Merck (MRK) Slides After the Bell on December 9, 2025: Keytruda Biosimilar Jitters and What to Watch Before the December 10 Open
Note: This article is for informational purposes only and does not constitute investment advice. Merck stock recap: What happened on December 9, 2025? Merck & Co., Inc. (NYSE: MRK) closed Tuesday, December 9, 2025 at $96.89, down 2.06% on the