UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, ~~D.C.~~DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of ~~Report~~report (Date of earliest event reported): ~~September~~ 26October 7, 2025

GOLUB CAPITAL BDC, INC.

(Exact name of Registrant as ~~specified~~Specified in ~~its charter~~Its Charter)

Delaware

~~814-00794~~

~~27-2326940~~

814-00794

27-2326940

(State or other jurisdiction of incorporation)

(Commission File Number)

(I.R.S. Employer Identification No.)

(State or Other Jurisdictionof Incorporation)

(Commission File Number)

(IRS EmployerIdentification No.)

__ 200 Park Avenue, 25th Floor, New York, NY ~~10166~~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)~~____ ____

(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):

¨☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨☐ Pre-commencement ~~communions~~communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class		~~Trading Symbol (s)~~	Trading Symbol	~~Name of each exchange on which registered~~		Name of each exchange on which registered
Common Stock, par value $0.001 per share		~~GBDC~~	GBDC	~~The Nasdaq Global Select Market~~		The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b–- 2 of the Securities Exchange Act of 1934.

¨ Emerging growth company ☐

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. ¨o

Item 2.0302. Results ~~Creation~~ of aOperations ~~Direct~~and Financial ~~Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant~~Condition.

On ~~September~~ 26October 7, 2025, Golub Capital BDC, Inc. ~~(the “Company”)~~ issued ana ~~additional~~press ~~$250.0~~release ~~million~~announcing inthat ~~aggregate~~it ~~principal~~will ~~amount of~~release its ~~7.050%~~financial ~~Notes~~results ~~due~~for ~~2028 (~~the ~~“New~~quarter ~~Notes”~~ and the ~~issuance~~year ~~and~~ended ~~sale of the New Notes~~September 30, ~~the~~2025 ~~“Offering”).~~on ~~The New Notes were issued as additional notes under the base indenture~~Tuesday, ~~dated October 2~~November 18, ~~2020~~2025 ~~(the~~after ~~“Base Indenture”), by and between~~ the ~~Company~~close ~~and~~of ~~U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee (~~the ~~“Trustee”),~~financial as supplemented by the Fourth Supplemental Indenture, dated December 5, 2023 (the “Fourth Supplemental Indenture” and together with the Base Indenture, the “Indenture”), pursuant to which the Company initially issued $450markets.~~0 million~~ inA ~~aggregate~~copy ~~principal amount~~ of ~~the~~this ~~7.050%~~press ~~Notes~~release ~~due~~is ~~2028~~attached ~~(the~~hereto ~~“Existing~~as ~~Notes”~~Exhibit ~~and together with the New Notes, the “Notes”) on December 5, 2023~~99.1.

The ~~New~~ ~~Notes~~information ~~are~~in ~~treated~~Item as2.02 aof ~~single~~this ~~series~~Current ~~with~~Report ~~the~~on ~~Existing~~Form ~~Notes~~8-K, ~~under~~including ~~the~~Exhibit ~~Indenture~~99.1 furnished herewith, is being furnished and ~~have~~shall ~~the~~not ~~same~~be ~~terms~~deemed as“filed” for any purpose of Section 18 of the ~~Existing~~Securities ~~Notes~~Exchange Act of 1934, as amended (~~except~~ the ~~issue~~“Exchange ~~date~~Act”), ~~the~~or ~~offering~~otherwise ~~price~~subject ~~and~~to the ~~initial~~liabilities ~~interest~~of ~~payment~~such ~~date)~~Section. The ~~New~~information ~~Notes~~in ~~have~~this ~~the~~Current ~~same~~Report ~~CUSIP~~on ~~number~~Form ~~and~~8-K ~~are~~shall ~~fungible~~not ~~and rank~~be ~~equally~~deemed ~~with~~to ~~the~~be ~~Existing~~incorporated ~~Notes.~~by ~~Upon~~reference ~~issuance~~into ofany filing under the ~~New~~Securities ~~Notes~~Act of 1933, as amended, or the ~~outstanding~~Exchange ~~aggregate~~Act, ~~principal~~except ~~amount~~as ofshall ~~the~~be ~~Company’s 7.050%~~expressly ~~Notes~~set ~~due~~forth ~~2028~~by isspecific ~~$700.0~~reference ~~million~~in such filing.

The Notes mature on December 5, 2028, unless previously redeemed or repurchased in accordance with their terms. The Notes bear interest at a rate of 7.050% per year payable semi-annually in arrears on June 5 and December 5 of each year, commencing on December 5, 2025 for the New Notes. The Notes are the Company’s general unsecured obligations that rank senior in right of payment to all of the Company’s future indebtedness or other obligations that are expressly subordinated, or junior, in right of payment to the Notes; equal in right of payment to the Company’s existing and future indebtedness or other obligations that are not so subordinated or junior; effectively junior to any of the Company’s secured indebtedness or other obligations (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness; and structurally junior to all existing and future indebtedness and other obligations (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.

Prior to November 5, 2028 (one month prior to the maturity date of the Notes) (the “Par Call Date”), the Company may redeem the Notes at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (1) 100% of the principal amount of the Notes to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date, or (2) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Notes matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate (as defined in the Fourth Supplemental Indenture) plus 45 basis points less (b) interest accrued to the date of redemption. On or after the Par Call Date, the Company may redeem the Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest thereon to the redemption date. No sinking fund is provided for the Notes. In addition, if a Change of Control Repurchase Event (as defined in the Fourth Supplemental Indenture) occurs in respect of the Company prior to maturity, holders of the Notes may require the Company to repurchase for cash some or all of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but not including, the repurchase date.

The Indenture contains certain covenants, including a covenant requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act of 1940, as amended, or any successor provisions, but giving effect to any exemptive relief granted to the Company by the Securities and Exchange Commission (the “SEC”), and to provide financial information to the holders of the Notes and the Trustee if the Company should no longer be subject to the reporting requirements under the Securities Exchange Act of 1934, as amended. These covenants are subject to important limitations and exceptions that are set forth in the Indenture.

The Company intends to use the net proceeds of the Offering to repay a portion of the outstanding indebtedness under the Company’s senior secured revolving credit facility with JPMorgan Chase Bank, N.A. (the “JPM Credit Facility”). However, the Company may re-borrow under the JPM Credit Facility or borrow under the Company’s line of credit with GC Advisors LLC for general corporate purposes, which may include investing in portfolio companies in accordance with the Company’s investment strategy.

The Offering was made pursuant to the Company’s effective shelf registration statement on Form N-2 (File No. 333-286240) previously filed with the SEC, as supplemented by a preliminary prospectus supplement dated September 19, 2025, the pricing term sheet filed with the SEC on September 19, 2025, and a final prospectus supplement dated September 19, 2025. This Current Report on Form 8-K shall not constitute an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction. The transaction closed on September 26, 2025.

The description above is only a summary of the material provisions of the Base Indenture, the Fourth Supplemental Indenture, and the Notes and is qualified in its entirety by reference to copies of the Base Indenture, the Fourth Supplemental Indenture, and the form of global note representing the Notes, respectively, which are incorporated by reference herein.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

EXHIBIT NUMBER		DESCRIPTION
4.1		Indenture, dated as of October 2, 2020, by and between Golub Capital BDC, Inc. and U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to Current Report on Form 8-K filed on October 2, 2020)
4.2		Fourth Supplemental Indenture, dated as of December 5, 2023, relating to the 7.050% Notes due 2028, by and between Golub Capital BDC, Inc. and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed on December 5, 2023)
4.3		Form of Global Note with respect to 7.050% Notes due 2028 (included in Exhibit 4.2 to the Current Report on Form 8-K filed on December 5, 2023 and incorporated by reference herein)
5.1		Opinion of Eversheds Sutherland (US) LLP
23.1		Consent of Eversheds Sutherland (US) LLP (contained in the opinion filed as Exhibit 5.1 hereto)
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

99.1 Press release of Golub Capital BDC, Inc., dated as of October 7, 2025

~~SIGNATURE~~104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

	Golub Capital BDC, Inc.
			GOLUB CAPITAL BDC, INC.
Date: September 26, 2025	By:	/s/ Christopher C. Ericson
Date: October 7, 2025			By: /s/ Christopher C. Ericson
		Christopher C. Ericson
			Name: Christopher C. Ericson
		Chief Financial Officer and Treasurer
			Title: Chief Financial Officer

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