Well...I think you missed that maybe UBSS trades for certain companies (other brokers), because I sure as hell dont see a few brokers on that list.
I dont see:
JP Morgan Chase
Scottrade, LLC
TD Ameritrade
Merrill Lynch
ShareBuilder
Charles Schwab
and the list goes on and on...
I know a few people on this board use Scottrade, but for some reason, that one isn't on your list. hmmmmmmmmmmm