TREX CO INC — Director's Dealing 2012

Nov 26, 2012

SEC Form 5 — Annual Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2012-12-31

Reporting Person: Cox James Mitchell (Vice President, Sales)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-16	Common Stock	M	9700	$24.17	Acquired	129047	Direct
2012-08-16	Common Stock	M	6825	$25.37	Acquired	135872	Direct
2012-08-16	Common Stock	M	3413	$25.37	Acquired	139285	Direct
2012-08-16	Common Stock	M	37049	$9.14	Acquired	176334	Direct
2012-08-16	Common Stock	M	21519	$13.44	Acquired	197853	Direct
2012-08-16	Common Stock	M	9948	$17.41	Acquired	207801	Direct
2012-08-16	Common Stock	M	3515	$26.20	Acquired	211316	Direct
2012-08-16	Common Stock	D	47172	$29.41	Disposed	164144	Direct
2012-08-16	Common Stock	F	18810	$29.41	Disposed	145334	Direct
2012-08-16	Common Stock	S	16909	$29.51	Disposed	128425	Direct
2012-08-16	Common Stock	S	10000	$29.61	Disposed	118425	Direct
2012-08-17	Common Stock	S	35862	$29.97	Disposed	82563	Direct
2012-08-28	Common Stock	S	4044	$30.14	Disposed	78519	Direct
2012-08-29	Common Stock	S	3185	$30.14	Disposed	75334	Direct
2012-08-29	Common Stock	S	7553	$30.29	Disposed	67781	Direct
2012-08-31	Common Stock	S	12447	$30.29	Disposed	55334	Direct
2012-08-31	Common Stock	S	20000	$30.77	Disposed	35334	Direct
2012-09-13	Common Stock	S	6419	$33.26	Disposed	28915	Direct
2012-09-13	Common Stock	S	10000	$33.04	Disposed	18915	Direct
2012-09-13	Common Stock	S	359	$33.50	Disposed	18556	Direct
2012-09-13	Common Stock	S	18556	$33.50	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-16	Stock Appreciation Right	$24.17	M	9700	Disposed	2016-02-08	Common Stock (9700)	Direct
2012-08-16	Stock Appreciation Right	$25.37	M	6825	Disposed	2017-02-21	Common Stock (6825)	Direct
2012-08-16	Stock Appreciation Right	$25.37	M	3413	Disposed	2017-02-21	Common Stock (3413)	Direct
2012-08-16	Stock Appreciation Right	$9.14	M	37049	Disposed	2018-05-07	Common Stock (37049)	Direct
2012-08-16	Stock Appreciation Right	$13.44	M	21519	Disposed	2019-02-18	Common Stock (21519)	Direct
2012-08-16	Stock Appreciation Right	$17.41	M	9948	Disposed	2020-02-17	Common Stock (9948)	Direct
2012-08-16	Stock Appreciation Right	$26.20	M	3515	Disposed	2022-02-16	Common Stock (3515)	Direct

Footnotes

F1: 18,810 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.

F2: This stock appreciation right is fully exercisable.

F3: This stock appreciation right becomes exercisable in three equal annual installments beginning on the first anniversary of the grant date.