shares of quanta services inc pwr slid 649 to 11378 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 190 to 456700 and dow jones industrial average djia falling 186 to 3448372 quanta services inc closed 1091 short of its 52week high 12469 which the company reached on november 8th the stock underperformed when compared to some of its competitors tuesday as emcor group inc eme fell 215 to 11934 mastec inc mtz fell 575 to 9217 and dycom industries inc dy fell 458 to 9348 trading volume 16 m eclipsed 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