TREX CO INC — Director's Dealing 2011

May 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-05-04

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-04	Common Stock	S	100	$29.064	Disposed	118841	Direct
2011-05-04	Common Stock	S	200	$29.13	Disposed	118641	Direct
2011-05-04	Common Stock	S	100	$29.152	Disposed	118541	Direct
2011-05-04	Common Stock	S	100	$29.158	Disposed	118441	Direct
2011-05-04	Common Stock	S	262	$29.16	Disposed	118179	Direct
2011-05-04	Common Stock	S	400	$29.17	Disposed	117779	Direct
2011-05-04	Common Stock	S	38	$29.18	Disposed	117741	Direct
2011-05-04	Common Stock	S	100	$29.191	Disposed	117641	Direct
2011-05-04	Common Stock	S	100	$29.20	Disposed	117541	Direct
2011-05-04	Common Stock	S	200	$29.14	Disposed	117341	Direct
2011-05-04	Common Stock	S	100	$29.142	Disposed	117241	Direct
2011-05-04	Common Stock	S	300	$29.144	Disposed	116941	Direct
2011-05-04	Common Stock	S	200	$29.145	Disposed	116741	Direct
2011-05-04	Common Stock	S	200	$29.146	Disposed	116541	Direct
2011-05-04	Common Stock	S	300	$29.15	Disposed	116241	Direct

Footnotes

F1: 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.