Quote from Traderham:
Scottrade, Tradestation, and IB don't offer imbalance info. Why do some places have it only 10 minutes before the close and others 20 minutes? I know it starts 20 minutes before the close. And places like Trade The News give an overall imbalance info at 15 minutes before the close.
Quote from Surdo:
1. A NYSE specialist will often take the other side but will try to attract natural buyer's/seller's first.
2.Yes, they are filled because they are "Market Order's".