 HAMILTON, Bermuda--BUSINESS WIRE--Assured Guaranty Ltd. NYSE:AGO announced today that SP Global Ratings SP has affirmed the AA financial strength ratings on U.S. bond insurers Assured Guaranty Municipal Corp. AGM and Assured Guaranty Corp. AGC; U.K. financial guarantor Assured Guaranty UK Limited AGUK and European financial guarantor Assured Guaranty Europe SA AGE; and Bermuda insurers Assured Guaranty Re Ltd. AGRe and Assured Guaranty Re Overseas Ltd. AGRO. The ou 