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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 0 For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware ( State or other jurisdiction of incorporation or organization ) For the transition period from Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common stock 160 Exeter Drive , Winchester , Virginia ( Address of principal executive offices ) to Commission file number : 001-14649 Trex Trex Company , Inc. ( Exact name of registrant as specified in its charter ) (540)542-6300 Registrant's telephone number , including area code : Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) TREX Securities registered pursuant to Section 12 ( g ) of the Act : None 54-1910453 ( I.R.S. Employer Identification No. ) 22603-8605 ( Zip Code ) Name of each exchange on which registered New York Stock Exchange No | Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Yes Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , or a smaller reporting Company . See the definitions of " large accelerated filer , " " accelerated filer " and " smaller reporting Company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Non - accelerated filer The number of shares of the registrant's common stock outstanding on January 29 , 2021 was 115,799,503 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the following documents are incorporated by reference in this Form 10 - K as indicated herein : Document Proxy Statement relating to Registrant's 2021 Annual Meeting of Stockholders Accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 762 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell Company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No 冈 The aggregate market value of the registrant's common equity held by non - affiliates of the registrant at June 30 , 2020 , which was the last business day of the registrant's most recently completed second fiscal quarter , was approximately $ 7.5 billion based on the closing price of the common stock as reported on the New York Stock Exchange on such date and assuming , for purposes of this computation only , that the registrant's directors , executive officers and beneficial owners of 10 % or more of the registrant's common stock are affiliates . 000 Part of 10 - K into which incorporated Part III