If you submit a buy stop order prior to the market open, will you receive the opening price if the market opens above your stop price. For example: you place a buy stop order at $60 the night before. The next morning, the market opens at $61, will you be filled along with all the MOO (opg) orders or will they fill all the OPG orders first and then you will get what ever fill is available? Basically, if the opening price is above the buy stop price does the order essentailly become a MOO order and is therefore filled on the opening cross (opening price) along with all the OPG orders. Using IB if that makes a difference.