Greetings Please assist me in my knowledge growth if you can. I traded market order at 10min before open today for VVUS. It filled at the price of $30.33 (100 shares) 0.3 less then the official Nasdaq opening price. TD Ameritrade doesn't have an office MOO order so that is their version of that I guess. Scenario: If I would have put a limit order trigger in after the fill to sell at $30.50, and the time and sales information 'would' have showed that sale (time & sales) of $30.50 for 100 shares two minutes later, would I have been 'guranteed' that fill price? I'm trying to understand the limit order dynamics. Thanks in Advance.