Merck (MRK) stock slides as JPMorgan conference tests deal buzz and vaccine risk
New York, January 12, 2026, 14:42 EST — Regular session. Merck & Co shares slipped $1.26, or 1.1%, to $109.27 in Monday afternoon trading. The stock has fluctuated between $111.45 and $108.95 today. Investors want clarity on Merck’s next steps beyond Keytruda and its legacy blockbusters. The upcoming J.P. Morgan Healthcare Conference promises to bring that question into sharp focus.…