TREX CO INC — Director's Dealing 2016

Sep 7, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2016-09-06

Reporting Person: Zambanini Adam Dante (Vice President, Marketing)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-09-06	Common Stock	M	3710	$13.10	Acquired	34396	Direct
2016-09-06	Common Stock	M	4282	$12.78	Acquired	38678	Direct
2016-09-06	Common Stock	M	3482	$21.94	Acquired	42160	Direct
2016-09-06	Common Stock	D	2906	$61.84	Disposed	39254	Direct
2016-09-06	Common Stock	F	2838	$61.84	Disposed	36416	Direct
2016-09-07	Common Stock	S	1956	$61.6058	Disposed	34460	Direct
2016-09-07	Common Stock	S	2272	$61.6145	Disposed	32188	Direct
2016-09-07	Common Stock	S	1502	$61.5965	Disposed	30686	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-09-06	Stock Appreciation Right	$13.10	M	3710	Disposed	2022-02-16	Common Stock (3710)	Direct
2016-09-06	Stock Appreciation Right	$12.78	M	4282	Disposed	2022-02-15	Common Stock (4282)	Direct
2016-09-06	Stock Appreciation Right	$21.94	M	3482	Disposed	2023-02-12	Common Stock (3482)	Direct

Footnotes

F1: Stock Appreciation Rights are being exercised pursuant to a Rule 10b5-1 Sales Plan adopted by the reporting person on June 1, 2016.

F2: 2,838 shares are being surrendered as allowed by the Company's 2014 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 Sales Plan adopted by the reporting person on June 1, 2016.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $61.40 to $61.85, inclusive. The reporting person undertakes to provide Trex Company, Inc., any security holder of Trex Company, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (4) to this Form 4.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $61.27 to $61.85, inclusive. The reporting person undertakes to provide Trex Company, Inc., any security holder of Trex Company, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (5) to this Form 4.