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)—March 21, 2012

ASSURED GUARANTY LTD.
(Exact name of registrant as specified in its charter)

Assured Guaranty Ltd.
30 Woodbourne Avenue
Hamilton HM 08 Bermuda
(Address of principal executive offices)

Registrant's telephone number, including area code: (441) 279-5700

Not applicable
(Former name or former address, if changed since last report)

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 (see General Instruction A.2. below):

o

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01    Other Events

        Assured Guaranty Ltd. is filing this Current Report on Form 8-K to supplement its Annual Report on Form 10-K for the period ended December 31, 2011 with the Assured Guaranty Corp. December 31, 2011 Consolidated Financial Statements, which are attached as Exhibit 99.1 and incorporated by reference herein.

Item 9.01    Financial Statements and Exhibits.

(d)

Exhibits

2

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 thereunto duly authorized.

DATE: March 21, 2012

3

EXHIBIT INDEX

4

QuickLinks

Item 8.01 Other Events
Item 9.01 Financial Statements and Exhibits.