SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* FAIRBANKS BRYAN HORIX (Last) (First) (Middle) TREX COMPANY, INC. 160 EXETER DRIVE (Street) WINCHESTER VA 22603 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol TREX CO INC [ TREX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) VP and CFO
	3. Date of Earliest Transaction (Month/Day/Year) 02/13/2019
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/13/2019		A(1)		5,373	A	$77.7	49,739(2)	D
Common Stock	02/13/2019		F(3)		5,101	D	$77.7	44,638	D
Common Stock	02/13/2019		A(4)		2,618	A	$77.7	47,256	D
Common Stock	02/13/2019		A(5)		3,740	A	$77.7	50,996	D
Common Stock	02/14/2019		F(6)		333	D	$78.34	50,663	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Appreciation Right	$77.7	02/13/2019		A(7)		2,950		02/13/2019	02/13/2029	Common Stock	2,950	$77.7	2,950	D

Explanation of Responses:

1. Represents net share difference between target performance-based shares and actual vested shares, based upon actual performance for the Company.

2. On June 18, 2018, the Company effectuated a two-for-one stock split to common shareholders of record on May 23,2018. The amounts set forth in this Form 4 and all subsequent reports filed report the amounts adjusted to reflect the stock split.

3. 5,101 shares are being surrendered as allowed by the Company's 2014 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted shares and restricted stock units.

4. This restricted stock unit vests over a three-year period in three equal annual installments beginning on the first anniversary of the grant date.

5. This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments beginning on the first anniversary of the grant date. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company, and will range from 0% to 200% of the target number of shares.

6. 333 shares are being surrendered as allowed by the Company's 2014 Stock Incentive Plan to cover payment of taxes currently due on previously granted restricted shares.

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

	/s/ William R. Gupp by power of attorney	02/15/2019
	** Signature of Reporting Person	Date
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