I am pretty sure that that there are traders who trade by recognizing which of the large brokerages is the biggest market maker in a particular NASDAQ stock and front running them. Is there anyone here that does that and would like to post more information. Also if anyone knows of any ways in figuring out which market maker has the biggest effect on a particular stock that would also be nice. Preferably there should be some algorithmic way of deducing this, if there isnât one already there probably is room for one. The only way I that I figured of figuring out who really controls the stock is to see who the original underwriter was. This might work on thin stocks. Any thoughts?