No. 1: The Vanguard Group
Total mutual fund assets: $3.4 trillion
Long-term assets (stock and bond funds): $3.2 trillion
The king of low-cost investing, Vanguard’s stable of funds — both index and actively managed — delivers market exposure at rock-bottom prices. Its largest fund, Vanguard Total Stock Market (VTSMX), now has $603.6 billion dollars in assets, which is 6.2% of all domestic stock funds.