TRIMAS CORP

(Former name or former address, if changed since last report.)

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Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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 13(a) of the Exchange Act.☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

As previously disclosed in a Current Report on Form 8-K filed on January 6, 2025, TriMas Corporation (the “Company”) has announced the planned transition of its President and Chief Executive Officer (“CEO”).

On February 11, 2025, to encourage the retention and continued focus of certain of the Company’s key officers during the transition of the CEO, the Company’s Board of Directors (the “Board”) and its Compensation Committee (the “Committee”) implemented an executive retention program consisting of certain award opportunities. The retention awards for the Company’s named executive officers are described below.