TREX CO INC — Director's Dealing 2013

Jun 5, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2013-06-03

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-06-03	Common Stock	M	18450	$13.44	Acquired	119115	Direct
2013-06-03	Common Stock	D	4551	$54.49	Disposed	114564	Direct
2013-06-03	Common Stock	F	6630	$54.49	Disposed	107934	Direct
2013-06-03	Common Stock	S	3054	$55.00	Disposed	104880	Direct
2013-06-03	Common Stock	S	100	$55.50	Disposed	104780	Direct
2013-06-03	Common Stock	S	300	$55.51	Disposed	104480	Direct
2013-06-03	Common Stock	S	85	$55.52	Disposed	104395	Direct
2013-06-03	Common Stock	S	700	$56.02	Disposed	103695	Direct
2013-06-03	Common Stock	S	100	$56.03	Disposed	103595	Direct
2013-06-03	Common Stock	S	100	$56.04	Disposed	103495	Direct
2013-06-05	Common Stock	S	7269	$53.50	Disposed	96226	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-06-03	Stock Appreciation Right	$13.44	M	18450	Disposed	2019-02-18	Common Stock (18450)	Direct

Footnotes

F1: 18,450 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: 6,630 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 exercisable in three equal installments beginning on the first anniversary of the grant date.