shares of valero energy corp vlo slid 140 to 11318 thursday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 088 to 415128 and the dow jones industrial average djia falling 011 to 3276465 valero energy corp closed 3721 short of its 52week high 15039 which the company reached on january 27th despite its losses the stock outperformed some of its competitors thursday as exxon mobil corp xom fell 179 to 10566 and chevron corp cvx fell 172 to 15456 trading volume 44 m remained 300503 below its 50day average volume of 47 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