shares of pioneer natural resources co pxd slid 297 to 25471 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 110 to 398616 and dow jones industrial average djia falling 096 to 3179087 pioneer natural resources co closed 3375 below its 52week high 28846 which the company reached on may 31st despite its losses the stock outperformed some of its competitors tuesday as eog resources inc eog fell 372 to 12186 concho resources inc cxo fell 602 to 6560 and apa corp apa fell 493 to 3932true trading volume 25 m remained 155738 below its 50day average volume of 26 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