Merck (MRK) Stock Today, Nov 18, 2025: Shares Jump on Winrevair Phase 2 Win as Cidara Deal Builds Flu Portfolio
November 18, 2025 — Merck & Co. (NYSE: MRK) is trading higher today after the company reported new mid‑stage data for its cardiopulmonary medicine Winrevair (sotatercept‑csrk), fueling optimism about growth beyond Keytruda and adding momentum to last week’s acquisition of