Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Gupp William R.
 2. Date of Event Requiring Statement (Month/Day/Year)
02/19/2008		 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)
V.P. & General Counsel
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WINCHESTER, VA 22603-8605		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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 6,718
D
 
Common Stock 16,917 (1)
D
 
Common Stock 26,917 (2)
D
 
Common Stock 28,912 (3)
D
 
Common Stock 29,188 (4)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 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)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Appreciation Right 02/08/2007(5) 02/08/2016 Common Stock 9,000 $ 24.17 D  
Stock Appreciation Right 02/21/2008(6) 02/21/2017 Common Stock 6,916 $ 25.37 D  
Stock Options (Right to buy) 02/21/2003 02/21/2012 Common Stock 8,559 $ 20 D  
Stock Options (Right to buy) 02/21/2003 02/21/2012 Common Stock 3,953 $ 20 D  
Stock Options (Right to buy) 05/21/2002 05/21/2011 Common Stock 16,000 $ 28.9 D  
Stock Options (Right to buy) 02/25/2004 02/25/2013 Common Stock 2,896 $ 35.95 D  
Stock Options (Right to buy) 02/19/2005 02/19/2014 Common Stock 4,475 $ 38.51 D  
Stock Options (Right to buy) 03/09/2006 03/09/2015 Common Stock 2,000 $ 46.71 D  
Stock Options (Right to buy) 03/09/2006 03/09/2015 Common Stock 1,466 $ 46.71 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Gupp William R.
C/O TREX COMPANY, INC.
160 EXETER DRIVE
WINCHESTER, VA 22603-8605		       V.P. & General Counsel  

Signatures

Lynn E. MacDonald 02/28/2008
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) This restricted stock award vests in approximately two equal installments on January 8, 2009 and January 8, 2010.
(6) This stock appreciation right becomes exerciseable in approximately three equal annual installments beginning on the first anniversary of the February 21, 2007 grant date.
(4) This restricted stock award vests on March 9, 2008.
(2) This restricted stock award vests over a three-year period in approximately three equal installments beginning on the first anniversary of the January 8, 2008 grant date.
(5) This stock appreciation right becomes exerciseable in approximately three equal annual installments beginning on the first anniversary of the February 8, 2006 grant date.
(3) This restricted stock award vests in approximately two equal installments on February 21, 2009 and February 21, 2010.

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