Does anyone know of a website that shows what volume each ECN has done in a stock for the month? I know that http://www.nasdaqtrader.com outlines this information for Nasdaq, but I can't find this info. for NYSE stocks. Thanks
It's not going to be very high for most NYSE stocks, definitely less than 25%.
The more volume a listed stock does, the more of it will be off the floor, but still, in my experience, >75% of the volume is going to be thru the floor.
Sorry I don't have more exact statistics, but the above has been my experience...
