TREX CO INC — Director's Dealing 2011

Jun 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-06-01

Reporting Person: KAPLAN RONALD W (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-06-01	Common Stock	M	16174	$8.80	Acquired	124719	Direct
2011-06-01	Common Stock	F	4728	$29.74	Disposed	119991	Direct
2011-06-01	Common Stock	D	4971	$29.74	Disposed	115020	Direct
2011-06-01	Common Stock	S	619	$30.51	Disposed	114401	Direct
2011-06-01	Common Stock	S	100	$30.47	Disposed	114301	Direct
2011-06-01	Common Stock	S	200	$30.46	Disposed	114101	Direct
2011-06-01	Common Stock	S	100	$30.36	Disposed	114001	Direct
2011-06-01	Common Stock	S	200	$30.35	Disposed	113801	Direct
2011-06-02	Common Stock	S	6475	$29.30	Disposed	107326	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-06-01	Stock Appreciation Right	$8.80	M	16174	Disposed	2018-01-07	Common Stock (16174)	Direct

Footnotes

F1: 16,174 Stock Appreciation Rights (SARs) are being exercised pursuant to Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2010.

F2: 4,728 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover the payment of taxes currently due on the exercise of SARs.

F3: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.

F4: The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2010.