shares of west pharmaceutical services inc wst slid 175 to 41071 thursday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 157 to 453041 and dow jones industrial average djia falling 156 to 3467835 the stocks fall snapped a threeday winning streak west pharmaceutical services inc closed 6464 short of its 52week high 47535 which the company achieved on september 9th the stock underperformed when compared to some of its competitors thursday as johnson  johnson jnj fell 131 to 17723 medtronic plc mdt fell 055 to 11095 and stryker corp syk fell 067 to 26735 trading volume 798364 eclipsed its 50day average volume of 431431 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