Acumen Pharmaceuticals Ownership | Who Owns Acumen Pharmaceuticals?
Acumen Pharmaceuticals Ownership Summary
Acumen Pharmaceuticals is owned by 24.68% institutional investors, 7.46% insiders, and 67.85% retail investors. Ra capital management is the largest institutional shareholder, holding 34.66% of ABOS shares. Franklin Biotechnology Discv A(acc)USD is the top mutual fund, with 2.58% of its assets in Acumen Pharmaceuticals shares.
ABOS Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Acumen Pharmaceuticals | 24.68% | 7.46% | 67.85% |
| Sector | Healthcare Stocks | 232.80% | 10.63% | -143.43% |
| Industry | Biotech Stocks | 379.48% | 10.37% | -289.85% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Ra capital management | 20.99M | 34.66% | $49.54M |
| Sands capital ventures | 3.72M | 6.14% | $8.78M |
| Alyeska investment group | 2.45M | 4.05% | $5.78M |
| Franklin resources | 2.31M | 3.81% | $5.44M |
| Blackrock | 2.16M | 3.61% | $5.22M |
| Vanguard group | 1.65M | 2.73% | $3.49M |
| Knollwood investment advisory | 1.63M | 2.69% | $3.84M |
| Fmr | 1.16M | 1.91% | $2.73M |
| Ikarian capital | 1.05M | 1.74% | $2.49M |
| Hudson bay capital management lp | 968.94K | 1.60% | $2.29M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Sands capital ventures | 3.72M | 2.08% | $8.78M |
| Ra capital management | 20.99M | 0.52% | $49.54M |
| Knollwood investment advisory | 1.63M | 0.39% | $3.84M |
| Ikarian capital | 1.05M | 0.20% | $2.49M |
| Adar1 capital management | 891.18K | 0.14% | $1.52M |
| Verdad advisers, lp | 37.28K | 0.10% | $87.98K |
| Rangeley capital | 35.00K | 0.08% | $82.60K |
| Laurion capital management lp | 525.44K | 0.05% | $1.24M |
| Intrepid financial planning group | 30.15K | 0.03% | $71.15K |
| Catalyst financial partners | 89.70K | 0.03% | $211.69K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ra capital management | 20.99M | 0.52% | 6.06M |
| Blackrock | 2.16M | 0.00% | 1.97M |
| Alyeska investment group | 2.45M | 0.02% | 1.52M |
| Ikarian capital | 1.05M | 0.20% | 799.49K |
| Two sigma investments, lp | 530.81K | 0.00% | 387.59K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Rock springs capital management lp | - | - | -1.84M |
| Fmr | 1.16M | 0.00% | -870.15K |
| Parkman healthcare partners | - | - | -576.66K |
| Laurion capital management lp | 525.44K | 0.05% | -341.60K |
| Y-intercept (hong kong) | - | - | -250.85K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Vanguard fiduciary trust | 199.23K | 0.00% | 199.23K | $470.17K |
| Verdad advisers, lp | 37.28K | 0.10% | 37.28K | $87.98K |
| Rangeley capital | 35.00K | 0.08% | 35.00K | $82.60K |
| Axq capital, lp | 28.49K | 0.01% | 28.49K | $67.23K |
| Cubist systematic strategies | 23.90K | 0.00% | 23.90K | $40.88K |
Sold Out
| Holder | Change |
|---|---|
| True wealth design | -35.00 |
| Capital performance advisors llp | -52.00 |
| Russell investments group | -278.00 |
| Coldstream capital management | -311.00 |
| Flagship harbor advisors | -350.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Dec 31, 2025 | 47 | -32.86% | 14,951,519 | -58.16% | 24 | 0.71% | 15 | -34.78% | 11 | -59.26% |
| Sep 30, 2025 | 65 | -9.72% | 33,908,640 | -9.82% | 55 | 1.45% | 20 | -35.48% | 27 | 12.50% |
| Jun 30, 2025 | 72 | -13.25% | 37,610,957 | -6.52% | 62 | 1.41% | 31 | 19.23% | 24 | -29.41% |
| Mar 31, 2025 | 5 | -93.83% | 16,490,041 | -61.19% | 27 | 0.54% | 1 | -97.50% | 2 | -90.00% |
| Dec 31, 2024 | 81 | 5.19% | 42,494,401 | -2.55% | 70 | 1.34% | 40 | 17.65% | 20 | -4.76% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Franklin Biotechnology Discv A(acc)USD | 1.86M | 2.58% | - |
| iShares Russell 2000 ETF | 971.80K | 1.60% | - |
| Vanguard Total Stock Mkt Idx Inv | 1.12M | 1.55% | - |
| Franklin US Small Cap Growth Equity | 771.94K | 1.27% | 3.97K |
| Franklin Small Cap Growth SMA | 771.94K | 1.27% | 771.94K |
| Franklin Small Cap Growth Adv | 708.38K | 1.17% | -59.59K |
| Franklin Biotechnology Discovery A | 826.40K | 1.14% | - |
| Fidelity Select Health Care | 658.90K | 0.91% | -481.10K |
| Fidelity Small Cap Index | 408.40K | 0.67% | - |
| Fidelity Advisor Health Care I | 457.39K | 0.63% | -242.61K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Mar 06, 2026 | Meisner Derek M | Chief Legal Officer & Corp Sec | Sell | $6.81K |
| Feb 27, 2026 | Meisner Derek M | Chief Legal Officer & Corp Sec | Sell | $28.31K |
| Jan 26, 2026 | Meisner Derek M | Chief Legal Officer & Corp Sec | Sell | $45.26K |
| Jan 28, 2026 | Meisner Derek M | Chief Legal Officer & Corp Sec | Sell | $8.02K |
| Jan 23, 2026 | Meisner Derek M | Chief Legal Officer & Corp Sec | Sell | $10.72K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q1 | - | 44 |
| 2025 Q4 | - | - |
| 2025 Q2 | - | - |
| 2025 Q1 | - | 11 |
| 2024 Q4 | - | - |
ABOS Ownership FAQ
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