Affiliated Managers Group, Inc. (NYSE:AMG) showed up in the 13F filings of 501 institutional investors as of December 2025.
| Owner Name | Date | Shares Held | Change (QoQ) | Change (%) | Value (USD) |
|---|---|---|---|---|---|
| BlackRock, Inc. | 31 Mar, 2026 | 2,867,665 | 68,499 | 2.45% | $793,482,850.00 |
| BlackRock, Inc. | 31 Mar, 2026 | 2,799,166 | -22,689 | -0.80% | $806,943,561.00 |
| VANGUARD GROUP INC | 31 Mar, 2026 | 2,683,585 | -88,693 | -3.20% | $773,623,884.00 |
| Morgan Stanley | 31 Mar, 2026 | 1,732,512 | 26,791 | 1.57% | $479,386,628.00 |
| Morgan Stanley | 31 Mar, 2026 | 1,705,721 | -235,797 | -12.14% | $491,726,009.00 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 31 Mar, 2026 | 1,371,176 | 800,901 | 140.44% | $395,282,412.00 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 31 Mar, 2026 | 1,359,793 | 1,359,793 | 0.00% | $376,254,723.00 |
| ARIEL INVESTMENTS, LLC | 31 Mar, 2026 | 1,182,223 | -81,601 | -6.46% | $340,811,246.00 |
| VANGUARD CAPITAL MANAGEMENT LLC | 31 Mar, 2026 | 1,174,746 | 1,174,746 | 0.00% | $325,052,218.00 |
| Boston Partners | 31 Mar, 2026 | 1,136,710 | -20,634 | -1.78% | $327,757,300.00 |
| ARIEL INVESTMENTS, LLC | 31 Mar, 2026 | 1,064,030 | -118,193 | -10.00% | $294,417,101.00 |
| Boston Partners | 31 Mar, 2026 | 971,247 | -165,463 | -14.56% | $268,714,497.00 |
| State Street Corp | 31 Mar, 2026 | 929,397 | -34,311 | -3.56% | $267,926,567.00 |
| State Street Corp | 31 Mar, 2026 | 926,733 | -2,664 | -0.29% | $256,427,021.00 |
| Clarkston Capital Partners, LLC | 31 Mar, 2026 | 904,119 | -328,214 | -26.63% | $260,639,425.00 |
| MILLENNIUM MANAGEMENT LLC | 31 Mar, 2026 | 796,010 | -221,103 | -21.74% | $229,473,763.00 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 31 Mar, 2026 | 760,213 | -610,963 | -44.56% | $210,350,899.00 |
| DIMENSIONAL FUND ADVISORS LP | 31 Mar, 2026 | 718,313 | 18,865 | 2.70% | $198,745,831.00 |
| DIMENSIONAL FUND ADVISORS LP | 31 Mar, 2026 | 699,448 | 15,332 | 2.24% | $201,640,140.00 |
| GEODE CAPITAL MANAGEMENT, LLC | 31 Mar, 2026 | 635,778 | 84,625 | 15.35% | $175,955,023.00 |