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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
1179822	Heartland Industrial Associates Llc	177 Broad Street 10Th Floor Stamford CT 06901		No	No	Yes	Yes

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	Disposition	2012-08-17	1,500,000	$20.75	3,904,972	No	4	S	Indirect	See Footnotes

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

Footnotes

These securities are owned directly by TriMas Investment Fund I, L.L.C. ("TIF I"). TIF I will sell 1,500,000 shares. Following the sale of these securities, TIF I will own 1,268,136 shares. Heartland Industrial Partners, L.P. ("Heartland Partners"), as the managing member of TIF I, and Heartland Industrial Associates L.L.C. ("Heartland"), as the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of the securities held by TIF I and each disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities except to the extent of its pecuniary interest therein.
Heartland, Heartland Partners and TIF I may be deemed to be members of a group for purposes of Section 13(d) of the Securities Exchange Act of 1934.