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0000874501FALSE00008745012026-02-232026-02-23

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM8-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)
Delaware1-1077713-3621676
(State of incorporation)(Commission
file number)		(I.R.S. employer
identification no.)
40 Wall StreetNew YorkNY10005
(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 classTrading SymbolName of each exchange on which registered
Common stock, par value $0.01 per shareOSGNew 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
NumberExhibit Description
99.1Press Release dated November 10, 2025
EXHIBIT INDEX
Exhibit
NumberExhibit Description
99.1
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, 2026By:/s/ William J. White
William J. White
First Vice President, Secretary and Assistant General Counsel
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