Adam Dante Zambanini - 24 Feb 2026 Form 4 Insider Report for TREX CO INC (TREX)

Role: EVP, Chief Operating Officer
Signature: /s/ Amy M. Fernandez by power of attorney
Issuer symbol: TREX
Transactions as of: 24 Feb 2026
Net transactions value: +$1,567,971
Form type: 4
Filing time: 25 Feb 2026, 20:39:18 UTC
Previous filing: 04 Mar 2025
Next filing: 03 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zambanini Adam Dante	EVP, Chief Operating Officer	2500 TREX WAY, C/O TREX COMPANY, INC., WINCHESTER	/s/ Amy M. Fernandez by power of attorney	25 Feb 2026	0001512909

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TREX	Common Stock	Award	$783,985	+18,914	+9.3%	$41.45	222,176	24 Feb 2026	Direct	F1
transaction	TREX	Common Stock	Award	$783,985	+18,914	+8.5%	$41.45	241,090	24 Feb 2026	Direct	F2

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

Explanation of Responses:

Id	Content
F1	This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028 and March 1, 2029.
F2	This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

Content

This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028 and March 1, 2029.

This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.