Filed by Golub Capital BDC, Inc.

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed under Rule 14a-12 of the Securities Exchange Act of 1934

Subject Company: Golub Capital Investment Corporation

Commission File No. 814-01128

On May 8, 2019, Golub Capital BDC, Inc. (“GBDC”) filed a current report on Form 8-K that contained a presentation discussing GBDC's financial results for the quarter ended March 31, 2019. The presentation was also made available under the "Events/Presentations" page within the "Investor Resources" section of GBDC's website (www.golubcapitalbdc.com). The presentation contained information regarding GBDC's proposed acquisition of Golub Capital Investment Corporation ("GCIC"). The following is an excerpt from the presentation discussing GBDC's proposed acquisition of GCIC.

Forward-Looking Statements

This communication may contain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Statements other than statements of historical facts included in this communication may constitute forward-looking statements and are not guarantees of future performance or results and involve a number of risks and uncertainties. Actual results may differ materially from those expressed or implied in the forward-looking statements as a result of a number of factors, including those described from time to time in filings with the Securities and Exchange Commission. GBDC undertakes no duty to update any forward-looking statement made herein. All forward-looking statements speak only as of the date of this communication.

Additional Information and Where to Find It

This communication relates to a proposed business combination involving GCIC and GBDC (the “Merger”), along with related proposals for which stockholder approval will be sought (collectively, the “Proposals”). In connection with the Proposals, each

of GCIC and GBDC intend to file relevant materials with the SEC, including a registration statement on Form N-14, which will include a joint proxy statement of GBDC and GCIC and a prospectus of GBDC (the “Proxy Statement”). This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act. STOCKHOLDERS OF EACH OF GCIC AND GBDC ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING THE PROXY STATEMENT WHEN IT BECOMES AVAILABLE, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS THERETO, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT GCIC, GBDC, THE MERGER AND THE PROPOSALS. Investors and security holders will be able to obtain the documents filed with the SEC free of charge at the SEC’s web site, http://www.sec.gov or, for documents filed by GBDC, from GBDC’s website at http://www.golubcapitalbdc.com.

Participants in the Solicitation

GCIC and GBDC and their respective directors, executive officers and certain other members of management and employees of GC Advisors LLC and its affiliates, may be deemed to be participants in the solicitation of proxies from the stockholders of GCIC and GBDC in connection with the Proposals. Information regarding the persons who may, under the rules of the SEC, be considered participants in the solicitation of the GCIC and GBDC stockholders in connection with the Proposals will be contained in the Proxy Statement when such document becomes available. This document may be obtained free of charge from the sources indicated above.