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 Ended March 31, 2020 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 ...

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, 2019 OR __________________________________________________________________________________________________ TRIMAS CORPORATION (Exact Name of Registrant as Specified in Its Charter) (State or Othe ...

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 Ended September 30, 2019 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 (Stat ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 10-Q (Mark One) Commission file number 001-10716 TRIMAS CORPORATION (Exact name of registrant as specified in its charter) Delaware 38-2687639 ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended June 30, 2019 Or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Transition Period from to . Indicate b ...

Table of Contents Or o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Transition Period from to . UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 10-Q (Mark One) x Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Quarterly Period Ended March 31, 2019 (Exact name of registrant as specified in its charter) 38505 Woodward Avenue, Suite 200 Bloomfield Hills, Michigan 48304 Delaware (State ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 __________________________________________________________________________________________________ Form 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR o 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 _____________________________ ...