Hi traders, Often I see prints in the middle of the stock's bid/ask spread. Example: 2400 28.00 --- 28.005 x 100 --- 28.01 500 2400 28.00 --- 28.01 x 200 ---- 28.01 500 2400 28.00 --- 28.0069 x 100 -- 28.01 500 What are they? If this is a price improvement a bd gives to a trader on a market order, what is the reason to print it in the middle of the spread instead of improving by only 0.0001 (i.e. instead of 28.0050 -> 28.0099 if somebody hits the offer)? To conceal if it was buy or sell?