TREX CO INC — Director's Dealing 2011

Feb 17, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-02-15

Reporting Person: KAPLAN RONALD W (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-15	Common Stock	S	100	$26.08	Disposed	132743	Direct
2011-02-15	Common Stock	S	1800	$26.06	Disposed	130943	Direct
2011-02-15	Common Stock	S	200	$26.055	Disposed	130743	Direct
2011-02-15	Common Stock	S	600	$26.0525	Disposed	130143	Direct
2011-02-15	Common Stock	S	400	$26.05	Disposed	129743	Direct
2011-02-15	Common Stock	S	200	$26.035	Disposed	129543	Direct
2011-02-15	Common Stock	S	1500	$26.03	Disposed	128043	Direct
2011-02-15	Common Stock	S	100	$26.025	Disposed	127943	Direct
2011-02-15	Common Stock	S	100	$26.02	Disposed	127843	Direct
2011-02-15	Common Stock	S	15000	$26.00	Disposed	112843	Direct
2011-02-15	Common Stock	F	19472	$26.00	Disposed	93371	Direct
2011-02-15	Common Stock	D	23714	$26.00	Disposed	69657	Direct
2011-02-16	Common Stock	S	100	$26.12	Disposed	69557	Direct
2011-02-16	Common Stock	S	200	$26.08	Disposed	69357	Direct
2011-02-16	Common Stock	S	100	$26.075	Disposed	69257	Direct
2011-02-16	Common Stock	S	100	$26.07	Disposed	69157	Direct
2011-02-16	Common Stock	S	100	$26.068	Disposed	69057	Direct
2011-02-16	Common Stock	S	200	$26.065	Disposed	68857	Direct
2011-02-16	Common Stock	S	400	$26.06	Disposed	68457	Direct
2011-02-16	Common Stock	S	100	$26.055	Disposed	68357	Direct
2011-02-16	Common Stock	S	100	$26.055	Disposed	68257	Direct
2011-02-16	Common Stock	S	100	$26.05	Disposed	68157	Direct
2011-02-16	Common Stock	S	1	$26.035	Disposed	68156	Direct
2011-02-16	Common Stock	S	100	$26.03	Disposed	68056	Direct
2011-02-16	Common Stock	S	594	$26.02	Disposed	67462	Direct
2011-02-15	Common Stock	M	70065	$8.80	Acquired	137527	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-15	Stock Appreciation Right	$8.80	M	70065	Disposed	2018-01-07	Common Stock (70065)	Direct

Footnotes

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

F2: 70,065 Stock Appreciation Rights (SARs) are being exercised pursuant to Rule 10b5-1 trading plan adopted by the reporting person on May 10, 2010.

F3: 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.

F4: 19,472 shares are being surrendered to cover payment of taxes currently due on the exercise of SARs, pursuant to Rule 10b5-1 trading plan.