Merck (MRK) Stock After Hours Today: Shares Hit a New 52-Week High on Dec. 24, 2025 — What to Know Before U.S. Markets Reopen
NEW YORK — December 24, 2025: Merck & Co., Inc. (NYSE: MRK) ended a holiday-shortened Christmas Eve session near $106.45, up about 1.3% on the day, and held close to those levels in thin after-hours trading. MarketBeat The move capped a strong late-December run for the pharmaceutical blue chip and came as the broader U.S. market pushed to fresh records in a “Santa rally” setup—an upbeat backdrop that helped lift several Dow components, including Merck. Reuters+1 Below is what investors and traders should know after the bell on 12/24/2025, and what to watch before the next U.S. cash-session open (note: