shares of valero energy corp vlo slid 056 to 12547 thursday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 064 to 453741 and dow jones industrial average djia falling 067 to 3528272 valero energy corp closed 2492 below its 52week high 15039 which the company reached on january 27th the stock demonstrated a mixed performance when compared to some of its competitors thursday as exxon mobil corp xom rose 031 to 10542 and chevron corp cvx fell 104 to 15966 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