shares of valero energy corp vlo shed 237 to 10774 tuesday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 161 to 446221 and the dow jones industrial average djia rising 145 to 3491120 the stocks fall snapped a threeday winning streak valero energy corp closed 274 below its 52week high 11048 which the company reached on april 18th the stock underperformed when compared to some of its competitors tuesday as phillips 66 psx rose 274 to 8955 and marathon petroleum corp mpc rose 037 to 9044 trading volume 51 m eclipsed its 50day average volume of 45 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