Limited Liability Company. Because some profitable strategies have unexpected risk,such as naked call,put,or maybe OTM spread. So,under normal condition,nothing would happen,but under some extremely unexpected condition(black swan event),then the shit will hit the fan. Losing all capital is expected by most traders,but how about not only losing the entire capital,but also bearing the unsettled loss?It must be terrible. So,through the forming of LLC,getting assurance by paying tax to IRS. But is anyone here doing this?