Golub Capital BDC, Inc. Announces Public Offering

NEW YORK, June 6, 2017

The Company intends to use the net proceeds from the offering to invest in portfolio companies in accordance with its investment objective and strategies and for general corporate purposes. The Company will also pay operating expenses, including management and administrative fees, and may pay other expenses such as due diligence expenses relating to potential new investments, from the net proceeds of the offering. A portion of the net proceeds from the offering may be utilized to capitalize Senior Loan Fund LLC, an unconsolidated Delaware limited liability company that invests primarily in senior secured loans of middle-market companies and is co-managed by the Company and RGA Reinsurance Company. A portion of the net proceeds from the offering may also be used to capitalize GC SBIC VI, L.P., the Company's wholly-owned subsidiary, following which the Company expects GC SBIC VI, L.P. to issue debentures and make investments in accordance with the Company's investment strategy. The Company may also use a portion of the net proceeds from the offering to repay amounts outstanding under its credit facility.

Investors are advised to carefully consider the investment objective, risks, charges and expenses of the Company before investing.  The preliminary prospectus supplement dated June 6, 2017 and the accompanying prospectus dated January 26, 2017, which have been filed with the Securities and Exchange Commission, contain this and other information about the Company and should be read carefully before investing.

The information in the preliminary prospectus supplement, the accompanying prospectus and this press release is not complete and may be changed.  The preliminary prospectus supplement, the accompanying prospectus and this press release are not offers to sell any securities of the Company and are not soliciting an offer to buy such securities in any state where such offer and sale is not permitted.

The offering may be made only by means of a preliminary prospectus supplement and an accompanying prospectus, copies of which may be obtained from UBS Investment Bank, Attn: Prospectus Department, 1285 Avenue of the Americas, New York, NY 10019, or by calling (888) 827-7275.

ABOUT GOLUB CAPITAL BDC, INC.

Golub Capital BDC, Inc. ("Golub Capital BDC") is an externally-managed, non-diversified closed-end management investment company that has elected to be treated as a business development company under the Investment Company Act of 1940. Golub Capital BDC invests primarily in senior secured and one stop loans of U.S. middle-market companies that are often sponsored by private equity investors. Golub Capital BDC's investment activities are managed by its investment adviser, GC Advisors LLC, an affiliate of the Golub Capital group of companies ("Golub Capital").