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FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
DEROSA PAUL R

(Last)(First)(Middle)
AMBAC FINANCIAL GROUP, INC., ONE STATE STREET PLAZA

(Street)
NEW YORKNY10004

(City)(State)(Zip)
2. Issuer Name and Ticker or Trading Symbol
AMBAC FINANCIAL GROUP INC [ABK]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2009
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock         78,488 D  

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Phantom Stock Units (1) 10/01/2009 A  17,000   (2) (2) Common Stock 17,000 $ 1.5 78,887 D  
Explanation of Responses:
1. Each Phantom Stock Unit converts to common stock on a one to one basis.
2. These Phantom Stock Units ("PSUs") were acquired under the Issuer's Deferred Compensation Plan and represent 25% of the Reporting Person's Annual Retainer Fees for serving as a director and 100% of his Meeting Fees earned during the third quarter of 2009. These PSUs are to be settled 100% in cash upon the Reporting Person's retirement or resignation from the Issuer's Board of Directors or on an earlier date previously selected by the Reporting Person.
Patricia LoCascio, Attorney in Fact for Paul DeRosa10/05/2009
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

POWER OF ATTORNEY

I, Paul DeRosa, do hereby nominate, constitute and appoint each 
of Anne Gill Kelly, Kevin J. Doyle, Marianna Blanch, 
Stacey B. Spain and Patricia Lo Cascio, as my true and lawful 
agent and attorney-in-fact, with full power and authority to act 
hereunder, in his or her discretion, in my 
name and on my behalf as fully as I could if I were present and acting 
in person, to make any and all required or voluntary filings under 
Section 16(a) of the Securities Exchange Act of 1934,as amended (the 
"Exchange Act"), and the applicable rules and regulations
thereunder, with the Securities and Exchange Commission, the New York 
Stock Exchange, Ambac Financial Group, Inc., a Delaware corporation 
(the "Company"), and any other person or entity to which such filings 
may be required under Section 16(a) of the Exchange Act as a result of
my service as an officer of the Company or beneficial ownership 
(within the meaning of Section 16(a) of the Exchange Act) of more than 
ten percent of any class of equity securities 
of the Company.  

I hereby consent to, ratify and confirm all that each said attorney-in-fact 
shall do or cause to be done by virtue of this Power of Attorney.  I hereby
acknowledge that each attorney-in-fact, in serving in such capacity at my 
request, is not assuming, nor is the Company assuming, any of my 
responsibilities to comply with Section 16 of the Exchange Act.  

This Power of Attorney shall remain in full force and effect from this 
date forward for so long as I am an officer or director of the Company 
and for such time thereafter as may be necessary to make any such filings 
or until revoked or modified by me.  I hereby revoke all prior powers of
attorney relating to the foregoing acts.  

IN WITNESS WHEREOF, I have hereunto signed my name this 30th day of 
June 2008.

/s/ Paul DeRosa
PAUL DEROSA

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