The cream rose further to the top of the financial guaranty business Friday, as Assured Guaranty Ltd. announced a potential $1 billion capital infusion from Wilbur Ross, and Berkshire Hathaway Assurance Corp. was approved to do business in the state of Maryland.

MBIA Inc., parent of MBIA Insurance Corp., meanwhile, said it would suffer additional mark-to-market losses related to residential mortgage-backed securities.

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