AFFILIATED MANAGERS GROUP, INC. - Common Stock (AMG)

CUSIP: 008252108

Q1 2026 13F Holders as of 31 Mar 2026

Security identity
Security type / class
Equity / Common Stock
Shares outstanding
26,719,538
Holder snapshot
Total 13F shares
24,816,577
Share change
-1,076,604
Total reported value
$6,867,556,455
Put/Call ratio
111%
Reported price per share
$276.70
Number of holders
538
Value change
-$309,773,498
Number of buys
296
Number of sells
179

Security key

008252108

Report period

Q1 2026

Institutions

538

Top holders

10

AMG full security history Ownership snapshot Full 13F holder table Previous quarter: Q4 2025 AFFILIATED MANAGERS GROUP, INC. SEC filings AFFILIATED MANAGERS GROUP, INC. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

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.

Lead holder
MORGAN STANLEY
13D/G signal
MORGAN STANLEY
Evidence rows
15
Latest as of
31 Mar 2026
13F 13D/G Lead comparable stake: 7% 13D/G row: MORGAN STANLEY Showing 1-6 of 15 holder rows.
Holder Evidence Ownership % Position 12M Net Δ As of
MORGAN STANLEY
13F 13D/G
Company
13F 13D/G
7%
from 13D/G
$491,726,009
1,705,721 shares
 — 31 Dec 2025
VANGUARD CAPITAL MANAGEMENT LLC
13D/G
Vanguard Capital Management
13D/G
5.2%
$383,712,065
1,386,744 shares
 $0 31 Mar 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
13D/G
Vanguard Portfolio Management
13D/G
5.1%
$378,644,581
1,368,430 shares
 $0 31 Mar 2026
INTEGRATED CORE STRATEGIES (US) LLC
13D/G
Millennium Management LLC
13D/G
3.6%
$242,510,253
1,017,113 shares
 -$116,590,124 30 Sep 2025
Clarkston Capital Partners, LLC
13D/G 13F
Company
13D/G 13F
3.2%
$260,639,425
904,119 shares
 -$192,591,220 31 Dec 2025
BlackRock, Inc.
13F
Company
13F
10%
$806,953,651
2,799,201 shares
 — 31 Dec 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 Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions
538
Shares
24,816,577
Rows available
538
Investor Option Weight % Change % Reported value * Price Shares Share Change Activity Report Period

* 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 failed the local validity check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders
506
Q1 2026 holders
538
Holder diff
32
Investor Q4 2025 Shares Q1 2026 Shares Share Diff Share Chg % Q4 2025 value Q1 2026 value Value change Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
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