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): November 10, 2025


Ambac Financial 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.)


One World Trade Center	New York	NY	10007
(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

AMBC

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 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

On November 10, 2025, the Company filed with the Secretary of State of the State of Delaware a certificate of amendment to its certificate of incorporation, changing the Company’s name to “Octave Specialty Group, Inc.” (the “Name Change”). A copy of the Amended and Restated Certificate of Incorporation is filed as Exhibit 3.1 hereto, which is incorporated by reference into this Item 5.03. In connection with the Name Change, the bylaws of the Company were amended and restated in their entirety to reflect the Name Change. A copy of the Amended and Restated Bylaws is filed as Exhibit 3.2 hereto, which is incorporated by reference into this Item 5.03.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits. The following exhibits are filed as part of this Current Report on Form 8-K

EXHIBIT INDEX

Exhibit
Number

Exhibit Description

3.1

Amended and Restated Certificate of Incorporation of Octave Specialty Group, Inc.

3.2

Amended and Restated Bylaws of Octave Specialty Group, Inc.

99.1

Press Release dated November 10, 2025

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 hereunto duly authorized.

Ambac Financial Group, Inc.

(Registrant)

Dated:

November 10, 2025

By:

/s/ William J. White

William J. White

First Vice President, Secretary and
Assistant General Counsel

AMBAC FINANCIAL GROUP INC 8-K