User data on what stocks they buy and sell Except between the time the user clicks buy and when it the buy actually happens. Basically hedge funds are able to

User data on what stocks they buy and sell Except between the time the user clicks buy and when it the buy actually happens. Basically hedge funds are able to receive and parse this data, and change their orders to an advantage before the users order hits the actual exchange Its analogous to a MITM attack Despite my wording its not necessarily bad, but I think users should have a better understanding of it.