Assembly Biosciences
ASMB • NASDAQ
Assembly Biosciences is a biotechnology company in the healthcare sector on NASDAQ, led by Jason A. Okazaki, with a market cap of $571.0M. As of Q3 2025, 165% of shares are held by 57 institutional investors, with GILEAD SCIENCES, INC. as the largest holder at 58.72%.
Chief Executive OfficerJason A. Okazaki
Market Cap$571.0M
Biotechnology
Healthcare
Employees65.0
Websiteassemblybio.com
Country
United States of America
Overview
Overview of institutional ownership in ASMB as of Q3 2025 with a market cap of $196.4M
All Institutions
- Institutions
- 57
- Value Held
- $324.9M
- Shares Held
- 12.5M
- Avg Position
- $5.7M
- Median Position
- $744.2K
Hedge Funds
- Hedge Funds
- 15
- Value Held
- $110.7M
- Shares Held
- 4.3M
- Avg Position
- $7.4M
- Median Position
- $1.7M
Ownership Breakdown
Based on market cap of $196.4M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.
Biggest Investors
Institutions with the largest positions in ASMB as of Q3 2025
| Institution | Position Value |
|---|---|
 GILEAD SCIENCES, INC. Institution | $115.3M 6.44% of portfolio |
 FARALLON CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy | $31.4M 0.18% of portfolio |
 RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | $26.1M 0.32% of portfolio |
 COMMODORE CAPITAL LP Hedge Fund•Long/Short | $25.6M 1.25% of portfolio |
 HENDERSON GROUP PLC Institution | $19.2M 0.01% of portfolio |
 VANGUARD GROUP INC Institution | $12.9M 0.00% of portfolio |
 Frazier Life Sciences Management, L.P. Venture Capital | $11.7M 0.35% of portfolio |
 Blackstone Group L.P. Institution | $11.5M 0.05% of portfolio |
 FRANKLIN RESOURCES INC Institution | $11.4M 0.00% of portfolio |
 Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy | $7.6M 0.02% of portfolio |
Net Capital Flow
Institutional buying and selling activity for ASMB in Q3 2025
- Traded
- +$244.5M
- Buyers
- 46
- Sellers
- 10
- Total Bought
- +$245.3M
- Total Sold
- −$857.1K
- Avg Position
- $5.1M
Biggest Buyers
| Institution | Net Bought |
|---|---|
GILEAD SCIENCES, INC. Institution | +$58.8M +2.3M shares |
FARALLON CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy | +$31.4M +1.2M shares |
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | +$26.1M +1.0M shares |
COMMODORE CAPITAL LP Hedge Fund•Long/Short | +$25.6M +1.0M shares |
HENDERSON GROUP PLC Institution | +$19.2M +752.6K shares |
Frazier Life Sciences Management, L.P. Venture Capital | +$11.7M +456.2K shares |
Blackstone Group L.P. Institution | +$11.5M +447.8K shares |
FRANKLIN RESOURCES INC Institution | +$11.4M +238.2K shares |
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy | +$7.6M +296.0K shares |
 Parkman Healthcare Partners LLC Hedge Fund•Long/Short | +$6.4M +251.0K shares |
Biggest Sellers
| Institution | Net Sold |
|---|---|
B B Group, Inc. Institution | −$349.3K −13.6K shares |
M Man Group plc Institution | −$239.7K −13.2K shares |
L Lynx1 Capital Management LP Hedge Fund•Sector | −$187.8K −10.4K shares |
 GSA CAPITAL PARTNERS LLP Hedge Fund•Quant | −$62.0K −2.4K shares |
B BNP PARIBAS ARBITRAGE, SA Institution | −$6.2K −244.0 shares |
T Tower Research Capital LLC Institution | −$4.5K −250.0 shares |
 RAYMOND JAMES FINANCIAL INC RIA/Wealth | −$4.5K −250.0 shares |
A AMERIFLEX GROUP, INC. Institution | −$1.4K −83.0 shares |
R ROYAL BANK OF CANADA Institution | −$1.0K −53.0 shares |
−$616.0 −34.0 shares |
Entry and Exit Activity
Institutions that initiated new positions or completely exited ASMB in Q3 2025
- New Positions
- 13
- New Value
- $89.3M
- Exited Positions
- 7
- Exited Value
- $439.6K
New Positions
| Institution | Position Value |
|---|---|
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | $26.1M 1.0M shares |
COMMODORE CAPITAL LP Hedge Fund•Long/Short | $25.6M 1.0M shares |
Frazier Life Sciences Management, L.P. Venture Capital | $11.7M 456.2K shares |
Blackstone Group L.P. Institution | $11.5M 447.8K shares |
Parkman Healthcare Partners LLC Hedge Fund•Long/Short | $6.4M 251.0K shares |
 Patient Square Capital LP Private Equity | $3.5M 135.2K shares |
 StemPoint Capital LP Hedge Fund•Long/Short | $1.7M 66.1K shares |
 MPM Oncology Impact Management LP Institution | $1.0M 39.7K shares |
 Ellsworth Advisors, LLC RIA/Wealth | $851.8K 30.0K shares |
A ADAR1 Capital Management, LLC Hedge Fund•Long/Short | $485.0K 18.9K shares |
Exited Positions
| Institution | Previous Position |
|---|---|
M Man Group plc Institution | $239.7K 13.2K shares |
L Lynx1 Capital Management LP Hedge Fund•Sector | $187.8K 10.4K shares |
RAYMOND JAMES FINANCIAL INC RIA/Wealth | $4.5K 250.0 shares |
T Tower Research Capital LLC Institution | $4.5K 250.0 shares |
A AMERIFLEX GROUP, INC. Institution | $1.4K 83.0 shares |
R ROYAL BANK OF CANADA Institution | $1.0K 53.0 shares |
$616.0 34.0 shares |
Options Activity
Institutions with the largest Call and Put options positions in ASMB as of Q3 2025
- Call Positions
- 2
- Call Value
- $11.4M
- Put Positions
- 0
- Put Value
- -
Call Positions
| Institution | Position Value |
|---|---|
 Caption Management, LLC Hedge Fund•Long/Short | $9.0M 3.5K contracts |
 SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity | $2.4M 950.0 contracts |
Put Positions
| Institution | Position Value |
|---|---|
| No put positions found | |
Most Committed Institutions
Institutions with ASMB as the highest % of their portfolio as of Q3 2025
| Institution | Portfolio Weight |
|---|---|
GILEAD SCIENCES, INC. Institution | 6.44% $115.3M |
B B Group, Inc. Institution | 5.20% $4.5M |
COMMODORE CAPITAL LP Hedge Fund•Long/Short | 1.25% $25.6M |
Patient Square Capital LP Private Equity | 0.93% $3.5M |
M MONIMUS CAPITAL MANAGEMENT, LP Hedge Fund•Long/Short | 0.82% $1.1M |
Parkman Healthcare Partners LLC Hedge Fund•Long/Short | 0.71% $6.4M |
Frazier Life Sciences Management, L.P. Venture Capital | 0.35% $11.7M |
StemPoint Capital LP Hedge Fund•Long/Short | 0.34% $1.7M |
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short | 0.32% $26.1M |
 Palumbo Wealth Management LLC RIA/Wealth | 0.28% $890.8K |
Hedge Fund Spotlight
Discover hedge funds investing in ASMB
Walleye Trading Advisors, LLC
Hedge Fund • Multi-Strategy
Portfolio ManagerWilliam Dunning England
- Portfolio Value
- $11.2B
- Positions
- 1,691
- Last Reported
- Q3 2025
Sector Allocation
Position in Assembly Biosciences
- Market Value
- $627.2K
- Shares Held
- 24.5K
- Portfolio Weight
- 0.01%
- Owned Since
- 2025-Q3
| Top Holding | Sector | Market Value | Weight |
|---|---|---|---|
Semiconductors Technology | $463.8M | 4.15% | |
Specialty Retail Consumer Cyclical | $346.6M | 3.10% | |
Auto - Manufacturers Consumer Cyclical | $288.5M | 2.58% |
