Acadian Asset Management Inc.
US ˙ NYSE ˙ US10948W1036

SecurityAAMI / Acadian Asset Management Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership904,549 shares
Latest Disclosed Value $ 49,220,398
Dimensional Fund Advisors Lp reports 0.51% decrease in ownership of AAMI / Acadian Asset Management Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 904,549 shares of Acadian Asset Management Inc. (US:AAMI) valued at $49,225,557 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 909,213 shares of Acadian Asset Management Inc.. This represents a change in shares of -0.51% during the quarter. The current value of the position is $66,936,626 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 ACADIAN ASSET MANAGEMENT COM 10948W103 904,549 -4,664 -0.51 49,220 15.18 0.0102
2026-02-12 2025-12-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 909,213 -44,169 -4.63 42,734 -6.93 0.0090
2025-11-12 2025-09-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 953,382 -23,397 -2.40 45,917 33.39 0.0099
2025-08-12 2025-06-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 976,779 -85,240 -8.03 34,422 25.34 0.0080
2025-05-13 2025-03-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 1,062,019 -50,043 -4.50 27,463 -6.24 0.0068
2025-02-13 2024-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,112,062 -1,696 -0.15 29,292 3.54 0.0070
2024-11-07 2024-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,113,758 -13,014 -1.15 28,289 13.25 0.0069
2024-08-09 2024-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,126,772 4,399 0.39 24,980 -2.56 0.0065
2024-05-10 2024-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,122,373 6,392 0.57 25,635 19.89 0.0069
2024-02-07 2023-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,115,981 -1,541 -0.14 21,382 -1.32 0.0062
2023-11-09 2023-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,117,522 -43,513 -3.75 21,669 -10.91 0.0071
2023-08-09 2023-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,161,035 14,360 1.25 24,324 -10.04 0.0078
2023-05-12 2023-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,146,675 15,921 1.41 27,038 117,456.52 0.0091
2023-02-09 2022-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,130,754 8,639 0.77 23 -99.86 0.0069
2022-11-10 2022-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,122,115 1,995 0.18 16,731 -17.07 0.0064
2022-08-12 2022-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,120,120 19,184 1.74 20,174 -24.44 0.0072
2022-05-13 2022-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,100,936 -83,676 -7.06 26,698 -11.97 0.0082
2022-02-09 2021-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 1,184,612 -888,869 -42.87 30,327 -44.03 0.0092
2021-11-12 2021-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,073,481 -7,827 -0.38 54,180 11.10 0.0175
2021-08-12 2021-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,081,308 -50,624 -2.37 48,766 12.25 0.0154
2021-05-14 2021-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,131,932 -44,584 -2.05 43,444 3.53 0.0144
2021-03-08 2020-12-31 13F/A-2 BRIGHTSPHERE INVT GROUP COM 10948W103 2,176,516 -28,924 -1.31 41,963 47.50 0.0152
2021-02-11 2020-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,176,516 -28,924 41,963 15,154.8051
2020-11-12 2020-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,205,440 -20,246 -0.91 28,450 2.59 0.0121
2020-08-13 2020-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,225,686 624 0.03 27,733 95.06 0.0122
2020-05-14 2020-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,225,062 -12,054 -0.54 14,218 -37.81 0.0074
2020-02-14 2019-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,237,116 -63,732 -2.77 22,863 0.27 0.0083
2019-11-12 2019-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 2,300,848 2,300,848 22,802 0.0089
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.