Not a big thing. You see this day after day in stock after stock. It's all manipulation. Anytime any aspect of a earnings report can be interpreted by someone as negative, there's a huge reaction like this. Some stocks like GMCR and JCP are nothing but daily manipulations-big price swings each way 2 or 3 times a week. Decent chance COP comes back some by day's end. May fall slightly tomorrow or maybe be up some. Next week will run with the sector. If anyone really wants more COP, this is a good buying opportunity. Otherwise, just sit tight.