TREX CO INC — Director's Dealing 2011

Apr 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-04-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-01	Common Stock	M	1875	$9.14	Acquired	40850	Direct
2011-04-01	Common Stock	F	576	$33.33	Disposed	40274	Direct
2011-04-01	Common Stock	D	514	$33.33	Disposed	39760	Direct
2011-04-01	Common Stock	S	300	$32.80	Disposed	39460	Direct
2011-04-01	Common Stock	S	100	$32.81	Disposed	39360	Direct
2011-04-01	Common Stock	S	100	$32.84	Disposed	39260	Direct
2011-04-01	Common Stock	S	187	$32.86	Disposed	39073	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-01	Stock Appreciation Right	$9.14	M	1875	Disposed	2018-05-07	Common Stock (1875)	Direct

Footnotes

F1: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.

F2: 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.

F3: 576 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: 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.