OK. Fair enough. I thought your order was submitted at 3:58 like yesterday, assuming we are talking EST, but it sort of makes my following argument invalid anyway. At any rate, in the recent high volatility environment, a market order at two minutes before close of business is bound to get abused. However, I see no unusual volume behavior at 1:00PM EST today to cause such slippage (which you don't illustrate for today, BTW). I would talk to AMP and see what they have to say about it. Just for the record, I use AMP with CQG/NT and rarely ever experience slippage, however, virtually all my orders are limit.