Security key
008252108
AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG)
CUSIP: 008252108
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 25,904,850
- Total 13F value
- $7,466,023,971
- Share change
- -799,836
- Put/Call ratio
- 14%
- SEC-reported price per share
- $288.28
- Number of holders
- 508
- Value change
- -$220,573,014
- Number of buys
- 226
- Number of sells
- 199
- Shares outstanding
- 26,719,538
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
508
Top holders
10
AMG full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
AFFILIATED MANAGERS GROUP, INC. SEC filings
AFFILIATED MANAGERS GROUP, INC. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 008252108
Recent filing periods:
Ownership snapshot
Top reported holders of AMG - AFFILIATED MANAGERS GROUP, INC. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
MORGAN STANLEY
Disclosed value leader
BlackRock, Inc.
Comparable rows
15/15
Latest evidence
30 Sep 2025
13D/G
13F
Lead comparable stake: 7%
13D/G row: MORGAN STANLEY
Showing 1-6 of 15 holder rows.
Quick read
MORGAN STANLEY leads the comparable SEC ownership view at 7%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens MORGAN STANLEY's linked filing trail.
Comparable ownership
Top 5
MORGAN STANLEY
7%
INTEGRATED CORE STRATEGIES (US) LLC
3.6%
Clarkston Capital Partners, LLC
3.2%
BlackRock, Inc.
11%
VANGUARD GROUP INC
10%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| MORGAN STANLEY |
13D/G
13F
Company
|
7%
|
$472,898,962
1,983,387 shares
|
$0 | 30 Sep 2025 |
| INTEGRATED CORE STRATEGIES (US) LLC |
13D/G
Millennium Management LLC
|
3.6%
|
$242,510,253
1,017,113 shares
|
-$116,590,124 | 30 Sep 2025 |
| Clarkston Capital Partners, LLC |
13F
13D/G
Company
|
3.2%
from 13D/G
|
$293,825,157
1,232,333 shares
|
— | 30 Sep 2025 |
| BlackRock, Inc. |
13F
Company
|
11%
|
$672,814,797
2,821,855 shares
|
— | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
Company
|
10%
|
$660,994,243
2,772,278 shares
|
— | 30 Sep 2025 |
| ARIEL INVESTMENTS, LLC |
13F
Company
|
4.7%
|
$301,333,556
1,263,824 shares
|
— | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
508
Shares
25,904,850
Rows available
508
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
445
Q4 2025 holders
508
Holder diff
63
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend