TREX CO INC — Director's Dealing 2011

Mar 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-03-01

Reporting Person: Cline James E (Vice President and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-01	Common Stock	M	8400	$7.52	Acquired	43862	Direct
2011-03-01	Common Stock	D	2064	$30.60	Disposed	41798	Direct
2011-03-01	Common Stock	F	2676	$30.60	Disposed	39122	Direct
2011-03-03	Common Stock	S	858	$31.15	Disposed	38264	Direct
2011-03-03	Common Stock	S	500	$31.16	Disposed	37764	Direct
2011-03-03	Common Stock	S	2	$31.18	Disposed	37762	Direct
2011-03-03	Common Stock	S	989	$31.20	Disposed	36773	Direct
2011-03-03	Common Stock	S	306	$31.21	Disposed	36467	Direct
2011-03-03	Common Stock	S	5	$31.22	Disposed	36462	Direct
2011-03-03	Common Stock	S	500	$31.22	Disposed	35962	Direct
2011-03-03	Common Stock	S	300	$31.23	Disposed	35662	Direct
2011-03-03	Common Stock	S	100	$31.24	Disposed	35562	Direct
2011-03-03	Common Stock	S	100	$31.26	Disposed	35462	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-01	Stock Appreciation Right	$7.52	M	8400	Disposed	2018-03-03	Common Stock (8400)	Direct

Footnotes

F1: 2,676 shares are being surrendered to cover the payment of taxes currently due on the exercise of SARs.

F2: This stock appreciation right becomes exerciseable in approximately three equal installments beginning on the first anniversary of the March 3, 2008 grant date.

F3: 8,400 Stock Appreciation Rights (SARs) are being exercised pursuant to Rule 10b5-1 trading plan adopted by the reporting person on May 10, 2010.

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