By WACHTELL, LIPTON, ROSEN & KATZ and KING & WOOD MALLESONS

Global M&A volume in 2015 exceeded $5 trillion, an all-time high. Booms inevitably raise questions about their sustainability, and it remains to be seen how long this one will last, but as of this writing M&A shows no signs of slowing.

Last year’s volume exceeded 2014’s by $1.4 trillion, as well as the prior 2007 record. One-third of the 2015 volume represented cross-border deals, approximately 40% of which ($637 billion) involved U.S. companies. Incoming deals to the United States were valued at $433 billion, also an all-time high.

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