Affiliated Managers Group, Inc. (AMG) Insider Trading
Over the last 3 months, AMG insiders made 0 open-market buys and 1 sale, a net sale of -$5.9M (SEC Form 4). Over the last 6 months, 376 institutions increased and 362 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$5.9M
Insider trades by month Buys Sells
Aug
Sep
Mar
May
Jun
Context3-month price +22.6%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 18, 2026 | FRANQUI ANNETTEdirector | Option | 477 | — |
| Aug 18, 2026 | Palandjian Tracy P.director | Option | 848 | — |
| Aug 18, 2026 | Matos Rodriguez Felix V.director | Option | 654 | — |
| Aug 18, 2026 | STARR LOREN Mdirector | Option | 716 | — |
| Aug 3, 2026 | STARR LOREN Mdirector | Grant | 210 | — |
| Aug 3, 2026 | Palandjian Tracy P.director | Grant | 274 | — |
| Aug 3, 2026 | Engel Marcydirector | Grant | 274 | — |
| Aug 3, 2026 | Cates G. Staleydirector | Grant | 274 | — |
| Aug 3, 2026 | STARR LOREN Mdirector | Grant | 411 | — |
| Aug 3, 2026 | Matos Rodriguez Felix V.director | Grant | 274 | — |
| Aug 3, 2026 | FRANQUI ANNETTEdirector | Grant | 274 | — |
| 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 | Option | 75,000 | $74.49 |
| Jun 8, 2026 | Horgen Jay C.director, officer: President and CEO | Tax | 39,671 | $336.62 |
| Jun 8, 2026 | Horgen Jay C.director, officer: President and CEO | Sell | 17,500 | $338.27 |
| 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 | Padiyar Kavitaofficer: General Counsel & Corp. Sec. | Grant | 2,426 | — |
| Mar 9, 2026 | Matos Rodriguez Felix V.director | Option | 867 | — |
| Mar 9, 2026 | Wojcik Thomas Mofficer: President and COO | Sell | 8,000 | $286.30 |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Grant | 27,260 | — |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Tax | 18,333 | $299.18 |
| Mar 9, 2026 | FRANQUI ANNETTEdirector | Grant | 335 | — |
| Mar 9, 2026 | Ryan David Christopherdirector | Option | 867 | — |
| Mar 9, 2026 | Palandjian Tracy P.director | Option | 867 | — |
| Mar 9, 2026 | Horgen Jay C.director, officer: Chief Executive Officer | Grant | 8,544 | — |
| Mar 9, 2026 | RITCHEA DAVAofficer: Chief Financial Officer | Tax | 292 | $299.18 |
Source: AMG SEC Form 4 filings, latest Aug 18, 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
173
Reduced
362
Sold out
54
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 2.9M | May 13, 2026 |
| BlackRock, Inc. | Reduced | 2.8M | Aug 7, 2026 |
| MORGAN STANLEY | Reduced | 1.7M | May 15, 2026 |
| MORGAN STANLEY | Reduced | 1.5M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 1.4M | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 1.4M | May 8, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.2M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 1.2M | Aug 13, 2026 |
| ARIEL INVESTMENTS, LLC | Reduced | 1.1M | May 14, 2026 |
| Boston Partners | Increased | 1.0M | Aug 4, 2026 |
| ARIEL INVESTMENTS, LLC | Reduced | 1000K | Aug 14, 2026 |
| BOSTON PARTNERS | Reduced | 971K | May 11, 2026 |
| STATE STREET CORP | Reduced | 927K | May 15, 2026 |
| STATE STREET CORP | Reduced | 883K | Aug 7, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 875K | Aug 14, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.