shares of vertex pharmaceuticals inc vrtx slid 745 to 23502 monday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 320 to 399124 and dow jones industrial average djia falling 199 to 3224570 this was the stocks third consecutive day of losses vertex pharmaceuticals inc closed 5773 below its 52week high 29275 which the company reached on april 14th the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj rose 054 to 17733 merck  co inc mrk fell 085 to 8764 and abbvie inc abbv fell 122 to 15096 trading volume 31 m eclipsed its 50day average volume of 17 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