SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES 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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1. Name and Address of Reporting Person* Fernandez Amy M. (Last) (First) (Middle) C/O TREX COMPANY, INC. 2500 TREX WAY (Street) WINCHESTER VA 22601 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 07/26/2023	3. Issuer Name and Ticker or Trading Symbol TREX CO INC [ TREX ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) VP, GC and Secretary	5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	12,481	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Appreciation Right	03/01/2023	02/23/2032	Common Stock	517	82.01	D
Stock Appreciation Right	03/01/2024	02/23/2032	Common Stock	516	82.01	D
Stock Appreciation Right	03/01/2024	02/14/2033	Common Stock	1,197	56.8	D
Stock Appreciation Right	03/01/2025	02/23/2032	Common Stock	516	82.01	D
Stock Appreciation Right	03/01/2025	02/14/2033	Common Stock	1,197	56.8	D
Stock Appreciation Right	03/01/2026	02/14/2033	Common Stock	1,197	56.8	D

Explanation of Responses:

	/s/ Amy M. Fernandez	07/28/2023
	** 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 5 (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.
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