The New York Stock Exchange once again notified Ambac Financial Group that it could be de-listed for failing to maintain a minimum share value of $1.00 for a 30-day period, the company announced Tuesday.

Ambac is the holding company of Ambac Assurance Corp., a former leader in the municipal bond insurance industry that has not written new policies since June 2008. The parent company has been warning since November that it may face bankruptcy as early as 2011.

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