At thinkorswim, we offer total securities account equity protection of $25 million. As a member of the Securities Investor Protection Corporation (SIPC) funds are available to meet customer claims up to a maximum of $500,000 in cash and securities with a $100,000 cash maximum. An additional $24,500,000 of supplemental securities protection including $900,000 maximum claim on cash has been purchased through the National Union Fire Insurance Company of Pittsburgh, PA (a member company of AIG) by our clearing firm. SIPC and AIG provide coverage against loss of securities and cash, not against market depreciation, fluctuation in market value of your securities or a trading loss. -------------------------------------------------------------------------------- They clear with Penson Financial Services Inc, just like CyberTrader and any number of other daytrading firms.