TREX CO INC — Director's Dealing 2017

May 17, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2017-05-16

Reporting Person: MERLOTTI FRANK H JR (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-16	Common Stock	M	2322	$7.43	Acquired	11718	Direct
2017-05-16	Common Stock	D	265	$65.33	Disposed	11453	Direct
2017-05-17	Common Stock	S	200	$63.41	Disposed	11253	Direct
2017-05-17	Common Stock	S	300	$63.57	Disposed	10953	Direct
2017-05-17	Common Stock	S	200	$63.62	Disposed	10753	Direct
2017-05-17	Common Stock	S	100	$63.64	Disposed	10653	Direct
2017-05-17	Common Stock	S	100	$63.75	Disposed	10553	Direct
2017-05-17	Common Stock	S	100	$63.7701	Disposed	10453	Direct
2017-05-17	Common Stock	S	100	$63.78	Disposed	10353	Direct
2017-05-17	Common Stock	S	100	$63.7801	Disposed	10253	Direct
2017-05-17	Common Stock	S	100	$63.85	Disposed	10153	Direct
2017-05-17	Common Stock	S	100	$63.88	Disposed	10053	Direct
2017-05-17	Common Stock	S	100	$63.90	Disposed	9953	Direct
2017-05-17	Common Stock	S	100	$63.91	Disposed	9853	Direct
2017-05-17	Common Stock	S	100	$63.93	Disposed	9753	Direct
2017-05-17	Common Stock	S	100	$63.95	Disposed	9653	Direct
2017-05-17	Common Stock	S	257	$64.46	Disposed	9396	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-16	Stock Appreciation Right	$7.43	M	2322	Disposed	2019-07-21	Common Stock (2322)	Direct

Footnotes

F1: Stock Appreciation Rights (SARs) are being exercised pursuant to a Rule 10b5-1 Exercise plan adopted by the reporting person on February 22, 2017.

F2: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Sales plan adopted by the reporting person on February 22, 2017.