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What's the best way to manage all the 401K accounts I've accumulated from my past jobs?
I'd roll them all into one account, just for your own convenience.  It's a pain to keep track of lots of different accounts, esp. since you need logins/passwords, etc for all of them, and we all have plenty of those.  :) Pick a place like Vanguard or Fidelity (for example), where you can find investment options with lower fees, and do the standard rollover.  Once all the accounts are rolled into one, you can think about how to invest the stuff.  (Some good investments require larger minimums, so if you have several old 401ks, putting them together will give you more options.) Rolling them over is not hard, if you have paperwork from each of the 401ks.  You might be able to DIY online, but I found it helpful to call and talk to a person when I did this.  You just need account numbers, etc.  If you are moving brokerage accounts, you may need to provide paper documents/applications, which might require getting them notarized (I found a notary at my bank, even though the accounts I was moving from and to weren't at my bank), which means you'll need to provide IDs, etc. and get a special crimped seal after the notary witnesses your signature.