TriMas (TRS) director Parker sells 15,000 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

TriMas Corp director Herbert K. Parker sold shares in a pre-planned trade. On the reported date, he executed an open-market sale of 15,000 shares of TriMas common stock at a weighted average price of $45.031 per share, through multiple trades between $45.000 and $45.120.

After this transaction, Parker directly holds 57,762 TriMas shares. The filing notes that these sales were carried out under a Rule 10b5-1 trading plan adopted on March 5, 2026, indicating they were pre-scheduled rather than opportunistic.

Insights

Equity compensation and insider-trading analyst

Director’s 15,000-share Rule 10b5-1 sale looks like a routine, pre-planned disposition.

Director Herbert K. Parker reported an open-market sale of 15,000 shares of TriMas common stock at a weighted average price of $45.031. Following the trade, he continues to hold 57,762 shares directly, indicating he retains a meaningful equity stake.

The filing specifies that these sales were effected under a Rule 10b5-1 trading plan adopted on March 5, 2026. Such plans pre-schedule trades, which generally reduces the informational content of the timing. With no derivative exercises and a sizable remaining position, this appears to be a routine liquidity event rather than a transformative signal.

Insider Trade Summary 10b5-1

Net Seller: 15,000 shares ($675,465)

Net Sell 1 txn

Insider Parker Herbert K

Role null

Sold 15,000 shs ($675K)

Type	Security	Shares	Price	Value
Sale	Common Stock	15,000	$45.031	$675K

Holdings After Transaction: Common Stock — 57,762 shares (Direct, null)

Footnotes (1)

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.000 to $45.120 inclusive. The reporting person undertakes to provide to TriMas Corporation, any security holder of TriMas Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4. These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026.

Key Figures

Shares sold: 15,000 shares Weighted average sale price: $45.031 per share Price range: $45.000–$45.120 per share +3 more

6 metrics

Shares sold 15,000 shares Open-market sale of TriMas common stock

Weighted average sale price $45.031 per share Average price across multiple trades

Price range $45.000–$45.120 per share Range of sale prices reported in footnote

Shares held after sale 57,762 shares Director’s direct holdings following transaction

Transaction date June 30, 2026 Date of reported open-market sale

Trading plan adoption date March 5, 2026 Rule 10b5-1 plan governing the sales

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, Form 4, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"within the ranges set forth in footnote (1) to this Form 4."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

common stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/01/2026 - 04:35 PM Accepted by SEC EDGAR 07/01/2026 - 04:34 PM Learn about SEC filing dates

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).

X

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^*

Parker Herbert K

(Last) (First) (Middle)

400 ATLANTIC STREET

(Street)

STAMFORD CONNECTICUT 06901

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
TRIMAS CORP [ TRS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	06/30/2026		S		15,000	D	$45.031(1)(2)	57,762	D

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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.000 to $45.120 inclusive. The reporting person undertakes to provide to TriMas Corporation, any security holder of TriMas Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.

2. These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026.

Remarks:

	/s/ Jodi F. Robin, as attorney-in-fact	07/01/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did TriMas (TRS) director Herbert K. Parker report?

Herbert K. Parker reported selling 15,000 shares of TriMas common stock in an open-market transaction at a weighted average price of $45.031 per share. The sale was disclosed on a Form 4 insider trading report filed with the SEC.

At what price did TriMas (TRS) shares sell in Herbert K. Parker’s Form 4 filing?

Parker’s Form 4 lists a weighted average sale price of $45.031 per TriMas share. The shares were sold in multiple trades at prices ranging from $45.000 to $45.120, as detailed in the filing’s footnote disclosure.

How many TriMas (TRS) shares does Herbert K. Parker hold after the reported sale?

After selling 15,000 shares, Herbert K. Parker directly holds 57,762 shares of TriMas common stock. This post-transaction holding figure is disclosed in the Form 4 and reflects his remaining direct ownership stake following the sale.

Was Herbert K. Parker’s TriMas (TRS) stock sale part of a Rule 10b5-1 plan?

Yes. The Form 4 states that Parker’s TriMas share sales were made under a Rule 10b5-1 trading plan adopted on March 5, 2026. Such plans pre-arrange trades, indicating the sales were scheduled in advance rather than timed discretionarily.

What does the weighted average price mean in Herbert K. Parker’s TriMas (TRS) Form 4?

The weighted average price of $45.031 reflects multiple TriMas share sales executed between $45.000 and $45.120. The filing notes Parker can provide detailed share counts at each individual price point upon request to investors or regulators.