- Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Expires: February 28, 2011 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Cox James Mitchell

2. Date of Event Requiring Statement (MM/DD/YYYY) 5/7/2009

3. Issuer Name and Ticker or Trading Symbol

TREX CO INC [TWP]

(Last) (First) (Middle)

C/O TREX COMPANY, INC, 160 EXETER DRIVE

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director _____ 10% Owner
___ X ___ Officer (give title below) _____ Other (specify below)
Vice President, Sales /

(Street)

WINCHESTER, VA 22603-8605

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

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 Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock ⁽¹⁾	6667	D
Common Stock ⁽²⁾	5213	D
Common Stock ⁽³⁾	26666	D
Common Stock ⁽⁴⁾	10696	D
Common Stock ⁽⁵⁾	1477	D
Common Stock ⁽⁶⁾	15728	D
Common Stock	62808	D
Common Stock	3983	D

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Appreciation Right ⁽⁷⁾	2/18/2010	2/18/2019	Common Stock	21519	$13.44	D
Stock Appreciation Right	5/7/2009	2/21/2017	Common Stock	6825	$25.37	D
Stock Appreciation Right ⁽⁸⁾	2/21/2010	2/21/2017	Common Stock	3413	$25.37	D
Stock Appreciation Right ⁽⁹⁾	5/7/2009	2/8/2016	Common Stock	9700	$24.17	D
Stock Appreciation Right ⁽¹⁰⁾	5/7/2011	5/7/2018	Common Stock	37049	$9.14	D

Explanation of Responses:
( 1)	This restricted stock award vests on January 12, 2011.
( 2)	This restricted stock award vests on January 8, 2010.
( 3)	This restricted stock award vests in approximately two equal installments on January 8, 2010 and January 8, 2011.
( 4)	This restricted stock award vests over a three-year period in approximately three equal installments beginning on the first anniversary of the February 18, 2009 grant date.
( 5)	This restricted stock award vests on February 21, 2010.
( 6)	This restricted award vests over a three-year period in approximately three equal installments beginning on the first anniversary of the May 7, 2008 grant date.
( 7)	This stock appreciation right becomes exercisable in approximately three equal installments beginning on the first anniversary of the February 18, 2009 grant date.
( 8)	This stock appreciation right becomes execisable on February 21, 2010.
( 9)	This stock appreciation right is fully exercisable.
( 10)	This stock appreciation right becomes exercisable in approximately three equal annual installments beginning on the first anniversary of the May 7, 2008 grant date.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Cox James Mitchell C/O TREX COMPANY, INC 160 EXETER DRIVE WINCHESTER, VA 22603-8605			Vice President, Sales

Signatures
/s/ William R. Gupp by power of attorney		5/11/2009
^** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.