Using the DOM, I often see the last trade @ a number of lots that is not reflected on the T&S or the L2 screen. For example, on the attachment you have a last trade shown as 100 @ 71.91, yet there were no single trades or even a combination of smaller lots that added up to 100 (10,000 shares) at that point in time. Am I misinterpreting what that number means? It's usually 1 @ and sometimes 0 @, but occasionally it's a large number that doesn't match the other data I have.