AIG Mortgage Insurer Upgraded by S&P on Underwriting, Prices

American International Group Inc.’s mortgage insurer was upgraded by Standard & Poor’s, which cited better underwriting and the higher rates the unit has been charging for coverage since 2009.

“We believe that operating results will improve,” the ratings company said today in a statement on New York-based AIG’s United Guaranty, lifting the rating to BBB+ from BBB.

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