So I read that some day traders can manage accounts amounting to many millions of dollars. This got me wondering. How exactly do they protect this money if they use an online broker since from what I read SIPC only protects cash up to $250,000 and stocks up to $500,000? So just as an example imagine you have a day trader who is managing a super large amount say $100 million dollars. At any given one time all this money might be held in the brokerage firm as cash, but cash is only protected up 250 grand. So what if the brokerage firm were to go bankrupt or, given all this hacking stuff in the news lately, some hacker were to erase all the account data showing your stock holdings and cash holdings? Since all the stocks would be held in street name and since SIPC only protects to 250 grand, wouldn't you be screwed? What I'd like to know is how do day traders protect themselves from these things?