TREX CO INC — Director's Dealing 2011

Nov 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-10-31

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-10-31	Common Stock	M	1875	$9.14	Acquired	35834	Direct
2011-10-31	Common Stock	F	448	$18.48	Disposed	35386	Direct
2011-10-31	Common Stock	D	927	$18.48	Disposed	34459	Direct
2011-10-31	Common Stock	S	687	$19.00	Disposed	33772	Direct
2011-11-01	Common Stock	M	1875	$9.14	Acquired	35647	Direct
2011-11-01	Common Stock	F	441	$18.21	Disposed	35206	Direct
2011-11-01	Common Stock	D	941	$18.21	Disposed	34265	Direct
2011-11-01	Common Stock	S	691	$18.00	Disposed	33574	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-10-31	Stock Appreciation Right	$9.14	M	1875	Disposed	2018-05-07	Common Stock (1875)	Direct
2011-11-01	Stock Appreciation Right	$9.14	M	1875	Disposed	2018-05-07	Common Stock (1875)	Direct

Footnotes

F1: 1,875 Stock Appreciation Rights (SARs) are being exercised pursuant to Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2010.

F2: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.

F3: 448 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.

F4: 441 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.

F5: 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.