MBIA Inc., the bond insurer seeking reimbursement from Bank of America Corp. over faulty mortgages, surged the most in seven months after pledging to carry on a court fight to force the lender to repurchase the loans.

MBIA climbed 14 percent to $10.02 at 1:47 p.m. in New York, the biggest intraday advance since Jan. 3 and today’s second- best performance in the Russell 1000 Index. Shares of the Armonk, New York-based company had declined 24 percent this year through yesterday.

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