TREX CO INC — Director's Dealing 2013

Jul 3, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2013-07-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-07-01	Common Stock	M	1614	$13.44	Acquired	39063	Direct
2013-07-01	Common Stock	D	461	$47.08	Disposed	38602	Direct
2013-07-01	Common Stock	F	382	$47.08	Disposed	38220	Direct
2013-07-01	Common Stock	S	24	$47.57	Disposed	38196	Direct
2013-07-01	Common Stock	S	200	$47.61	Disposed	37996	Direct
2013-07-01	Common Stock	S	100	$47.62	Disposed	37896	Direct
2013-07-01	Common Stock	S	200	$47.64	Disposed	37696	Direct
2013-07-01	Common Stock	S	100	$47.65	Disposed	37596	Direct
2013-07-01	Common Stock	S	100	$47.69	Disposed	37496	Direct
2013-07-01	Common Stock	S	100	$47.70	Disposed	37396	Direct
2013-07-01	Common Stock	S	300	$47.78	Disposed	37096	Direct
2013-07-01	Common Stock	S	100	$47.80	Disposed	36996	Direct
2013-07-03	Common Stock	S	100	$45.14	Disposed	36896	Direct
2013-07-03	Common Stock	S	100	$45.33	Disposed	36796	Direct
2013-07-03	Common Stock	S	71	$45.43	Disposed	36725	Direct
2013-07-03	Common Stock	S	200	$45.51	Disposed	36525	Direct
2013-07-03	Common Stock	S	100	$45.54	Disposed	36425	Direct
2013-07-03	Common Stock	S	200	$45.55	Disposed	36225	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-07-01	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: 382 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.