Alexion Pharmaceuticals Inc., of Boston, will diversify its portfolio beyond its top-selling Soliris (eculizumab) and C5 inhibitor Ultomiris (ravulizumab) by acquiring Portola Pharmaceuticals Inc. for $1.4 billion. Alexion’s CEO, Ludwig Hantson, told investors May 5 that the acquisition immediately diversifies the company’s commercial-stage portfolio by adding Portola’s Andexxa (coagulation factor Xa [recombinant], inactivated-zhzo) to Alexion’s existing palette of hematology and neurology therapies. Alexion’s CEO, Ludwig Hantson, told investors May 5 that the acquisition immediately diversifies the company’s commercial-stage portfolio by adding Portola’s Andexxa (coagulation factor Xa [recombinant], inactivated-zhzo) to Alexion’s existing palette of hematology and neurology therapies. Andexxa is the only FDA-approved factor Xa inhibitor reversal agent in severe and uncontrolled bleeding.