Biogen traded at $140.67 this Friday September 5th, increasing $0.73 or 0.52 percent since the previous trading session. Looking back, over the last four weeks, Biogen gained 8.76 percent. Over the last 12 months, its price fell by 30.02 percent. Looking ahead, we forecast Biogen to be priced at 139.50 by the end of this quarter and at 136.06 in one year, according to Trading Economics global macro models projections and analysts expectations.