49% buyers of institutions opening or closing positions this quarter
1 more exits than new buyers, ownership rose 9.62 percentage points vs the prior quarter, and 2 well-known fund managers in the top 25.
49% buyers of institutions opening or closing positions this quarter
66.9% institutional ownership
PAULSON & CO. portfolio allocation
Institutional ownership vs Asset Management peers
No Form 4 insider transactions on file
Latest positioning in AAMI across 13F flow, ownership shift, marquee holders, and holder-count growth.
Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in AAMI held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | PAULSON & CO. INC. | 7.7M | $421.4M | 0.0% | 21.676% | 13.54% |
| 2 | BlackRock, Inc. | 4.6M | $248.9M | -1.7% | 12.805% | 0.00% |
| 3 | JENNISON ASSOCIATES LLC | 2.0M | $110.0M | +5.9% | 5.661% | 0.08% |
| 4 | Empyrean Capital Partners, LP | 1.3M | $71.2M | -6.9% | 3.662% | 2.32% |
| 5 | STATE STREET CORP | 1.2M | $65.8M | +0.3% | 3.386% | 0.00% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.2M | $63.1M | — | 3.244% | 0.00% |
| 7 | DIMENSIONAL FUND ADVISORS LP | 905K | $49.2M | -0.5% | 2.532% | 0.01% |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | 884K | $48.1M | — | 2.474% | 0.00% |
| 9 | Impax Asset Management Group plc | 823K | $44.8M | -2.6% | 2.305% | 0.31% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 748K | $40.7M | +9.1% | 2.093% | 0.00% |
| 11 | Woodline Partners LP | 702K | $38.2M | +25.5% | 1.964% | 0.14% |
| 12 | SOROS FUND MANAGEMENT LLC | 649K | $35.3M | -12.0% | 1.816% | 0.39% |
| 13 | Nuveen, LLC | 588K | $32.0M | -9.8% | 1.647% | 0.01% |
| 14 | FEDERATED HERMES, INC. | 568K | $30.9M | +1.8% | 1.591% | 0.05% |
| 15 | MORGAN STANLEY | 538K | $29.3M | +1.0% | 1.505% | 0.00% |
| 16 | TWO SIGMA INVESTMENTS, LP | 479K | $26.1M | +68.9% | 1.340% | 0.02% |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 453K | $24.7M | -5.6% | 1.269% | 0.00% |
| 18 | Allspring Global Investments Holdings, LLC | 419K | $23.6M | +13.9% | 1.174% | 0.04% |
| 19 | Invesco Ltd. | 413K | $22.5M | -1.9% | 1.155% | 0.00% |
| 20 | Systematic Alpha Investments, LLC | 370K | $20.1M | 0.0% | 1.036% | 0.71% |
| 21 | Azora Capital LP | 329K | $17.9M | — | 0.922% | 1.18% |
| 22 | JACOBS LEVY EQUITY MANAGEMENT, INC | 318K | $17.3M | -24.1% | 0.891% | 0.07% |
| 23 | Boston Trust Walden Corp | 282K | $15.3M | — | 0.788% | 0.13% |
| 24 | NORTHERN TRUST CORP | 279K | $15.2M | +0.0% | 0.781% | 0.00% |
| 25 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 264K | $14.4M | +3.4% | 0.738% | 0.05% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in AAMI — a direct measure of their conviction.
Filings activity in AAMI during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 252 | 0.4% | 66.92% | +9.62 pp | $1.88B | +17% |
| Q4 2025 | 253 | +3.3% | 57.30% | 1.39 pp | $1.61B | 2.4% |
| Q3 2025 | 245 | +14% | 58.69% | +14.34 pp | $1.65B | +32% |
| Q2 2025 | 215 | +14% | 44.35% | +11.92 pp | $1.24B | +37% |
| Q1 2025 | 189 | +6.2% | 32.43% | 2.18 pp | $910M | 6.3% |
| Q4 2024 | 178 | +4.7% | 34.61% | +1.82 pp | $971M | +5.5% |
| Q3 2024 | 170 | +3.7% | 32.79% | +3.75 pp | $920M | +13% |
| Q2 2024 | 164 | — | 29.04% | — | $815M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
No recent Form 4 insider transactions on file for AAMI.
Quick answers to the most common questions about buying AAMI stock.
Based on Q1 2026 13F filings, institutional ownership of Acadian Asset Management stands at 66.9%, held across 252 reporting institutions.
PAULSON & CO. INC. is the largest reported institutional holder of AAMI, with approximately 7,743,282 shares worth $0.42B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of AAMI, including SOROS FUND MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for AAMI is 61 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
38 institutions opened new positions in AAMI during Q1 2026, while 39 fully exited. 167 added to existing positions and 43 trimmed.
AAMI institutional ownership rose by 9.62 percentage points quarter-over-quarter, with a net change of -1 holders.
The top 10 institutions account for 62.0% of all reported 13F value in AAMI, and the top 25 account for 81.3%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.