<prompt> Human: So I took a new job about a year ago and now Im finally getting off my ass to rollover my old 401k. The old account is with John Hancock and has about 11k fully vested. New company uses T.Rowe.I figured I should rollover to a different account. Diversify right? Is Vanguard the consensus to use since its low hassle and good? I could rollover to my current 401k with T.Rowe and they claim to handle all the paperwork and such. Any disadvantages?  <response>: Who holds your account has nothing to do with diversification. You could have 100M bucks at a single broker but be invested in a single total market index fund and be more diverse than the guy who has accounts with 10 companies but just holds the same 4 stocks in each account. Vanguard is good if you are looking for basic index funds and some other good fund type options, sector funds, target funds, market cap funds small cap value, mid cap growth, etc. If you want even more investment options youll need a more traditional brokerage like Schwab, Fidelity, Scottrade, etc. Then you can buy 2 shares of Apple if you want. Or whatever. 