I've been concerned about this as well, not so much fear of the company going under, but of identity theft and having the funds siphoned off. As a target before, I know how much of a nightmare that can be, and that was back when I had <$0 net worth. So I recently decided to transfer my IRAs to another company, keeping my taxable account where it is, which distributes things fairly well between the two. There's no cost to doing so, and minimal additional complication/overhead.