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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES ACT OF 1934 For the fiscal year ended December 31 , 2020 Delaware ( State or incorporation ) 3556 Lake Shore Road OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to GIBRALTAR INDUSTRIES FORM 10 - K Commission File Number 0-22462 GIBRALTAR INDUSTRIES , INC . Securities registered pursuant to Section 12 ( b ) of the Act : P.O. Box 2028 Buffalo , New York ( Address of principal executive offices ) Title of each class Common Stock , $ 0.01 par value per share Large accelerated filer > Non - accelerated filer Registrant's telephone number , including area code : ( 716 ) 826-6500 Trading Symbol 16-1445150 ( I.R.S. Employer Identification No. ) ROCK Securities registered pursuant to Section 12 ( g ) of the Act : NONE 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 report pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No 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 Accelerated filer Smaller reporting company 14219-0228 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 and post such files ) . Yes > No Name of each exchange on which registered NASDAQ Stock Market Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definition of " large accelerated filer " , " accelerated filer ” , “ small reporting company " , and " emerging growth company " in Rule 12b - 2 of the Exchange Act . DOCUMENTS INCORPORATED BY REFERENCE 1 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 . Emerging growth company 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. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes No | Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Aggregate market value of voting Common Stock held by non - affiliates of the registrant as of June 30 , 2020 was : $ 1.5 billion . As of February 24 , 2021 , the number of common shares outstanding was : 32,570,961 . Portions of the Registrant's Definitive Proxy Statement to be filed for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10 - K .