Despite a downgrade by Moody's Investors Service in November, Assured Guaranty Corp. took the top spot in bond insurer rankings in the fourth quarter.

Berkshire Hathaway Assurance Co. was number two and Financial Security Assurance Inc. was the third-ranked insurer in the quarter. But FSA, which Assured Guaranty Ltd. has agreed to acquire, retained its number one position for all of 2008.

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