Trex (NYSE: TREX) COO equity grant and tax share surrender

Rhea-AI Filing Summary

Trex Company Executive Vice President and Chief Operating Officer Adam Dante Zambanini reported multiple equity-related stock transactions. He received a grant or award of 3,623 shares of common stock at $41.42 per share. An additional 1,928-share adjustment reflects the net difference between target and actual performance-based vesting. He also surrendered 8,271 shares at $41.42 per share to cover taxes due on previously granted restricted stock units under Trex's 2023 Stock Incentive Plan, leaving him with 234,514 directly held shares.

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^*

Zambanini Adam Dante

(Last) (First) (Middle)

2500 TREX WAY

C/O TREX COMPANY, INC.

(Street)

WINCHESTER VA 22601

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TREX CO INC [ TREX ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/01/2026

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	03/01/2026		A(1)		3,623	A	$41.42	244,713	D
Common Stock	03/01/2026		J(2)		1,928	D	$41.42	242,785	D
Common Stock	03/01/2026		F(3)		8,271	D	$41.42	234,514	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. Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

2. Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

3. 8,271 shares are being surrendered as allowed by the Company's 2023 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted stock units.

	/s/ Amy M. Fernandez by power of attorney	03/03/2026
	** 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).
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FAQ

What insider stock transactions did Trex (TREX) COO Adam Dante Zambanini report?

Adam Dante Zambanini reported a 3,623-share grant, a 1,928-share performance-based adjustment, and the surrender of 8,271 shares to cover taxes. All transactions involved Trex common stock at $41.42 per share and were reported as directly owned.

Was the 8,271-share Trex (TREX) transaction by Adam Zambanini an open-market sale?

No, the 8,271-share transaction was a tax-withholding disposition. The shares were surrendered under Trex’s 2023 Stock Incentive Plan to cover taxes due on previously granted restricted stock units, rather than being sold in the open market.

How many Trex (TREX) shares does Adam Zambanini hold after these Form 4 transactions?

After the reported transactions, Adam Zambanini directly holds 234,514 Trex common shares. This figure reflects the combined effect of the 3,623-share grant, the 1,928-share performance adjustment, and the 8,271-share surrender for tax obligations.

What does the 1,928-share Trex (TREX) adjustment represent for Adam Zambanini?

The 1,928-share transaction represents the net share difference between target performance-based shares and actual vested shares. It reflects the target number of performance-based restricted units that did not vest because the specified performance condition was not fully satisfied.

What type of equity plan governed Adam Zambanini’s Trex (TREX) tax share surrender?

The tax-related surrender of 8,271 Trex shares was allowed under the company’s 2023 Stock Incentive Plan. That plan permits using previously granted restricted stock units to satisfy current tax liabilities arising upon vesting or settlement of those awards.