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<title>Prepared By R.R. Donnelley Financial -- Form 8-K</title>
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<b>UNITED STATES </b></font></div>

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<b>SECURITIES AND EXCHANGE COMMISSION </b></font></div>

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<b>Washington D.C., 20549 </b></font></div>

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<b>Form 8-K </b></font></div> <div><font Size="1">&nbsp;</font></div>

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<b>Current Report </b></font></div>

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<b>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 </b></font></div>

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<b>Date Of Report (Date Of Earliest Event Reported):&nbsp;&nbsp;06/23/2005 </b></font></div>




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<b>TREX CO INC </b></font></div>

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<b>(Exact Name of Registrant as Specified in its Charter)</b></font></div>

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<b>Commission File Number:&nbsp;&nbsp;001-14649</b></font></div>

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<b>(State or Other Jurisdiction of</b></font>
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<div Align="center"><font Face="times New Roman" Size="2" Color="#000000"><b>(I.R.S. Employer</b></font>
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<b>Incorporation or Organization)</b></font>
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<b>Identification No.)</b></font>
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<b>160 Exeter Drive, Winchester, VA 22603-8605</b></font></div>


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<b>(Address of Principal Executive Offices, Including Zip Code)</b></font>
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<b>540-542-6300 </b></font>
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<b>(Registrant&#146;s Telephone Number, Including Area Code) </b></font>
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<b>Not Applicable </b></font>
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<b>(Former name or former address, if changed since last report) </b></font>
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<b>Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:<BR><BR>
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<b>[&nbsp;&nbsp;]&nbsp;&nbsp;
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)<BR><BR>

[&nbsp;&nbsp;]&nbsp;&nbsp;
Soliciting material pursuant to Rule 14a-12 under the Exchange Act(17CFR240.14a-12)<BR><BR>


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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act(17CFR240.14d-2(b))<BR><BR>


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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act(17CFR240.13e-4(c))
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Items to be Included in this Report</b>
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<b>Item 7.01.&nbsp;&nbsp;&nbsp;&nbsp;Regulation FD Disclosure</b></font>
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On June 23, 2005, Robert G. Matheny, Chairman and Chief Executive Officer of Trex Company, Inc. (the "Company"), terminated a sales plan, dated May 13, 2005, entered into pursuant to Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, relating to the sale of the Company's Common Stock.<p> The information in this Current Report on Form 8-K is furnished pursuant to Item 7.01 and shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section.</font>
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<b>Signature(s) </b></font>
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Pursuant to the Requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the Undersigned hereunto
duly authorized. </font>
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	TREX CO INC</font>
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	Date: June 24, 2005.</font>
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	By:</font>
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	/s/&nbsp;&nbsp;&nbsp;&nbsp;William R. Gupp</font>
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	William R. Gupp</font>
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	<div><font Face="times New Roman" Size="2" Color="#000000">Vice President and General Counsel</font>
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{"company-data": {"conformed-name": "TREX CO INC", "cik": "0001069878", "assigned-sic": "2400", "irs-number": "541910453", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14649", "film-number": "05914656"}, "business-address": {"street1": "160 EXETER DRIVE", "city": "WINCHESTER", "state": "VA", "zip": "22603-8605", "phone": "5406784070"}, "mail-address": {"street1": "160 EXETER DRIVE", "city": "WINCHESTER", "state": "VA", "zip": "22603-8605"}}
Prepared By R.R. Donnelley Financial -- Form 8-K
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C., 20549
Form 8-K
Current Report
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date Of Report (Date Of Earliest Event Reported):  06/23/2005
TREX CO INC
(Exact Name of Registrant as Specified in its Charter)
Commission File Number:  001-14649
DE
54-1910453
(State or Other Jurisdiction of
(I.R.S. Employer
Incorporation or Organization)
Identification No.)
160 Exeter Drive, Winchester, VA 22603-8605
(Address of Principal Executive Offices, Including Zip Code)
540-542-6300
(Registrant's Telephone Number, Including Area Code)
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
[  ]  
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[  ]  
Soliciting material pursuant to Rule 14a-12 under the Exchange Act(17CFR240.14a-12)
[  ]  
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act(17CFR240.14d-2(b))
[  ]  
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act(17CFR240.13e-4(c))
Items to be Included in this Report
Item 7.01.    Regulation FD Disclosure
On June 23, 2005, Robert G. Matheny, Chairman and Chief Executive Officer of Trex Company, Inc. (the "Company"), terminated a sales plan, dated May 13, 2005, entered into pursuant to Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, relating to the sale of the Company's Common Stock.
The information in this Current Report on Form 8-K is furnished pursuant to Item 7.01 and shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section.
Signature(s)
Pursuant to the Requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the Undersigned hereunto
duly authorized.
TREX CO INC
Date: June 24, 2005.
By:
/s/    William R. Gupp
William R. Gupp
Vice President and General Counsel