TriMas (NYSE: TRS) HR chief logs tax withholding and trust stake

Rhea-AI Filing Summary

TRIMAS CORP Chief Human Resources Officer Jill S. Stress reported a tax-related share withholding. On March 14, 2026, 1,999 shares of common stock were disposed of at $35.04 per share to satisfy a tax liability by delivering securities. After this transaction, she directly owned 23,990 shares of TriMas common stock.

The filing also reports indirect ownership of 15,933 shares of common stock held through the Jill S. Stress Revocable Trust dated July 27, 2022, providing additional context on her total reported stake in the company.

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Stress Jill S.

(Last) (First) (Middle)

38505 WOODWARD AVENUE

SUITE 200

(Street)

BLOOMFIELD HILLS MI 48304

(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		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Human Resources Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/14/2026

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	03/14/2026		F		1,999	D	$35.04	23,990	D
Common Stock								15,933	I	See footnote(1)

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. Through the Jill S. Stress Revocable Trust dated July 27, 2022

Remarks:

	/s/ Jodi F. Robin, as attorney-in-fact	03/16/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did TriMas (TRS) report for Jill S. Stress?

TriMas reported that Chief Human Resources Officer Jill S. Stress had 1,999 common shares disposed of to pay a tax liability by delivering securities. This was coded as a tax-withholding transaction, not an open-market share sale or purchase.

How many TriMas (TRS) shares were involved in the tax withholding?

The tax-withholding transaction involved 1,999 shares of TriMas common stock at a reported price of $35.04 per share. These shares were used to satisfy a tax liability, according to the Form 4 transaction code description.

How many TriMas (TRS) shares does Jill S. Stress hold after the transaction?

Following the tax-withholding disposition, Jill S. Stress directly owned 23,990 shares of TriMas common stock. The filing also shows an additional 15,933 shares held indirectly, giving a clearer picture of her overall reported holdings.

What indirect TriMas (TRS) holdings are reported for Jill S. Stress?

The filing reports 15,933 TriMas common shares held indirectly through the Jill S. Stress Revocable Trust dated July 27, 2022. This trust-related position is separate from her directly owned shares and reflects another component of her reported ownership.

Was the TriMas (TRS) insider transaction a market sale or a tax withholding?

The transaction was a tax withholding, not an open-market sale. It is coded as a disposition to pay a tax liability by delivering securities, indicating the shares were withheld to cover taxes rather than sold in the market.

Does the Form 4 show any TriMas (TRS) option exercises or other derivatives?

The Form 4 data provided does not list any derivative transactions or option exercises for this event. The derivative summary is empty, and the only reported disposition is the tax-withholding of 1,999 common shares on March 14, 2026.