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: Gupp William R. (CAO, Gen. Counsel & Secretary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-06-03	Common Stock	M	1614	$13.44	Acquired	40287	Direct
2013-06-03	Common Stock	D	398	$54.49	Disposed	39889	Direct
2013-06-03	Common Stock	F	403	$54.49	Disposed	39486	Direct
2013-06-03	Common Stock	S	624	$55.00	Disposed	38862	Direct
2013-06-03	Common Stock	S	200	$55.50	Disposed	38662	Direct
2013-06-03	Common Stock	S	100	$55.51	Disposed	38562	Direct
2013-06-03	Common Stock	S	200	$55.55	Disposed	38362	Direct
2013-06-03	Common Stock	S	100	$55.90	Disposed	38262	Direct
2013-06-05	Common Stock	S	813	$53.50	Disposed	37449	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-06-03	Stock Appreciation Right	$13.44	M	1614	Disposed	2019-02-18	Common Stock (1614)	Direct

Footnotes

F1: 1,614 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: 403 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 stock appreciation rights.

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.