TREX CO INC — Director's Dealing 2013

Apr 3, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2013-04-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-04-01	Common Stock	M	16000	$9.14	Acquired	125543	Direct
2013-04-01	Common Stock	D	3045	$48.02	Disposed	122498	Direct
2013-04-01	Common Stock	F	6180	$48.02	Disposed	116318	Direct
2013-04-01	Common Stock	S	439	$49.00	Disposed	115879	Direct
2013-04-01	Common Stock	S	400	$49.08	Disposed	115479	Direct
2013-04-01	Common Stock	S	200	$49.09	Disposed	115279	Direct
2013-04-01	Common Stock	S	100	$49.11	Disposed	115179	Direct
2013-04-01	Common Stock	S	2000	$49.12	Disposed	113179	Direct
2013-04-01	Common Stock	S	100	$49.14	Disposed	113079	Direct
2013-04-01	Common Stock	S	1000	$49.15	Disposed	112079	Direct
2013-04-01	Common Stock	S	100	$49.18	Disposed	111979	Direct
2013-04-01	Common Stock	S	100	$49.19	Disposed	111879	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-04-01	Stock Appreciation Right	$9.14	M	16000	Disposed	2018-05-07	Common Stock (16000)	Direct

Footnotes

F1: 16,000 Stock Appreciation Rights (SARs) are being exercised pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2013.

F2: 6,180 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.

F3: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2013.

F4: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.