Affiliated Managers Group, Inc.
DE ˙ DB ˙ US0082521081
270,00 € ↑14,00 (5,47%)
2026-06-04
CENA AKCJI
SecurityDE:AFS / Affiliated Managers Group, Inc.
InstitutionBoston Partners
Latest Disclosed Ownership971,247 shares
Latest Disclosed Value $ 268,714,497
Boston Partners reports 14.56% decrease in ownership of AFS / Affiliated Managers Group, Inc.

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 971,247 shares of Affiliated Managers Group, Inc. (DE:AFS) valued at $229,214,292 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,136,710 shares of Affiliated Managers Group, Inc.. This represents a change in shares of -14.56% during the quarter. The current value of the position is $262,236,690 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)
2026-05-11 2026-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 971,247 -165,463 -14.56 268,714 -18.01 0.2815
2026-02-13 2025-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 1,136,710 -20,634 -1.78 327,757 18.77 0.3394
2025-11-13 2025-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 1,157,344 24,217 2.14 275,957 23.74 0.2833
2025-08-12 2025-06-30 13F/A-1 AFFILIATED MANAGERS GROUP IN COM 008252108 1,133,127 -21,664 -1.88 223,011 14.95 0.2477
2025-08-07 2025-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 1,133,127 -21,664 223,011 0.1024
2025-05-13 2025-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 1,154,791 -29,339 -2.48 194,012 -11.40 0.2346
2025-02-11 2024-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 1,184,130 373,696 46.11 218,975 51.94 0.2663
2024-11-12 2024-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 810,434 89,646 12.44 144,120 27.96 0.1701
2024-08-14 2024-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 720,788 720,788 112,628 0.1399
2019-02-07 2018-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 0 -17,868 -100.00 0 -100.00
2018-11-14 2018-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 17,868 -500 -2.72 2,443 -10.55 0.0028
2018-08-03 2018-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 18,368 -10,587 -36.56 2,731 -50.25 0.0033
2018-05-04 2018-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 28,955 -1,566 -5.13 5,489 -12.37 0.0066
2018-02-14 2017-12-31 13F/A-1 AFFILIATED MANAGERS GROUP COM 008252108 30,521 0 0.00 6,264 8.11 0.0074
2018-02-01 2017-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 30,521 0 6,264
2017-11-02 2017-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 30,521 0 0.00 5,794 14.46 0.0072
2017-08-02 2017-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 30,521 0 0.00 5,062 1.16 0.0064
2017-05-03 2017-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 30,521 -5,044 -14.18 5,004 -3.17 0.0064
2017-02-06 2016-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 35,565 10,601 42.47 5,168 43.08 0.0068
2016-11-09 2016-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 24,964 0 0.00 3,612 2.79 0.0051
2016-08-05 2016-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 24,964 24,964 19.62 3,514 -7.82 0.0051
2014-02-06 2013-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 0 -20,870 -100.00 0 -100.00
2013-11-12 2013-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 20,870 -15,061 -41.92 3,812 -35.29 0.0092
2013-08-01 2013-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 35,931 35,931 5,891 0.0162
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.