No. 9: Dimensional Funds
Total mutual fund assets: $375 billion
Long-term assets (stock and bond funds): $375 billion
Named the favorite fund company by registered investment advisers, DFA features low-cost funds backed by top-flight research and economic theory. Using DFA offerings, such as its flagship U.S. Large Cap Value (DFLVX), with $23 billion in assets, advisers can put together high-wattage portfolios at minimal cost.