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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 number 001-38025 U.S. WELL SERVICES , INC . ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of organization ) 1360 Post Oak Boulevard , Suite 1800 , Houston , TX ( Address of principal executive offices ) Title of each class CLASS A COMMON SHARES $ 0.0001 , par value WARRANTS □□□ 81-1847117 USWS USWSW ( I.R.S. Employer incorporation or Identification No. ) Registrant's telephone number , including area code ( 832 ) 562-3730 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 77056 ( Zip Code ) Name of each exchange on which registered NASDAQ Capital Market NASDAQ Capital Market Securities registered pursuant to section 12 ( g ) of the Act : None Yes No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . 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 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 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 Non - accelerated filer 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 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No The aggregate market value of the voting and non - voting common stock held by non - affiliates of the registrant computed as of June 30 , 2020 ( the last business day of the registrant's most recent completed second fiscal quarter ) based on the closing price of the Class A common stock on the Nasdaq Capital Market was $ 21,639,925 . As of March 2 , 2021 , the registrant had 83,600,445 shares of Class A Common Stock and 2,296,525 shares of Class B Common Stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Certain information required to be disclosed in Part III of this report is incorporated by reference from the registrant's definitive proxy statement or an amendment to this report , which will be filed with the SEC not later than 120 days after the end of the fiscal year covered by this report .