Affiliated Managers Group, Inc.
A global asset management company that buys stakes in independent boutique investment firms — its "Affiliates" — while letting them keep running their own investment decisions and culture. Founded in Boston in 1993 by William J. Nutt, a former Boston Company Asset Management CEO, with backing from private equity firm TA Associates, the name reflects its model of "affiliating" with firms rather than absorbing them. Its partners have included AQR Capital Management, and it went public on the New York Stock Exchange in 1997.
Granted 971.2K · Bought 2.0K · Sold 35.8K
Granted 546.8K · Bought 3.0K · Sold 8.6K
Granted 498.5K · Sold 28.8K
Granted 63.7K · Bought 3.0K
Granted 82.9K · Sold 2.2K
Granted 3.9K · Bought 9.8K
Granted 20.0K
Granted 16.3K
Granted 19.6K · Bought 3.7K
Granted 18.4K
Bought 1.5K
Granted 5.4K · Sold 1.0K
Granted 2.6K
Granted 1.2K · Bought 750
Granted 1.9K
Granted 4.5K · Sold 3.4K
Granted 601
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Horgen Jay C.President and CEO, Director · 45 transactions | — | 1.36M | 971.2K | 2.0K | 35.8K |
| Jamal Rizwan MHead of Affiliate Investments · 29 transactions | — | 407.1Kas of Oct 2024 | 546.8K | 3.0K | 8.6K |
| Wojcik Thomas MPresident and COO · 34 transactions | +808.9% | 159.5K | 498.5K | — | 28.8K |
| Erickson John RHead of Affiliate Engagement · 15 transactions | — | 63.2Kas of Aug 2023 | 63.7K | 3.0K | — |
| Padiyar KavitaGeneral Counsel & Corp. Sec. · 11 transactions | — | 42.7K | 82.9K | — | 2.2K |
| Jeffery Reuben IIIDirector · 13 transactions | +67.2% | 34.3Kas of Jan 2025 | 3.9K | 9.8K | — |
| Churchill Dwight D.Director · 19 transactions | +95% | 29.0Kas of Aug 2025 | 20.0K | — | — |
| Billings David M.General Counsel and Secretary · 7 transactions | +82.2% | 26.0Kas of Nov 2022 | 16.3K | — | — |
| Palandjian Tracy P.Director · 27 transactions | +332.7% | 18.2K | 19.6K | 3.7K | — |
| Alvingham Karen L.Director · 32 transactions | +1024.4% | 13.0K | 18.4K | — | — |
| Cates G. StaleyDirector · 1 transaction | — | 6.4K | — | 1.5K | — |
| Matos Rodriguez Felix V.Director · 10 transactions | — | 4.4K | 5.4K | — | 1.0K |
| Atkinson Tracy ADirector · 8 transactions | +173.7% | 4.0Kas of Mar 2024 | 2.6K | — | — |
| Franqui AnnetteDirector · 3 transactions | — | 2.0K | 1.2K | 750 | — |
| Starr Loren MDirector · 3 transactions | — | 1.9K | 1.9K | — | — |
| Ryan David ChristopherDirector · 9 transactions | — | 1.1K | 4.5K | — | 3.4K |
| Ritchea DavaChief Financial Officer · 2 transactions | — | 309 | 601 | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 5 years: -56.0K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.