Standard & Poor's Friday downgraded Radian Group Inc. to BB from BB-plus, while taking no action on its operating subsidiaries Radian Guaranty Inc. and Radian Asset Assurance Inc.

Both the mortgage and bond insurance companies - rated BBB-plus - remain on review for downgrade. The downgrade to Radian Group came as Standard & Poor's took action on a number of mortgage-insurance holding companies, and in some cases the operating companies themselves.

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