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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 x 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 Delaware ( State or Other Jurisdiction of Incorporation or Organization ) CAPSTAR SPECIAL PURPOSE ACQUISITION CORP . ( Exact name of registrant as specified in its charter ) 405 West 14th Street Austin , TX ( Address of principal executive offices ) Title of each class Form 10 - K Units , each consisting of one share of Class A Common Stock and one - half of one Warrant Commission file number : 001-39362 Class A Common Stock , par value $ 0.0001 per share Registrant's telephone number , including area code : ( 512 ) 340-7800 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) Warrants , each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $ 11.50 to CPSR.U CPSR CPSR WS 84-4730610 ( I.R.S. Employer Identification No. ) 78701 ( 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 x 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 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¨ Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted 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 x 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 x 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 the definitions of " large accelerated filer , ” “ accelerated filer , " " smaller reporting company , " and " emerging growth company ” in Rule 12b - 2 of the Exchange Act .