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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 Delaware ( State or Other Jurisdiction of Incorporation or Organization ) FORM 10 - K □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ( Mark One ) 9 West 57th Street , 43rd Floor New York , NY ( Address of Principal Executive Offices ) OR Commission File Number 001-39739 Spartan Acquisition Corp. II ( Exact Name of Registrant as Specified in its Charter ) Title of each class Units , each consisting of one share of Class A common stock and one - half of one warrant Class A common stock , par value $ 0.0001 per share Warrants , each whole warrant exercisable for one Class A common stock at an exercise price of $ 11.50 per share to ( 212 ) 515-3200 Registrant's telephone number , including area code Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) SPRQ U SPRQ SPRQ WS 82-2599566 ( IRS Employer Identification No. ) None 10019 ( Zip Code ) Name of each exchange on which registered The New York Stock Exchange The New York Stock Exchange The New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : 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 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