Likewise, what percentage of people roll their old 401k accounts into the account their current provider provides? I know a few people that have more than six 401k accounts! I myself have two since a previous employer's plan offers me some better options than my current plan provides. That 401k account does have less than $25k in it. I don't think the company that manages it knows the account is less than 4% of our total retirement account balances...
Good point - I've kept some in my previous employers' plans because they have a lower expense ratio.