One more thing: Other than the fees, loads, or commissions, some funds charge redemption fee if you hold the fund less than a period of time. Different 401K investment companies have different funds, policies and fees. So, you have to be very careful.
Example:
A 2% redemption fee may be imposed on shares held for 3 months or less. Performance shown does not reflect this redemption fee and, if reflected, performance would have been lower.