Merck (MRK) Stock After Hours: Key News, Analyst Calls, and What to Watch Before the Dec. 19, 2025 Market Open
Merck shares closed up 1.52% at $100.69 on Thursday, with after-hours trading showing little change. The move followed a BMO Capital Markets upgrade to Outperform and a price target hike to $130, citing confidence in Merck’s post-Keytruda growth prospects. Trading volume topped 14.2 million shares, above the 50-day average. Merck outperformed Johnson & Johnson and Pfizer on the day.