SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* HEARTLAND INDUSTRIAL ASSOCIATES LLC (Last) (First) (Middle) 177 BROAD STREET 10TH FLOOR (Street) STAMFORD CT 06901 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol TRIMAS CORP [ TRS ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 11/01/2010
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/01/2010		S		3,000,000	D	$14.75	11,904,972	I	See Footnote(1)(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These securities are owned directly by TriMas Investment Fund I, L.L.C. ("TIF I") and HIP Investment Holdings I, LLC ("HIP Holdings"). TIF I and HIP Holdings will sell 1,133,024 shares and 1,866,976 shares, respectively, as holders of record of such shares. Following the sale of these securities, TIF I will own 8,609,206 shares and HIP Holdings will no longer own any shares. Heartland Industrial Partners, L.P. ("Heartland Partners"), as the managing member of TIF I and HIP Holdings, 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 HIP Holdings. Following the sale of the securities, Heartland Partners will indirectly beneficially own 10,853,033 shares. Heartland and Heartland Partners each disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities, except to the extent of its pecuniary interest therein.

2. Heartland, Heartland Partners, TIF I and HIP Holdings may be deemed to be members of a group for purposes of Section 13(d) of the Securities Exchange Act of 1934.

Remarks:

Signature by Daniel P. Tredwell, as Managing Member of Heartland, which is General Partner of Heartland Partners, which is managing member of TIF I and HIP Holdings.

	/s/ Daniel P. Tredwell	11/03/2010
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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