Acadian Asset Management Inc.
US ˙ NYSE ˙ US10948W1036

SecurityAAMI / Acadian Asset Management Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership15,530 shares
Latest Disclosed Value $ 845,142
Citigroup Inc reports 63.76% decrease in ownership of AAMI / Acadian Asset Management Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 15,530 shares of Acadian Asset Management Inc. (US:AAMI) valued at $845,143 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 42,850 shares of Acadian Asset Management Inc.. This represents a change in shares of -63.76% during the quarter. The current value of the position is $1,122,198 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 ACADIAN ASSET MANAGEMENT COM 10948W103 15,530 -27,320 -63.76 845 -58.02 0.0004
2026-02-13 2025-12-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 42,850 -8,181 -16.03 2,014 -18.07 0.0009
2025-11-10 2025-09-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 51,031 26,252 105.94 2,458 181.44 0.0011
2025-08-11 2025-06-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 24,779 -14,857 -37.48 873 -14.75 0.0004
2025-05-12 2025-03-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 39,636 -802 -1.98 1,025 -3.85 0.0005
2025-02-12 2024-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 40,438 5,029 14.20 1,065 18.46 0.0006
2024-11-12 2024-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 35,409 8,053 29.44 899 48.35 0.0005
2024-08-12 2024-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 27,356 6,327 30.09 606 26.25 0.0004
2024-05-10 2024-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 21,029 -33,306 -61.30 480 -53.89 0.0003
2024-02-09 2023-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 54,335 27,519 102.62 1,041 100.58 0.0007
2023-12-06 2023-09-30 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 26,816 -22,457 -45.58 520 -49.71 0.0004
2023-11-09 2023-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 26,816 -22,457 520 0.0002
2023-08-10 2023-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 49,273 27,347 124.72 1,032 99.61 0.0007
2023-05-11 2023-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 21,926 -3,480 -13.70 517 -0.96 0.0004
2023-02-09 2022-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 25,406 4,076 19.11 523 64.15 0.0004
2022-11-10 2022-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 21,330 1,063 5.24 318 -12.88 0.0002
2022-08-10 2022-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 20,267 -16,718 -45.20 365 -59.31 0.0003
2022-05-12 2022-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 36,985 -7,781 -17.38 897 -21.73 0.0005
2022-02-10 2021-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 44,766 1,781 4.14 1,146 2.05 0.0006
2021-11-10 2021-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 42,985 -17,446 -28.87 1,123 -20.69 0.0007
2021-08-10 2021-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 60,431 12,574 26.27 1,416 45.23 0.0009
2021-05-13 2021-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 47,857 -27,567 -36.55 975 -32.94 0.0006
2021-02-11 2020-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 75,424 44,573 144.48 1,454 265.33 0.0009
2020-11-12 2020-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 30,851 -30,146 -49.42 398 -47.63 0.0003
2020-08-12 2020-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 60,997 -364,245 -85.66 760 -72.04 0.0006
2020-05-12 2020-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 425,242 363,863 592.81 2,718 333.49 0.0025
2020-02-12 2019-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 61,379 42,375 222.98 627 233.51 0.0005
2019-11-08 2019-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 19,004 -1,659 -8.03 188 -20.00 0.0001
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.