6.40% Junior Subordinated Debenture (AGUS) Floating Rate

Security

Assured Guaranty US Holdings Inc. $150MM Series A Enhanced Junior Subordinated Debentures due 2066

CUSIP:  04622DAA9

Ticker:  N/A

Corporate issuer:  Assured Guaranty US Holdings Inc.

Guaranteed by:  Assured Guaranty Ltd. (on a junior subordinated basis)

Par/denomination:  $1000

Coupon or dividend rate:  

                       quarterly reset floating rate of 3 month LIBOR plus 2.38% (previously 6.40% per annum until 12/15/2016)

Coupon or dividend record date:  close of business on the business day preceding interest payment date (June 14 and Dec 14 for 2011)

                       payable date:  June 15 and Dec 15

                       ex-date (if any):  N/A

Issue date:  12/20/2006

Maturity:  12/15/2066

Call date/terms:  Redeemable prior to December 15, 2016 in whole but not in part, subject to “make-whole” provision; redeemable after December 15, 2016 in whole or in part. See prospectus for details.

Prospectus (pdf)

Please note information in the prospectus or prospectus supplement is current only as of the date of the document; for more current information, please see Financial Information for Assured Guaranty Ltd. and AGM or AGC, as applicable, and Assured Guaranty’s filings with the Securities and Exchange Commission.