Why is the official close price of today's IWM $77.46? I was trading right around 16:00PM EST, IWM at that time was bouncing around $77.15 - $77.19. Between 16:00PM to 16:15PM, it was trading in the $77.10 - $77.20 range. But AMEX and all quote services have $77.46 as the last regular trading hour close price, thats almost 0.4%'s difference. Does anyone know why? Thanks.