Here's Why Merck, Eli Lilly, and Novo Nordisk Stocks Rose 11% Last Month

January was a big month for pharmaceutical stocks, with Merck (MRK -0.68%), Eli Lilly (LLY 1.42%), and Novo Nordisk (NVO -0.23%) all climbing 11%, according to data provided by S&P Global Market Intelligence. Investors are excited about the potential market for weight-loss drugs, and that attention has driven momentum for some of the larger pharma stocks.There wasn't much major news from these companies in January, but there was enough positive buzz to build on the existing momentum ahead of quarterly-earni ...