-21810 GENTHERM INCORPORATED (Exact name of registrant as specified in its charter) Michigan 95-4318554 (State or other jurisdiction o ...