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( Mark One ) X 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 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 TO FOR THE TRANSITION PERIOD FROM Commission File Number : 001-38347 FORM 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , par value $ 0.01 per share Large accelerated filer Non - accelerated filer Nine Energy Service , Inc. ( Exact name of registrant as specified in its charter ) O 2001 Kirby Drive , Suite 200 Houston , TX 77019 ( Address of principal executive offices ) ( 281 ) 730-5100 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 80-0759121 ( I.R.S. Employer Identification No. ) NINE Securities registered pursuant to Section 12 ( g ) of the Act : None Yes o No X 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 o 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 X No o Name of each exchange on which registered New York Stock Exchange 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 x No ο 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 . Accelerated filer Smaller reporting company Emerging growth company O X 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 X The aggregate market value of the registrant's common stock held by non - affiliates of the registrant on the last business day of the registrant's most recently completed second fiscal quarter ( based on the closing sales price on the New York Stock Exchange on June 30 , 2020 ) was $ 31,916,670 . The number of shares of the registrant's common stock outstanding at March 4 , 2021 was 31,555,321 . DOCUMENTS INCORPORATED BY REFERENCE Information called for in Part III of this Annual Report on Form 10 - K is incorporated by reference to the registrant's Definitive Proxy Statement for its 2021 Annual Meeting of Stockholders .