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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , DC 20549 ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K For the fiscal year ended September 30 , 2021 OR Maryland ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , $ 0.001 par value For the transition period from GLADSTONE CAPITAL CORPORATION ( Exact name of registrant as specified in its charter ) 1521 Westbranch Drive , Suite 100 McLean , Virginia ( Address of principal executive offices ) to Commission file number 814-00237 0 ( 703 ) 287-5800 ( Registrant's telephone number , including area code ) 54-2040781 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Act : Symbol GLAD 22102 ( Zip Code ) Name of each exchange on which registered The Nasdaq Stock Market LLC per share 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 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 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 , 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 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 . □ 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 12 b - 2 of the Act ) . Yes No . The aggregate market value of the voting common stock held by non - affiliates of the Registrant on March 31 , 2021 , based on the closing price on that date of $ 9.92 per share on the Nasdaq Global Select Market , was $ 313,762,317 . For the purposes of calculating this amount only , all directors and executive officers of the Registrant have been treated as affiliates . There were 34,304,371 shares of the Registrant's common stock , $ 0.001 par value per share , outstanding as of November 12 , 2021 . Documents Incorporated by Reference . Portions of the Registrant's definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A in connection with the Registrant's 2022 Annual Meeting of Stockholders , which will be filed subsequent to the date hereof , are incorporated by reference into Part III of this Form 10 - K . Such proxy statement will be filed with the Securities and Exchange Commission not later than 120 days following the end of the Registrant's fiscal year ended September 30 , 2021 .