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* 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 ] Foreign Trading Symbol	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner Officer (give title below) Other (specify below) President and CEO
	3. Date of Earliest Transaction (Month/Day/Year) 11/05/2026
	4. If Amendment, Date of Original Filed (Month/Day/Year) 11/09/2026	6. Individual or Joint/Group Filing (Check Applicable Line) 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	11/05/2026		M		1,491(1)	A	$0	236,005	D
Common Stock	11/09/2026		S(2)		500	D	$55.84(3)	235,505	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
Stock Appreciation Right	$17.523	11/05/2026		M			2,170(4)	02/15/2018	02/15/2027	Common Stock	2,170	$0	0	D

Explanation of Responses:

1. Represents 1,491 shares of common stock issued upon settlement of the exercise of 2,170 stock appreciation rights reported in Table II. The number of shares issued was determined based on the excess of the fair market value of the Issuer's common stock on the exercise date over the SAR grant price.

2. The shares were sold to satisfy tax obligations arising from the exercise of the stock appreciation rights reported herein.

3. The price reported represents the weighted average sale price. The shares were sold in multiple transactions at prices ranging from $55.825 to $55.85, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, information regarding the number of shares sold at each separate price within the range set forth herein.

4. Represents the exercise of 2,170 stock appreciation rights. Each stock appreciation right entitled the Reporting Person, upon exercise, to receive the excess of the fair market value of one share of the Issuer's common stock on the exercise date over the SAR grant price of $17.523 per share. Based on a fair market value of $56.01 per share on the exercise date, the exercise was settled through the issuance of 1,491 shares of common stock, as reported in Table I. Following the exercise, no stock appreciation rights remain outstanding under this award.

Remarks:

This amendment is being filed solely to correct the price reported in Table I for the acquisition of shares upon settlement of the Reporting Person's stock appreciation rights. The price was inadvertently reported as $56.01 per share, which was the fair market value of the Issuer's common stock used to determine the settlement value of the stock appreciation rights. All other information in the original Form 4 remains unchanged.

	/s/ Amy M. Fernandez by power of attorney	11/09/2026
	** 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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