Affiliated Managers Group, Inc. (AMG) Insider Trading
Over the last 3 months, AMG insiders made 1 open-market buy and 3 sales, a net sale of -$6.8M (SEC Form 4). Over the last 6 months, 376 institutions increased and 315 reduced their position (13F).
Insider Activity
Sentiment
5/100
Buys (3m)
1
Sells (3m)
3
Net (3m)
-$6.8M
Insiders buying
Insider trades by month Buys Sells
Aug
Sep
Mar
May
Jun
Context3-month price +22.3%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 15, 2026 | Palandjian Tracy P.director | Tax | 685 | $354.62 |
| Jun 15, 2026 | Palandjian Tracy P.director | Option | 2,958 | $82.07 |
| Jun 8, 2026 | Horgen Jay C.director, officer: President and CEO | Sell | 17,500 | $338.27 |
| Jun 8, 2026 | Horgen Jay C.director, officer: President and CEO | Option | 75,000 | $74.49 |
| Jun 8, 2026 | Horgen Jay C.director, officer: President and CEO | Tax | 39,671 | $336.62 |
| May 8, 2026 | Matos Rodriguez Felix V.director | Sell | 1,000 | $300.18 |
| May 8, 2026 | Ryan David Christopherdirector | Sell | 3,402 | $305.06 |
| May 6, 2026 | Cates G. Staleydirector | Buy | 1,500 | $305.83 |
| May 5, 2026 | Cates G. Staleydirector | Grant | 172 | — |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Option | 17,563 | — |
| Mar 9, 2026 | STARR LOREN Mdirector | Grant | 503 | — |
| Mar 9, 2026 | STARR LOREN Mdirector | Option | 652 | — |
| Mar 9, 2026 | Padiyar Kavitaofficer: General Counsel & Corp. Sec. | Grant | 1,191 | — |
| Mar 9, 2026 | Palandjian Tracy P.director | Option | 867 | — |
| Mar 9, 2026 | Matos Rodriguez Felix V.director | Option | 867 | — |
| Mar 9, 2026 | Padiyar Kavitaofficer: General Counsel & Corp. Sec. | Grant | 2,426 | — |
| Mar 9, 2026 | RITCHEA DAVAofficer: Chief Financial Officer | Tax | 292 | $299.18 |
| Mar 9, 2026 | STARR LOREN Mdirector | Grant | 257 | — |
| Mar 9, 2026 | Palandjian Tracy P.director | Grant | 335 | — |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Grant | 8,544 | — |
| Mar 9, 2026 | Alvingham Karen L.director | Grant | 171 | — |
| Mar 9, 2026 | Alvingham Karen L.director | Option | 867 | — |
| Mar 9, 2026 | Ryan David Christopherdirector | Grant | 335 | — |
| Mar 9, 2026 | Padiyar Kavitaofficer: General Counsel & Corp. Sec. | Option | 2,288 | — |
| Mar 9, 2026 | Engel Marcydirector | Grant | 335 | — |
| Mar 9, 2026 | RITCHEA DAVAofficer: Chief Financial Officer | Option | 601 | — |
| Mar 9, 2026 | Wojcik Thomas Mofficer: President and COO | Tax | 9,136 | $299.18 |
| Mar 9, 2026 | Padiyar Kavitaofficer: General Counsel & Corp. Sec. | Tax | 2,282 | $299.18 |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Grant | 27,260 | — |
| Mar 9, 2026 | Ryan David Christopherdirector | Option | 867 | — |
Source: AMG SEC Form 4 filings, latest Jun 15, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their AMG positions over the last 6 months (SEC Form 13F).
Increased
376
New positions
179
Reduced
315
Sold out
79
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 2.9M | May 13, 2026 |
| BLACKROCK, INC. | Reduced | 2.8M | Feb 12, 2026 |
| VANGUARD GROUP INC | Reduced | 2.7M | Jan 29, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.3M | May 15, 2026 |
| MORGAN STANLEY | Reduced | 1.7M | May 15, 2026 |
| MORGAN STANLEY | Reduced | 1.7M | Feb 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 1.4M | May 8, 2026 |
| ARIEL INVESTMENTS, LLC | Reduced | 1.2M | Feb 13, 2026 |
| BOSTON PARTNERS | Reduced | 1.1M | Feb 13, 2026 |
| ARIEL INVESTMENTS, LLC | Reduced | 1.1M | May 14, 2026 |
| BOSTON PARTNERS | Reduced | 971K | May 11, 2026 |
| STATE STREET CORP | Reduced | 929K | Feb 13, 2026 |
| STATE STREET CORP | Reduced | 927K | May 15, 2026 |
| CLARKSTON CAPITAL PARTNERS, LLC | Reduced | 904K | Feb 13, 2026 |
| MILLENNIUM MANAGEMENT LLC | Reduced | 796K | Feb 17, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.