Latest Period
Q4 2025
Security Snapshot
AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG) Institutional Ownership
CUSIP: 008252108
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
503
Shares (Excl. Options)
25,854,029
Price
$288.28
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- Type / Class
- Equity / Common Stock
- Symbol
- AMG on NYSE
- Shares outstanding
- 26,719,538
- Price per share
- $276.70
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 25,854,029
- Total reported value
- $7,451,373,171
- % of total 13F portfolios
- 0.01%
- Share change
- -800,314
- Value change
- -$220,710,812
- Number of holders
- 503
- Price from insider filings
- $276.70
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- AMG - AFFILIATED MANAGERS GROUP, INC. - Common Stock is tracked under CUSIP 008252108.
- 503 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 503 to 168 between Q4 2025 and Q1 2026.
- Reported value moved from $7,451,373,171 to $255,084,397.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 503 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 008252108?
CUSIP 008252108 identifies AMG - AFFILIATED MANAGERS GROUP, INC. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 008252108:
Significant Owners of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| MORGAN STANLEY | 7% | $472,898,962 | 1,983,387 | Morgan Stanley | 30 Sep 2025 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $383,712,065 | 1,386,744 | Vanguard Capital Management | 31 Mar 2026 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.1% | $378,644,581 | 1,368,430 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| 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, 503 institutional investors reported holding 25,854,029 shares of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG). This represents 97% of the company’s total 26,719,538 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG) together control 70% 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. | 10% | 2,799,201 | -0.8% | 0.01% | $806,953,651 |
| VANGUARD GROUP INC | 10% | 2,683,585 | -3.2% | 0.01% | $773,623,884 |
| MORGAN STANLEY | 6.4% | 1,705,720 | -12% | 0.03% | $491,725,522 |
| ARIEL INVESTMENTS, LLC | 4.4% | 1,182,223 | -6.5% | 3.7% | $340,811,246 |
| Boston Partners | 4.3% | 1,136,710 | -1.8% | 0.34% | $327,757,300 |
| STATE STREET CORP | 3.5% | 929,397 | -3.6% | 0.01% | $267,926,567 |
| Clarkston Capital Partners, LLC | 3.4% | 904,119 | -27% | 6% | $260,639,425 |
| MILLENNIUM MANAGEMENT LLC | 3% | 796,010 | -22% | 0.16% | $229,473,763 |
| DIMENSIONAL FUND ADVISORS LP | 2.6% | 699,448 | +2.2% | 0.04% | $201,640,140 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.6% | 685,588 | +20% | 0.67% | $197,641,206 |
| LYRICAL ASSET MANAGEMENT LP | 2.1% | 551,587 | -4.9% | 2.2% | $159,011,500 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 551,153 | +8.1% | 0.01% | $158,916,400 |
| LSV ASSET MANAGEMENT | 1.8% | 473,021 | -1.4% | 0.3% | $136,362,000 |
| Allianz Asset Management GmbH | 1.6% | 426,649 | +8.5% | 0.14% | $122,994,374 |
| NORGES BANK | 1.5% | 394,559 | 0.01% | $113,743,469 | |
| NORTHERN TRUST CORP | 1.2% | 325,696 | -2.6% | 0.01% | $93,891,642 |
| CITADEL ADVISORS LLC | 1.2% | 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 | 1.1% | 295,418 | -16% | 0.02% | $85,163,102 |
| Channing Capital Management, LLC | 1.1% | 290,720 | -32% | 2.2% | $83,808,762 |
| BRUNI J V & CO /CO | 0.94% | 252,147 | -1.1% | 7.1% | $72,688,937 |
| Bank of New York Mellon Corp | 0.93% | 247,189 | +1.2% | 0.01% | $71,259,712 |
| Fisher Asset Management, LLC | 0.91% | 243,830 | +20% | 0.02% | $70,291,325 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 0.91% | 242,292 | -0.8% | 0.01% | $69,848,000 |
| RAYMOND JAMES FINANCIAL INC | 0.89% | 236,897 | +23% | 0.02% | $68,435,552 |
Institutional Holders of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 921,732 | $255,084,397 | +$29,540,426 | $276.70 | 168 |
| 2025 Q4 | 25,854,029 | $7,451,373,171 | -$220,710,812 | $288.28 | 503 |
| 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 |