Acumen Pharmaceuticals, Inc.
ABOS • NASDAQ
Acumen Pharmaceuticals, Inc. is a biotechnology company in the healthcare sector on NASDAQ, led by Daniel O'Connell, with a market cap of $129.6M. As of Q3 2025, 59% of shares are held by 68 institutional investors, with RA CAPITAL MANAGEMENT, LLC as the largest holder at 24.65%.
Chief Executive OfficerDaniel O'Connell
Market Cap$129.6M
Biotechnology
Healthcare
Employees52.0
Websiteacumenpharm.com
Country
United States of America
Overview
Overview of institutional ownership in ABOS as of Q3 2025 with a market cap of $103.6M
All Institutions
- Institutions
- 68
- Value Held
- $61.1M
- Shares Held
- 35.7M
- Avg Position
- $898.5K
- Median Position
- $53.8K
Hedge Funds
- Hedge Funds
- 13
- Value Held
- $35.9M
- Shares Held
- 21.0M
- Avg Position
- $2.8M
- Median Position
- $999.1K
Ownership Breakdown
Based on market cap of $103.6M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in ABOS as of Q3 2025
| Institution | Position Value |
|---|---|
 RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | $25.5M 0.32% of portfolio |
 Sands Capital Ventures, LLC Venture Capital | $5.8M 1.28% of portfolio |
 FRANKLIN RESOURCES INC Institution | $3.9M 0.00% of portfolio |
 FMR LLC Institution | $3.5M 0.00% of portfolio |
 VANGUARD GROUP INC Institution | $2.8M 0.00% of portfolio |
 Knollwood Investment Advisory, LLC Private Equity | $2.8M 0.25% of portfolio |
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy | $1.6M 0.00% of portfolio |
A ADAR1 Capital Management, LLC Hedge Fund•Long/Short | $1.5M 0.15% of portfolio |
 Laurion Capital Management LP Hedge Fund•Multi-Strategy | $1.5M 0.22% of portfolio |
 Pathstone Holdings, LLC Family Office | $1.5M 0.01% of portfolio |
Net Capital Flow
Institutional buying and selling activity for ABOS in Q3 2025
- Traded
- −$2.8M
- Buyers
- 24
- Sellers
- 39
- Total Bought
- +$2.8M
- Total Sold
- −$5.6M
- Avg Position
- $745.1K
Biggest Buyers
| Institution | Net Bought |
|---|---|
 CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | +$844.9K +494.1K shares |
S SG Americas Securities, LLC Institution | +$690.6K +403.9K shares |
 RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant | +$577.5K +337.7K shares |
 ACADIAN ASSET MANAGEMENT LLC Long Only Manager | +$133.2K +77.9K shares |
B BRIDGEWAY CAPITAL MANAGEMENT INC Long Only Manager | +$128.2K +75.0K shares |
 BANK OF AMERICA CORP /DE/ Institution | +$114.1K +66.7K shares |
 SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | +$106.2K +62.1K shares |
J JANE STREET GROUP, LLC Institution | +$54.0K +31.6K shares |
C Cubist Systematic Strategies, LLC Institution | +$40.9K +23.9K shares |
 JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | +$27.4K +16.0K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
 MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy | −$2.3M −1.3M shares |
FRANKLIN RESOURCES INC Institution | −$1.3M −771.9K shares |
Pathstone Holdings, LLC Family Office | −$341.0K −199.4K shares |
 GOLDMAN SACHS GROUP INC Institution | −$320.7K −187.5K shares |
Y Y-Intercept Ltd Institution | −$291.0K −250.8K shares |
B BlackRock, Inc. Institution | −$200.5K −117.3K shares |
 Hudson Bay Capital Management LP Hedge Fund•Multi-Strategy | −$171.0K −100.0K shares |
 Marshall Wace LLP Institution | −$160.0K −137.9K shares |
 UBS Group AG Institution | −$108.7K −63.6K shares |
VANGUARD GROUP INC Institution | −$64.8K −37.9K shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited ABOS in Q3 2025
- New Positions
- 9
- New Value
- $82.8K
- Exited Positions
- 14
- Exited Value
- $625.7K
New Positions
| Institution | Position Value |
|---|---|
JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant | $27.4K 16.0K shares |
P PFG Investments, LLC Institution | $19.7K 11.5K shares |
 Savant Capital, LLC RIA/Wealth | $18.9K 11.0K shares |
 Larson Financial Group LLC RIA/Wealth | $6.8K 4.0K shares |
 Rockefeller Capital Management L.P. Long Only Manager | $5.1K 3.0K shares |
 TFC Financial Management RIA/Wealth | $4.3K 2.5K shares |
 Bell Investment Advisors, Inc RIA/Wealth | $620.0 362.0 shares |
 SRS Capital Advisors, Inc. RIA/Wealth | $44.0 26.0 shares |
O Optiver Holding B.V. Institution | $10.0 6.0 shares |
Exited Positions
| Institution | Previous Position |
|---|---|
Y Y-Intercept Ltd Institution | $291.0K 250.8K shares |
Marshall Wace LLP Institution | $160.0K 137.9K shares |
 AQR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy | $53.7K 46.3K shares |
 Jain Global LLC Hedge Fund•Multi-Strategy | $46.4K 40.0K shares |
T TWO SIGMA SECURITIES, LLC Institution | $23.3K 20.1K shares |
 Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy | $18.5K 15.9K shares |
D DRW Securities, LLC Institution | $12.8K 11.0K shares |
E Ethic Inc. RIA/Wealth | $12.7K 11.4K shares |
T Tower Research Capital LLC Institution | $4.2K 3.6K shares |
 Federation des caisses Desjardins du Quebec Fund of Funds | $1.7K 1.5K shares |
Options Activity
Institutions with the largest Call and Put options positions in ABOS as of Q3 2025
- Call Positions
- 2
- Call Value
- $19.8K
- Put Positions
- 0
- Put Value
- -
Call Positions
| Institution | Position Value |
|---|---|
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy | $19.8K 116.0 contracts |
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | - - contracts |
Put Positions
| Institution | Position Value |
|---|---|
| No put positions found | |
Most Committed Institutions
Institutions with ABOS as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
Sands Capital Ventures, LLC Venture Capital | 1.28% $5.8M |
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | 0.32% $25.5M |
Knollwood Investment Advisory, LLC Private Equity | 0.25% $2.8M |
Laurion Capital Management LP Hedge Fund•Multi-Strategy | 0.22% $1.5M |
A ADAR1 Capital Management, LLC Hedge Fund•Long/Short | 0.15% $1.5M |
 Ikarian Capital, LLC Hedge Fund•Event Driven | 0.09% $454.5K |
I Intrepid Financial Planning Group LLC RIA/Wealth | 0.02% $51.6K |
 CATALYST FINANCIAL PARTNERS LLC RIA/Wealth | 0.02% $153.4K |
Hudson Bay Capital Management LP Hedge Fund•Multi-Strategy | 0.01% $1.2M |
C Catalyst Funds Management Pty Ltd Institution | 0.01% $50.6K |
Hedge Fund Spotlight
Discover hedge funds investing in ABOS
Laurion Capital Management LP
Hedge Fund • Multi-Strategy
Portfolio ManagerMasih Mohebbi-Forushani
- Portfolio Value
- $679.7M
- Positions
- 105
- Last Reported
- Q3 2025
Sector Allocation
Position in Acumen Pharmaceuticals, Inc.
- Market Value
- $1.5M
- Shares Held
- 867.0K
- Portfolio Weight
- 0.22%
- Owned Since
- 2021-Q3
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Biotechnology Healthcare | $91.1M | 13.40% | |
Railroads Industrials | $90.6M | 13.34% | |
Biotechnology Healthcare | $65.2M | 9.60% |
