Transaction Details

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $23.3125 to $24.00 inclusive. Shawn Sedaghat ("Mr. Sedaghat") 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. | The securities reported herein are directly held by Swan Family Office, LLC ("Swan Family Office"). Mr. Sedaghat may be deemed to beneficially own the reported securities by virtue of the fact that Mr. Sedaghat is the Managing Member of Swan Family Office. Each of Swan Family Office and Mr. Sedaghat disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed to be an admission that either Swan Family Office or Mr. Sedaghat is the beneficial owner of such securities for purposes of Section 16, or for any other purpose. | Trend (as defined in footnote (5) below) does not have beneficial ownership of these securities, and specifically disclaims beneficial ownership of these securities. This report shall not be deemed to be an admission that Trend is the beneficial owner of such securities for purposes of Section 16, or for any other purpose. | The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $23.885 to $24.00 inclusive. Mr. Sedaghat 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 (4) to this Form 4. | 4,170,667 of the securities reported in Table One, Column Five are held directly by Trend International Holding AG ("Trend"). Mr. Sedaghat (and together with Trend, the "Reporting Persons") may be deemed to beneficially own the reported securities by virtue of the fact that Mr. Sedaghat is the Chairman of the Board of, and controls, Trend. Each of Trend and Mr. Sedaghat disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16, except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed to be an admission that either Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. | 4,140 of the securities reported in Table One, Column Five (the "Director Shares") are directly held by Mr. Sedaghat. Trend does not have beneficial ownership, and specifically disclaims beneficial ownership of the Director Shares to which this filing relates for purposes of Section 16. This report shall not be deemed to be an admission that Trend is the beneficial owner of the Director Shares for purposes of Section 16, or for any other purpose.