shares of ipg photonics corp ipgp shed 905 to 8399 thursday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 325 to 366677 and dow jones industrial average djia falling 242 to 2992707 ipg photonics corp closed 13652 below its 52week high 22051 which the company reached on august 2nd the stock underperformed when compared to some of its competitors thursday as northrop grumman corp noc fell 206 to 44902 ciena corp cien fell 551 to 4204 and iivi inc iivi fell 559 to 5304 trading volume 939171 eclipsed its 50day average volume of 650731 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