TREX CO INC — Director's Dealing 2026

Mar 3, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2026-03-01

Reporting Person: Zambanini Adam Dante (EVP, Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-03-01	Common Stock	A	3623	$41.42	Acquired	244713	Direct
2026-03-01	Common Stock	J	1928	$41.42	Disposed	242785	Direct
2026-03-01	Common Stock	F	8271	$41.42	Disposed	234514	Direct

Footnotes

F1: Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance of the Company.

F2: Represents the target number of performance-based restricted units which did not vest due to the performance condition not being satisfied.

F3: 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.