NEWTON, MA
ACUMEN PHARMACEUTICALS, INC.ABOS— Latest position per institution from SEC 13F filings
15
Institutional holders
54.22M
Total shares held
148.22M
Estimated value
2.71M
Avg. position size
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
20.99M
Value
56.05M
Filed
Jun 30, 2026
SANDS CAPITAL ALTERNATIVES, LLC
CIK 1846444
Shares
3.72M
Value
9.93M
Filed
Jun 30, 2026
DEEP TRACK CAPITAL, LP
CIK 1856083
Shares
2.51M
Value
10.43M
Filed
Sep 30, 2023
BLACKROCK, INC.
CIK 2012383
Shares
2.49M
Value
6.65M
Filed
Jun 30, 2026
ALYESKA INVESTMENT GROUP, L.P.
CIK 1453072
Shares
2.45M
Value
6.55M
Filed
Jun 30, 2026
FRANKLIN TEMPLETON INC
CIK 38777
Shares
2.31M
Value
6.15M
Filed
Jun 30, 2026
BOXER CAPITAL, LLC
CIK 1465837
Shares
2.21M
Value
9.16M
Filed
Sep 30, 2023
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
2.16M
Value
5.22M
Filed
Jun 30, 2024
ADAR1 CAPITAL MANAGEMENT, LLC
CIK 1940272
Shares
2.11M
Value
5.64M
Filed
Jun 30, 2026
ROCK SPRINGS CAPITAL MANAGEMENT LP
CIK 1595725
Shares
1.84M
Value
3.16M
Filed
Dec 31, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.67M
Value
4.46M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
1.65M
Value
3.49M
Filed
Dec 31, 2025
KNOLLWOOD INVESTMENT ADVISORY, LLC
CIK 1999346
Shares
1.63M
Value
4.35M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
1.14M
Value
3.05M
Filed
Jun 30, 2026
GREAT POINT PARTNERS LLC
CIK 1281446
Shares
1.07M
Value
4.46M
Filed
Sep 30, 2023
IKARIAN CAPITAL, LLC
CIK 1778253
Shares
1.05M
Value
2.81M
Filed
Jun 30, 2026
HUDSON BAY CAPITAL MANAGEMENT LP
CIK 1393825
Shares
955K
Value
2.55M
Filed
Jun 30, 2026
PATHSTONE HOLDINGS, LLC
CIK 2011612
Shares
859.11K
Value
2.29M
Filed
Jun 30, 2026
SG AMERICAS SECURITIES, LLC
CIK 1313360
Shares
719.26K
Value
1.70K
Filed
Mar 31, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
675.02K
Value
1.80M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 20.99M | 56.05M | Jun 30, 2026 |
| 2 | SANDS CAPITAL ALTERNATIVES, LLC | 1846444 | 3.72M | 9.93M | Jun 30, 2026 |
| 3 | DEEP TRACK CAPITAL, LP | 1856083 | 2.51M | 10.43M | Sep 30, 2023 |
| 4 | BLACKROCK, INC. | 2012383 | 2.49M | 6.65M | Jun 30, 2026 |
| 5 | ALYESKA INVESTMENT GROUP, L.P. | 1453072 | 2.45M | 6.55M | Jun 30, 2026 |
| 6 | FRANKLIN TEMPLETON INC | 38777 | 2.31M | 6.15M | Jun 30, 2026 |
| 7 | BOXER CAPITAL, LLC | 1465837 | 2.21M | 9.16M | Sep 30, 2023 |
| 8 | BLACKROCK FINANCE, INC. | 1364742 | 2.16M | 5.22M | Jun 30, 2024 |
| 9 | ADAR1 CAPITAL MANAGEMENT, LLC | 1940272 | 2.11M | 5.64M | Jun 30, 2026 |
| 10 | ROCK SPRINGS CAPITAL MANAGEMENT LP | 1595725 | 1.84M | 3.16M | Dec 31, 2024 |
| 11 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.67M | 4.46M | Jun 30, 2026 |
| 12 | VANGUARD GROUP INC | 102909 | 1.65M | 3.49M | Dec 31, 2025 |
| 13 | KNOLLWOOD INVESTMENT ADVISORY, LLC | 1999346 | 1.63M | 4.35M | Jun 30, 2026 |
| 14 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 1.14M | 3.05M | Jun 30, 2026 |
| 15 | GREAT POINT PARTNERS LLC | 1281446 | 1.07M | 4.46M | Sep 30, 2023 |
| 16 | IKARIAN CAPITAL, LLC | 1778253 | 1.05M | 2.81M | Jun 30, 2026 |
| 17 | HUDSON BAY CAPITAL MANAGEMENT LP | 1393825 | 955K | 2.55M | Jun 30, 2026 |
| 18 | PATHSTONE HOLDINGS, LLC | 2011612 | 859.11K | 2.29M | Jun 30, 2026 |
| 19 | SG AMERICAS SECURITIES, LLC | 1313360 | 719.26K | 1.70K | Mar 31, 2026 |
| 20 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 675.02K | 1.80M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.