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) 01/20/2010
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X 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	01/20/2010		J(1)		2,200,000	D	(2)	9,742,230(3)	I	See Footnotes(3)(12)
Common Stock	01/20/2010		J(1)		2,200,000	A	(2)	14,186,057(4)	I	See Footnotes(4)(12)
Common Stock	01/20/2010		J(1)		2,200,000	D	(2)	14,186,057(5)	I	See Footnotes(5)(12)
Common Stock	01/20/2010		J(1)		2,200,000	A	(2)	2,200,000(6)	I	See Footnotes(6)(12)
Common Stock								2,243,827(7)	I	See Footnotes(7)(12)
Common Stock								842,675(8)	I	See Footnotes(8)(12)
Common Stock								176,312(9)	I	See Footnotes(9)(12)
Common Stock								32,952(10)	I	See Footnotes(10)(12)
Common Stock								15,237,996(11)	I	See Footnotes(11)(12)

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

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)

1. Name and Address of Reporting Person* HIP INVESTMENT HOLDINGS I, LLC (Last) (First) (Middle) 177 BROAD STREET 10TH FLOOR (Street) STAMFORD CT 06901 (City) (State) (Zip)

Explanation of Responses:

1. On January 20, 2010, TriMas Investment Fund I, L.L.C. ("TIF I") distributed 2,200,000 shares of Common Stock to Heartland Industrial Partners, L.P. ("Heartland Partners"), its Managing Member. Heartland Partners then contributed such shares to its wholly-owned subsidiary, HIP Investment Holdings I, LLC ("Holdings"). Heartland Industrial Associates, L.L.C. ("Heartland"), is the General Partner of Heartland Partners and may be deemed to be an indirect beneficial owner of these securities and disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities except to the extent of its pecuniary interest therein.

2. See footnote 1 above. The price per share of Common Stock as of the close of business on January 20, 2010 was $6.97 per share.

3. These securities are owned directly by TIF I. Heartland Partners, the Managing Member of TIF I, and Heartland, the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of these securities 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.

4. 2,200,000 of these securities are owned directly by Heartland Partners. 9,742,230 of these securities are owned directly by TIF I and 2,243,827 of these securities are owned directly by Metaldyne Investment Fund I, L.L.C. ("MIF I"). Heartland Partners, as the Managing Member of TIF I and MIF I, and Heartland, the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of the securities held by TIF I and MIF I and each disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of such securities except to the extent of its pecuniary interest therein.

5. 2,200,000 of these securities are owned directly by Holdings. 9,742,230 of these securities are owned directly by TIF I and 2,243,827 of these securities are owned directly by MIF I. Heartland Partners, as the Managing Member of TIF I and MIF I and the sole member of Holdings, and Heartland as the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of the securities held by Holdings, TIF I, and MIF I and each disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of such securities except to the extent of its pecuniary interest therein.

6. These securities are owned directly by Holdings. Heartland Partners, as the sole member of Holdings, and Heartland, as the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of these securities 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.

7. These securities are owned directly by MIF I. Heartland Partners, as the Managing Member of MIF I, and Heartland, as the General Partner of Heartland Partners, may each be deemed to be an indirect beneficial owner of these securities 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.

8. These securities are owned directly by HIP Side-by-Side Partners, L.P. ("HIP Side-by-Side"). Heartland, as the General Partner of HIP Side-by-Side, may be deemed to be an indirect beneficial owner of these securities and disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities except to the extent of its pecuniary interest therein.

9. These securities are owned directly by TriMas Investment Fund II, L.L.C. ("TIF II"). Heartland, as the Managing Member of TIF II, may be deemed to be an indirect beneficial owner of these securities and disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities except to the extent of its pecuniary interest therein.

10. These securities are owned directly by Metaldyne Investment Fund II, L.L.C. ("MIF II"). Heartland, as the Managing Member of MIF II, may be deemed to be an indirect beneficial owner of these securities and disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of these securities except to the extent of its pecuniary interest therein.

11. 2,200,000 of these securities are owned directly by Holdings. 9,742,230 of these securities are owned directly by TIF I and 2,243,827 of these securities are owned directly by MIF I, 842,675 of these securities are owned directly by HIP Side-by-Side, 176,312 of these securities are owned directly by TIF II, and 32,952 of these securities are owned directly by MIF II. Heartland, as the Managing Member of TIF II and MIF II and the General Partner of HIP Side-by-Side and Heartland Partners,which is the Managing Member of TIF I and MIF I and the sole member of Holdings, may be deemed to be an indirect beneficial owner of the securities held by Holdings, TIF I, MIF I, HIP Side-by-Side, TIF II, and MIF II and disclaims beneficial ownership (as defined in Rule 16a-1(a)(2)) of the securities reported herein except to the extent of its pecuniary interest therein.

12. Heartland, Heartland Partners, Holdings, TIF I, MIF I, HIP Side-by-Side, TIF II and MIF II 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 Industrial Associates, L.L.C., which is the Managing Member of TIF II and MIF II, and the General Partner of HIP Side-by-Side and Heartland Partners, which is the Managing Member of TIF I and MIF I and the sole member of Holdings.

	/s/ Daniel P. Tredwell, Managing Member	01/21/2010
	/s/ Daniel P. Tredwell	01/21/2010
	** Signature of Reporting Person	Date
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