Mega deals morph into mega problems for Wall Street

Mega deals morph into mega problems for Wall Street

Traders work at the post where Allergan stock is traded on the floor of the New York Stock Exchange (NYSE) April 6, 2016. REUTERS/Brendan McDermid

If 2015 was a dream year for Wall Streets top dealmakers, 2016 is starting to take a nightmarish turn.

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