No, I'm not sure. But here's where I read it, and when I read it again it sure sounds that way (2nd paragraph): http://www.interactivebrokers.com/en/general/education/faqs/accountProtection.php?ib_entity=llc What's your opinion? OldTrader
That sure makes it sound like $150M is the limit for all of IB. I guess they are expecting SIPC to cover the vast majority of their customers. The $150m limit suggests that they don't have many customers with over $1m (or that perhaps the $150M is inadequate to protect their entire customer base). TOS would appear to have more accounts in excess of $1m based on their higher coverage.