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( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Large accelerated filer Non - accelerated filer Emerging Growth Company 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 Commission File Number 001-37988 3990 Rogerdale Rd ( Address of principal executive offices ) NexTier Oilfield Solutions Inc. ( Exact Name of Registrant as Specified in its Charter ) Title of Each Class Common Stock , $ 0.01 par value 0 0 0 Houston Texas to 38-4016639 ( I.R.S. Employer Identification No. ) ( 713 ) 325-6000 ( Registrant's telephone number , including area code ) Not Applicable . ( Former Name , Former Address , if Changed Since Last Report ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol NEX 77042 ( Zip code ) No No > Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes 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 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 Name of Each Exchange On Which Registered New York Stock Exchange 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 . Securities registered pursuant to Section 12 ( g ) of the Act : None Accelerated filer Smaller reporting company ■