Merck (MRK) Stock News Today: Why Shares Slid on Dec. 16, 2025 as Analysts Reassess Keytruda, Winrevair, and Merck’s Post‑Patent Strategy
Merck & Co., Inc. (NYSE: MRK) stock was among the biggest drags on the Dow Jones Industrial Average in Tuesday’s session (December 16, 2025), with shares trading lower as investors weighed broad market pressure alongside a fast-moving set of company-specific