Biogen (BIIB) Stock Chart & Stock Price History $132.22 -0.43 (-0.32%) Closing price 08/29/2025 04:00 PM EasternExtended Trading$134.05 +1.83 (+1.38%) As of 08/29/2025 07:59 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Biogen Stock Price Performance The Biogen (BIIB) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 35.43%, with a year-to-date return of -13.54%. In the past month, the stock has increased 4.41%, reflecting recent market activity. As of the latest close, Biogen traded at $132.22 with a market cap of $19.39 billion and volume of 1.08 million shares. Five years ago, the stock traded at $281.46, representing a 53.02% decrease over that period. At the time, it had a market cap of $44.56 billion and a volume of 810,530 shares. Receive BIIB Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Biogen and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. 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Read our full terms of service and privacy policy. 5 Day Performance-3.04%1 Month Performance+4.41%3 Month Performance+0.85%Year-To-Date Performance-13.54%1 Year Performance-35.43%5 Year Performance-53.02% BIIB Stock Chart for Saturday, August, 30, 2025 BIIB Chart by TradingView Biogen Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/29/2025$132.65$132.22-0.32%$133.48$131.521.08 million shs$19.39 billion08/28/2025$136.36$132.65-2.72%$136.36$132.041.56 million shs$19.45 billion08/27/2025$136.72$136.36-0.26%$138.50$135.791.40 million shs$19.99 billion08/26/2025$136.36$136.72+0.26%$136.91$135.221.58 million shs$20.05 billion08/25/2025$139.31$136.36-2.12%$139.75$136.14861,785 shs$19.99 billion08/22/2025$139.12$139.31+0.14%$142.32$138.651.20 million shs$20.42 billion08/21/2025$138.99$139.12+0.09%$140.20$137.591.07 million shs$20.40 billion08/20/2025$138.86$138.99+0.09%$140.50$137.771.29 million shs$20.38 billion08/19/2025$135.91$138.86+2.17%$139.58$136.021.45 million shs$20.36 billion08/18/2025$138.60$135.91-1.94%$141.18$135.741.81 million shs$19.93 billion Get the Latest News and Ratings for BIIB and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Biogen and its competitors with MarketBeat's FREE daily newsletter. 08/15/2025$134.94$138.60+2.71%$138.83$135.881.64 million shs$20.32 billion08/14/2025$135.21$134.94-0.20%$135.23$132.161.17 million shs$19.78 billion08/13/2025$128.93$135.21+4.87%$135.38$129.401.55 million shs$19.82 billion08/12/2025$128.00$128.93+0.73%$131.10$128.251.13 million shs$18.77 billion08/11/2025$130.67$128.00-2.04%$133.73$127.711.07 million shs$18.77 billion08/08/2025$127.75$130.67+2.29%$131.26$127.001.33 million shs$19.16 billion08/07/2025$129.34$127.75-1.23%$130.68$127.651.72 million shs$18.73 billion08/06/2025$132.89$129.34-2.67%$132.67$128.901.54 million shs$18.96 billion08/05/2025$132.20$132.89+0.52%$134.16$131.571.40 million shs$19.48 billion08/04/2025$131.95$132.20+0.19%$133.98$130.391.90 million shs$19.38 billion08/01/2025$128.00$131.95+3.09%$132.90$124.562.80 million shs$19.33 billion07/31/2025$126.64$128.00+1.07%$135.43$127.243.24 million shs$18.76 billion07/30/2025$127.90$126.64-0.99%$129.78$125.971.89 million shs$18.56 billion07/29/2025$129.28$127.90-1.07%$129.26$127.601.11 million shs$18.74 billion Related Companies Amgen Stock Chart Gilead Sciences Stock Chart Ionis Pharmaceuticals Stock Chart Moderna Stock Chart Prothena Stock Chart Cassava Sciences Stock Chart Vertex Pharmaceuticals Stock Chart AbbVie Stock Chart Bristol Myers Squibb Stock Chart Eli Lilly and Company Stock Chart Receive BIIB Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Biogen and its competitors with MarketBeat's FREE daily newsletter. 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