Acadian Asset Management Inc (AAMI) Ownership
AAMI ownership summary
as of October 18, 2026- Institutions
- 109.2% of shares outstanding
- Insiders
- 0.52% of shares outstanding
- Shares outstanding
- 35.5M
- Float
- 29.4M shares available to trade
- Short interest
- 7.28% 1.7M shares short
- Days to cover
- 3.46 short interest up 99.7% vs prior month
- Institutions 109.21%
- Insiders 0.52%
AAMI top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Paulson & Company Inc | 16.46% | 5.8M | $538.5M | −1.9M (−24.5%) | June 30, 2026 |
| 2 | BlackRock Inc | 12.64% | 4.5M | $413.5M | −87,697 (−1.9%) | June 30, 2026 |
| 3 | Jennison Associates LLC | 4.30% | 1.5M | $140.7M | −495,637 (−24.5%) | June 30, 2026 |
| 4 | Amvescap Plc. | 3.88% | 1.4M | $126.9M | +963,829 (+233.5%) | June 30, 2026 |
| 5 | Empyrean Capital Partners, LP | 3.69% | 1.3M | $120.5M | −190 (−0.0%) | June 30, 2026 |
| 6 | State Street Corp | 3.45% | 1.2M | $112.8M | +14,948 (+1.2%) | June 30, 2026 |
| 7 | Vanguard Capital Management, LLC | 3.31% | 1.2M | $108.4M | +17,624 (+1.5%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 2.73% | 970K | $89.4M | +221,902 (+29.7%) | June 30, 2026 |
| 9 | Dimensional Fund Advisors, Inc. | 2.57% | 912K | $84.0M | +7,118 (+0.8%) | June 30, 2026 |
| 10 | Woodline Partners LP | 2.49% | 884K | $81.4M | +181,820 (+25.9%) | June 30, 2026 |
| 11 | Vanguard Portfolio Management, LLC | 2.29% | 813K | $75.0M | −70,557 (−8.0%) | June 30, 2026 |
| 12 | Driehaus Capital Management LLC | 2.22% | 789K | $72.7M | +788,901 (0.0%) | June 30, 2026 |
| 13 | Avantyr Capital Partners, LP | 2.16% | 768K | $70.8M | +767,793 (0.0%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 1.76% | 623K | $57.5M | +85,779 (+16.0%) | June 30, 2026 |
| 15 | Soros Fund Management LLC | 1.72% | 610K | $56.2M | −38,559 (−5.9%) | June 30, 2026 |
| 16 | Nuveen, LLC | 1.70% | 602K | $55.5M | +13,914 (+2.4%) | June 30, 2026 |
| 17 | Federated Hermes Inc | 1.62% | 575K | $53.0M | +6,277 (+1.1%) | June 30, 2026 |
| 18 | Allspring Global Investments Holdings, LLC | 1.56% | 554K | $51.0M | +134,384 (+32.1%) | June 30, 2026 |
| 19 | Two Sigma Investments LLC | 1.48% | 524K | $48.3M | +45,125 (+9.4%) | June 30, 2026 |
| 20 | Azora Capital LP | 1.40% | 496K | $45.7M | +166,656 (+50.6%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 3.4M shares and 6 cut 2.6M.
AAMI top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 4.94% | 1.8M | $161.6M | +408 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.39% | 850K | $78.3M | −1,250 (−0.1%) | August 31, 2026 |
| 3 | Invesco Discovery A | 2.29% | 812K | $74.9M | +67,057 (+9.0%) | August 31, 2026 |
| 4 | iShares Russell 2000 ETF | 2.24% | 794K | $73.1M | −4,992 (−0.6%) | September 30, 2026 |
| 5 | PGIM Jennison Small Company A | 1.24% | 439K | $40.5M | −134,186 (−23.4%) | August 31, 2026 |
| 6 | CREF Total Global Stock Account R3 | 0.90% | 319K | $29.4M | — | July 31, 2026 |
| 7 | Fidelity Small Cap Index | 0.87% | 309K | $28.4M | +3,384 (+1.1%) | July 31, 2026 |
| 8 | Impax Small Cap Institutional | 0.85% | 300K | $27.6M | −50,000 (−14.3%) | August 31, 2026 |
| 9 | iShares Russell 2000 Growth ETF | 0.81% | 286K | $26.4M | −363 (−0.1%) | September 30, 2026 |
| 10 | iShares S&P Small-Cap 600 Growth ETF | 0.77% | 273K | $25.2M | — | September 30, 2026 |
| 11 | State Street SPDR Port S&P 600 Sm CpETF | 0.76% | 270K | $24.9M | — | September 30, 2026 |
| 12 | Fidelity Enhanced Small Cap Core ETF | 0.62% | 219K | $20.2M | +459 (+0.2%) | September 30, 2026 |
| 13 | Driehaus Small Cap Growth Institutional | 0.61% | 217K | $20.0M | +50,471 (+30.3%) | July 31, 2026 |
| 14 | Invesco S&P SmallCap Momentum ETF | 0.61% | 217K | $20.0M | — | September 30, 2026 |
| 15 | DFA US Small Cap I | 0.57% | 203K | $18.7M | — | August 31, 2026 |
| 16 | Vanguard Tax-Managed Small Cap Adm | 0.54% | 193K | $17.8M | — | August 31, 2026 |
| 17 | Bridge Builder Small/Mid Cap Value | 0.54% | 192K | $17.7M | +192,142 (0.0%) | September 30, 2026 |
| 18 | Federated Hermes MDT Small Cap Core IS | 0.52% | 184K | $17.0M | — | June 30, 2026 |
| 19 | Invesco Small Cap Growth A | 0.52% | 184K | $16.9M | +64,226 (+53.8%) | August 31, 2026 |
| 20 | Heptagon Driehaus US Sm Cp Eq C USD Acc | 0.51% | 182K | $16.8M | +8,585 (+4.9%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AAMI insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-11 | Robert J Chersi | Sell | $51.30 | 28,753 | $1.5M |
| 2026-02-10 | Barbara Trebbi | Sell | $51.22 | 9,691 | $496,373 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
AAMI shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AAMI
Institutional investors own 109.2% of Acadian Asset Management's shares and insiders 0.52%. The largest holder is Paulson & Company Inc with 16.46% of the shares (5.8M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 6 reduced their stake in the latest filings. Short interest is 7.28% of the float, or 3.46 days of average trading volume. The share count fell 70.2% since 2014.
Related: AAMI analyst forecast, AAMI key metrics, AAMI dividend history. See the AAMI stock overview for the latest quote and news.
AAMI ownership FAQ
Who owns the most Acadian Asset Management stock?
The largest shareholders of Acadian Asset Management are Paulson & Company Inc (16.46%), BlackRock Inc (12.64%), Jennison Associates LLC (4.30%), Amvescap Plc. (3.88%), Empyrean Capital Partners, LP (3.69%).
What percentage of Acadian Asset Management is owned by institutions?
Institutions hold 109.2% of Acadian Asset Management's shares outstanding; insiders hold 0.52%.
Which funds own Acadian Asset Management?
The largest fund holders of Acadian Asset Management are iShares Core S&P Small-Cap ETF (4.94%), Vanguard MStar Total Stk Mkt Idx Invest (2.39%), Invesco Discovery A (2.29%), iShares Russell 2000 ETF (2.24%), PGIM Jennison Small Company A (1.24%).
What is Acadian Asset Management's short interest?
1.7M shares of Acadian Asset Management were sold short, 7.28% of the float; at the average daily volume it would take 3.46 days to cover.
Are insiders buying or selling Acadian Asset Management?
Of the latest 2 reported insider transactions in Acadian Asset Management (since February 10, 2026), 0 were purchases and 2 were sales.
How many shares of Acadian Asset Management are outstanding?
Acadian Asset Management has 35.5M shares outstanding, of which 29.4M are in the public float.