nitro,
i forget where I read about IB's routing but if i am not mistaken, your order if less than 2K shares will go to NYSE direct+ if an immediate fill can be obtained. I'm not sure what happens if your limit order is improving the bid or offer the moment you are transmitting. All other orders will be sent to superdot and thus a specialist may end up giving some price improvement.
Originally posted by Wonderduck
Yes, it is automatic. If order is routing to NYSE and is 1099 shares or less, it is done.
Originally posted by Htrader
I wish IB would make the Direct+ route an option that we could choose manually. As it stands now, IB's internal algorithm probably does not route to Direct+ as often as it could, resulting in some price improvement but also some missed fills.