Assembly Biosciences, Inc.
ASMB- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001426800
No open-market purchases or sales by Assembly Biosciences, Inc. insiders were filed in the last 90 days; 92 institutions reported holding it in 13F filings for Q2 2026, worth $514.8M in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Assembly Biosciences, Inc. as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 57
- +24 vs. Q2 2025
- Shares held
- 12.5M
- +9.33M (+296.5%) vs. Q2 2025
- Total value
- $324.9M
- +$267.9M (+469.5%) vs. Q2 2025
- New holders
- 31
- 15 more added
- Sold out
- 7
- 3 more reduced
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ASMB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 92 | $514.8M |
| Q1 2026 | 75 | $376.4M |
| Q4 2025 | 69 | $466.7M |
| Q3 2025 | 57 | $324.9M |
| Q2 2025 | 33 | $57.0M |
| Q1 2025 | 37 | $30.4M |
| Q4 2024 | 35 | $50.3M |
| Q3 2024 | 30 | $15.5M |
| Q2 2024 | 27 | $16.1M |
| Q1 2024 | 24 | $8.61M |
| Q4 2023 | 45 | $7.09M |
| Q3 2023 | 32 | $8.44M |
| Q2 2023 | 32 | $12.0M |
| Q1 2023 | 38 | $10.1M |
| Q4 2022 | 40 | $18.4M |
| Q3 2022 | 50 | $27.2M |
| Q2 2022 | 54 | $36.1M |
| Q1 2022 | 54 | $39.3M |
| Q4 2021 | 62 | $53.8M |
| Q3 2021 | 65 | $79.0M |
| Q2 2021 | 91 | $105.1M |
| Q1 2021 | 107 | $133.6M |
Institutions, Q3 2025
Shares, value and share of portfolio for each institution holding Assembly Biosciences, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| JPMorgan Chase & Co | 7 | $179 | 0.00% | 00.0% | Unchanged |
| Point72 Europe (London) LLP | 13 | $332 | 0.00% | +13 | New |
| Quadrant Capital Group LLC | 22 | $564 | 0.00% | +22 | New |
| EverSource Wealth Advisors, LLC | 55 | $1.41K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 58 | $1.49K | 0.00% | −244−80.8% | Reduced |
| SBI Securities Co., Ltd. | 68 | $1.74K | 0.00% | +1+1.5% | Added |
| Advisor Group Holdings, Inc. | 100 | $2.56K | 0.00% | +100 | New |
| Wells Fargo & Company | 145 | $3.71K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 190 | $4.86K | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 260 | $6.66K | 0.00% | 00.0% | Unchanged |
| Bank of America Corp | 3,371 | $86.3K | 0.00% | +3,319+6,382.7% | Added |
| Morgan Stanley | 3,527 | $90.3K | 0.00% | +1,378+64.1% | Added |
| Barclays PLC | 3,961 | $101.4K | 0.00% | +1,182+42.5% | Added |
| Qube Research & Technologies Ltd | 11,030 | $282.4K | 0.00% | +11,030 | New |
| Connor, Clark & Lunn Investment Management Ltd. | 11,156 | $285.6K | 0.00% | +11,156 | New |
| Gsa Capital Partners LLP | 12,420 | $318.0K | 0.03% | −2,420−16.3% | Reduced |
| Trexquant Investment LP | 12,526 | $320.7K | 0.00% | +12,526 | New |
| XTX Topco Ltd | 12,806 | $327.8K | 0.02% | +12,806 | New |
| Bridgeway Capital Management, LLC | 15,225 | $389.8K | 0.01% | 00.0% | Unchanged |
| UBS Group AG | 15,763 | $403.5K | 0.00% | +12,830+437.4% | Added |
| Cubist Systematic Strategies, LLC | 16,161 | $413.7K | 0.01% | +16,161 | New |
| Goldman Sachs Group Inc | 17,656 | $452.0K | 0.00% | +17,656 | New |
| Quadrature Capital Ltd | 17,935 | $459.1K | 0.01% | +17,935 | New |
| ADAR1 Capital Management, LLC | 18,947 | $485.0K | 0.05% | +18,947 | New |
| Millennium Management LLC | 21,608 | $553.2K | 0.00% | +21,608 | New |
| Acadian Asset Management LLC | 23,290 | $595.0K | 0.00% | +2,869+14.0% | Added |
| Walleye Capital LLC | 24,501 | $627.2K | 0.01% | +24,501 | New |
| Federated Hermes, Inc. | 25,394 | $650.1K | 0.00% | 00.0% | Unchanged |
| EAM Investors, LLC | 29,072 | $744.2K | 0.09% | +29,072 | New |
| Ellsworth Advisors, LLC | 29,950 | $851.8K | 0.18% | +29,950 | New |
| Jane Street Group, LLC | 33,828 | $866.0K | 0.00% | +33,828 | New |
| Palumbo Wealth Management LLC | 34,798 | $890.8K | 0.28% | +16,131+86.4% | Added |
| MPM Oncology Impact Management LP | 39,665 | $1.02M | 0.17% | +39,665 | New |
| Northern Trust Corp | 39,955 | $1.02M | 0.00% | +11,880+42.3% | Added |
| Monimus Capital Management, LP | 42,067 | $1.08M | 0.80% | 00.0% | Unchanged |
| State Street Corp | 44,814 | $1.15M | 0.00% | +30,805+219.9% | Added |
| Citadel Advisors LLC | 53,878 | $1.38M | 0.00% | +18,153+50.8% | Added |
| StemPoint Capital LP | 66,130 | $1.69M | 0.34% | +66,130 | New |
| Marshall Wace, LLP | 85,215 | $2.18M | 0.00% | +85,215 | New |
| Schonfeld Strategic Advisors LLC | 121,888 | $3.12M | 0.02% | +121,888 | New |
| Geode Capital Management, LLC | 130,095 | $3.33M | 0.00% | +79,080+155.0% | Added |
| Susquehanna International Group, LLP | 131,026 | $3.35M | 0.00% | +131,026 | New |
| Patient Square Capital LP | 135,182 | $3.46M | 0.93% | +135,182 | New |
| Renaissance Technologies LLC | 153,611 | $3.93M | 0.01% | +46,090+42.9% | Added |
| BlackRock, Inc. | 170,199 | $4.36M | 0.00% | +80,527+89.8% | Added |
| B Group, Inc. | 175,706 | $4.50M | 4.30% | −13,644−7.2% | Reduced |
| Parkman Healthcare Partners LLC | 250,981 | $6.43M | 0.71% | +250,981 | New |
| Point72 Asset Management, L.P. | 296,017 | $7.58M | 0.02% | +296,017 | New |
| Franklin Resources Inc | 238,169 | $11.4M | 0.00% | +238,169 | New |
| Blackstone Group Inc. | 447,789 | $11.5M | 0.05% | +447,789 | New |
| Frazier Life Sciences Management, L.P. | 456,249 | $11.7M | 0.35% | +456,249 | New |
| Vanguard Group Inc | 502,112 | $12.9M | 0.00% | +248,287+97.8% | Added |
| Janus Henderson Group PLC | 752,626 | $19.2M | 0.01% | +752,626 | New |
| Commodore Capital LP | 1,000,000 | $25.6M | 1.25% | +1,000,000 | New |
| Ra Capital Management, L.P. | 1,020,410 | $26.1M | 0.32% | +1,020,410 | New |
| Farallon Capital Management, L.L.C. | 1,227,590 | $31.4M | 0.18% | +1,227,590 | New |
| Gilead Sciences, Inc. | 4,505,391 | $115.3M | 6.44% | +2,295,920+103.9% | Added |
| Man Group plc | 0 | $0 | 0.00% | −13,227−100.0% | Sold out |
| Lynx1 Capital Management LP | 0 | $0 | 0.00% | −10,366−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −250−100.0% | Sold out |
| Tower Research Capital LLC (TRC) | 0 | $0 | 0.00% | −250−100.0% | Sold out |
| Ameriflex Group, Inc. | 0 | $0 | 0.00% | −83−100.0% | Sold out |
| Royal Bank of Canada | 0 | $0 | 0.00% | −53−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −34−100.0% | Sold out |