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Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K For the fiscal year ended December 31 , 2020 OR Delaware State or other jurisdiction of incorporation or organization ) For the transition period from Title of each class Common Stock , $ 0.0001 par value 2300 N. Field Street , Suite 1900 Dallas , Texas ( Address of principal executive offices ) Primoris Services Corporation ( Exact name of registrant as specified in its charter ) Commission file number : 001-34145 ( Registrant's Securities registered pursuant to Section 12 ( b ) of the Act : to ( 214 ) 740-5600 telephone number , including area code ) Trading symbol ( s ) PRIM Accelerated filer 20-4743916 ( I.R.S. Employer Identification No. ) 75201 ( Zip Code ) 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 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 Name of each exchange on which registered The Nasdaq Stock Market LLC 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 Non - accelerated filer 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 . Large 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. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . X 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 the voting common equity held by non - affiliates of the registrant was approximately $ 864.3 million based upon the closing price of such common equity as of June 30 , 2020 ( the last business day of the Registrant's most recently completed second fiscal quarter ) . On February 15 , 2021 there were 49,148,751 shares of common stock , par value $ 0.0001 , outstanding . For purposes of this Annual Report on Form 10 - K , in addition to those stockholders which fall within the definition of " affiliates " under Rule 405 of the Securities Act of 1933 , holders of ten percent or more of the Registrant's common stock are deemed to be affiliates . DOCUMENTS INCORPORATED BY REFERENCE The following documents are incorporated by reference into this Annual Report on Form 10 - K : Portions of the registrant's definitive Proxy Statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10 - K .