Biogen Stock (NASDAQ: BIIB) News and Forecasts for Dec. 20, 2025: RBC’s $210 Target, Leqembi Catalysts, and What Investors Are Watching
Biogen Inc. stock (NASDAQ: BIIB) is ending the week on a stronger note after a sharp, high-volume move on Friday’s session—an attention-grabbing setup heading into late December when liquidity often thins and headlines can move shares quickly. As of Saturday, December 20, 2025 (with U.S. markets closed), BIIB is effectively reflecting Friday, Dec. 19’s close of $174.80, up 2.88% on the day. Trading activity stood out: volume hit roughly 15.0 million shares, far above the recent ~1.9 million 50-day average—an unusual spike that often signals institutional participation rather than routine retail churn. MarketWatch+1 Below is a complete, publication-ready breakdown of