shares of biogen inc biib shed 270 to 20926 monday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 028 to 411863 and dow jones industrial average djia falling 014 to 3279840 the stocks fall snapped a fiveday winning streak biogen inc closed 14260 short of its 52week high 35186 which the company achieved on august 18th the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj fell 035 to 17391 pfizer inc pfe rose 020 to 5061 and abbvie inc abbv fell 229 to 14022 trading volume 11 m eclipsed its 50day average volume of 11 m 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