Gladstone Capital (GLAD) 8-KEntry into a Material Definitive Agreement

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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 ☐

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The Notes will mature on September 1, 2028, unless previously redeemed or repurchased in accordance with their terms. The interest rate of the Notes is 7.75% per year, and interest on the Notes will be paid on March 1, June 1, September 1 and December 1 of each year, beginning on December 1, 2023. The Notes are the Company’s direct unsecured obligations and rank pari passu with the Company’s existing and future unsecured, unsubordinated indebtedness, including its 3.75% Notes due 2027 and 5.125% Notes due 2026; senior to the Company’s 6.25% Series A Cumulative Redeemable Preferred Stock and any series of preferred stock that the Company may issue in the future; senior to any of the Company’s future indebtedness that expressly provides it is subordinated to the Notes; effectively subordinated to any future secured indebtedness of the Company (including indebtedness that is initially unsecured to which the Company subsequently grants security), to the extent of the value of the assets securing such indebtedness; and structurally subordinated to all existing and future indebtedness and other obligations of any of the Company’s existing or future subsidiaries, including, without limitation, borrowings under the Company’s credit facility.

The Notes may be redeemed in whole or in part at any time or from time to time at the Company’s option on or after September 1, 2025, upon not less than 30 days nor more than 60 days written notice by mail prior to the date fixed for redemption thereof, at a redemption price of 100% of the outstanding principal amount of the Notes to be redeemed plus accrued and unpaid interest payments otherwise payable for the then-current quarterly interest period accrued to, but not including, the date fixed for redemption.

The Indenture contains certain covenants, including covenants requiring the Company to comply with Section 18(a)(1)(A) as modified by Section 61(a)(2) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), or any successor provisions, to comply with Section 18(a)(1)(B) as modified by Section 61(a)(2) of the Investment Company Act, or any successor provisions but giving effect to anyrelief granted by the Securities and Exchange Commission (the “SEC”) to another business development company and upon which the Company may reasonably rely (or to the Company if the Company determines to seek such similaror other relief), and to provide certain 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 Notes were offered and sold pursuant to the Company’s effective shelf registration statement on Form(Registrationpreviously filed with the SEC, as supplemented by a preliminary prospectus supplement dated August 10, 2023, the pricing term sheet dated August 10, 2023 and a final prospectus supplement dated August 10, 2023. This Current Report on Formshall 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 August 17, 2023.

The Company intends to use the net proceeds from the offering to repay a portion of the amount outstanding under its credit facility, to fund new investment opportunities and for other general corporate purposes. The Companycredit facility to make investments in portfolio companies in accordance with its investment objectives depending on the availability of appropriate investment opportunities consistent with its investment objectives.

The description above is only a summary of the material provisions of the Fifth Supplemental Indenture and the Notes and is qualified in its entirety by reference to copies of the Fifth Supplemental Indenture and the Notes, respectively, each filed as exhibits to this Current Reportby reference herein.

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