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: KAPLAN RONALD W (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-01	Common Stock	M	7785	$8.80	Acquired	128915	Direct
2011-03-01	Common Stock	D	2239	$30.60	Disposed	126676	Direct
2011-03-01	Common Stock	F	2342	$30.60	Disposed	124334	Direct
2011-03-01	Common Stock	S	2455	$29.92	Disposed	121879	Direct
2011-03-03	Common Stock	S	630	$31.15	Disposed	121249	Direct
2011-03-03	Common Stock	S	1000	$31.20	Disposed	120249	Direct
2011-03-03	Common Stock	S	100	$31.21	Disposed	120149	Direct
2011-03-03	Common Stock	S	700	$31.21	Disposed	119449	Direct
2011-03-03	Common Stock	S	500	$31.22	Disposed	118949	Direct
2011-03-03	Common Stock	S	174	$31.23	Disposed	118775	Direct
2011-03-03	Common Stock	S	100	$31.25	Disposed	118675	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-01	Stock Appreciation Right	$8.80	M	7785	Disposed	2018-01-07	Common Stock (7785)	Direct

Footnotes

F1: 2,239 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover the payment of taxes currently due on previously granted restricted shares.

F2: 7,785 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 stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.

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