I am wondering whether market maker, or specialist exists for the E-mini S&P 500 futures. Soppose the following case: ask/bid is 1372.50/1372.25, and there are 5 orders on each side of the ask and bid. Then comes 5 buying market orders and 5 selling market orders. What happens then? which one of the following is true: a) will the 5 pairs of market orders be matched, thus still leaving 5 buy and 5 sells on the ask and bid level, and the market maker earns a profit of 1.25point. b) match the market buying order with the limit orders at the ask level, and match the market selling orders with the limit orders at the bid level, thus there is 0 orders remains at the ask and bid level, and no one makes a profit from the ask-bid spread. BTW, if any one could provide me the detail of the globex trading system, I will be very gratefull! Thank you!