TREX CO INC — Director's Dealing 2021

Feb 25, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2021-02-23

Reporting Person: Gupp William R. (Sr VP,Gen. Counsel & Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-23	Common Stock	M	14000	$91.16	Acquired	14000	Direct
2021-02-23	Common Stock	D	842	$91.16	Disposed	116613	Direct
2021-02-23	Common Stock	F	5935	$91.16	Disposed	110678	Direct
2021-02-24	Common Stock	S	7223	$92.85	Disposed	103455	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-23	Stock Appreciation Right	$5.48	M	14000	Disposed	2023-02-12	Common Stock (14000)	Direct

Footnotes

F1: Stock Appreciation Rights (SARs) are being exercised pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 5, 2020.

F2: 5,935 shares are being surrendered as allowed by the Company's 2014 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted shares.

F3: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person on August 5, 2020.

F4: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.53 to $93.02, inclusive.