Prospect Capital Corp

On August 29, 2023, Prospect Capital Corporation (the “ Company ”) filed a Form 12b-25 (the “ Original 12b-25 ”). The Original 12b-25 detailed that the Company was unable to file its Annual Report on Form 10-K for the fiscal year ended June 30, 2023 (the “ 2023 Form 10-K ”) within the prescribed time period without unreasonable effort or expense as the Company and its independent registered public accounting firm require additional time to complete the documentation of the audit of the Company’s consolidated financial statements as of and for the fiscal year ended June 30, 2023 in accordance with the standards of the Public Company Accounting Oversight Board and of the audit of the effectiveness of the Company’s internal control over financial reporting as of June 30, 2023, based upon criteria in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). The Company expects to file its Form 10-K within the extension period of 15 calendar days as provided by Rule 12b-25 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The Company does not expect any changes to its previously reported financial results, including the financial results previously reported in its August 29, 2023 press release, furnished as Exhibit 99.1 to the Company’s Current Report on Form 8-K filed August 29, 2023. This Amendment Number 1 to the Original 12b-25 is being filed solely to attach Exhibit 99.1, the statement of the Company’s independent registered public accounting firm in satisfaction of item (c) of Part II of Form 12b-25. Cautionary Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, including those relating to the filing of the 2023 Form 10-K, other than statements of historical fact included in this report are forward-looking statements

Prospect Capital Corporation (the “ Company ”) is unable to file its Annual Report on Form 10-K for the fiscal year ended June 30, 2023 (the “ 2023 Form 10-K ”) within the prescribed time period without unreasonable effort or expense as the Company and its independent registered public accounting firm require additional time to complete the documentation of the audit of the Company’s consolidated financial statements as of and for the fiscal year ended June 30, 2023 in accordance with the standards of the Public Company Accounting Oversight Board and of the audit of the effectiveness of the Company’s internal control over financial reporting as of June 30, 2023, based upon criteria in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). The Company expects to file its Form 10-K within the extension period of 15 calendar days as provided by Rule 12b-25 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The Company does not expect any changes to its previously reported financial results, including the financial results previously reported in its August 29, 2023 press release, furnished as Exhibit 99.1 to the Company’s Current Report on Form 8-K filed August 29, 2023. Cautionary Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, including those relating to the filing of the 2023 Form 10-K, other than statements of historical fact included in this report are forward-looking statements. When used in this report, words such as “anticipate,” “believe,” “estimate,” “expect,” “intend” and similar expressions, as they relate to the Company or its management team, identify forward-looking statements

Prospect Capital Corporation (the “ Company ”) is unable to file its Annual Report on Form 10-K for the fiscal year ended June 30, 2022 (the “ 2022 Form 10-K ”) within the prescribed time period without unreasonable effort or expense primarily because the Company requires additional time to complete its assessment of the effectiveness of its internal control over financial reporting and the Company’s independent registered accounting firm requires additional time to complete its audit of the Company’s internal control over financial reporting. Management is in the process of performing an assessment of the effectiveness of the Company’s internal control over financial reporting as of June 30, 2022, based upon criteria in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Although the assessment is not yet complete, we expect to report a material weakness in our internal control over financial reporting relating to the operation of management review controls over the valuation of collateralized loan obligations (“CLOs”), including management’s review procedures over the completeness and accuracy of the underlying data used in performing those review procedures. Additionally, we expect to report a material weakness relating to our control environment and monitoring activities; specifically, with respect to evaluating internal control deficiencies in a timely manner. As a result of the foregoing, the Company needs additional time to finalize its financial statements and related disclosures to be filed as part of the 2022 Form 10-K. The Company expects to file its 2022 Form 10-K within the extension period of 15 calendar days as provided by Rule 12b-25 under the Securities Exchange Act of 1934, as amended