Latest Period
Q1 2026
Security Snapshot
Acadian Asset Management Inc. - Common Stock (AAMI) Institutional Ownership
CUSIP: 10948W103
13F Institutional Holders and Ownership History from Q2 2019 to Q1 2026
Institutions Reporting
253
Shares (Excl. Options)
35,950,875
Price
$54.42
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- Security type / class
- Equity / Common Stock
- Symbol
- AAMI on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 35,950,875
- Total 13F value
- $1,956,672,369
- Portfolio coverage rank
- 0%
- Share change
- +615,401
- Value change
- +$39,447,644
- Number of holders
- 253
- Shares outstanding
- 35,355,963
- SEC-reported price per share
- $61.86
- Insider filing price
- $61.86
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- AAMI - Acadian Asset Management Inc. - Common Stock is tracked under CUSIP 10948W103.
- 253 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 255 to 253 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $1,666,254,479 to $1,956,672,369.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 253 institutions filings for Q1 2026.
Security key
10948W103
Latest holder period
Q1 2026
13F holders
253
13D/G owners
6
CIK / CUSIP context first
Open Q1 2026 holders
AAMI full holder history
Acadian Asset Management Inc. SEC filings
Acadian Asset Management Inc. company facts
Acadian Asset Management Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 10948W103:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
AAMI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| PAULSON & CO. INC. | 22% | $306,479,102 | 7,743,282 | PAULSON & CO. INC. | 03 Sep 2025 | |||
| BlackRock, Inc. | 11% | -23% | $113,935,282 | -$34,617,734 | 4,230,794 | -23% | BlackRock, Inc. | 31 Mar 2025 |
| PRUDENTIAL FINANCIAL INC | 5.9% | $80,821,022 | 2,127,989 | PRUDENTIAL FINANCIAL INC | 30 Jun 2025 | |||
| JENNISON ASSOCIATES LLC | 5.4% | +12% | $89,733,434 | +$8,430,860 | 1,909,222 | +10% | Jennison Associates LLC | 31 Dec 2025 |
| Azora Capital LP | 4.2% | -24% | $42,168,771 | -$12,454,910 | 1,565,866 | -23% | Azora Capital LP | 31 Dec 2024 |
| Empyrean Capital Partners, LP | 4.3% | $74,219,761 | 1,541,108 | Empyrean Capital Partners, LP | 30 Sep 2025 |
As of 31 Mar 2026, 253 institutional investors reported holding 35,950,875 shares of Acadian Asset Management Inc. - Common Stock (AAMI). This represents 102% of the company’s total 35,355,963 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
81%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| PAULSON & CO. INC. | 22% | 7,743,282 | 0% | 14% | $421,389,406 |
| BlackRock, Inc. | 13% | 4,574,232 | -1.7% | 0% | $248,929,724 |
| JENNISON ASSOCIATES LLC | 5.7% | 2,022,207 | +5.9% | 0.08% | $110,048,506 |
| Empyrean Capital Partners, LP | 3.7% | 1,308,190 | -6.9% | 2.4% | $71,191,700 |
| STATE STREET CORP | 3.4% | 1,209,440 | +0.26% | 0% | $65,817,725 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.3% | 1,158,887 | 0% | 0% | $63,066,631 |
| DIMENSIONAL FUND ADVISORS LP | 2.6% | 904,549 | -0.51% | 0.01% | $49,220,398 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2.5% | 883,909 | 0% | 0% | $48,102,328 |
| Impax Asset Management Group plc | 2.3% | 823,323 | -2.6% | 0.31% | $44,805,238 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 747,822 | +9.1% | 0% | $40,702,111 |
| Woodline Partners LP | 2% | 701,720 | +26% | 0.14% | $38,187,602 |
| SOROS FUND MANAGEMENT LLC | 1.8% | 648,807 | -12% | 0.48% | $35,308,077 |
| SG Americas Securities, LLC | 1.7% | 603,683 | +68% | 0.04% | $32,852,000 |
| Nuveen, LLC | 1.7% | 588,464 | -9.8% | 0.01% | $32,024,211 |
| FEDERATED HERMES, INC. | 1.6% | 568,320 | +1.8% | 0.05% | $30,927,975 |
| MORGAN STANLEY | 1.5% | 537,642 | +0.96% | 0% | $29,258,516 |
| TWO SIGMA INVESTMENTS, LP | 1.4% | 478,814 | +69% | 0.02% | $26,057,058 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3% | 453,320 | -5.6% | 0% | $24,669,674 |
| Allspring Global Investments Holdings, LLC | 1.2% | 419,239 | +14% | 0.04% | $23,561,231 |
| Invesco Ltd. | 1.2% | 412,702 | -1.9% | 0% | $22,459,243 |
| GW&K Investment Management, LLC | 1.1% | 375,977 | -9% | 0.18% | $20,461,000 |
| Systematic Alpha Investments, LLC | 1% | 370,108 | 0% | 0.74% | $20,141,280 |
| Azora Capital LP | 0.93% | 329,349 | 1.2% | $17,923,173 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 0.9% | 318,131 | -24% | 0.07% | $17,312,689 |
| Boston Trust Walden Corp | 0.8% | 281,604 | 0.13% | $15,324,890 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
28
Latest
Q1 2026
Rows shown
1-25 of 28
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 35,950,875 | $1,956,672,369 | +$39,447,644 | $54.42 | 253 |
| 2025 Q4 | 35,446,399 | $1,666,254,479 | +$22,805,652 | $47.00 | 255 |
| 2025 Q3 | 35,013,780 | $1,684,848,667 | -$35,902,068 | $48.16 | 247 |
| 2025 Q2 | 35,778,019 | $1,261,010,713 | +$1,582,222 | $35.24 | 213 |
| 2025 Q1 | 35,912,108 | $928,709,663 | -$47,957,442 | $25.86 | 190 |
| 2024 Q4 | 37,752,569 | $994,151,709 | +$13,331,289 | $26.34 | 177 |
| 2024 Q3 | 37,169,720 | $943,763,728 | -$18,137,073 | $25.40 | 171 |
| 2024 Q2 | 38,054,356 | $843,690,912 | -$24,328,051 | $22.17 | 164 |
| 2024 Q1 | 39,168,433 | $894,553,117 | -$39,556,496 | $22.84 | 168 |
| 2023 Q4 | 41,054,968 | $786,553,389 | -$2,826,463 | $19.16 | 169 |
| 2023 Q3 | 41,152,021 | $797,584,945 | -$2,468,747 | $19.39 | 161 |
| 2023 Q2 | 41,244,983 | $864,213,285 | -$10,762,873 | $20.95 | 155 |
| 2023 Q1 | 41,626,716 | $981,253,379 | -$13,037,587 | $23.58 | 163 |
| 2022 Q4 | 42,392,867 | $872,573,361 | +$4,358,738 | $20.58 | 142 |
| 2022 Q3 | 42,568,813 | $635,085,728 | -$9,035,943 | $14.91 | 147 |
| 2022 Q2 | 42,621,167 | $767,406,688 | -$54,429,253 | $18.01 | 148 |
| 2022 Q1 | 44,183,535 | $1,071,418,175 | -$68,689,496 | $24.25 | 155 |
| 2021 Q4 | 46,943,314 | $1,202,472,473 | -$832,842,752 | $25.60 | 177 |
| 2021 Q3 | 79,061,517 | $2,067,730,261 | +$6,713,987 | $26.13 | 175 |
| 2021 Q2 | 78,940,057 | $1,850,838,067 | -$15,155,001 | $23.43 | 163 |
| 2021 Q1 | 78,922,644 | $1,607,966,780 | -$11,281,488 | $20.38 | 167 |
| 2020 Q4 | 79,614,213 | $1,534,316,832 | -$27,079,923 | $19.28 | 164 |
| 2020 Q3 | 80,774,043 | $1,041,521,316 | -$14,529,395 | $12.90 | 150 |
| 2020 Q2 | 81,818,677 | $1,019,438,778 | +$21,132,761 | $12.46 | 138 |
| 2020 Q1 | 81,768,630 | $522,464,351 | -$18,281,434 | $6.39 | 119 |