No. 5: J.P. Morgan Chase & Co.
Total mutual fund assets: $532.1 billion
Long-term assets: $288.5 billion
The white-shoe brokerage firm is also a quiet giant in the mutual fund world, particularly in money-market funds. At $139.2 billion in assets, JPMorgan U.S. Government Money Market (SJGXX) is currently the largest money fund in the U.S.