Assured Guaranty Ltd., parent of one of the two monoline insurers with stable triple-A ratings, yesterday reported substantial growth in new business production in the fourth quarter of 2007 — a more than fourfold increase to $477 million over the same period a year earlier — as the company capitalized on its ratings to attract new financial guaranty business and reinsurance contracts.

The company preempted its regularly scheduled, fourth-quarter earnings announcement, set for Feb. 15, to report the numbers yesterday.

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