格拉德斯通投资美股招股说明书(2025-06-03版)

Up to $75,000,000 Common Stock This supplement is being filed to update, amend and supplement information in that certain prospectus supplement, dated May14, 2024, relatingto the offer and sale of shares of our common stock, par value $0.001 per share, from time to time through the sales agent named therein. Sales of ourcommon stock, if any, pursuant to this supplement, the prospectus supplement and the accompanying prospectus, dated April18, 2024, will be made insales deemed to be “at the market offerings” as defined in Rule 415(a)(4) under the Securities Act of 1933, as amended. This supplement should be read This supplement is being filed to reflect that we have entered into a sales agreement (the “M&T Sales Agreement”) with M&T Securities, Inc.(“M&T Securities”) and have amended our sales agreements with each of Oppenheimer& Co. Inc., B. Riley Securities, Inc. and Virtu Americas LLC inorder to add M&T Securities (as amended, the “Existing Sales Agreements”) as an additional sales agent, effective as of the date hereof. Accordingly,each reference to the term “sales agents” in the prospectus supplement are hereby amended to include M&T Securities and each reference to “SalesAgreements” is hereby amended to collectively refer to the M&T Sales Agreement and the Existing Sales Agreements. As of the date of this supplement, Oppenheimer& Co.