Business Combination Prospectus - Form 425

Filed by Blue Owl Capital Corporation

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: Blue Owl Capital Corporation III

Commission File No. 814-01345

File No. of Related Registration Statement: 333-281609

On November 7, 2024, Blue Owl Capital Corporation ("OBDC") held a conference call to discuss OBDC's financial results for the quarter ended September 30, 2024. The conference call contained information regarding the proposed acquisition (the "Merger") of Blue Owl Capital Corporation III ("OBDE") by OBDC. The following are excerpts from the transcript of OBDC's November 7, 2024 conference call discussing the proposed merger of OBDE and OBDC.

Craig Packer, CEO

***

•Finally, I want to provide an update on our previously announced merger with OBDE. As we discussed on our last earnings call, we expect this merger will streamline our direct lending platform, enhance our scale with a high-quality diversified portfolio that offers significant investment overlap, improve our trading liquidity profile for current and prospective shareholders, increase our access to lower cost sources of debt, and finally, drive operational efficiencies and cost savings. We also anticipate that it will drive NII accretion over both the near and long term, with an opportunity for NAV per share accretion.

•We achieved an important milestone in the merger process in mid-October when the joint proxy statement of OBDC and OBDE was declared effective by the SEC. The proxy solicitation process has begun and will conclude at each of our shareholder meetings scheduled for January 8th. Our current expectation is that the transaction will close in January 2025.

•We encourage all shareholders to review the proxy materials and vote your shares accordingly. As a reminder, the OBDC Board of Directors, myself included, has unanimously recommended shareholders vote in favor of the proposals on the ballot.

Jonathan Lamm, CFO

***

•Additionally, we believe we can further reduce costs through the synergies and liability optimization resulting from our anticipated merger with OBDE.

1

•We remain very pleased with our results and with what we have accomplished with our liability structure.

***

Forward-Looking Statements

Some of the statements in this script constitute forward-looking statements because they relate to future events, future performance or financial condition of OBDC or OBDE or the two-step merger (collectively, the "Mergers") of OBDE with and into OBDC. The forward-looking statements may include statements as to: future operating results of OBDC and OBDE and distribution projections; business prospects of OBDC and OBDE and the prospects of their portfolio companies; and the impact of the investments that OBDC and OBDE expect to make. In addition, words such as "anticipate," "believe," "expect," "seek," "plan," "should," "estimate," "project" and "intend" indicate forward-looking statements, although not all forward-looking statements include these words. The forward-looking statements contained in this script involve risks and uncertainties. Certain factors could cause actual results and conditions to differ materially from those projected, including the uncertainties associated with (i) the timing or likelihood of the Mergers closing; (ii) the expected synergies and savings associated with the Mergers; (iii) the ability to realize the anticipated benefits of the Mergers, including the expected accretion to net investment income and the elimination or reduction of certain expenses and costs due to the Mergers; (iv) the percentage of OBDC and OBDE shareholders voting in favor of the proposals submitted for their approval; (v) the possibility that competing offers or acquisition proposals will be made; (vi) the possibility that any or all of the various conditions to the consummation of the Mergers may not be satisfied or waived; (vii) risks related to diverting management's attention from ongoing business operations; (viii) the risk that shareholder litigation in connection with the Mergers may result in significant costs of defense and liability; (ix) changes in the economy, financial markets and political environment; (x) the impact of geo-political conditions, including revolution, insurgency, terrorism or war, including those arising out of the ongoing war between Russia and Ukraine and the escalated conflict in the Middle-East, including the Israel-Hamas conflict, and general uncertainty surrounding the financial and political stability of the United States (including uncertainties related to the 2024 U.S. presidential election), the United Kingdom, the European Union and China, on financial market volatility, global economic markets, and various markets for commodities globally such as oil and natural gas; (xi) future changes in law or regulations; (xii) conditions to OBDC's and OBDE's operating areas, particularly with respect to business development companies or regulated investment companies; (xiii) an economic downturn, elevated interest and inflation rates, ongoing supply chain and labor market disruptions, including those as a result of strikes, work stoppages or accidents, instability in the U.S. and international banking systems, and the risk of recession or a shutdown of government services could impact business prospects of OBDC and OBDE and their portfolio companies or following the closing of the Mergers, the combined company; (xiv) the ability of Blue Owl Credit Advisors LLC (the "Adviser") to locate suitable investments for the combined company and to monitor and administer its investments; (xv) the ability of the Adviser to attract and retain highly talented professionals; and (xvi) other considerations that may be disclosed from time to time in OBDC's and OBDE's publicly disseminated documents and filings with the Securities and Exchange Commission ("SEC"). OBDC and OBDE have based the forward-looking statements included in this script on information available to them on the date hereof, and they assume no obligation to update any such forward-looking statements. Although OBDC and OBDE undertake no obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise, you are advised to consult any additional disclosures that they may make directly to you or through reports that OBDC and OBDE in the future may file with the SEC, including

2

the Joint Proxy Statement and the Registration Statement (each as defined below), annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

Additional Information and Where to Find It

In connection with the Merger, OBDC and OBDE have filed with the SEC and intend to mail to their respective shareholders a joint proxy statement/prospectus (the "Joint Proxy Statement") and OBDC has filed with the SEC a registration statement on Form N-14 (the "Registration Statement") that includes the Joint Proxy Statement and a prospectus of OBDC. The Joint Proxy Statement and the Registration Statement contains important information about OBDC, OBDE, the Merger and related matters. This script 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 of 1933, as amended. SHAREHOLDERS OF OBDC AND OBDE ARE URGED TO READ THE JOINT PROXY STATEMENT AND THE REGISTRATION STATEMENT AND OTHER DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT OBDC, OBDE, THE MERGER AND RELATED MATTERS. Investors and security holders will be able to obtain the documentation filed with the SEC free of charge at the SEC's website, http://www.sec.gov and for documents filed by OBDC, from OBDC's website at https://www.blueowlcapitalcorporation.com and for documents filed by OBDE, from OBDE's website at https://www.blueowlcapitalcorporationiii.com.

Participation in the Solicitation

OBDC, its directors, certain of its executive officers and certain employees and officers of the Adviser and its affiliates may be deemed to be participants in the solicitation of proxies in connection with the Merger. Information about directors and executive officers of OBDC is set forth in the Joint Proxy Statement. OBDE, its directors, certain of its executive officers and certain employees and officers of Blue Owl Diversified Credit Advisors LLC and its affiliates may be deemed to be participants in the solicitation of proxies in connection with the Merger. Information about directors and executive officers of OBDE is set forth in the Joint Proxy Statement. Information regarding the persons who may, under the rules of the SEC, be considered participants in the solicitation of the OBDC and OBDE shareholders in connection with the Merger is contained in the Joint Proxy Statement. These documents may be obtained free of charge from the sources indicated above.

3