What happened to Ambac today? Anyone know?

Ambac was up 40%+ on huge volume today:

Admittedly it's just a penny-stock and volume represents a meagre $50 million but still...Huge move with no news. MBIA was up a bit too. Mortgage insurers (PMI, RDN, etc) had been rallying big time for the last few days as well... could be short-covering but hard to say.


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