Affiliated Managers Group, Inc.
AMG- Exchange
- NYSE
- Industry
- Investment Advice
- SEC CIK
- 0001004434
No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 567 institutions reported holding it in 13F filings for Q2 2026, worth $8.53B in total; Southeastern Asset Management (Longleaf) is the only superinvestor holding it.
Holders of 5% or more of AMG
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Affiliated Managers Group, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Integrated Core Strategies (US) LLC | 13G | 5.30%1.51M shares | +1.00 ppfrom 4.30% | May 14, 20252 filings | Jun 6, 2025 | SEC |
| Clarkston Capital Partners, LLC | 13G/A | 5.20%1.57M shares | – | Feb 14, 20251 filing | Feb 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
3 Schedule 13D and 13G filings on Affiliated Managers Group, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jun 6, 20254:00 PM ET | Integrated Core Strategies (US) LLCand 3 others | 13G | 5.30%1.51M shares | +1.00 ppfrom 4.30% | Jun 2, 2025 | SEC |
| May 14, 20254:00 PM ET | Integrated Core Strategies (US) LLCand 3 others | 13G | 4.30%1.22M shares | NewBelow 5% | May 7, 2025 | SEC |
| Feb 14, 202511:47 AM ET | Clarkston Capital Partners, LLCand 5 others | 13G/A | 5.20%1.57M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Affiliated Managers Group, Inc. shares.
No Form 144 notices for Affiliated Managers Group, Inc. are on file.