shares of valero energy corp vlo slid 219 to 13372 wednesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 041 to 409195 and dow jones industrial average djia falling 011 to 3364650 the stocks fall snapped a twoday winning streak valero energy corp closed 1667 below its 52week high 15039 which the company reached on january 27th