Goldman Sachs BDC Inc美股招股说明书(2026-01-29版)

5.100% Notes due 2029 Affiliates of Goldman Sachs BDC, Inc. (“GS BDC”), including Goldman Sachs& Co. LLC, may use this prospectus addendum in connectionwith offers and sales in secondary markets related to market-making transactions in GS BDC’s outstanding 5.100% notes due 2029 (the “Notes”). Theseaffiliates of GS BDC may act as principal or agent in those transactions. Secondary market sales by any of these affiliates will be made at prices relatedto prevailing market prices at the time of sale. GS BDC will not receive any of the proceeds of those sales. These affiliates of GS BDC do not have anyobligation to make a market in the Notes, and may discontinue their market-making activities at any time without notice, in their sole discretion. The Notes being offered by use of this prospectus addendum were initially offered and sold pursuant to the GS BDCprospectus supplement, datedJanuary21, 2026, and the GS BDCprospectus, dated September29, 2023. You should refer to these documents for information regarding the terms ofthe Notes. Unless you are informed otherwise in the confirmation of sale, this prospectus addendum is being used in a market-making transaction. GS BDC is an externally managed specialty finance company that is a non-diversified, closed-end,management investment company that haselected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940, as amended (the “InvestmentCompany Act”). GS BDC is focused on lending to “middle-market companies,” a term GS BDC generally uses to refer to companies with between$5million and $200million of annual earnings before interest expense, income tax expense, depreciation and amortization (“EBITDA”) excludingcertainone-time, andnon-recurring items that are outside the operations of these companies. GS BDC’s investment objective is to generate currentincome and, to a lesser extent, capital appreciation primarily through direct originations of secured debt, including first lien, unitranche, including lastout portions of such loans, and second lien debt, and unsecured debt, including mezzanine debt, as well as through select equity investments. Investing in the Notes involves a high degree of risk and is highly speculative. Before investing in the Notes, youshould read the discussion of the material risks of investing in GS BDC’s securities in the section titled “Risk Factors”in GS BDC’s most recent Annual Report on Form 10-K, any subsequent Quarterly Report on Form 10-Q, and in theprospectus supplement and prospectus referenced above. Neither the SEC nor any state securities commission, nor any other regulatory body, has approved or disapproved of these securities ordetermined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is acriminal offense. Goldman Sachs& Co. LLC Prospectus Addendum dated January28, 2026.