UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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): ~~September~~November 1517, 2025

Gladstone Capital Corporation

(Exact Name of Registrant as Specified in Charter)

Maryland

814-00237

54-2040781

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification Number)

1521 Westbranch Drive, Suite 100

McLean, Virginia

22102

(Address of Principal Executive Offices)

(Zip Code)

(703) 287-5800

(Registrant’s telephone number, including area code)

(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:

☐

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 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~~Tradingsymbol	Name of each ~~exchange~~exchangeon on which registered
Common Stock, $0.001 par value per share	GLAD	The Nasdaq Stock Market LLC
7.75% Notes due 2028, $25.00 par value per note	GLADZ	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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. ☐

Item 8 2.0102 ~~Other~~Results ~~Events.~~of Operations and Financial Condition.

On ~~September~~November 1517, 2025, Gladstone Capital Corporation ~~(the~~issued ~~“Company”)~~a ~~announced~~press ~~that~~release itannouncing ~~will redeem 100% (or $150,000,000 aggregate principal amount) of~~ its ~~outstanding~~financial ~~5.125%~~results ~~Notes~~for ~~due~~the ~~2026~~fiscal ~~(the~~quarter ~~“2026~~and ~~Notes”)~~year onended ~~October~~September 3130, 2025. ~~and~~The ~~100%~~text ~~(or~~of ~~$57,000,000~~the ~~aggregate~~press ~~principal~~release ~~amount)~~is ofincluded ~~its~~as ~~outstanding~~an ~~7.75%~~exhibit ~~notes~~to ~~due~~this ~~2028~~Current ~~(the~~Report ~~“2028 Notes”)~~ on ~~October 15,~~Form ~~2025 (each, a “Redemption Date”)~~8-K. The ~~redemption~~information ~~price~~in ~~for~~this ~~the~~Current ~~2026~~Report ~~Notes~~on ~~equals~~Form ~~100% of the $150~~8-K,~~000,000~~ ~~aggregate~~including ~~principal~~Exhibit ~~amount~~99.1 ofattached ~~the~~hereto, ~~2026~~is ~~Notes~~ being ~~redeemed~~furnished ~~plus accrued~~ and ~~unpaid~~shall ~~interest,~~not ifbe ~~any,~~deemed ~~to,~~“filed” ~~but~~for ~~excluding,~~purposes ~~the~~of ~~applicable~~Section 18 ~~Redemption~~of ~~Date. The redemption price for~~ the ~~2028~~Securities ~~Notes~~Exchange ~~equals~~Act ~~100%~~ of ~~the $57~~1934,~~000,000~~ ~~aggregate~~as ~~principal~~amended ~~amount of~~ (the ~~2028~~“Exchange ~~Notes being redeemed~~Act”), ~~plus~~or ~~accrued~~incorporated ~~and~~by ~~unpaid~~reference ~~interest~~in ~~otherwise~~any ~~payable~~filing ~~for~~under the ~~then-current~~Securities ~~quarterly~~Act ~~interest~~of ~~period accrued to~~1933, ~~but~~as ~~excluding~~amended, ~~the~~or ~~applicable Redemption Date. In connection with~~ the ~~redemption~~Exchange Act, ~~the~~regardless ~~2028~~of ~~Notes~~any ~~will~~general beincorporation ~~delisted~~language ~~from~~in ~~the~~such ~~Nasdaq Global Select Market~~filing.

Item 9.01.

Financial Statements and Exhibits.

(d)

Exhibits.


Exhibit No.		Description

99.1		Press Release of Gladstone Capital Corporation, dated November 17, 2025.

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

SIGNATURE

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

	Gladstone Capital Corporation
	(Registrant)
Date: November 17, 2025	By:	/s/ Nicole Schaltenbrand
September 15, 2025	By:	/s/ Nicole Schaltenbrand
		Nicole Schaltenbrand
		Chief Financial Officer and Treasurer
		Chief Financial Officer & Treasurer

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