Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can expense ratios on investment options in a 401(k) plan contain part of the overall 401(k) plan fees?
I question the reliability of the information you received.  Of course, it's possible the former 401(k) provider happened to charge lower expense ratios on its index funds than other available funds and lower the new provider's fees.  There are many many many financial institutions and fees are not fixed between them.  I think the information you received is simply an assumptive justification for the difference in fees.