If you are talking big cap stocks, say those that trade $100mil+ per day, and you generally buy on the open, at what stage will your order start influencing the opening price ? Say if this stock has $100mil money flow per day average, and does about $5million on the open. If your order is $500k will you influence the opening price? How about $250k? Any thoughts/comments/discussion is appreciated. Thanks. Nizar.