Acumen Pharmaceuticals (ABOS)
Develops sabirnetug, an investigational antibody for early symptomatic Alzheimer’s disease.
$2.73
After hours+0.08 (+3.20%)
At close$2.65(+2.12%)
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13F · 13D/G · Form 4
| Institutions | 66.34% | 47.97M shares | |
|---|---|---|---|
| 99 holders · as of Jun 30, 2026 | |||
| Insiders | 8.61% | 6.23M shares | |
| 15 holders · as of Jun 17, 2026 | |||
| Strategic holders | 4.73% | 3.42M shares | |
| 1 holder · as of Aug 13, 2025 | |||
| Other | 20.32% | 14.70M shares | |
| remainder | |||
72.32M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
13F, as of Jun 30, 2026
99 holders · 47.97M shares · 31 new positions · 54 increased · 14 reduced · 18 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Ra Capital Management, L.P. | 20.99M | 29.03% | 0 | Aug 14, 2026 |
| Sands Capital Ventures, LLC | 3.72M | 5.14% | 0 | Aug 13, 2026 |
| BlackRock, Inc. | 2.49M | 3.44% | +2.31M | Aug 7, 2026 |
| Alyeska Investment Group, L.P. | 2.45M | 3.39% | 0 | Aug 14, 2026 |
| Franklin Resources Inc | 2.31M | 3.19% | 0 | Aug 13, 2026 |
| Adar1 Capital Management, LLC | 2.11M | 2.92% | −45.0K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 1.67M | 2.31% | +165.8K | Aug 13, 2026 |
| Knollwood Investment Advisory, LLC | 1.63M | 2.25% | 0 | Aug 13, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| RA Capital Management, L.P.incl. RA Capital Healthcare Fund, L.P., Peter Kolchinsky +1 more | 29.50% | 21.10M | 13D | Mar 17, 2026 |
| Sands Capital Alternatives, LLC | 5.60% | 3.42M | 13G | Aug 13, 2025 |
| James B. Murray Jr. | 5.00% | 3.61M | 13G | Apr 7, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 16, 2026 | Derrell Porterdirector | Sale | 12,800 | $2.33 | 35,500 |
| Jun 17, 2026 | Derrell Porterdirector | Sale | 13,040 | $2.33 | 35,500 |
| Jun 15, 2026 | Derrell Porterdirector | Sale | 6,460 | $2.35 | 48,300 |
| Jun 9, 2026 | Nathan B. Fountaindirector | Sale | 6,400 | $2.23 | 48,150 |
| Mar 6, 2026 | Derek M. Meisnerofficer: Chief Legal Officer & Corp Sec | Sale | 2,090 | $3.26 | 173,999 |
| Feb 27, 2026 | Derek M. Meisnerofficer: Chief Legal Officer & Corp Sec | Sale | 9,406 | $3.01 | 173,999 |
| Jan 26, 2026 | Derek M. Meisnerofficer: Chief Legal Officer & Corp Sec | Sale | 15,085 | $3.00 | 173,999 |
| Jan 28, 2026 | Derek M. Meisnerofficer: Chief Legal Officer & Corp Sec | Sale | 2,671 | $3.00 | 173,999 |
| Jan 22, 2026 | Russell Bartonofficer: Chief Operating Officer | Sale | 462 | $1.84 | 205,092 |
| Jan 21, 2026 | Russell Bartonofficer: Chief Operating Officer | Sale | 2,315 | $1.81 | 205,554 |
House and Senate disclosures
Not reported.