shares of quanta services inc pwr slipped 156 to 13910 thursday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 030 to 396685 and the dow jones industrial average djia rising 046 to 3165642 quanta services inc closed 1023 below its 52week high 14933 which the company achieved on august 25th the stock underperformed when compared to some of its competitors thursday as emcor group inc eme fell 141 to 11724 mastec inc mtz fell 144 to 7934 and dycom industries inc dy fell 138 to 11057 trading volume 13 m eclipsed its 50day average volume of 11 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