Acumen Pharmaceuticals
ABOS · NASDAQ
$2.02+$0.245 (+13.84%)TodayMarket closed ·
Prev close $1.77
Who owns ABOS
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 58.0% of ABOS’s shares.
- RA Capital Management, LP29.1%
- Sands Capital Ventures LLC5.2%
- Murray (James B Jr)5.0%
- Alyeska Investment Group, L.P.3.4%
- Next 6 largest institutions15.4%
- All other shareholders42.0%
| Holder | Shares | % of shares |
|---|---|---|
| RA Capital Management, LP | 20.99M | 29.06% |
| Sands Capital Ventures LLC | 3.72M | 5.15% |
| Murray (James B Jr) | 3.61M | 5.00% |
| Alyeska Investment Group, L.P. | 2.45M | 3.40% |
| Franklin Advisers, Inc. | 2.31M | 3.19% |
| BlackRock Institutional Trust Company, N.A. | 2.25M | 3.12% |
| Adar1 Capital Management LLC | 2.11M | 2.92% |
| Vanguard Capital Management, LLC | 1.67M | 2.31% |
| Knollwood Investment Advisory, LLC | 1.63M | 2.25% |
| Geode Capital Management, L.L.C. | 1.14M | 1.58% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Franklin Templeton Investment Funds -Biotechnology Discovery | 1.48M | 2.05% |
| Vanguard Total Stock Market Index Fund | 1.12M | 1.55% |
| iShares Russell 2000 ETF | 1.03M | 1.43% |
| Franklin Biotechnology Discovery Fund | 826.40K | 1.14% |
| Fidelity Small Cap Index Fund | 514.41K | 0.71% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $89.51K (4 trades) of ABOS on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Porter Derrell | Option exercise | 13.04K | — |
| Porter Derrell | Sale | 13.04K | $30.32K |
| Porter Derrell | Option exercise | 13.04K | $13.95K |
| Porter Derrell | Sale | 12.80K | $29.77K |
| Porter Derrell | Option exercise | 6.46K | — |
| Porter Derrell | Sale | 6.46K | $15.15K |
| Porter Derrell | Option exercise | 6.46K | $6.91K |
| Fountain Nathan B | Sale | 6.40K | $14.27K |
| Fountain Nathan B | Award | 53.25K | — |
| Fountain Nathan B | Award | 35.50K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.08M
- Days to cover
- 4.80
- % of shares outstanding
- 4.26%
- Average daily volume
- 641.52K
- Change since last report
- +9.8%
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