Latest Period
Q1 2026
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
539
Shares (Excl. Options)
24,816,592
Price
$276.70
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Common Stock
- Symbol
- AMG on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 24,816,592
- Total 13F value
- $6,867,560,606
- Portfolio coverage rank
- 0.01%
- Share change
- -1,078,463
- Value change
- -$310,297,171
- Number of holders
- 539
- Shares outstanding
- 26,719,538
- SEC-reported price per share
- $276.70
- Insider filing price
- $276.70
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- AMG - AFFILIATED MANAGERS GROUP, INC. - Common Stock is tracked under CUSIP 008252108.
- 539 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 507 to 539 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $7,466,019,070 to $6,867,560,606.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 539 institutions filings for Q1 2026.
Security key
008252108
Latest holder period
Q1 2026
13F holders
539
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
AMG full holder history
AFFILIATED MANAGERS GROUP, INC. SEC filings
AFFILIATED MANAGERS GROUP, INC. company facts
AFFILIATED MANAGERS GROUP, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 008252108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
AMG
| 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 Mar 2026, 539 institutional investors reported holding 24,816,592 shares of AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG). This represents 93% of the company’s total 26,719,538 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
64%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11% | 2,867,665 | +2.4% | 0.01% | $793,482,850 |
| MORGAN STANLEY | 6.5% | 1,732,512 | +1.6% | 0.03% | $479,386,628 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.1% | 1,359,793 | 0% | 0.02% | $376,254,723 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.4% | 1,174,746 | 0% | 0.01% | $325,052,218 |
| ARIEL INVESTMENTS, LLC | 4% | 1,064,030 | -10% | 3.3% | $294,417,101 |
| Boston Partners | 3.6% | 971,247 | -15% | 0.28% | $268,714,497 |
| STATE STREET CORP | 3.5% | 926,733 | -0.29% | 0.01% | $256,427,021 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.8% | 760,213 | +11% | 0.71% | $210,350,899 |
| DIMENSIONAL FUND ADVISORS LP | 2.7% | 718,313 | +2.7% | 0.04% | $198,745,831 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 635,778 | +15% | 0.01% | $175,955,023 |
| LYRICAL ASSET MANAGEMENT LP | 1.9% | 502,121 | -9% | 2.1% | $138,936,881 |
| Allianz Asset Management GmbH | 1.8% | 488,742 | +15% | 0.16% | $135,234,911 |
| LSV ASSET MANAGEMENT | 1.8% | 476,811 | +0.8% | 0.28% | $131,934,000 |
| BANK OF AMERICA CORP /DE/ | 1.5% | 409,578 | +76% | 0.01% | $113,330,258 |
| NORTHERN TRUST CORP | 1.3% | 348,882 | +7.1% | 0.01% | $96,535,650 |
| Invesco Ltd. | 1.2% | 316,490 | +227% | 0.01% | $87,572,785 |
| Clarkston Capital Partners, LLC | 1.2% | 313,708 | -65% | 6.6% | $86,803,004 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.2% | 308,031 | +0.8% | 0.01% | $85,232,178 |
| Channing Capital Management, LLC | 1.1% | 302,672 | +4.1% | 2.1% | $83,749,342 |
| Bank of New York Mellon Corp | 1.1% | 300,265 | +21% | 0.02% | $83,083,403 |
| Fisher Asset Management, LLC | 0.95% | 253,263 | +3.9% | 0.02% | $70,077,944 |
| JANE STREET GROUP, LLC | 0.95% | 252,505 | +530% | 0.08% | $69,868,134 |
| BRUNI J V & CO /CO | 0.93% | 249,765 | -0.94% | 7.2% | $69,109,976 |
| CITADEL ADVISORS LLC | 0.93% | 247,220 | -23% | 0.05% | $68,405,774 |
| RAYMOND JAMES FINANCIAL INC | 0.87% | 231,461 | -2.3% | 0.02% | $63,579,456 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 24,816,592 | $6,867,560,606 | -$310,297,171 | $276.70 | 539 |
| 2025 Q4 | 25,904,833 | $7,466,019,070 | -$220,573,014 | $288.28 | 507 |
| 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 |