Instead of rolling over to your new employer, contact either Fidelity or Vanguard, and they will help you do a rollover to their low-cost platform. The money will go directly to them, avoiding any possibility of taxes. Then all you have to do is pick a few mutual funds to invest in! Consider their S&P 500 stock fund, or an Equity-Income Fund for at least half the rollover, assuming you will keep working. That means you will have a few years to keep your money growing before retirement.