TREX CO INC — Director's Dealing 2012

Jun 5, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2012-06-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-06-01	Common Stock	M	1418	$9.14	Acquired	35759	Direct
2012-06-01	Common Stock	D	479	$27.05	Disposed	35280	Direct
2012-06-01	Common Stock	F	397	$27.05	Disposed	34883	Direct
2012-06-01	Common Stock	S	100	$28.10	Disposed	34783	Direct
2012-06-01	Common Stock	S	100	$28.00	Disposed	34683	Direct
2012-06-01	Common Stock	S	100	$28.02	Disposed	34583	Direct
2012-06-01	Common Stock	S	100	$28.04	Disposed	34483	Direct
2012-06-01	Common Stock	S	100	$27.89	Disposed	34383	Direct
2012-06-01	Common Stock	S	48	$27.93	Disposed	34335	Direct
2012-06-01	Common Stock	S	100	$27.88	Disposed	34235	Direct
2012-06-01	Common Stock	S	100	$27.85	Disposed	34135	Direct
2012-06-01	Common Stock	S	2	$27.83	Disposed	34133	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-06-01	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 Rule 10b5-1 trading plan adopted by the reporting person on November 14, 2011

F2: 397 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 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.