Affiliated Managers Group, Inc.
US ˙ NYSE ˙ US0082521081

SecurityAMG / Affiliated Managers Group, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership718,313 shares
Latest Disclosed Value $ 198,745,831
Dimensional Fund Advisors Lp reports 2.70% increase in ownership of AMG / Affiliated Managers Group, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 718,313 shares of Affiliated Managers Group, Inc. (US:AMG) valued at $198,757,207 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 699,448 shares of Affiliated Managers Group, Inc.. This represents a change in shares of 2.70% during the quarter. The current value of the position is $241,935,002 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)
2026-05-07 2026-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 718,313 18,865 2.70 198,746 -1.44 0.0413
2026-02-12 2025-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 699,448 15,332 2.24 201,640 23.62 0.0423
2025-11-12 2025-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 684,116 7,891 1.17 163,113 22.58 0.0350
2025-08-12 2025-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 676,225 -33,141 -4.67 133,065 11.64 0.0308
2025-05-13 2025-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 709,366 -51,832 -6.81 119,189 -15.33 0.0296
2025-02-13 2024-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 761,198 -20,853 -2.67 140,763 1.23 0.0338
2024-11-07 2024-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 782,051 -44,072 -5.33 139,045 7.73 0.0337
2024-08-09 2024-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 826,123 30,059 3.78 129,065 -3.19 0.0337
2024-05-10 2024-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 796,064 24,960 3.24 133,317 14.18 0.0361
2024-02-07 2023-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 771,104 6,265 0.82 116,764 17.12 0.0341
2023-11-09 2023-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 764,839 -43,169 -5.34 99,695 -17.69 0.0327
2023-08-09 2023-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 808,008 16,118 2.04 121,115 7.40 0.0386
2023-05-12 2023-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 791,890 12,771 1.64 112,775 91,586.18 0.0380
2023-02-09 2022-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 779,119 2,095 0.27 123 -99.86 0.0365
2022-11-10 2022-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 777,024 18,467 2.43 86,915 -1.73 0.0334
2022-08-12 2022-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 758,557 7,726 1.03 88,446 -16.44 0.0317
2022-05-13 2022-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 750,831 16,444 2.24 105,843 -12.39 0.0326
2022-02-09 2021-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 734,387 -6,198 -0.84 120,813 7.96 0.0365
2021-11-12 2021-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 740,585 -2,057 -0.28 111,903 -2.29 0.0360
2021-08-12 2021-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 742,642 -22,770 -2.97 114,521 0.40 0.0363
2021-05-14 2021-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 765,412 -1,574 -0.21 114,069 46.24 0.0377
2021-03-08 2020-12-31 13F/A-2 AFFILIATED MANAGERS GROUP IN COM 008252108 766,986 -22,487 -2.85 78,001 44.50 0.0282
2021-02-11 2020-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 766,986 -22,487 78,001 28,169.8152
2020-11-12 2020-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 789,473 12,637 1.63 53,981 -6.79 0.0229
2020-08-13 2020-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 776,836 57,549 8.00 57,912 36.13 0.0255
2020-05-14 2020-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 719,287 62,322 9.49 42,542 -23.58 0.0222
2020-02-14 2019-12-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 656,965 105,255 19.08 55,671 21.07 0.0203
2019-11-12 2019-09-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 551,710 155,414 39.22 45,984 25.94 0.0179
2019-08-13 2019-06-30 13F AFFILIATED MANAGERS GROUP IN COM 008252108 396,296 38,029 10.61 36,514 -4.84 0.0142
2019-08-12 2019-03-31 13F/A-2 AFFILIATED MANAGERS GROUP IN COM 008252108 358,267 14,030 4.08 38,373 14.41 0.0153
2019-05-10 2019-03-31 13F AFFILIATED MANAGERS GROUP IN COM 008252108 358,267 14,030 38,373
2019-02-26 2018-12-31 13F/A-1 AFFILIATED MANAGERS GROUP COM 008252108 344,237 46,000 15.42 33,541 -17.75 0.0152
2019-02-13 2018-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 344,237 46,000 33,541
2018-11-13 2018-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 298,237 1,611 0.54 40,777 -7.55 0.0155
2018-08-10 2018-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 296,626 3,423 1.17 44,106 -20.65 0.0176
2018-05-11 2018-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 293,203 -2,076 -0.70 55,585 -8.29 0.0232
2018-02-12 2017-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 295,279 129 0.04 60,610 8.18 0.0251
2017-11-13 2017-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 295,150 -83 -0.03 56,028 14.42 0.0245
2017-08-11 2017-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 295,233 767 0.26 48,967 1.44 0.0226
2017-05-12 2017-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 294,466 13,943 4.97 48,273 18.44 0.0231
2017-02-09 2016-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 280,523 -8,792 -3.04 40,759 -2.62 0.0204
2016-11-10 2016-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 289,315 14,328 5.21 41,857 8.13 0.0226
2016-08-09 2016-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 274,987 35,130 14.65 38,709 -0.63 0.0223
2016-05-13 2016-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 239,857 12,661 5.57 38,953 7.31 0.0233
2016-02-10 2015-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 227,196 8,481 3.88 36,298 -2.93 0.0226
2015-11-13 2015-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 218,715 20,399 10.29 37,395 -13.75 0.0245
2015-08-14 2015-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 198,316 51,244 34.84 43,355 37.25 0.0265
2015-05-14 2015-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 147,072 27,691 23.20 31,588 24.66 0.0199
2015-02-06 2014-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 119,381 20,206 20.37 25,339 27.51 0.0166
2014-11-13 2014-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 99,175 -11,325 -10.25 19,872 -12.43 0.0141
2014-08-08 2014-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 110,500 -736 -0.66 22,693 2.06 0.0158
2014-05-14 2014-03-31 13F AFFILIATED MANAGERS GROUP COM 008252108 111,236 600 0.54 22,235 -7.33 0.0166
2014-02-12 2013-12-31 13F AFFILIATED MANAGERS GROUP COM 008252108 110,636 -1,616 -1.44 23,993 17.03 0.0187
2013-11-13 2013-09-30 13F AFFILIATED MANAGERS GROUP COM 008252108 112,252 3,402 3.13 20,501 14.90 0.0177
2013-08-15 2013-06-30 13F AFFILIATED MANAGERS GROUP COM 008252108 108,850 108,850 17,842 0.0168
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.