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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 □ 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 : 001-39641 SUPERNOVA PARTNERS ACQUISITION COMPANY , INC . ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation ) 4301 50th Street NW Suite 300 , PMB 1044 Washington , D.C. ( Address of principal executive offices ) Registrant's telephone number , including area code : ( 202 ) 918-7050 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) Title of Each Class : Units , each consisting of one Class A common stock , $ 0.0001 par value , and one - third of one warrant to purchase one Class A common stock Class A common stock , par value $ 0.0001 per share Warrants to purchase Class A common stock SPNV.U 85-2800538 ( I.R.S. Employer Identification Number ) SPNV SPNV WS 20016 ( 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 : 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 Exchange 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 definition of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer 0 Accelerated filer U Non - 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 Exchange Act ) . Yes No As of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , the registrant's Class A common stock was not publicly traded . Accordingly , there was no market value for the registrant's Class A common stock on such date . At March 16 , 2021 , there were 40,250,000 shares of Class A common stock , $ 0.0001 par value , and 10,062,500 shares of Class B common stock , $ 0.0001 par value , issued and outstanding .