Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period EndedMarch 31, 2024 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 001-10716 TRIMAS CORPORATION (Exact name of registrant as specified in its charter) Delaware 38-2687639 (State or ...