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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
842633	Trimas Corp	TRS	Metal Forgings & Stampings (3460)	382687639

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1446066	Mark A Zeffiro	39400 Woodward Avenue Suite 130 Bloomfield Hills MI 48304	Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-05-27	30,000	$1.01	64,400	No	4	M	Indirect	See Footnote
Common Stock	Disposition	2011-05-27	13,950	$20.95	50,450	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	See Footnote
No	4	S	Indirect	See Footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-05-27	30,000	$0.00	30,000	$1.01

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
30,000	2011-03-09	2019-03-09	No	4	D	Indirect

Footnotes

The second of three equal installments for options granted March 9, 2009 pursuant to the 2006 Long Term Equity Incentive plan vested on March 9, 2011.
Through the Aldo Mark Zeffiro Trust under agreement dated October 8, 2010, as Trustee.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.87 to $21.07 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 sold at each separate price within the ranges set forth in footnote (3) to this Form 4.