Pfizer Files Federal Antitrust Claims in Second Lawsuit Against Metsera, its Controlling Stockholders and Novo Nordisk Share NEW YORK--(BUSINESS WIRE)--Pfizer Inc. today announced that it has filed a second lawsuit against Metsera, Inc., its controlling stockholders, and Novo Nordisk A/S in the United States District Court for the District of Delaware. The lawsuit asserts that Novo Nordisk's recent proposal to acquire Metsera constitutes an anticompetitive action by Novo Nordisk to protect its dominant mark ...