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✔ 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 Delaware ( State or Other Jurisdiction of Incorporation ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ΤΟ 6325 Digital Way Suite 460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 Indianapolis , Indiana ( Address of Principal Executive Offices ) FORM 10 - K Title of Each Class Common Stock , $ 0.0001 par value Warrants for Common Stock COMMISSION FILE NUMBER 37796 Infrastructure and Energy Alternatives , Inc. ( Exact Name of Registrant as Specified in Charter ) Registrant's telephone number , including area code : ( 800 ) 688-3775 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) IEA IEAWW Securities registered pursuant to Section 12 ( g ) of the Act : None 47-4787177 ( IRS Employer Identification No. ) 46278 ( Zip Code ) Name of Exchange on Which Registered The NASDAQ Stock Market LLC The NASDAQ Stock Market LLC 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 þ 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 such shorter period that the registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the past ninety days . þ Yes ¨ No Indicate check mark whether the registrant has submitted electronically , every Interactive Data File required to be submitted pursuant 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 ) . þ Yes " No Large accelerated filer ¨ Accelerated filer ¨ Non - accelerated filer þ Smaller reporting company Emerging growth Company 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 definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act : Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes þ No 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 . The aggregate market value of the registrant's outstanding Common Stock held by non - affiliates of the registrant computed by reference to the price at which the Common Stock was last sold as of the last business day of the registrant's most recently completed second fiscal quarter was approximately $ 43.5 million on June 30 , 2020. The registrant , solely for purposes of this required presentation , deemed the Board of Directors , Executive Officers and Infrastructure and Energy Alternatives , LLC as affiliates . Number of shares of Common Stock outstanding as of the close of business on March 8 , 2021 : 22,905,031 . Portions of the registrant's definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A for the 2020 annual meeting of shareholders is incorporated by reference in Part III of this Form 10 - K to the extent stated herein .