普罗斯佩克特资本美股招股说明书(2025-07-21版)

Subject to completionPreliminary Pricing Supplement datedJuly 21, 2025 Prospect Capital CorporationProspect Capital InterNotes7.500% Notes due 2028 (the "2028 Notes")7.750% Notes due 2030 (the "2030 Notes")8.000% Notes due 2032 (the "2032 Notes" and togetherwith the 2028 Notes and the 2030 Notes, the "Notes")® Filed under Rule424(b)(2), Registration Statement No.333-269714Preliminary Pricing Supplement No.1547, 1548 and 1549 — Dated Monday, July 21, 2025(To: Prospectus Dated February 10, 2023, Prospectus Supplement Dated February 10, 2023and Supplement to Prospectus Supplement Dated June 5, 2023) The Notes will be issued pursuant to the Indenture, dated as of February16, 2012, as amended and supplemented by that certain One Thousand Five HundredForty-Seventh, One Thousand Five Hundred Forty-Eighth and One Thousand Five Hundred Forty-Ninth Supplemental Indenture dated as of July 31, 2025. The date from which interest shall accrue on the Notes is Thursday, July 31, 2025. The “Interest Payment Dates” for the Notes shall be January 15 and July15 of each year, commencing January 15, 2026; the interest payable on any Interest Payment Date, will be paid to the Person in whose name the Notes (or one or morepredecessor Notes) is registered at the close of business on the Regular Record Date (as defined in the Indenture) for such interest, which shall be January 1 or July 1, asthe case may be, next preceding such Interest Payment Date. The Notes will be redeemable in whole or in part at any time or from time to time, at the option of Prospect Capital Corporation, on or after January 15, 2026at a redemption price of $1,000 per Note plus accrued and unpaid interest payments otherwise payable for the then-current semi-annual interest period accrued to, butexcluding, the date fixed for redemption and upon not less than 5days nor more that 60days prior notice to the noteholder and the trustee, as described in theprospectus. Notes will be sold to you at the selling price specified in this preliminary pricing supplement. The Purchasing Agent shall purchase notes from us at theselling price less the applicable gross concession specified in this preliminary pricing supplement. The Purchasing Agent may resell the notes it purchases to the agentsand selected dealers at the selling price less a concession that, at the discretion of the Purchasing Agent, may be less than or equal to the gross concession received bythe Purchasing Agent. Notes purchased by the agents and selected dealers on behalf of level-fee (investment or advisory) accounts may be sold to such accounts at the selling price less the applicable concession, and such agents and selected dealers shall not retain, as compensation, any portion of such Prospect Capital Corporation is a financial services company that lends to and invests in middle market, privately-held companies. We are organized as anexternally-managed, non-diversified closed-end management investment company that has elected to be treated as a business development company under theInvestment Company Act of 1940. Prospect Capital ManagementL.P. manages our investments and Prospect AdministrationLLC provides the administrative servicesnecessary for us to operate. This preliminary pricing supplement relates only to the securities described in the accompanying prospectus, is only a summary of changes and should beread together with the accompanying prospectus, including among other things the section entitled “Risk Factors” beginning on page11 of such prospectus. Thispreliminary pricing supplement and the accompanying prospectus contain important information you should know before investing in our securities. Please read itbefore you invest and keep it for future reference. We file annual, quarterly and current reports, proxy statements and other information about us with the Securities andExchange Commission, or the “SEC.” This information is available free of charge by contacting us at 10 East 40thStreet, 42nd Floor, New York, NY 10016 or bytelephone at (212)448-0702. The SEC maintains a website at www.sec.gov where such information is available without charge upon written or oral request. Ourinternet website address is www.prospectstreet.com. Information contained on our website is not incorporated by reference into this preliminary pricing supplement orthe accompanying prospectus and you should not consider information contained on our website to be part of this preliminary pricing supplement or the accompanyingprospectus. Neither the SEC nor any state securities commission has approved or disapproved of these securities or passed on the adequacy or accuracy of thispreliminary pricing supplement. Any representation to the contrary is a criminal offense. Obligations of Prospect Capital Corporation and any subsidiary of ProspectCapital Corporation are not guaranteed by the full faith and credit of the United States of America. Neither Prospect Capital Corporation nor any subsidiary of Prospec