Affiliated Managers Group, Inc.
US ˙ NYSE ˙ US0082521081

SecurityAMG / Affiliated Managers Group, Inc.
InstitutionMan Group plc
Latest Disclosed Ownership90,548 shares
Latest Disclosed Value $ 25,054,632
Man Group plc reports 7.37% increase in ownership of AMG / Affiliated Managers Group, Inc.

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 90,548 shares of Affiliated Managers Group, Inc. (US:AMG) valued at $25,054,632 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 84,334 shares of Affiliated Managers Group, Inc.. This represents a change in shares of 7.37% during the quarter. The current value of the position is $28,215,662 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 90,548 6,214 7.37 25,055 3.06 0.0455
2026-02-17 2025-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 84,334 5,350 6.77 24,312 29.09 0.0413
2025-11-14 2025-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 78,984 4,907 6.62 18,832 29.20 0.0327
2025-08-14 2025-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 74,077 5,855 8.58 14,576 27.16 0.0278
2025-05-15 2025-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 68,222 1,235 1.84 11,463 -7.46 0.0291
2025-02-14 2024-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 66,987 -22,193 -24.89 12,387 -21.88 0.0326
2024-11-14 2024-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 89,180 -44,218 -33.15 15,856 -23.92 0.0413
2024-08-14 2024-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 133,398 42,338 46.49 20,841 36.66 0.0526
2024-05-15 2024-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 91,060 6,848 8.13 15,250 19.59 0.0384
2024-02-14 2023-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 84,212 12,751 13.04 0.0355
2023-11-14 2023-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 11,281 -27.82 0.0349
2023-08-14 2023-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 104,261 15,628 -1.53 0.0482
2023-05-15 2023-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 15,870 18.96 0.0564
2023-02-14 2022-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 84,208 17,567 26.36 13,341 79.00 0.0478
2022-11-14 2022-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 66,641 7,453 3.40 0.0346
2022-08-15 2022-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 7,208 -2.79 0.0305
2022-05-16 2022-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 52,600 -9,781 -15.68 7,415 -27.74 0.0258
2022-02-14 2021-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 62,381 -4,477 -6.70 10,262 1.58 0.0330
2021-11-15 2021-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 66,858 -2,515 -3.63 10,102 -5.57 0.0354
2021-08-16 2021-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 69,373 21,205 44.02 10,698 49.04 0.0377
2021-05-17 2021-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 48,168 42,188 705.48 7,178 1,080.59 0.0316
2021-02-16 2020-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 5,980 2,254 60.49 608 138.43 0.0027
2020-11-16 2020-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 3,726 3,726 255 0.0010
2020-05-15 2020-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 0 -89,007 -100.00 0 -100.00
2020-02-18 2019-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 89,007 89,007 7,543 0.0248
2019-11-14 2019-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 0 -3,327 -100.00 0 -100.00
2019-08-14 2019-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 3,327 -91,452 -96.49 307 -96.98 0.0011
2019-05-15 2019-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 94,779 -28,110 -22.87 10,152 -15.22 0.0385
2019-02-14 2018-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 122,889 -11,320 -8.43 11,974 -34.74 0.0533
2018-11-14 2018-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 134,209 -67,041 -33.31 18,348 -38.68 0.0670
2018-08-14 2018-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 201,250 183,769 1,051.25 29,920 802.84 0.1231
2018-05-15 2018-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 17,481 17,481 3,314 0.0152
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.