I have noticed âwhere is my orderâ twice. I am not certain if it is a SMART problem or an exchange problem, although it appears to be SMART. Basically my limit orders are not always being reflected or executing when they should be. At some point minutes later they magically appear. These are orders which were entered long before the bid/ask reached their price. Here is a recent example in which there was a 5 minute period in which my bid size should have shown in a T&S log. There is only one 2 minute period in which it does. If my bid had been reflected I would have expected earlier executions, especially with Reg NMS now in effect. I did not contact IB about this because there was no damage and absent damage it is more difficult to pursue a problem. On 3/27 I had an order working to buy MED at 6.84 stop limit. 1:24:00 - The order triggered and was partially filled leaving 2300 unfilled. 2:02:14 - bids started being posted at 6.84 on various exchanges including the NYSE 2:02:29 â Only bid with enough size to be mine is posted on NASDAQ 2:03:09 - all exchanges available through my quote vendor (NYSE, AMEX, NASDAQ, ARCA) were posting bids of 6.84. 2:04:42 - Only bid with enough size is pulled from NASDAQ, there is no bid large enough to represent my order afterwards 2:05:54 â first executions at 6.84 2:06:57 â first executions under 6.84 2:07:10 â first fills for my order, in total order filled on 3 different exchanges, all of which are hitting the ask Has anyone else had similar experiences?