-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, NDphCEOIly4hxW/kyOM5OaR1Zesbe3/9faKrcrvLS8eYrvhAwN8a85jHS6R0xuEp 07L4/tT0Sh6JS6lRDK93nw== 0001140361-09-009333.txt : 20090409 0001140361-09-009333.hdr.sgml : 20090409 20090409160417 ACCESSION NUMBER: 0001140361-09-009333 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20090409 DATE AS OF CHANGE: 20090409 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: TREX CO INC CENTRAL INDEX KEY: 0001069878 STANDARD INDUSTRIAL CLASSIFICATION: LUMBER & WOOD PRODUCTS (NO FURNITURE) [2400] IRS NUMBER: 541910453 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-56187 FILM NUMBER: 09742804 BUSINESS ADDRESS: STREET 1: 160 EXETER DRIVE CITY: WINCHESTER STATE: VA ZIP: 22603-8605 BUSINESS PHONE: 5406784070 MAIL ADDRESS: STREET 1: 160 EXETER DRIVE CITY: WINCHESTER STATE: VA ZIP: 22603-8605 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: PZENA INVESTMENT MANAGEMENT LLC CENTRAL INDEX KEY: 0001027796 IRS NUMBER: 000000000 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: 120 WEST 45TH STREET, 20TH FL CITY: NEW YORK STATE: NY ZIP: 10036 BUSINESS PHONE: 2125831291 MAIL ADDRESS: STREET 1: 120 WEST 45TH STREET, 20TH FL CITY: NEW YORK STATE: NY ZIP: 10036 SC 13G/A 1 doc1.htm Schedule 13G

United States
Securities and Exchange Commission
Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934
(Amendment No. 05)*

OMB Number
3235-0145

Trex Company, Inc.
(Name of Issuer): Common Stock
(Title of Class of Securities): 89531P105
(CUSIP Number): March 31, 2009
(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

√	Rule 13d-1(b)
	Rule 13d-1(c)
	Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No.

Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).
PZENA INVESTMENT MANAGEMENT LLC
62-1612879
Check the Appropriate Box if a Member of a Group (See Instructions)
SEC Use Only
Citizenship or Place of Organization
Delaware

Number of Shares Beneficially Owned by Each Reporting Person With:

Sole Voting Power
583,039
Shared Voting Power
Sole Dispositive Power
754,439
Shared Dispositive Power

Aggregate Amount Beneficially Owned by Each Reporting Person
754,439
Check if the Aggregate Amount in Row 9 Excludes Certain Shares (See Instructions)
Percent of Class Represented by Amount in Row 9
4.9
Type of Reporting Person (See Instructions)
IA

Item 1.

Name of Issuer
Trex Company, Inc.
Address of Issuer's Principal Executive Offices
160 Exeter Drive
Winchester, VA 22603

Item 2.

Name of Person Filing
Pzena Investment Management, LLC
Address of Principal Business Office or, if None, Residence
120 West 45th Street, 20th fl
New York, NY 10036
Citizenship
Delaware
Title of Class of Securities
Common Stock
CUSIP Number
89531P105

Item 3. If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
√ An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4. Ownership

Amount beneficially owned:
754,439
Percent of class:
4.9%
Number of shares as to which the person has:
1. Sole power to vote or to direct the vote:
  583,039
2. Shared power to vote or to direct the vote:
3. Sole power to dispose or to direct the disposition of:
  754,439
4. Shared power to dispose or to direct the disposition of:

Item 5. Ownership of Five Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following √ .

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

CLIENTS OF THE FILING INVESTMENT MANAGER HAVE THE RIGHT TO RECEIVE AND THE ULTIMATE POWER TO DIRECT THE RECEIPT OF DIVIDENDS FROM, OR THE PROCEEDS OF SALE OF THE SECURITIES REPORTED ON HEREINABOVE. NO INTEREST OF ANY ONE OF SUCH CLIENTS RELATES TO MORE THAN FIVE PERCENT OF THE CLASS.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company

Not Applicable

Item 8. Identification and Classification of Members of the Group

Not Applicable

Item 9. Notice of Dissolution of Group

Not Applicable

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

April 09, 2009
Date: Pzena Investment Management, LLC
/s/ Joan Berger
Signature: Joan Berger
General Counsel & Chief Compliance Officer
Name / Title

NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties for whom copies are to be sent.

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001)

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