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( 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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( D ) OF THE SECURITIES EXCHANGE ACT OF 1934 Cayman Islands ( State or other jurisdiction of incorporation or organization ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K For the transition period from to ACON S2 Acquisition Corp. ( Exact name of registrant as specified in its charter ) 001-39525 ( Commission File Number ) 1133 Connecticut Avenue NW Suite 700 , Washington , DC ( Address of principal executive offices ) Title of Each Class : Units , each consisting of one share of Class A common stock , $ 0.0001 par value , and one - third of one warrant Registrant's telephone number , including area code : ( 202 ) 454-1100 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol : Shares of Class A Ordinary Shares included as part of the units Redeemable warrants included as part of the units , each whole warrant exercisable for one share of Class A Ordinary Share at an exercise price of 11.50 STWOU STWO ■ 98-1550150 ( I.R.S. Employer Identification Number ) 20036 ( Zip Code ) Name of Each Exchange on Which Registered : The Nasdaq Stock Market LLC The Nasdaq Stock Market LLC STWOW The Nasdaq Stock Market LLC 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 and post 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 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 . X 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 securities were not publicly traded . The registrant's units began trading on the Nasdaq Capital Market ( “ NASDAQ " ) on September 17 , 2020 and the registrant's Class A ordinary shares , par value $ 0.0001 ( the " Class A ordinary shares " ) and warrants began trading on the NASDAQ on November 9 , 2020. As of December 31 , 2020 , the aggregate market value of the Class A ordinary shares outstanding , computed by reference to the closing sales price for the ordinary shares on December 31 , 2020 , as reported on the NASDAQ , was $ 252,000,000 ( based on the closing sales price of the STWO on December 31 , 2020 of $ 10.08 ) . As of March 17 , 2021 , 25,000,000 Class A ordinary shares , par value $ 0.0001 , and 6,250,000 Class B ordinary shares , par value $ 0.0001 , were issued and outstanding . Documents Incorporated by Reference : None .