Merck (MRK) Stock After Hours Today (Dec. 23, 2025): Shares Slip Slightly After the Close as Investors Track TrumpRx Pricing Deal, FDA Fast-Track Vouchers, and Fresh Wall Street Targets
NEW YORK — Merck & Co., Inc. (NYSE: MRK) ended regular trading Tuesday, December 23, 2025, at $105.04, and eased modestly in after-hours trading to about $104.81 (down roughly 0.2%) as of early evening in New York. Google The move