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Wall Street Dealmaking Goes From Boom to Bust in Few Months

  • The value of canceled deals soar as regulators get tough
  • Companies have pushed the envelope in deal size, analyst says
New York Stock Exchange
Photographer: Michael Nagle/Bloomberg
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Wall Street bankers celebrated last year as mergers and acquisitions reached the highest level ever, topping even pre-crash 2007. This year M&A is hitting a more dubious record: Deals gone bust.

Of the $5 trillion in transactions that were announced in 2015, almost 10 percent -- $504 billion -- have since been terminated. Wednesday was especially bad for bankers as two mergers valued at a combined $21 billion collapsed.