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Why Biogen Stock Popped as Much as 37.1% This Week

Why Biogen Stock Popped as Much as 37.1% This Week

Shares of Biogen (NASDAQ: BIIB) shot up as much as 37.1% this week, according to data from S&P Global Market Intelligence. The large-cap drugmaker with a market cap of $39 billion announced that its new Alzheimer's drug it developed in a partnership with Eisai showed tremendous promise in a clinical trial. As of 12:42 p.m. ET on Friday, shares of Biogen were up 35.5% this week.