shares of pioneer natural resources co pxd slumped 097 to 20432 wednesday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 014 to 399201 and the dow jones industrial average djia falling 018 to 3279840 this was the stocks third consecutive day of losses pioneer natural resources co closed 8414 short of its 52week high 28846 which the company achieved on may 31st the stock underperformed when compared to some of its competitors wednesday as eog resources inc eog fell 036 to 11783 devon energy corp dvn fell 096 to 5450 and occidental petroleum corp oxy rose 214 to 6215 trading volume 26 m eclipsed its 50day average volume of 23 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