ACADIAN ASSET MANAGEMENT INC AAMI
COM · Common Stock · CUSIP 10948W103
- SectorFinancials
- IndustryInvestment Advice
- HeadquartersBoston, MA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($3.4m this quarter). Holder counts are more reliable. Shares outstanding: 35.5m as of 2026-08-04, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $71.50. Options: 3 managers hold calls ($3.2m notional), 0 hold puts (—).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 151 |
| Q4 2022 | 144 |
| Q1 2023 | 167 |
| Q2 2023 | 157 |
| Q3 2023 | 165 |
| Q4 2023 | 172 |
| Q1 2024 | 169 |
| Q2 2024 | 165 |
| Q3 2024 | 173 |
| Q4 2024 | 181 |
| Q1 2025 | 192 |
| Q2 2025 | 219 |
| Q3 2025 | 250 |
| Q4 2025 | 256 |
| Q1 2026 | 256 |
| Q2 2026 | 302 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 62 | 95 |
| Q4 2024 | 84 | 75 |
| Q1 2025 | 87 | 83 |
| Q2 2025 | 108 | 98 |
| Q3 2025 | 135 | 108 |
| Q4 2025 | 116 | 125 |
| Q1 2026 | 121 | 122 |
| Q2 2026 | 166 | 114 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $5.4m | $298.1k | 0.06 |
| Q4 2025 | $0 | $4.7k | — |
| Q1 2026 | $0 | $201.4k | — |
| Q2 2026 | $3.2m | $0 | 0.00 |
Biggest buyers
| Invesco Ltd. | Added | +963.8k |
| Driehaus Capital Management LLC | New | +788.9k |
| Avantyr Capital Partners, LP | New | +767.8k |
| Amundi | New | +317.3k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Added | +227.8k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +221.9k |
| Woodline Partners LP | Added | +181.8k |
| Azora Capital LP | Added | +166.7k |
| Allspring Global Investments Holdings, LLC | Added | +134.4k |
| AQR CAPITAL MANAGEMENT LLC | Added | +94.4k |
Biggest sellers
| PAULSON & CO. INC. | Reduced | -1.9m |
| SG Americas Securities, LLC | Reduced | -512.1k |
| JENNISON ASSOCIATES LLC | Reduced | -495.6k |
| Impax Asset Management Group plc | Reduced | -473.3k |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | -166.3k |
| North Reef Capital Management LP | Reduced | -133.6k |
| Qube Research & Technologies Ltd | Reduced | -119.1k |
| Man Group plc | Sold out | -118.1k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | -91.9k |
| Karl Kapital LLC | Sold out | -90.0k |
Biggest calls
| PEAK6 LLC | New | $2.9m40.0k shares |
| JANE STREET GROUP, LLC | New | $321.8k4.5k shares |
| SIMPLEX TRADING, LLC | New | $35.8k500 shares |
Biggest puts
| None |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| PAULSON & CO. INC. 13D · may seek influence -5.2 pts · filed 2026-06-22 | 16.4% |
| BlackRock, Inc. 13G · institution -3.5 pts · filed 2025-04-29 | 11.3% |
Fell to 5% or below in the last year: PRUDENTIAL FINANCIAL INC (4.5%, 2026-08-10), JENNISON ASSOCIATES LLC (4.3%, 2026-08-03), VANGUARD GROUP INC (0.0%, 2026-03-26), Empyrean Capital Partners, LP (4.3%, 2025-11-14)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 1 | $2.0m | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 2 | $2.0m | — |
| Q2 2026 | 0 | — | 1 | $6.7m | — |
| Q3 2026 | 0 | — | 1 | $2.2m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-08-04 | Wiater Christina PAO | Sold | $22.5k244 shares |
| 2026-08-03 | Wiater Christina PAO | Sold | $2.2m25.4k shares |
| 2026-06-17 | PAULSON & CO. INC. 10% owner · By Managed Funds | Sold | $146.8m1.9m shares |
| 2026-05-04 | Hart Richard Jonathan CLO and CAO | Sold | $6.7m100.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| PAULSON & CO. INC. 16.23% of their portfolio | 5.8m $417.9m | Reduced -1.9m |
| BlackRock, Inc. 0.00% of their portfolio | 4.5m $320.9m | Reduced -87.7k |
| JENNISON ASSOCIATES LLC 0.07% of their portfolio | 1.5m $109.2m | Reduced -495.6k |
| Invesco Ltd. 0.01% of their portfolio | 1.4m $98.4m | Added +963.8k |
| Empyrean Capital Partners, LP 3.29% of their portfolio | 1.3m $93.5m | Reduced -190 |
| STATE STREET CORP 0.00% of their portfolio | 1.2m $87.6m | Added +14.9k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.2m $84.1m | Added +17.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 969.7k $69.4m | Added +221.9k |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 911.7k $65.2m | Added +7.1k |
| Woodline Partners LP 0.20% of their portfolio | 883.5k $63.2m | Added +181.8k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 813.4k $58.2m | Reduced -70.6k |
| Driehaus Capital Management LLC 0.33% of their portfolio | 788.9k $56.4m | New |
| Avantyr Capital Partners, LP 2.02% of their portfolio | 767.8k $54.9m | New |
| MORGAN STANLEY 0.00% of their portfolio | 623.4k $44.6m | Added +85.8k |
| SOROS FUND MANAGEMENT LLC 0.57% of their portfolio | 610.2k $43.6m | Reduced -38.6k |
| Nuveen, LLC 0.01% of their portfolio | 602.4k $43.1m | Added +13.9k |
| FEDERATED HERMES, INC. 0.06% of their portfolio | 574.6k $41.1m | Added +6.3k |
| Allspring Global Investments Holdings, LLC 0.06% of their portfolio | 553.6k $39.8m | Added +134.4k |
| TWO SIGMA INVESTMENTS, LP 0.03% of their portfolio | 523.9k $37.5m | Added +45.1k |
| Azora Capital LP 1.49% of their portfolio | 496.0k $35.5m | Added +166.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 403.3k $28.8m | Reduced -50.0k |
| Systematic Alpha Investments, LLC 0.71% of their portfolio | 370.1k $26.5m | Unchanged |
| GW&K Investment Management, LLC 0.21% of their portfolio | 368.9k $26.4m | Reduced -7.0k |
| Impax Asset Management Group plc 0.16% of their portfolio | 350.0k $25.0m | Reduced -473.3k |
| Amundi 0.01% of their portfolio | 317.3k $22.7m | New |
| NORTHERN TRUST CORP 0.00% of their portfolio | 303.1k $21.7m | Added +24.1k |
| Boston Trust Walden Corp 0.15% of their portfolio | 268.7k $19.2m | Reduced -12.9k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 254.1k $18.2m | Added +94.4k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.03% of their portfolio | 249.1k $17.8m | Added +227.8k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 244.6k $17.5m | Added +25.3k |
| FMR LLC 0.00% of their portfolio | 231.2k $16.5m | Added +18.2k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.04% of their portfolio | 207.8k $14.9m | Reduced -55.9k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 204.9k $14.7m | Added +8.7k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 197.0k $14.1m | Reduced -7.5k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 194.9k $13.9m | Added +729 |
| UBS Group AG 0.00% of their portfolio | 193.7k $13.9m | Reduced -23.1k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 190.8k $13.6m | Added +5.9k |
| Allianz Asset Management GmbH 0.01% of their portfolio | 161.8k $11.3m | Reduced -19.6k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.04% of their portfolio | 151.8k $10.9m | Reduced -166.3k |
| Jupiter Topco LLC 0.00% of their portfolio | 151.5k $10.8m | First filing |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio | 149.3k $10.7m | Reduced -91.9k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 133.2k $9.5m | Reduced -4.0k |
| JUPITER ASSET MANAGEMENT LTD 0.05% of their portfolio | 131.7k $9.4m | Unchanged |
| Public Sector Pension Investment Board 0.02% of their portfolio | 130.9k $9.4m | Reduced -16.5k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 105.4k $7.5m | Added +78.2k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 103.5k $7.4m | Added +36.1k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 95.7k $6.8m | Added +14.9k |
| Vident Advisory, LLC 0.05% of their portfolio | 92.8k $6.6m | Added +14.1k |
| SG Americas Securities, LLC 0.00% of their portfolio | 91.6k $6.6m | Reduced -512.1k |
| North Reef Capital Management LP 0.24% of their portfolio | 86.6k $6.2m | Reduced -133.6k |
| Ghisallo Capital Management LLC 0.12% of their portfolio | 85.4k $6.1m | New |
| Cannell & Spears LLC 0.11% of their portfolio | 84.3k $6.0m | Reduced -129 |
| Walleye Capital LLC 0.03% of their portfolio | 82.6k $5.9m | Added +63.0k |
| Informed Momentum Co LLC 0.53% of their portfolio | 82.4k $5.9m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 81.4k $5.9m | Reduced -16.2k |
| CREDIT AGRICOLE S A 0.01% of their portfolio | 80.0k $5.7m | Added +21.6k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 78.7k $5.6m | Reduced -2.4k |
| LSV ASSET MANAGEMENT 0.01% of their portfolio | 78.3k $5.6m | Reduced -4.0k |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 74.7k $5.3m | Added +20.5k |
| ALGERT GLOBAL LLC 0.06% of their portfolio | 74.1k $5.3m | Reduced -22.6k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 70.6k $5.1m | Added +7.8k |
| Legal & General Group Plc 0.00% of their portfolio | 68.0k $4.9m | Added +3.7k |
| Linden Thomas Advisory Services, LLC 0.39% of their portfolio | 66.8k $4.8m | Added +7.3k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 65.0k $4.7m | Reduced -7.1k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 63.9k $4.6m | Added +305 |
| Trexquant Investment LP 0.03% of their portfolio | 62.7k $4.5m | Added +45.4k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 61.9k $4.4m | Reduced -19.1k |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 55.8k $4.0m | Reduced -119.1k |
| THORNBURG INVESTMENT MANAGEMENT INC 0.04% of their portfolio | 55.8k $4.0m | Added +28.0k |
| Swiss National Bank 0.00% of their portfolio | 55.6k $4.0m | Reduced -900 |
| Boston Partners 0.00% of their portfolio | 52.7k $3.8m | Reduced -4.8k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 51.9k $3.7m | Reduced -17.4k |
| Rockefeller Capital Management L.P. 0.01% of their portfolio | 50.0k $3.6m | Added +49.6k |
| CITIGROUP INC 0.00% of their portfolio | 43.8k $3.1m | Added +28.3k |
| EFG International AG 0.05% of their portfolio | 40.7k $2.9m | Reduced -771 |
| MACKENZIE FINANCIAL CORP 0.00% of their portfolio | 40.1k $2.9m | New |
| Creative Planning 0.00% of their portfolio | 40.0k $2.9m | Added +9.5k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 38.7k $2.8m | Added +3.3k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 38.5k $2.8m | Reduced -1.9k |
| CWA Asset Management Group, LLC 0.08% of their portfolio | 37.2k $2.7m | Added +3.8k |
| SEI INVESTMENTS CO 0.00% of their portfolio | 36.4k $2.6m | Added +9.4k |
| PDT Partners, LLC 0.14% of their portfolio | 36.2k $2.6m | Added +22.5k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 36.2k $2.6m | Added +28.8k |
| NATIXIS ADVISORS, LLC 0.00% of their portfolio | 35.9k $2.6m | Added +13.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 35.9k $2.0m | Reduced -2.2k |
| Redhawk Wealth Advisors, Inc. 0.25% of their portfolio | 35.3k $2.5m | Reduced -4.8k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 34.5k $2.5m | Added +7.4k |
| Engineers Gate Manager LP 0.03% of their portfolio | 34.0k $2.4m | Reduced -18.7k |
| Kendall Capital Management 0.40% of their portfolio | 34.0k $2.4m | Reduced -475 |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 33.7k $2.4m | Reduced -22.7k |
| Y-Intercept (Hong Kong) Ltd 0.05% of their portfolio | 32.5k $2.3m | Added +9.6k |
| Aquatic Capital Management LLC 0.08% of their portfolio | 31.9k $2.3m | Added +23.6k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 31.7k $2.3m | Reduced -28.9k |
| HUSSMAN STRATEGIC ADVISORS, INC. 0.52% of their portfolio | 31.5k $2.3m | Reduced -10.5k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 29.7k $2.1m | Reduced -90.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 29.3k $2.1m | Reduced -4.9k |
| Squarepoint Ops LLC 0.00% of their portfolio | 29.2k $2.1m | New |
| Diametric Capital, LP 0.21% of their portfolio | 27.8k $2.0m | New |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 27.5k $2.0m | Added +460 |
| XTX Topco Ltd 0.02% of their portfolio | 26.8k $1.9m | Added +21.9k |