Actavis Purchase Of Allergan Makes It A "$100 Billion Merger Monday" By: TalkMarkets November 17, 2014 at 12:46 PM EST Actavis will acquire Allergan for a combination of $129.22 in cash and 0.3683 Actavis shares for each share of Allergan common stock. Read More >> Related Stocks: Actavis Plc