TriMas (NYSE: TRS) HR chief logs routine tax-withholding of company shares

Rhea-AI Filing Summary

TRIMAS CORP Chief Human Resources Officer Jill S. Stress reported a routine tax-related share disposition. On March 11, 2026, 1,128 shares of Common Stock were withheld at $36.93 per share to cover tax liabilities, not sold in the open market.

After this transaction, she directly holds 25,989 shares. An additional 15,933 shares are held indirectly through the Jill S. Stress Revocable Trust dated July 27, 2022, reflecting continued equity exposure to TRIMAS CORP.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Stress Jill S.

Role Chief Human Resources Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,128	$36.93	$42K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 25,989 shares (Direct); Common Stock — 15,933 shares (Indirect, See footnote)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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).

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)
03/11/2026

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	03/11/2026		F		1,128	D	$36.93	25,989	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	03/12/2026
	** 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 CORP (TRS) report for Jill S. Stress?

TRIMAS CORP reported that Chief Human Resources Officer Jill S. Stress had 1,128 Common Stock shares withheld at $36.93 per share on March 11, 2026 to satisfy tax obligations, a non-market tax-withholding disposition rather than an open-market sale.

Was the TRIMAS CORP (TRS) Form 4 transaction an open-market sale?

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. 1,128 shares were delivered at $36.93 per share to cover tax liabilities, categorized under transaction code F and described as payment of tax liability by delivering securities.

How many TRIMAS CORP (TRS) shares does Jill S. Stress hold after the Form 4 event?

Following the reported tax-withholding, Jill S. Stress directly owns 25,989 TRIMAS CORP Common Stock shares. The filing also lists 15,933 additional shares held indirectly through the Jill S. Stress Revocable Trust dated July 27, 2022, increasing her total reported exposure.

What does transaction code F mean in the TRIMAS CORP (TRS) Form 4?

Transaction code F on the TRIMAS CORP Form 4 indicates payment of an exercise price or tax liability using shares. Here it represents 1,128 shares of Common Stock delivered at $36.93 per share to satisfy tax obligations tied to equity compensation.

How are indirect TRIMAS CORP (TRS) holdings reported for Jill S. Stress?

The Form 4 shows 15,933 TRIMAS CORP shares as indirect holdings for Jill S. Stress, with a footnote stating they are held through the Jill S. Stress Revocable Trust dated July 27, 2022. This clarifies that some ownership is structured via a personal trust.

Does the TRIMAS CORP (TRS) Form 4 indicate any derivative exercises?

No derivative exercises are reported in this Form 4. The transactionSummary shows zero derivative transactions and zero exerciseShares, with the only disposition being 1,128 Common Stock shares withheld for taxes under transaction code F on March 11, 2026.