| Morgan Stanley Smith Barney LLC | Purchase, NY | $1,961.89B | — |
| Merrill Lynch, Pierce, Fenner & Smith Incorporated | New York, NY | $1,781.57B | — |
| Managed Account Advisors LLC | Jersey City, NJ | $994.99B | — |
| Mellon Investments Corporation | Pittsburgh, PA | $873.87B | — |
| Millennium Management LLC | New York, NY | $720.85B | 10 |
| Morgan Stanley Investment Management Inc. | New York, NY | $702.25B | 14 |
| Metlife Investment Management, LLC | Whippany, NJ | $563.78B | 11 |
| Massachusetts Financial Services Company | Boston, MA | $514.05B | — |
| Mitsubishi Ufj Trust and Banking Corporation | Tokyo | $406.96B | — |
| Manulife Investment Management (US) LLC | Boston, MA | $228.04B | — |
| Mercer Investments LLC | Boston, MA | $226.04B | 40 |
| MacKenzie Financial Corporation | Toronto, Ontario | $194.88B | 2 |
| MacQuarie Investment Management Global Limited | Sydney | $187.35B | — |
| Mariner Investment Group, LLC | New York, NY | $176.31B | 17 |
| Morgan Stanley Investment Management Limited | London | $174.54B | 3 |
| MacKay Shields LLC | New York, NY | $159.52B | 16 |
| Mariner, LLC | Overland Park, KS | $125.41B | 2 |
| MML Investors Services, LLC | Springfield, MA | $115.64B | — |
| Mfs Institutional Advisors Inc. | Boston, MA | $113.59B | 6 |
| Morningstar Investment Management LLC | Chicago, IL | $87.82B | — |
| Mercer Global Advisors Inc. | Denver, CO | $84.4B | — |
| Metropolitan West Asset Management LLC | Los Angeles, CA | $78.52B | — |
| Meeder Public Funds, Inc. | Dublin, OH | $70.16B | — |
| Mio Partners, Inc. | New York, NY | $59.59B | 15 |
| Marshall Wace North America L.P. | New York, NY | $58.87B | 14 |
| Man Solutions Limited | London | $57.51B | 17 |
| Mai Capital Management, LLC | Cleveland, OH | $52.1B | 33 |
| Moneta Group Investment Advisors, LLC | St. Louis, MO | $50.54B | — |
| Mesirow Financial Investment Management, Inc. | Chicago, IL | $50.44B | 6 |
| Mondrian Investment Partners Limited | London | $49.31B | 27 |
| MacQuarie Infrastructure Partners Inc. | New York, NY | $48.84B | 60 |
| Manulife Investment Management Private Markets (US) LLC | Boston, MA | $48.31B | 44 |
| Marquette Associates, Inc. | Chicago, IL | $47.06B | — |
| Meag New York Corporation | New York, NY | $44.87B | — |
| Mawer Investment Management Ltd. | Calgary, Alberta | $40.94B | 17 |
| Morgan Stanley Aip GP LP | West Conshohocken, PA | $40.85B | 107 |
| Milliman Financial Risk Management LLC | Chicago, IL | $40.33B | — |
| Members Capital Advisors, Inc. | Madison, WI | $39.46B | 6 |
| Mason Street Advisors, LLC | Milwaukee, WI | $39.08B | — |
| Marathon Asset Management Limited | London | $39.04B | 8 |
| Ms Capital Partners Adviser Inc. | New York, NY | $38.76B | 67 |
| Mic Capital Management UK LLP | London | $36.8B | 35 |
| Morrison US, LLC | Wellington | $32.53B | 1 |
| Magnetar Financial LLC | Evanston, IL | $31.99B | 58 |
| Muzinich & Co., Inc. | New York, NY | $31.27B | 2 |
| Marathon Asset Management, L.P. | New York, NY | $30.48B | 70 |
| MML Investment Advisers, LLC | Springfield, MA | $24.55B | — |
| MacQuarie Investment Management Europe Limited | London | $24.51B | — |
| Matson Money, Inc. | Mason, OH | $24.33B | — |
| Makena Capital Management, LLC | Menlo Park, CA | $24.28B | 29 |