X0609 4 2026-08-12 0 0000842633 TRIMAS CORP TRS 0001399401 Tredwell Daniel P false 263 TRESSER BLVD. 9TH FLOOR STAMFORD CT 06901 1 0 0 0 0 Common Stock 2026-08-12 2026-08-13 4 P 0 63.692 39.631 A 63521.625 D Common Stock 7500 I By spouse The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.631 to $39.632 inclusive. The reporting person undertakes to provide to TriMas Corporation, any security holder of TriMas Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4. /s/ Jodi F. Robin, as attorney-in-fact 2026-08-14