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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 For the fiscal year ended December 31 , 2020 or Transition Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 0-7099 CECO ENVIRONMENTAL CORP . CECO ENVIRONMENTAL Delaware ( State or other jurisdiction of incorporation or organization ) 14651 North Dallas Parkway Suite 500 Dallas , Texas ( Address of principal executive offices ) Large Accelerated Filer Non - Accelerated Filer Title of each class Common Stock , par value $ 0.01 per share 13-2566064 ( I.R.S. Employer Identification No. ) 75254 ( Zip Code ) Registrant's telephone number , including area code : ( 214 ) 357-6181 Securities registered under Section 12 ( b ) of the Act : Trading Symbol CECE Name of each exchange on which registered The NASDAQ Stock Market LLC 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 reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No X 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 , a smaller reporting company , or an emerging wth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , ” and “ emerging growth company " in Rule 12b - 2 of the Exchange Act . Accelerated Filer Smaller reporting company X X 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. 7262 ( 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 - The aggregate market value of voting and non - voting common stock held by non - affiliates of the registrant was $ 166.2 million based upon the closing market price and shares of common stock outstanding as of June 30 , 2020 , the last business day of our most recently completed second fiscal quarter . For the purpose of the foregoing calculation only , all directors and executive officers of the registrant and owners of more than 10 % of the registrant's common stock are assumed to be affiliates of the registrant . This determination of affiliate status is not necessarily conclusive for any other purpose . As of February 25 , 2021 , the registrant had 35,350,727 shares of common stock , par value $ 0.01 per share , outstanding . Documents Incorporated by Reference Portions of the definitive Proxy Statement for the 2021 Annual Meeting of Stockholders , which is to be filed with the Securities and Exchange Commission within 120 days of the fiscal year ended December 31 , 2020 , are incorporated by reference into Part III of this Annual Report to the extent described herein .