Great question. I've wondered about this one myself and figured it has to be about 75C, 25S also. Reason being, most indexes are heavily overweight in 10-20 individual stocks instead of being spread across the board.
According to Morningstar and using WFIVX as the Wilshire 5000 index here are the weighted holdings.
Giant 41.19
Large 30.31
Medium 19.36
Small 6.39
Micro 2.74
So figure you're looking at at least 70% of those stocks most likely being in the C Fund. Note that Berkshire is #14 on their top 25 holdings list, yet not a component of the S&P 500.
http://quicktake.morningstar.com/Fun...A&Symbol=WFIVX
Good luck!
Bookmarks