UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): July 13, 2022 (July 8, 2022)

Golub Capital BDC 4, Inc.

(Exact name of Registrant as Specified in Its Charter)

200 Park Avenue, 25th Floor, New York, NY 10166

(Address of Principal Executive Offices)  (Zip Code)

Registrant’s telephone number, including area code: (212) 750-6060

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b- 2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company þ

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. þ

On July 8, 2022, Golub Capital BDC 4, Inc. (the “Company”) and Golub Capital BDC 4 Funding LLC (“GBDC 4 Funding”), a direct, wholly owned subsidiary of the Company, entered into a Revolving Credit and Security Agreement (the “PNC Facility”) with the lenders from time to time parties thereto, PNC Bank, National Association, as administrative agent, collateral agent, and a lender, and PNC Capital Markets LLC, as structuring agent. Under the PNC Facility, the lenders have agreed to extend credit to the Company in an aggregate amount of up to $80,000,000, subject to leverage and borrowing base restrictions, with a stated maturity date of July 8, 2025.

Borrowings under the PNC Facility will bear interest, at the Company’s election and depending on the currency of the borrowing, of either Term SOFR, Daily Simple SOFR, the Eurocurrency Rate, SONIA, or the €STR (each, as defined in the PNC Facility) plus a margin ranging from 1.75% to 2.25%, depending on the degree of uncalled capital commitments coverage of the PNC Facility’s borrowing base versus the assets of GBDC 4 Funding securing the facility. The Company will pay to the Administrative Agent, an unused commitment fee, payable quarterly, equal to 0.20% to 0.30% per annum of the average unused portion of available borrowings under the PNC Facility.

The PNC Facility is secured by assets held by GBDC 4 Funding and by the unfunded commitments of investors in the Company.

The description above is only a summary of the material provisions of the Agreement and is qualified in its entirety by reference to a copy of the Agreement, which is filed as Exhibit 10.1 to this current report on Form 8-K.

The information provided in Item 1.01 of this current report on Form 8-K is incorporated by reference into this Item 2.03.

* Exhibits and/or schedules to this Exhibit have been omitted in accordance with Item 60 of Regulation S-K. The registrant agrees to furnish supplementally a copy of all omitted exhibits and/or schedules to the SEC upon its request.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Golub Capital BDC 4, Inc. has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.