"OptionsXpress is headquartered in Chicago, Illinois". --- I was advised last year by OX support that their rules were different to the US laws and were based off Australian laws. Turns out this is incorrect and WIKI confirms it. My account has been "downgraded", to put it loosely, due to breaching the PDT rules. I wasn't aware I was effected by it. So, be aware, if you use OX you need $25k + in your account so you're not effected by the PDT rule. I'll be adding funds Monday so I can get back to some hands on learning. Call them to confirm if unsure.