The New York Stock Exchange has given Ambac Financial Group Inc. 10 days to respond to a notice issued late Wednesday warning the bond insurer it could be delisted for failing to maintain a minimum share value of $1.00 for the 30 trading days ending Dec. 8.

Ambac is the holding company of Ambac Assurance Corp., a former industry titan that has not written new insurance since June 2008 but maintains one of the largest municipal portfolios in the business.

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