Prithvi Gandhi - 14 Nov 2025 Form 4 Insider Report for TREX CO INC (TREX)

Role: SVP, Chief Financial Officer
Signature: /s/ Amy M. Fernandez by power of attorney
Issuer symbol: TREX
Transactions as of: 14 Nov 2025
Transactions value $: $478,841
Form type: 4
Filing time: 17 Nov 2025, 08:51:47 UTC
Previous filing: 07 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gandhi Prithvi	SVP, Chief Financial Officer	C/O TREX COMPANY, INC., 2500 TREX WAY, WINCHESTER	/s/ Amy M. Fernandez by power of attorney	17 Nov 2025	0001791227

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TREX	Common Stock	Purchase	$479K	+15K	+95.76%	$31.92	30.7K	14 Nov 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.

Content

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.