Amgen Inc.'s shares ( NASDAQ:AMGN ) rose by 15.9% when the market opened on Friday, marking its biggest intraday rise since July 2009. The company has emerged as a potential competitor to Eli Lilly & Co. and Novo Nordisk A/S, which currently dominate the weight-loss market. Demand for anti-obesity drugs like Zepbound and Wegovy is so strong that Intelligence's...