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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 June 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number : 814-00659 PROSPECT CAPITAL CORPORATION ( Exact name of Registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) 10 East 40th Street , 42nd Floor New York , New York 10016 ( Zip Code ) Registrant's telephone number , including area code : ( 212 ) 448-0702 Securities registered pursuant to Section 12 ( b ) of the Act : ( Address of principal executive offices ) Title of each class Common Stock , par value $ 0.001 per share 6.875 % Notes due 2029 , par value $ 25 5.35 % Series A Fixed Rate Cumulative Perpetual Preferred Stock , par value $ 0.001 43-2048643 ( I.R.S. Employer Identification No. ) Trading Symbols Name of each exchange on which registered NASDAQ Global Select Market New York Stock Exchange New York Stock Exchange PSEC PBC PSEC PRA Securities registered pursuant to Section 12 ( g ) of the Act : 5.50 % Series A1 Preferred Stock , par value $ 0.001 5.50 % Series AA1 Preferred Stock , par value $ 0.001 5.50 % Series M1 Preferred Stock , par value $ 0.001 5.50 % Series M2 Preferred Stock , par value $ 0.001 5.50 % Series A2 Preferred Stock , par value $ 0.001 Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes ý No o 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 ý Accelerated filer o 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 ý 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 ( §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 o No o 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 . Large accelerated filer ý Non - accelerated filer o Smaller reporting company o Emerging growth company o ( Do not check if a smaller reporting 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 . O 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 . ý Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes o No ý