ABOS
Acumen Pharmaceuticals, Inc.
NASDAQ · Healthcare · Biotechnology · US
$3.18
+2.91%0
Insider buys (3m)
4
Insider sells (3m)
-$89.5K
Net value (3m)
+44.4%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Jun 17, 2026 | Porter Derrell · director | M-Exempt | 6,460 | $1.07 |
| Jun 17, 2026 | Porter Derrell · director | M-Exempt | 13,040 | $1.07 |
| Jun 17, 2026 | Porter Derrell · director | Sale | 13,040 | $2.33 |
| Jun 17, 2026 | Porter Derrell · director | Sale | 12,800 | $2.33 |
| Jun 17, 2026 | Porter Derrell · director | Sale | 6,460 | $2.35 |
| Jun 10, 2026 | Fountain Nathan B · director | Sale | 6,400 | $2.23 |
| Jun 5, 2026 | Ives Jeffrey L. · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Stalfort John A III · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Porter Derrell · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Porter Derrell · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Stalfort John A III · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Fountain Nathan B · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Fountain Nathan B · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Drapkin Kimberlee C · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | RA CAPITAL MANAGEMENT, L.P. · director, 10 percent owner: | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | RA CAPITAL MANAGEMENT, L.P. · director, 10 percent owner: | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Ives Jeffrey L. · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Drapkin Kimberlee C · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Stoppel Laura · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Stoppel Laura · director | A-Award | 35,500 | $0.00 |
| Jun 5, 2026 | Golumbeski George · director | A-Award | 53,250 | $2.29 |
| Jun 5, 2026 | Golumbeski George · director | A-Award | 35,500 | $0.00 |
| Mar 18, 2026 | RA CAPITAL MANAGEMENT, L.P. · director, 10 percent owner: | A-Award | 6,060,606 | $3.30 |
| Mar 10, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | Sale | 2,090 | $3.26 |
| Mar 10, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | M-Exempt | 2,090 | $1.85 |
| Mar 3, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | Sale | 9,406 | $3.01 |
| Mar 3, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | M-Exempt | 9,406 | $1.85 |
| Jan 28, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | M-Exempt | 2,671 | $1.85 |
| Jan 28, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | M-Exempt | 15,085 | $1.85 |
| Jan 28, 2026 | Meisner Derek M · officer: Chief Legal Officer & Corp Sec | Sale | 15,085 | $3.00 |
Institutional positioning
13F filings over the trailing two quarters
New 21Increased 31Reduced 16Sold out 83
| Filer | Action | Shares | Filed |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | Increased | 20,992,669 | May 15, 2026 |
| SANDS CAPITAL VENTURES, LLC | Increased | 3,720,105 | May 8, 2026 |
| ALYESKA INVESTMENT GROUP, L.P. | Increased | 2,454,754 | May 15, 2026 |
| FRANKLIN RESOURCES INC | Unchanged | 2,305,096 | May 13, 2026 |
| ADAR1 CAPITAL MANAGEMENT, LLC | Increased | 2,156,334 | May 18, 2026 |
| KNOLLWOOD INVESTMENT ADVISORY, LLC | Unchanged | 1,628,510 | May 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1,506,277 | May 15, 2026 |
| FMR LLC | Reduced | 1,157,346 | May 15, 2026 |
| IKARIAN CAPITAL, LLC | Increased | 1,053,797 | May 15, 2026 |
| HUDSON BAY CAPITAL MANAGEMENT LP | Increased | 968,940 | May 13, 2026 |
| PATHSTONE HOLDINGS, LLC | Unchanged | 859,110 | May 11, 2026 |
| SG AMERICAS SECURITIES, LLC | Increased | 719,257 | Apr 16, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 713,376 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 659,675 | May 15, 2026 |
| TWO SIGMA INVESTMENTS, LP | Increased | 530,812 | May 15, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Jun 17, 2026