The 10 largest M&A deals of all time

Pfizer deal becomes third largest

Where does Pfizer's $160bn acquisition of Allergan rank in the top ten?

November 2015 update: The latest mega-merger between healthcare giant Pfizer and Allergan has shaken up the industry, creating the largest drugmaker in the world. The merger has become the third largest acquisition in financial history, and has reshaped the list of the 10 largest M&A deals of all time.  Below is the updated top ten: 1. Vodafone AirTouch's acquisition of Mannesmann AG for $203bn in 1999. (Vodafone was re-branded Vodafone Airtouch in early 1999 after it bought AirTouch Communications. It then reverted to its former name Vodafone Group in 2001). Vodafone Airtouch p...