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 1.71M · Bought 52.0K · Sold 454.8K
Granted 546.8K · Bought 3.0K · Sold 8.6K
Granted 1.72M · Sold 1.21M
Granted 2.17M · Sold 1.58M
Granted 506.1K · Bought 1.4K · Sold 28.8K
Granted 1.74M · Sold 1.72M
Granted 63.7K · Bought 3.0K
Granted 82.9K · Sold 2.2K
Granted 28.1K · Sold 15.0K
Granted 234.3K · Sold 207.2K
Granted 4.4K · Bought 29.9K
Granted 37.7K · Bought 7.5K · Sold 12.5K
Granted 16.0K · Bought 11.6K · Sold 5.7K
Granted 10.0K · Sold 10.0K
Granted 38.2K
Granted 72.6K · Sold 57.0K
Granted 7.0K · Bought 4.4K · Sold 4.4K
Granted 22.3K · Bought 3.7K · Sold 1.7K
Granted 31.6K · Sold 10.0K
Granted 459.0K · Sold 382.8K
Granted 77.8K · Sold 65.3K
Granted 78.3K · Sold 70.6K
Granted 18.8K
Bought 1.5K
Granted 5.4K · Sold 1.0K
Granted 2.6K · Bought 1.5K
Granted 739.4K · Sold 738.8K
Granted 559
Granted 1.2K · Bought 750
Granted 1.9K
Granted 88.1K · Sold 93.1K
Granted 4.5K · Sold 3.4K
Granted 439
Granted 601
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Horgen Jay C.President and CEO, Director · 129 transactions | — | 1.36M | 1.71M | 52.0K | 454.8K |
| Jamal Rizwan MHead of Affiliate Investments · 29 transactions | — | 407.1Kas of Oct 2024 | 546.8K | 3.0K | 8.6K |
| Dalton NathanielDirector · 105 transactions | — | 210.9Kas of Mar 2020 | 1.72M | — | 1.21M |
| Healey Sean MExecutive Chairman, Director · 101 transactions | — | 168.0Kas of Mar 2020 | 2.17M | — | 1.58M |
| Wojcik Thomas MPresident and COO · 40 transactions | — | 159.5K | 506.1K | 1.4K | 28.8K |
| Nutt William JDirector · 113 transactions | — | 131.5Kas of May 2015 | 1.74M | — | 1.72M |
| 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 |
| Floor Richard EDirector · 6 transactions | — | 42.3Kas of Jan 2010 | 28.1K | — | 15.0K |
| Brennan Seth WExecutive Vice President · 12 transactions | — | 37.0Kas of Nov 2006 | 234.3K | — | 207.2K |
| Jeffery Reuben IIIDirector · 18 transactions | — | 34.3Kas of Jan 2025 | 4.4K | 29.9K | — |
| Churchill Dwight D.Director · 41 transactions | — | 29.0Kas of Aug 2025 | 37.7K | 7.5K | 12.5K |
| Byrne Samuel TDirector · 11 transactions | — | 28.1Kas of Feb 2020 | 16.0K | 11.6K | 5.7K |
| MacEwen Peter WChief Administrative Officer · 3 transactions | — | 26.1Kas of Jan 2018 | 10.0K | — | 10.0K |
| Billings David M.General Counsel and Secretary · 31 transactions | — | 26.0Kas of Nov 2022 | 38.2K | — | — |
| Zeitlin Jide JamesDirector · 15 transactions | — | 23.9Kas of Dec 2019 | 72.6K | — | 57.0K |
| Cutler HughEVP, Global Distribution · 12 transactions | — | 19.3Kas of Mar 2020 | 7.0K | 4.4K | 4.4K |
| Palandjian Tracy P.Director · 32 transactions | — | 18.2K | 22.3K | 3.7K | 1.7K |
| Dyson AndrewEVP(AMG Ltd.), Global Distrib. · 12 transactions | — | 18.1Kas of Mar 2016 | 31.6K | — | 10.0K |
| Kingston John IIIVice Chairman & Gen. Counsel · 58 transactions | — | 15.3Kas of May 2014 | 459.0K | — | 382.8K |
| Rodriguez Rita MDirector · 20 transactions | — | 14.7Kas of May 2013 | 77.8K | — | 65.3K |
| Ryan Patrick TDirector · 20 transactions | — | 13.3Kas of Nov 2019 | 78.3K | — | 70.6K |
| Alvingham Karen L.Director · 34 transactions | — | 13.0K | 18.8K | — | — |
| 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 · 9 transactions | — | 4.0Kas of Mar 2024 | 2.6K | 1.5K | — |
| Crate Darrell WExecutive V.P. and CFO · 50 transactions | — | 3.1Kas of Feb 2011 | 739.4K | — | 738.8K |
| Earle GlennDirector · 10 transactions | — | 2.1Kas of Jan 2021 | 559 | — | — |
| Franqui AnnetteDirector · 3 transactions | — | 2.0K | 1.2K | 750 | — |
| Starr Loren MDirector · 3 transactions | — | 1.9K | 1.9K | — | — |
| Meyerman Harold JDirector · 23 transactions | — | 1.8Kas of May 2014 | 88.1K | — | 93.1K |
| Ryan David ChristopherDirector · 9 transactions | — | 1.1K | 4.5K | — | 3.4K |
| Yerburgh KarenDirector · 4 transactions | — | 837as of Jan 2021 | 439 | — | — |
| 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 all recorded history: -6.57M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.