shares of valero energy corp vlo slumped 003 to 7130 wednesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 102 to 469656 and the dow jones industrial average djia rising 074 to 3575389 valero energy corp closed 1365 short of its 52week high 8495 which the company achieved on june 3rd despite its losses the stock outperformed some of its competitors wednesday as phillips 66 psx fell 072 to 7162 marathon petroleum corp mpc fell 050 to 6310 and hollyfrontier corp hfc fell 074 to 3212true trading volume 18 m remained 19 million below its 50day average volume of 38 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