| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | 9.8% | $660,882,897 | 2,771,811 | The Vanguard Group | 30 Sep 2025 | |||
| MORGAN STANLEY | 7% | $472,898,962 | 1,983,387 | Morgan Stanley | 30 Sep 2025 | |||
| INTEGRATED CORE STRATEGIES (US) LLC | 3.6% | -34% | $242,510,253 | -$116,590,124 | 1,017,113 | -32% | Millennium Management LLC | 30 Sep 2025 |
| Clarkston Capital Partners, LLC | 3.2% | -40% | $260,639,425 | -$192,591,220 | 904,119 | -42% | Clarkston Capital Partners, LLC | 31 Dec 2025 |
As of 31 Dec 2025, 497 institutional investors reported holding 25,899,207 shares of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG). This represents 92% of the company’s total 28,165,701 outstanding shares.
The largest institutional shareholders of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG) together control 66% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 9.9% | 2,799,201 | -0.8% | 0.01% | $806,953,651 |
| VANGUARD GROUP INC | 9.5% | 2,683,585 | -3.2% | 0.01% | $773,623,884 |
| MORGAN STANLEY | 6.1% | 1,705,720 | -12% | 0.03% | $491,725,522 |
| ARIEL INVESTMENTS, LLC | 4.2% | 1,182,223 | -6.5% | 3.7% | $340,811,246 |
| Boston Partners | 4% | 1,136,710 | -1.8% | 0.34% | $327,757,300 |
| STATE STREET CORP | 3.3% | 929,397 | -3.6% | 0.01% | $267,926,567 |
| Clarkston Capital Partners, LLC | 3.2% | 904,119 | -27% | 6% | $260,639,425 |
| MILLENNIUM MANAGEMENT LLC | 2.8% | 796,010 | -22% | 0.16% | $229,473,763 |
| DIMENSIONAL FUND ADVISORS LP | 2.5% | 699,448 | +2.2% | 0.04% | $201,640,140 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.4% | 685,588 | +20% | 0.67% | $197,641,206 |
| LYRICAL ASSET MANAGEMENT LP | 2% | 551,587 | -4.9% | 2.2% | $159,011,500 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 551,153 | +8.1% | 0.01% | $158,916,400 |
| LSV ASSET MANAGEMENT | 1.7% | 473,021 | -1.4% | 0.3% | $136,362,000 |
| Allianz Asset Management GmbH | 1.5% | 426,649 | +8.5% | 0.14% | $122,994,374 |
| NORGES BANK | 1.4% | 394,559 | 0.01% | $113,743,469 | |
| NORTHERN TRUST CORP | 1.2% | 325,696 | -2.6% | 0.01% | $93,891,642 |
| CITADEL ADVISORS LLC | 1.1% | 319,437 | -50% | 0.06% | $92,087,298 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1% | 305,596 | -2.2% | 0.01% | $88,097,215 |
| UBS Group AG | 1% | 295,418 | -16% | 0.02% | $85,163,102 |
| Channing Capital Management, LLC | 1% | 290,720 | -32% | 2.2% | $83,808,762 |
| BRUNI J V & CO /CO | 0.9% | 252,147 | -1.1% | 7.1% | $72,688,937 |
| Bank of New York Mellon Corp | 0.88% | 247,189 | +1.2% | 0.01% | $71,259,712 |
| Fisher Asset Management, LLC | 0.87% | 243,830 | +20% | 0.02% | $70,291,325 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 0.86% | 242,292 | -0.8% | 0.01% | $69,848,000 |
| RAYMOND JAMES FINANCIAL INC | 0.84% | 236,897 | +23% | 0.02% | $68,435,552 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 25,899,207 | $7,464,391,093 | -$199,895,646 | $288.28 | 497 |
| 2025 Q3 | 26,411,009 | $6,299,567,420 | -$66,089,846 | $238.43 | 445 |
| 2025 Q2 | 26,821,076 | $5,277,536,259 | -$84,552,044 | $196.77 | 429 |
| 2025 Q1 | 27,306,479 | $4,587,628,181 | -$145,951,145 | $168.03 | 392 |
| 2024 Q4 | 28,085,768 | $5,193,636,087 | -$37,146,826 | $184.92 | 402 |
| 2024 Q3 | 28,242,165 | $5,022,646,889 | -$137,327,716 | $177.80 | 415 |
| 2024 Q2 | 29,228,697 | $4,566,839,022 | -$179,986,644 | $156.23 | 400 |
| 2024 Q1 | 30,357,618 | $5,081,322,483 | -$178,552,037 | $167.47 | 397 |
| 2023 Q4 | 31,461,140 | $4,763,852,793 | -$11,154,607 | $151.42 | 378 |
| 2023 Q3 | 31,835,853 | $4,149,568,321 | -$160,169,124 | $130.34 | 351 |
| 2023 Q2 | 32,934,145 | $4,935,947,671 | -$231,274,446 | $149.89 | 373 |
| 2023 Q1 | 34,481,765 | $4,909,680,816 | -$59,148,004 | $142.42 | 381 |
| 2022 Q4 | 34,137,955 | $5,409,381,533 | +$201,992,929 | $158.43 | 359 |
| 2022 Q3 | 36,229,129 | $4,053,998,764 | -$95,089,153 | $111.85 | 313 |
| 2022 Q2 | 37,040,598 | $4,318,576,540 | -$58,258,396 | $116.60 | 295 |
| 2022 Q1 | 37,733,230 | $5,311,429,681 | -$218,204,978 | $140.95 | 321 |
| 2021 Q4 | 39,151,044 | $6,438,057,146 | -$164,556,122 | $164.51 | 353 |
| 2021 Q3 | 39,928,917 | $6,032,107,463 | -$170,562,006 | $151.09 | 324 |
| 2021 Q2 | 41,048,842 | $6,329,674,747 | -$157,575,379 | $154.21 | 329 |
| 2021 Q1 | 42,090,229 | $6,273,698,852 | -$440,697,642 | $149.03 | 306 |
| 2020 Q4 | 45,205,424 | $4,597,117,191 | -$72,126,508 | $101.70 | 284 |
| 2020 Q3 | 45,969,550 | $3,143,604,380 | -$5,955,763 | $68.38 | 264 |
| 2020 Q2 | 46,508,681 | $3,466,955,019 | -$13,902,860 | $74.56 | 278 |
| 2020 Q1 | 46,784,701 | $2,767,447,075 | -$113,671,530 | $59.14 | 280 |
| 2019 Q4 | 47,711,945 | $4,040,768,672 | -$45,362,983 | $84.74 | 334 |
| 2019 Q3 | 49,102,123 | $4,090,952,532 | +$39,428,685 | $83.35 | 339 |
| 2019 Q2 | 48,473,514 | $4,465,537,014 | -$31,880,160 | $92.14 | 375 |
| 2019 Q1 | 48,891,361 | $5,234,014,886 | -$154,855,612 | $107.11 | 412 |
| 2018 Q4 | 50,409,061 | $4,906,977,103 | +$53,794,751 | $97.44 | 427 |
| 2018 Q3 | 49,151,455 | $6,714,493,562 | -$191,621,615 | $136.72 | 475 |
| 2018 Q2 | 50,468,817 | $7,499,570,931 | -$191,203,585 | $148.67 | 493 |
| 2018 Q1 | 51,531,521 | $9,760,694,183 | -$262,996,308 | $189.58 | 520 |
| 2017 Q4 | 52,827,259 | $10,835,609,440 | -$175,408,484 | $205.25 | 518 |
| 2017 Q3 | 53,589,907 | $10,172,478,414 | -$112,608,493 | $189.83 | 477 |
| 2017 Q2 | 54,361,565 | $9,017,611,886 | +$140,994,861 | $165.86 | 470 |
| 2017 Q1 | 53,956,649 | $8,847,175,181 | +$469,802,414 | $163.94 | 504 |
| 2016 Q4 | 54,853,984 | $7,971,388,132 | +$66,774,045 | $145.30 | 513 |
| 2016 Q3 | 53,601,357 | $7,752,548,730 | -$108,654,946 | $144.70 | 487 |
| 2016 Q2 | 54,381,822 | $7,654,720,426 | +$132,371,054 | $140.77 | 492 |
| 2016 Q1 | 53,349,360 | $8,665,363,706 | +$192,150,836 | $162.40 | 464 |
| 2015 Q4 | 52,357,591 | $8,364,624,405 | -$11,524,045 | $159.76 | 465 |
| 2015 Q3 | 52,447,025 | $8,970,785,737 | -$306,320,879 | $170.99 | 476 |
| 2015 Q2 | 52,933,510 | $11,571,421,772 | -$228,468,555 | $218.60 | 490 |
| 2015 Q1 | 53,987,010 | $11,595,398,567 | +$51,137,312 | $214.78 | 486 |
| 2014 Q4 | 53,793,721 | $11,415,848,919 | +$180,294,979 | $212.24 | 475 |
| 2014 Q3 | 54,246,431 | $10,868,638,071 | -$145,805,813 | $200.36 | 463 |
| 2014 Q2 | 54,910,852 | $11,278,073,239 | +$275,675,443 | $205.40 | 453 |
| 2014 Q1 | 52,825,053 | $10,565,698,089 | +$122,385 | $200.05 | 446 |