shares of biogen inc biib shed 071 to 27002 friday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 105 to 397004 and dow jones industrial average djia falling 102 to 3281692 this was the stocks second consecutive day of losses biogen inc closed 4186 short of its 52week high 31188 which the company reached on november 30th despite its losses the stock outperformed some of its competitors friday as johnson  johnson jnj fell 112 to 15597 and pfizer inc pfe fell 130 to 4175 trading volume 904499 remained 143186 below its 50day average volume of 10 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