TREX CO INC — Director's Dealing 2012

Jul 5, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2012-07-02

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-07-02	Common Stock	M	1418	$9.14	Acquired	35551	Direct
2012-07-02	Common Stock	D	417	$31.07	Disposed	35134	Direct
2012-07-02	Common Stock	F	423	$31.07	Disposed	34711	Direct
2012-07-02	Common Stock	S	100	$29.93	Disposed	34611	Direct
2012-07-02	Common Stock	S	100	$30.03	Disposed	34511	Direct
2012-07-02	Common Stock	S	100	$29.97	Disposed	34411	Direct
2012-07-02	Common Stock	S	100	$29.92	Disposed	34311	Direct
2012-07-02	Common Stock	S	87	$30.10	Disposed	34224	Direct
2012-07-02	Common Stock	S	163	$29.85	Disposed	34061	Direct
2012-07-02	Common Stock	S	100	$29.80	Disposed	33961	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-07-02	Stock Appreciation Right	$9.14	M	1418	Disposed	2018-05-07	Common Stock (1418)	Direct

Footnotes

F1: 1,418 Stock Appreciation Rights (SARs) are being exercised pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2011

F2: 423 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover payment of taxes currently due on the exercise of SARs.

F3: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2011.

F4: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.