Carl Icahn takes ‘large’ stake in Allergan By: MarketWatch May 31, 2016 at 10:56 AM EDT Billionaire investor Carl Icahn said he has taken a “large” stake in Allergan PLC, and threw his support behing the drug maker’s chief executive, Brent Saunders. Read More >> Related Stocks: Allergan Plc Macy's Pfizer