You can roll over your old 401(k) into your new employer's program.
Do You Know What to Do with Your 401(k)?
Choices to Make About Your 401(k)
Stay Put
If you're happy with your former 401(k), you can leave your account where it is.
Take Your Plan
Understand Your Choices
You can elect to roll over your traditional 401(k) into a traditional IRA.