TREX CO INC — Director's Dealing 2012

Aug 22, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2012-08-20

Reporting Person: Zambanini Adam Dante (Vice President, Marketing)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-20	Common Stock	M	1119	$9.14	Acquired	9550	Direct
2012-08-20	Common Stock	M	2729	$13.44	Acquired	12279	Direct
2012-08-20	Common Stock	D	1597	$29.36	Disposed	10682	Direct
2012-08-20	Common Stock	F	799	$29.36	Disposed	9883	Direct
2012-08-21	Common Stock	S	300	$29.02	Disposed	9583	Direct
2012-08-21	Common Stock	S	100	$29.03	Disposed	9483	Direct
2012-08-21	Common Stock	S	280	$29.04	Disposed	9203	Direct
2012-08-22	Common Stock	S	1152	$29.19	Disposed	8051	Direct
2012-08-22	Common Stock	S	200	$29.21	Disposed	7851	Direct
2012-08-22	Common Stock	S	100	$29.2201	Disposed	7751	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-20	Stock Appreciation Right	$9.14	M	1119	Disposed	2019-05-07	Common Stock (1119)	Direct
2012-08-20	Stock Appreciation Right	$13.44	M	2729	Disposed	2018-02-18	Common Stock (2729)	Direct

Footnotes

F1: 799 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover the payment of taxes currently due on the exercise of SARs.

F2: This stock appreciation right becomes exercisable in approximately three equal annual installments beginning on the first anniversary of the May 7, 2008 grant date.

F3: This stock appreciation right becomes exercisable in approximately three equal annual installments beginning on the first anniversary of the February 18, 2009 grant date.