[Form 4] TREX CO INC Insider Trading Activity

Rhea-AI Filing Summary

Trex Company, Inc. SVP and Chief Financial Officer buys shares on the open market. A Trex executive reported purchasing 15,000 shares of Trex common stock on 11/14/2025 in an open market transaction coded "P" for purchase. The weighted average purchase price was $31.9227 per share, with individual trade prices ranging from $31.835 to $31.93. Following this transaction, the executive beneficially owns 30,664 Trex shares in direct ownership.

Insights

Equity Compensation and Governance Analyst

CFO made a sizable open-market share purchase, increasing direct ownership and economic exposure to company equity.

The filing reports that the **SVP, Chief Financial Officer** of **Trex Company, Inc.** bought **15,000 shares of common stock** on 11/14/2025. The transaction is coded "P," indicating an open-market purchase, at a weighted average price of $31.9227 per share, with individual trades ranging from $31.835 to $31.93. After this transaction, the officer directly owns **30,664 shares** of common stock.

This type of transaction matters because it increases the officer’s direct stake in the company’s equity, which raises personal financial exposure to the company’s performance. The purchase was made in the open market rather than through an equity award or option exercise, and there are no derivative securities reported in Table II. The officer also commits, through the footnote, to provide detailed trade breakdowns on request, which supports transparency around the transaction pricing.

Key items to watch going forward include any additional Form 4 filings by this or other executives, which would show whether this is a one-time event or part of a pattern of insider activity. The transaction date of 11/14/2025 and filing date of 11/17/2025 also demonstrate timely reporting, which aligns with Section 16 requirements. Tracking changes in this officer’s shareholdings over time can help monitor the evolution of management’s direct equity exposure.

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
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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^*

Gandhi Prithvi

(Last) (First) (Middle)

C/O TREX COMPANY, INC.

2500 TREX WAY

(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)
	SVP, Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

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	11/14/2025		P		15,000	A	$31.9227(1)	30,664	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 purchased in multiple transactions at prices ranging from $31.835 to $31.93, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4.

	/s/ Amy M. Fernandez by power of attorney	11/17/2025
	** 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 TREX report on this Form 4?

The Form 4 reports that a Trex Company, Inc. executive purchased 15,000 shares of Trex common stock in an open market transaction on 11/14/2025.

At what price did the TREX executive buy the 15,000 shares?

The shares were bought at a weighted average price of $31.9227 per share, with individual trades executed between $31.835 and $31.93 per share.

How many TREX shares does the reporting person own after this transaction?

After the reported purchase, the executive beneficially owns 30,664 shares of Trex common stock in direct ownership.

What is the role of the reporting person at Trex Company, Inc. (TREX)?

The reporting person is an officer of Trex, serving as Senior Vice President and Chief Financial Officer.

Was this TREX insider transaction a purchase or a sale?

This was a purchase transaction, indicated by transaction code "P" in the Form 4.

How were the TREX share purchase prices described in the Form 4?

The filing notes that the reported price is a weighted average, and that the shares were purchased in multiple trades at prices ranging from $31.835 to $31.93.