You have an insurance based plan. They are notoriosly the hardest to decipher all the fees.
Ask the plan administrator for the latest 5500 document and Summary Plan Documents and find the Ticker symbols for the funds in the plan. This may give a low end estimate of fees.
There may be other revenue sharing deals that are not disclosed. There are new regulations coming out this year that will shed light on these.
Not the answer you were looking for, but this is the way the retirement system has been run for years.
Time for change has come.
What a timely question! I completely agree with David. It's also worth noting that By November 14th of this year, 401(k) plan sponsors/ providers will issue the very first " disclosure of fees " statement which hopefully will contain the information you seek. Good luck, Evan