The 7 Firms Behind The Mammoth Pfizer-Allergan Merger

Law360, New York (November 23, 2015, 8:33 PM EST) -- Pfizer and Allergan tapped seven law firms to help guide their $160 billion merger, including Wachtell Lipton Rosen & Katz LLP and Cleary Gottlieb Steen & Hamilton LLP, respectively, drawing on relationships with trusted partners from prior transactions and channeling those firms' experience with megamergers that require a host of attorneys to work together, experts say.

The two drugmakers selected additional law firms to handle certain separate aspects of the deal, with Wachtell Lipton acting as Pfizer Inc.'s lead counsel, Skadden Arps Slate Meagher & Flom...
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