Merck (MRK) Stock: Key News, Analyst Targets, and Catalysts to Know Before the Market Opens Dec. 26, 2025
U.S. stock markets were closed for Christmas Day (Thursday, Dec. 25, 2025) and are scheduled to reopen Friday, Dec. 26 after a holiday-early close on Wednesday, Dec. 24. New York Stock Exchange+1 That timing matters for Merck & Co., Inc.