shares of biogen inc biib slid 242 to 20420 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 113 to 385593 and dow jones industrial average djia falling 101 to 3070623 the stocks fall snapped a fourday winning streak biogen inc closed 10001 short of its 52week high 30421 which the company reached on september 21st the stock underperformed when compared to some of its competitors tuesday as johnson  johnson jnj fell 079 to 16497 pfizer inc pfe fell 147 to 4477 and abbvie inc abbv fell 062 to 14177 trading volume 941265 eclipsed its 50day average volume of 867194 editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use