shares of pioneer natural resources co pxd slipped 271 to 20118 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 064 to 410990 and dow jones industrial average djia falling 101 to 3301214 pioneer natural resources co closed 8728 short of its 52week high 28846 which the company achieved on may 31st the stock demonstrated a mixed performance when compared to some of its competitors tuesday as eog resources inc eog fell 333 to 10763 devon energy corp dvn fell 331 to 4613 and occidental petroleum corp oxy fell 065 to 5814 trading volume 15 m remained 990054 below its 50day average volume of 25 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