Quote from 1245:
One big difference in running an electronic strategy with either a high touch order an automated system , and being a member of the exchange which requires being a broker dealer, is bulk quoting. If I'm running Actant as a member of an exchange, every time markets move, Actant can send out one message and change around 300 quotes. Also, I can make two sided markets. As a non BD, they have a platform called Actant Extreme which can simulate market making. NO BD, NO bulk transfers. Still works well. Options City also has something similar.