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

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1 )

Assured Guaranty Ltd.
(Name of Issuer)

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

G0585R106
(CUSIP Number)

December 31, 2006
(Date of Event Which Requires Filing of this Statement)
 

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

[X]Rule 13d-1(b)
[]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 in 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).

CUSIP No. G0585R106
Person 1
 1. (a) Names of Reporting Persons.
Boston Partners Asset Management, L.L.C
  (b) Tax ID
04-3270538
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a) []
  (b) [X]
 3. SEC Use Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
 4. Citizenship or Place of Organization   Delaware
Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
5. Sole Voting Power  2,777,000
6.  Shared Voting Power 0
7. Sole Dispositive Power 2,777,000
8. Shared Dispositive Power 0

9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,777,000

 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

 11. Percent of Class Represented by Amount in Row (9)  3.8 %

 12. Type of Reporting Person (See Instructions)
IA

Item 1.
  (a) Name of Issuer
Assured Guaranty Ltd.
  (b) Address of Issuer's Principal Executive Offices
   30 Woodburne Avenue, Hamilton HM 08 Bermuda
Item 2.
 (a) Name of Person Filing
Boston Partners Asset Management, L.L.C
 (b) Address of Principal Business Office or, if none, Residence
28 State Street 20th floor Boston, MA 02109
  (c) Citizenship
Delaware
  (d) Title of Class of Securities
Common Stock $0.01 Par Value
  (e)CUSIP Number
G0585R106
 
Item 3. If this statement is filed pursuant to 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
 (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78c).
 (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
 (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
 (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
 (e) [X] An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E);
 (f) [] An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F);
 (g) [] A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G);
 (h) [] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
 (i) [] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
 (j) [] Group, in accordance with 240.13d-1(b)(1)(ii)(J).
 
Item 4.Ownership.
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
 (a) Amount beneficially owned:  2,777,000
 (b) Percent of class:  3.8%
 (c)Number of shares as to which the person has:
  (i) Sole power to vote or to direct the vote 2,777,000
 (ii) Shared power to vote or to direct the vote  0
   (iii) Sole power to dispose or to direct the disposition of 2,777,000
  (iv) Shared power to dispose or to direct the disposition of 0
 
Person 2
 1. (a) Names of Reporting Persons.
Weiss, Peck & Greer Investments, a division of Robeco USA, L.L.C.
  (b) Tax ID
13-2649199
  2. Check the Appropriate Box if a Member of a Group (See Instructions)
    (a) []
  (b) [X]
 3. SEC Use Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
 4. Citizenship or Place of Organization   Delaware
Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
5. Sole Voting Power  0
6.  Shared Voting Power 208,380
7. Sole Dispositive Power 0
8. Shared Dispositive Power 208,380

9. Aggregate Amount Beneficially Owned by Each Reporting Person 208,380

 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

 11. Percent of Class Represented by Amount in Row (9)  0.28 %

 12. Type of Reporting Person (See Instructions)
IA

Item 1.
  (a) Name of Issuer
Assured Guaranty Ltd.
  (b) Address of Issuer's Principal Executive Offices
   30 Woodburne Avenue, Hamilton HM 08 Bermuda
Item 2.
 (a) Name of Person Filing
Weiss, Peck & Greer Investments, a division of Robeco USA, L.L.C.
 (b) Address of Principal Business Office or, if none, Residence
909 Third Avenue, New York, NY 10022
  (c) Citizenship
Delaware
  (d) Title of Class of Securities
Common Stock $0.01 Par Value
  (e)CUSIP Number
G0585R106
 
Item 3. If this statement is filed pursuant to 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
 (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78c).
 (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
 (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
 (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
 (e) [X] An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E);
 (f) [] An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F);
 (g) [] A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G);
 (h) [] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
 (i) [] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
 (j) [] Group, in accordance with 240.13d-1(b)(1)(ii)(J).
 
Item 4.Ownership.
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
 (a) Amount beneficially owned:  208,380
 (b) Percent of class:  0.28%
 (c)Number of shares as to which the person has:
  (i) Sole power to vote or to direct the vote 0
 (ii) Shared power to vote or to direct the vote  208,380
   (iii) Sole power to dispose or to direct the disposition of 0
  (iv) Shared power to dispose or to direct the disposition of 208,380
 
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.[X ].
 
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 or Control Person.
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 I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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.

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.

January 31, 2007
Date
Mary Ann Iudice
Signature
Chief Compliance Officer
Name/Title

 

 

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations
(See 18 U.S.C. 1001)

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