TREX CO INC — Director's Dealing 2012

Sep 14, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2012-09-12

Reporting Person: Cline James E (Vice President and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-09-12	Common Stock	M	12000	$9.14	Acquired	65418	Direct
2012-09-12	Common Stock	D	3347	$32.77	Disposed	62071	Direct
2012-09-12	Common Stock	F	3652	$32.77	Disposed	58419	Direct
2012-09-14	Common Stock	S	100	$32.90	Disposed	58319	Direct
2012-09-14	Common Stock	S	100	$32.93	Disposed	58219	Direct
2012-09-14	Common Stock	S	100	$32.98	Disposed	58119	Direct
2012-09-14	Common Stock	S	100	$32.99	Disposed	58019	Direct
2012-09-14	Common Stock	S	200	$33.00	Disposed	57819	Direct
2012-09-14	Common Stock	S	100	$33.07	Disposed	57719	Direct
2012-09-14	Common Stock	S	200	$33.08	Disposed	57519	Direct
2012-09-14	Common Stock	S	100	$33.09	Disposed	57419	Direct
2012-09-14	Common Stock	S	100	$33.12	Disposed	57319	Direct
2012-09-14	Common Stock	S	100	$33.13	Disposed	57219	Direct
2012-09-14	Common Stock	S	200	$33.37	Disposed	57019	Direct
2012-09-14	Common Stock	S	100	$33.39	Disposed	56919	Direct
2012-09-14	Common Stock	S	100	$33.40	Disposed	56819	Direct
2012-09-14	Common Stock	S	200	$33.41	Disposed	56619	Direct
2012-09-14	Common Stock	S	100	$33.42	Disposed	56519	Direct
2012-09-14	Common Stock	S	300	$33.43	Disposed	56219	Direct
2012-09-14	Common Stock	S	500	$33.44	Disposed	55719	Direct
2012-09-14	Common Stock	S	100	$33.45	Disposed	55619	Direct
2012-09-14	Common Stock	S	500	$33.46	Disposed	55119	Direct
2012-09-14	Common Stock	S	200	$33.47	Disposed	54919	Direct
2012-09-14	Common Stock	S	200	$33.48	Disposed	54719	Direct
2012-09-14	Common Stock	S	401	$33.49	Disposed	54318	Direct
2012-09-14	Common Stock	S	400	$33.50	Disposed	53918	Direct
2012-09-14	Common Stock	S	100	$33.51	Disposed	53818	Direct
2012-09-14	Common Stock	S	400	$33.52	Disposed	53418	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-09-12	Stock Appreciation Right	$9.14	M	12000	Disposed	2018-05-07	Common Stock (12000)	Direct

Footnotes

F1: 12,000 Stock Appreciation Rights are being exercised pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2012.

F2: 3,652 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 28, 2012.

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