144 0001269873 XXXXXXXX LIVE 0000842633 TRIMAS CORP 001-10716 38505 WOODWARD AVENUE SUITE 200 BLOOMFIELD HILLS MI 48304 2486315400 AMATO THOMAS A Former Director Common Wells Fargo Clearing Services

1 N. Jefferson Ave. St. Louis MO 63103

25000 919012.13 40641562 08/13/2025 Nasdaq Common 10/28/2022 Purchased during open window. Open Market N 5000 10/28/2022 cash Common 03/01/2024 Purchased during open window. Open Market N 10000 03/01/2024 cash Common 11/15/2024 Purchased during open window. Open Market N 10000 11/15/2024 cash N Thomas A. Amato

38505 WOODWARD AVENUE SUITE 200 BLOOMFIELD HILLS MI 48304

Common Shares of TRS 07/29/2025 63965 2241703.40 Thomas A. Amato

38505 WOODWARD AVENUE, SUITE 200 BLOOMFIELD HILLS, MI 48304

Common Shares of TRS 07/31/2025 13900 489988.50 Shares sold by the Thomas A. Amato Revocable Trust, Thomas A. Amato is a trustee and also a former director of Trimas Corp. 08/13/2025 Thomas A Amato