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TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( Mark One ) 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 FORM 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER : 814-00852 Maryland ( State of incorporation ) One Sansome Street , Suite 730 , San Francisco , CA ( Address of principal executive offices ) SuRo Capital Corp. ( Exact name of registrant as specified in its charter ) Title of Each Class Common Stock , par value $ 0.01 per share 27-4443543 ( I.R.S. Employer Identification No. ) 94104 ( Zip Code ) ( 650 ) 235-4769 ( Registrant's telephone number , including area code ) SECURITIES REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT : Trading Symbol SSSS Name of Each Exchange on Which Registered Nasdaq Capital Market 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 o 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 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 periods as 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 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes o No o Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , 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 . Large accelerated filer o Non - accelerated filer X ( Do not check if a smaller reporting company ) Emerging growth company o 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 . 0 Accelerated filer o Smaller reporting company o Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes o No 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 . O The aggregate market value of common stock beneficially owned by non - affiliates of the Registrant on June 30 , 2020 , based on the closing price on that date of $ 8.47 on the Nasdaq Capital Market , was $ 134,683,935 . For the purposes of calculating this amount only , all interested directors and executive officers of the Registrant have been treated as affiliates . There were 20,215,458 shares of the Registrant's common stock outstanding as of March 11 , 2021 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant's definitive proxy statement relating to the Registrant's 2021 annual meeting of stockholders ( the " 2021 Proxy Statement " ) , to be filed with the Securities and Exchange Commission ( the " SEC " ) within 120 days following the end of the Registrant's fiscal year , are incorporated by reference in Part III of this annual report on Form 10 - K as indicated herein .