shares of valero energy corp vlo slid 270 to 12830 monday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 033 to 415132 and the dow jones industrial average djia rising 030 to 3398718 this was the stocks fourth consecutive day of losses valero energy corp closed 2209 short of its 52week high 15039 which the company achieved on january 27th the stock underperformed when compared to some of its competitors monday as exxon mobil corp xom fell 116 to 11470 and chevron corp cvx fell 088 to 17092 trading volume 35 m remained 878534 below its 50day average volume of 44 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