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): February 23, 2026


Octave Specialty Group, Inc.
(Exact name of Registrant as specified in its charter)

Delaware

1-10777

13-3621676

(State of incorporation)

(Commission
file number)

(I.R.S. employer
identification no.)


40 Wall Street	New York	NY	10005
(Address of principal executive offices)


	(212)	658-7470
(Registrant's telephone number, including area code)

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-4c))

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

Title of each class

Trading Symbol

Name of each exchange on which registered

Common stock, par value $0.01 per share

OSG

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 under the Securities Act (17 CFR 230.405) or Rule 12b-2 under the Exchange Act (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 2.02 Results of Operations and Financial Condition.

On February 23, 2026, Octave Specialty Group, Inc. issued a press release announcing financial results for its fourth quarter ended December 31, 2025. Exhibit 99.1 is a copy of such press release and is incorporated by reference.

The information furnished pursuant to this Item 2.02, including Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of Ambac Financial Group, Inc. under the Securities Act of 1933 or the Exchange Act.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits


Exhibit
Number						Exhibit Description
99.1						Press Release dated November 10, 2025

EXHIBIT INDEX


Exhibit
Number						Exhibit Description
99.1						Press Release dated February 23, 2026
101.INS						XBRL Instance Document - the instance document does not appear in the interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH						XBRL Taxonomy Extension Schema Document.
101.CAL						XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB						XBRL Taxonomy Extension Label Linkbase Document.
101.PRE						XBRL Taxonomy Extension Presentation Linkbase Document.
101.DEF						XBRL Taxonomy Extension Definition Linkbase Document.
104						Cover Page Interactive Data File - The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags or embedded within the Inline XBRL document

SIGNATURES

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 thereunto duly authorized.

Ambac Financial Group, Inc.

(Registrant)

Dated:

February 23, 2026

By:

/s/ William J. White

William J. White

First Vice President, Secretary and Assistant General Counsel

OCTAVE SPECIALTY GROUP INC 8-K