Quote from duard:
Watch level 2. When you see a constantly refreshing buy or sell order and a "wall" in which price doesn't penetrate more than likely you're looking at a hidden order of size. Not appreciated on level 2 except that bid/ask continually reloads just as it appears bids/asks are thinning.
Quote from joeyata1:
so true is a hidden order is not for little 200 shares to 1k its for big orders so they don't scare the market. also ever noticed how you can enter an order inbetween a bid and ask and get an instant fill. one's hitting an hidden order. yes i've seen the wall of sells line the time and sales box many times. it means 99% of the time when its doesn't move the prcie there's a big buyer and seller in there and its going the other way