Assured Guaranty Ltd. posted record profits in 2009 as its fourth-quarter earnings handily beat estimates.

More than 98% of primary market insurance last year was written by ­Assured Guaranty Corp. or ­Assured Guaranty Municipal Corp., the ­company’s two insurance subsidiaries. That dominance allowed the company to post annual net income of $97.2 million, versus $68.9 million in 2008, a 41% increase, according to the company’s year-end financial supplement.

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