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


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*

                              ASSURED GUARANTY LTD.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 Par Value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    G0585R106
                                    ---------
                                 (CUSIP Number)

                                January 17, 2008
                                ----------------
                      (Date of Event which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [ ]      Rule 13d-1(b)
                  [X]      Rule 13d-1(c)
                  [ ]      Rule 13d-1(d)



  *The remainder of this cover page shall be filled out for a reporting person's
  initial filing on this form with respect to the subject class of securities,
  and for any subsequent amendment containing information which would alter the
  disclosures provided in a prior cover page.

  The information required on the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however, see
  the Notes).


                                  Page 1 of 11





-----------------------------                               --------------------
CUSIP No. G0585R106                        13G              Page 2 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Advisors, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a) [ ]
                                                                     (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          3,652,242 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            3,652,242 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,652,242 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           5.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 2 of 11





-----------------------------                               --------------------
CUSIP No. G0585R106                        13G              Page 3 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Management, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a) [ ]
                                                                     (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          3,652,242 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            3,652,242 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,652,242 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           5.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 3 of 11



-----------------------------                               --------------------
CUSIP No. G0585R106                        13G              Page 4 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           CR Intrinsic Investors, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a) [ ]
                                                                     (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          2,000,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,000,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,000,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           3.0% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 4 of 11



-----------------------------                               --------------------
CUSIP No. G0585R106                        13G              Page 5 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Canvas Capital Management, LP
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a) [ ]
                                                                     (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          342,400 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            342,400 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           342,400 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           0.5% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 5 of 11



-----------------------------                               --------------------
CUSIP No. G0585R106                        13G              Page 6 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Steven A. Cohen
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                     (a) [ ]
                                                                     (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          5,994,642 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            5,994,642 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           5,994,642 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

           [ ]
---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           8.9% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 6 of 11



Item 1(a)           Name of Issuer:
                    --------------

                    Assured Guaranty Ltd.

Item 1(b)           Address of Issuer's Principal Executive Offices:
                    -----------------------------------------------

                    30 Woodbourne Avenue, Hamilton HM 08, Bermuda

Items 2(a)          Name of Person Filing:
                    ---------------------

                    This statement is filed by: (i) S.A.C. Capital Advisors, LLC
                    ("SAC Capital Advisors") with respect to shares of common
                    stock, $0.01 par value ("Shares"), of the Issuer
                    beneficially owned by S.A.C. Capital Associates, LLC ("SAC
                    Capital Associates"), S.A.C. MultiQuant Fund, LLC ("SAC
                    MultiQuant Fund") and S.A.C. Select Fund, LLC ("SAC Select
                    Fund"); (ii) S.A.C. Capital Management, LLC ("SAC Capital
                    Management") with respect to Shares beneficially owned by
                    SAC Capital Associates, SAC MultiQuant Fund and SAC Select
                    Fund; (iii) CR Intrinsic Investors, LLC ("CR Intrinsic
                    Investors") with respect to Shares beneficially owned by CR
                    Intrinsic Investments, LLC ("CR Intrinsic Investments");
                    (iv) Canvas Capital Management, LP ("Canvas Capital
                    Management") with respect to Shares beneficially owned by
                    Canvas Capital Associates, LLC ("Canvas Capital
                    Associates"); and (v) Steven A. Cohen with respect to Shares
                    beneficially owned by SAC Capital Advisors, SAC Capital
                    Management, SAC Capital Associates, SAC MultiQuant Fund, SAC
                    Select Fund, CR Intrinsic Investors, CR Intrinsic
                    Investments, Canvas Capital Management and Canvas Capital
                    Associates.

                    SAC Capital Advisors, SAC Capital Management, CR Intrinsic
                    Investors, Canvas Capital Management and Steven A. Cohen
                    have entered into a Joint Filing Agreement, a copy of which
                    is filed with this Schedule 13G as Exhibit 99.1, pursuant to
                    which they have agreed to file this Schedule 13G jointly in
                    accordance with the provisions of Rule 13d-1(k) of the
                    Securities Exchange Act of 1934, as amended.

Item 2(b)           Address of Principal Business Office:
                    ------------------------------------

                    The address of the principal business office of (i) SAC
                    Capital Advisors, CR Intrinsic Investors and Mr. Cohen is 72
                    Cummings Point Road, Stamford, Connecticut 06902, (ii) SAC
                    Capital Management is 540 Madison Avenue, New York, New York
                    10022, and (iii) Canvas Capital Management is 101 California
                    Street, Suite 4225, San Francisco, California 94111.


                                  Page 7 of 11




Item 2(c)           Citizenship:
                    -----------

                    SAC Capital Advisors, SAC Capital Management and CR
                    Intrinsic Investors are Delaware limited liability
                    companies. Canvas Capital Management is a Delaware limited
                    partnership. Mr. Cohen is a United States citizen.

Item 2(d)           Title of Class of Securities:
                    ----------------------------

                    Common Stock, $0.01 par value per share

Item 2(e)           CUSIP Number:
                    ------------

                    G0585R106

Item 3              Not Applicable

Item 4              Ownership:
                    ---------

                    The percentages used herein are calculated based upon the
                    Shares issued and outstanding as of November 1, 2007 as
                    reported on the Issuer's quarterly report on Form 10-Q filed
                    with the Securities and Exchange Commission by the Issuer
                    for the quarterly period ended September 30, 2007.

                    As of the close of business on January 25, 2008:

                    1. S.A.C. Capital Advisors, LLC
                    (a)    Amount beneficially owned: 3,652,242
                    (b)    Percent of class: 5.4%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii)   Shared power to vote or direct the vote: 3,652,242
                    (iii)  Sole power to dispose or direct the disposition: -0-
                    (iv)   Shared power to dispose or direct the disposition:
                           3,652,242

                    2. S.A.C. Capital Management, LLC
                    (a)    Amount beneficially owned: 3,652,242
                    (b)    Percent of class: 5.4%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii)   Shared power to vote or direct the vote: 3,652,242
                    (iii)  Sole power to dispose or direct the disposition: -0-
                    (iv)   Shared power to dispose or direct the disposition:
                           3,652,242

                    3. CR Intrinsic Investors, LLC
                    (a)    Amount beneficially owned: 2,000,000
                    (b)    Percent of class: 3.0%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii)   Shared power to vote or direct the vote: 2,000,000
                    (iii)  Sole power to dispose or direct the disposition: -0-
                    (iv)   Shared power to dispose or direct the disposition:
                           2,000,000

                                  Page 8 of 11


                    4. Canvas Capital Management, LP
                    (a)    Amount beneficially owned: 342,400
                    (b)    Percent of class: 0.5%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii)   Shared power to vote or direct the vote: 342,400
                    (iii)  Sole power to dispose or direct the disposition: -0-
                    (iv)   Shared power to dispose or direct the disposition:
                           342,400

                    5. Steven A. Cohen
                    (a)    Amount beneficially owned: 5,994,642
                    (b)    Percent of class: 8.9%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii)   Shared power to vote or direct the vote: 5,994,642
                    (iii)  Sole power to dispose or direct the disposition: -0-
                    (iv)   Shared power to dispose or direct the disposition:
                           5,994,642

                    Pursuant to investment management agreements, each of SAC
                    Capital Advisors and SAC Capital Management share all
                    investment and voting power with respect to the securities
                    held by SAC Capital Associates, SAC MultiQuant Fund and SAC
                    Select Fund. Pursuant to an investment management agreement,
                    CR Intrinsic Investors maintains investment and voting power
                    with respect to the securities held by CR Intrinsic
                    Investments. Pursuant to Canvas Capital Associates'
                    operating agreement, Canvas Capital Management maintains
                    investment and voting power with respect to the securities
                    held by Canvas Capital Associates. Mr. Cohen controls each
                    of SAC Capital Advisors, SAC Capital Management, CR
                    Intrinsic Investors and Canvas Capital Management. CR
                    Intrinsic Investments is a wholly owned subsidiary of SAC
                    Capital Associates. By reason of the provisions of Rule
                    13d-3 of the Securities Exchange Act of 1934, as amended,
                    each of (i) SAC Capital Advisors, SAC Capital Management and
                    Mr. Cohen may be deemed to own beneficially 3,652,242 Shares
                    (representing approximately 5.4% of the Shares outstanding),
                    (ii) CR Intrinsic Investors and Mr. Cohen may be deemed to
                    own beneficially 2,000,000 Shares (representing
                    approximately 3.0% of the Shares outstanding) and (iii)
                    Canvas Capital Management and Mr. Cohen may be deemed to own
                    beneficially 342,400 Shares (representing approximately 0.5%
                    of the Shares outstanding). Each of SAC Capital Advisors,
                    SAC Capital Management, CR Intrinsic Investors, Canvas
                    Capital Management and Mr. Cohen disclaim beneficial
                    ownership of any of the securities covered by this
                    statement, and SAC Capital Associates disclaims beneficial
                    ownership of any securities held by CR Intrinsic
                    Investments.


                                  Page 9 of 11




Item 5              Ownership of Five Percent or Less of a Class:
                    --------------------------------------------

                    If this statement is being filed to report the fact that as
                    of the date hereof the reporting person has ceased to be the
                    beneficial owner of more than five percent of the class of
                    securities, check the following.   [ ]

Item 6              Ownership of More than Five Percent on Behalf of Another
                    --------------------------------------------------------
                    Person:
                    ------

                    Not Applicable

Item 7              Identification and Classification of the
                    ----------------------------------------
                    Subsidiary Which Acquired the Security Being
                    --------------------------------------------
                    Reported on By the Parent Holding Company:
                    -----------------------------------------

                    Not Applicable

Item 8              Identification and Classification of Members
                    --------------------------------------------
                    of the Group:
                    ------------

                    Not Applicable

Item 9              Notice of Dissolution of Group:
                    ------------------------------

                    Not Applicable

Item 10             Certification:
                    -------------

     By signing below the signatory certifies that, to the best of his knowledge
and belief, the securities referred to above were not acquired and are not held
for the purpose of or with the effect of changing or influencing the control of
the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose or
effect.


                                 Page 10 of 11




                                    SIGNATURE
                                    ---------

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated: January 28, 2008

S.A.C. CAPITAL ADVISORS, LLC


By:    /s/ Peter Nussbaum
       ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


S.A.C. CAPITAL MANAGEMENT, LLC


By:    /s/ Peter Nussbaum
       ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


CR INTRINSIC INVESTORS, LLC


By:    /s/ Peter Nussbaum
       ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


CANVAS CAPITAL MANAGEMENT, LP

By:    /s/ Peter Nussbaum
       ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person

STEVEN A. COHEN

By:    /s/ Peter Nussbaum
       ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person

                                 Page 11 of 11