Assent alone has more than 1500 traders itself. That isn't including Hold, RBC or some others out there.
So my rough (very wrong) estimates = 19% of Fridays Nasdaq volume. The point of this thread is to determine the loss of business to the Exchanges that enforcing the PDT rule would have.
1500 traders or 1500 accounts. There is a big difference. Between all the prop houses you might have 5k+ accounts. But how many active traders?
"they dont even register. they are insignificant" I remember one daytrading firm in the .com days trading 20% of emlx daily volume-about 5million shares....they were just one operation.I was astounded at that time.I would bet that prop firms trade at least 30% of the market and wouldnt be surprised if it was 40 or 50 % of the market...I dont have stats but i remember before the advent of web trading in 1996 avg nyse volume at 200-400million daily. The massive increase in vol came with the web and daytrading firms.
joab your #'s are faulty. assent has 1500 traders,genesis over 3k and lightspeed 1500. thats not including bright,hold,echo and probably 5-10 others. that alone is 10k hard core traders. 10k hard core and lets be conservative and say 25k a day(tons do 200k-1 mil and many do litttle to none). 10k traders x 25k vol a day is 250 mil a day vol . add in hyper traders from swift and title and thats another 200 mil easy. i'd say easily all day traders do 500 mil- 1 bil a day of the total vol are 20% of total vol