Affiliated Managers Group
Builds equity partnerships with independent investment firms while preserving their operating autonomy.
$370.87
After-hours close−0.07 (−0.02%)
At close$370.94(+0.12%)
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Breakdown13F · Form 4
Institutions 134.06%Insiders 2.12%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 26.41M · Float 25.40M
This issuer lists more than one class and the share count spans them all, so a stake here reads as a share of the whole company, not of this class.
Institutions13F, as of Jun 30, 2026
578 holders · 35.41M shares · 84 new positions · 245 increased · 216 reduced · 62 closed
| Holder | Shares | % of company | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 2.77M | 10.50% | −94.9K | Aug 7, 2026 |
| Morgan Stanley | 1.49M | 5.63% | −245.3K | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 1.39M | 5.27% | +32.0K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 1.15M | 4.36% | −23.7K | Aug 13, 2026 |
| Boston Partners | 1.00M | 3.79% | +30.7K | Aug 4, 2026 |
| Ariel Investments, LLC | 999.7K | 3.78% | −64.4K | Aug 14, 2026 |
| State Street Corp | 883.3K | 3.34% | −43.4K | Aug 7, 2026 |
| Millennium Management LLC | 875.1K | 3.31% | +869.7K | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Morgan Stanley | 7.00% | 1.98M | 13G | Nov 7, 2025 ↗ |
| Vanguard Capital Management | 5.19% | 1.39M | 13G | Apr 29, 2026 ↗ |
| Vanguard Portfolio Management | 5.12% | 1.37M | 13G | Apr 28, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % of company | Filed |
|---|---|---|---|---|
| Jay C. Horgen | director, officer: President and CEO | 238.8K | 0.90% | Jun 8, 2026 |
| Thomas M. Wojcik | officer: President and COO | 159.5K | 0.60% | Mar 9, 2026 |
| Kavita Padiyar | officer: General Counsel & Corp. Sec. | 42.7K | 0.16% | Mar 9, 2026 |
| Cheerag B. Patel | officer: Head of Affiliate Engagement | 39.7K | 0.15% | Apr 24, 2026 |
| Dwight D. Churchill | director | 29.0K | 0.11% | Aug 18, 2025 |
| Tracy P. Palandjian | director | 18.4K | 0.07% | Aug 18, 2026 |
| Karen L. Alvingham | director | 13.0K | 0.05% | Mar 9, 2026 |
| G. Staley Cates | director | 6.4K | 0.02% | May 6, 2026 |
| Rodriguez Felix V. Matos | director | 5.0K | 0.02% | Aug 18, 2026 |
| Loren M. Starr | director | 2.7K | 0.01% | Aug 18, 2026 |
16 people have not refiled in the last 18 months (848.7K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 8, 2026 | Jay C. Horgendirector, officer: President and CEO | Sale | 17,500 | $338.27 | 204,706 |
| May 6, 2026 | David Christopher Ryandirector | Sale | 3,402 | $305.06 | 1,092 |
| May 8, 2026 | Rodriguez Felix V. Matosdirector | Sale | 1,000 | $300.18 | 4,369 |
| May 6, 2026 | G. Staley Catesdirector | Purchase | 1,500 | $305.83 | 6,405 |
| Mar 9, 2026 | Kavita Padiyarofficer: General Counsel & Corp. Sec. | Sale | 2,200 | $278.24 | 42,672 |
| Mar 6, 2026 | Thomas M. Wojcikofficer: President and COO | Sale | 8,000 | $286.30 | 159,465 |
| Sep 9, 2025 | Thomas M. Wojcikofficer: President and COO | Sale | 16,000 | $231.03 | 158,710 |
CongressHouse and Senate disclosures
Not reported.