Alexion to buy Portola Pharmaceuticals in $1.41 bln deal By: Reuters: Company News May 05, 2020 at 07:14 AM EDT Alexion Pharmaceuticals Inc. on Tuesday agreed to buy Portola Pharmaceuticals Inc in a deal that values the U.S. drug developer at $1.41 billion. Read More >> Related Stocks: Alexion Pharmaceuticals Portola Pharma