shares of vertex pharmaceuticals inc vrtx shed 235 to 27678 monday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 103 to 365504 and dow jones industrial average djia falling 111 to 2926081 this was the stocks second consecutive day of losses vertex pharmaceuticals inc closed 2917 below its 52week high 30595 which the company achieved on august 15th the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj fell 061 to 16570 merck  co inc mrk fell 069 to 8618 and abbvie inc abbv fell 129 to 14121 trading volume 16 m eclipsed its 50day average volume of 13 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