shares of phillips 66 psx slid 570 to 9051 wednesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 013 to 375989 and dow jones industrial average djia falling 015 to 3048313 phillips 66 closed 2077 short of its 52week high 11128 which the company reached on june 8th the stock underperformed when compared to some of its competitors wednesday as exxon mobil corp xom fell 396 to 8786 chevron corp cvx fell 435 to 14787 and marathon petroleum corp mpc fell 252 to 8906 trading volume 52 m eclipsed its 50day average volume of 43 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