Hey u/sneff30,
The ability to roll a 401(k) plan to an IRA while he is still employed will depend on whether his plan offers an in-service rollover option. Please have your uncle work with his employer to determine his rollover options before proceeding. If he is eligible for an in-service rollover to an IRA, he can check out our IRA offering to assist him in choosing the right firm.
Learn more about choosing investments for your Fidelity IRA.