Data from public SEC 13F & STOCK Act filings, delayed up to ~45 days, partial holdings only — for research, not investment advice.
AMG
AFFILIATED MANAGERS GROUPData as of 2026 Q1 (03-31) · 13F snapshot
Summary
AFFILIATED MANAGERS GROUP (AMG) is held by 8 tracked hedge-fund managers, a combined reported value of ~$175.29M; the largest are Ken Griffin, Zhang Lei, Renaissance Technologies. This quarter: 1 new, 1 added, 3 trimmed. 11 members of Congress have disclosed STOCK Act trades. Data as of 2026 Q1, from public SEC 13F filings, delayed up to ~45 days.
Attention · HighThis quarter · Mixed
Gurus holding8
Congress trades11
Price$354.62vs quarter-end+28.16%
Sectors0
This quarter's moves
Top holderKen GriffinNew1
Added1
Trimmed / sold3
Zhang LeiHold
Value $55.12M0.9% of portfolio335,0732021 Q4
Value $2.57M— of portfolio9,3002026 Q1
Value $1.58M— of portfolio5,7002026 Q1
Value $515.6K— of portfolio2,9002024 Q3
Value $408.9K— of portfolio2,3002024 Q3
| Investor | Value | % of portfolio | Action |
|---|---|---|---|
| Zhang Lei | $55.12M | 0.9% | Hold |
| Ken GriffinCALL | $2.57M | — | — |
| Ken GriffinPUT | $1.58M | — | — |
| Izzy EnglanderPUT | $515.6K | — | — |
| Izzy EnglanderCALL | $408.9K | — | — |