Merck (MRK) Stock After Hours on Dec. 19, 2025: Trump Drug-Pricing Deal, FDA Fast-Track Vouchers, and What to Watch Before Markets Reopen
Merck & Co., Inc. (NYSE: MRK) finished Friday’s regular session (Dec. 19, 2025) modestly higher, then eased slightly in after-hours trading as investors digested a headline-heavy day featuring U.S. drug-pricing policy moves and FDA acceleration for two major Merck pipeline assets. Below is what happened after the bell, why it matters, and the key items to track before the next U.S. market open (Monday, Dec. 22, 2025). MRK stock price after the bell: the key numbers Merck shares closed at $101.09, up $0.40 (+0.40%) on Friday. Zacks+1 In after-hours trading, MRK was slightly lower, trading around $100.9–$101.0 in early evening