shares of valero energy corp vlo advanced 127 to 6552 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 034 to 452003 and dow jones industrial average djia falling 076 to 3510000 valero energy corp closed 1943 short of its 52week high 8495 which the company achieved on june 3rd the stock outperformed some of its competitors tuesday as phillips 66 psx fell 126 to 6874 marathon petroleum corp mpc rose 057 to 5857 and hollyfrontier corp hfc rose 088 to 3100 trading volume 30 m remained 11 million below its 50day average volume of 41 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