shares of valero energy corp vlo shed 012 to 12891 monday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 015 to 458896 and the dow jones industrial average djia rising 028 to 3555953 valero energy corp closed 2148 short of its 52week high 15039 which the company reached on january 27th the stock underperformed when compared to some of its competitors monday as exxon mobil corp xom rose 296 to 10724 and chevron corp cvx rose 302 to 16366 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