아카디안 자산 관리 주식회사
US ˙ NYSE ˙ US10948W1036

SecurityAAMI / Acadian Asset Management Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership537,643 shares
Latest Disclosed Value $ 29,258,603
Morgan Stanley reports 0.96% increase in ownership of AAMI / Acadian Asset Management Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 537,643 shares of Acadian Asset Management Inc. (US:AAMI) valued at $29,258,532 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 532,515 shares of Acadian Asset Management Inc.. This represents a change in shares of 0.96% during the quarter. The current value of the position is $40,764,092 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 ACADIAN ASSET MANAGEMENT COM 10948W103 537,643 5,128 0.96 29,259 16.90 0.0018
2026-05-27 2025-12-31 13F/A-1 ACADIAN ASSET MANAGEMENT COM 10948W103 532,515 61,751 13.12 25,028 10.39 0.0015
2026-02-13 2025-12-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 532,515 61,751 25,028 0.0015
2026-05-27 2025-09-30 13F/A-1 ACADIAN ASSET MANAGEMENT COM 10948W103 470,764 21,815 4.86 22,672 43.30 0.0014
2025-11-14 2025-09-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 470,764 21,815 22,672 0.0014
2025-08-15 2025-06-30 13F ACADIAN ASSET MANAGEMENT COM 10948W103 448,949 25,497 6.02 15,821 44.48 0.0010
2025-05-15 2025-03-31 13F ACADIAN ASSET MANAGEMENT COM 10948W103 423,452 -92,839 -17.98 10,950 -19.48 0.0008
2025-05-15 2024-12-31 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 516,291 38,384 8.03 13,599 12.04 0.0010
2025-02-14 2024-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 516,291 38,384 13,599 0.0010
2025-05-14 2024-09-30 13F/A-2 BRIGHTSPHERE INVT GROUP COM 10948W103 477,907 66,981 16.30 12,139 33.24 0.0009
2025-02-14 2024-09-30 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 477,907 66,981 12,139 0.0009
2024-11-14 2024-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 477,907 66,981 12,139 0.0001
2025-05-14 2024-06-30 13F/A-2 BRIGHTSPHERE INVT GROUP COM 10948W103 410,926 -146,994 -26.35 9,110 -28.50 0.0007
2024-10-17 2024-06-30 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 410,926 -146,994 9,110 0.0007
2024-08-14 2024-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 410,926 -146,994 9,110 0.0007
2024-10-17 2024-03-31 13F/A-2 BRIGHTSPHERE INVT GROUP COM 10948W103 557,920 29,218 5.53 12,743 25.80 0.0010
2024-08-16 2024-03-31 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 557,920 29,218 12,743 0.0001
2024-05-15 2024-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 557,920 29,218 12,743 0.0010
2024-08-16 2023-12-31 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 528,702 141,296 36.47 10,130 34.86 0.0009
2024-02-13 2023-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 528,702 141,296 10,130 0.0009
2023-11-15 2023-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 387,406 -9,683 -2.44 7,512 -9.71 0.0008
2023-08-14 2023-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 397,089 58,266 17.20 8,319 4.13 0.0008
2023-05-15 2023-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 338,823 -3,855 -1.12 7,989 13.29 0.0009
2023-02-14 2022-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 342,678 9,507 2.85 7,052 41.95 0.0008
2022-11-14 2022-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 333,171 -97,021 -22.55 4,968 -35.90 0.0007
2022-10-27 2022-06-30 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 430,192 -77,041 -15.19 7,750 -36.99 0.0010
2022-08-15 2022-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 430,192 -77,041 7,750 0.0002
2022-10-27 2022-03-31 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 507,233 -159,278 -23.90 12,300 -27.91 0.0017
2022-05-13 2022-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 507,233 -159,278 12,300 0.0017
2022-02-14 2021-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 666,511 -83,531 -11.14 17,061 -12.95 0.0021
2021-11-15 2021-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 750,042 -1,705 -0.23 19,598 11.27 0.0026
2021-08-23 2021-06-30 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 751,747 366,581 95.17 17,613 124.40 0.0023
2021-08-16 2021-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 751,747 366,581 17,613 0.0005
2021-05-17 2021-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 385,166 -526,313 -57.74 7,849 -55.33 0.0012
2021-02-16 2020-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 911,479 694,555 320.18 17,573 528.06 0.0027
2020-11-13 2020-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 216,924 -16,135 -6.92 2,798 -3.65 0.0005
2020-08-14 2020-06-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 233,059 217,625 1,410.04 2,904 2,833.33 0.0006
2020-05-26 2020-03-31 13F/A-1 BRIGHTSPHERE INVT GROUP COM 10948W103 15,434 -83,461 -84.39 99 -90.21 0.0000
2020-05-15 2020-03-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 15,434 -83,461 99 7.6053
2020-02-14 2019-12-31 13F BRIGHTSPHERE INVT GROUP COM 10948W103 98,895 71,575 261.99 1,011 273.06 0.0002
2019-11-14 2019-09-30 13F BRIGHTSPHERE INVT GROUP COM 10948W103 27,320 27,320 271 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.