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
- 16 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 | $381.5M |
| Q4 2025 | 69 | $466.7M |
| Q3 2025 | 57 | $324.9M |
| Q2 2025 | 33 | $57.1M |
| Q1 2025 | 37 | $30.4M |
| Q4 2024 | 35 | $50.3M |
| Q3 2024 | 30 | $15.6M |
| Q2 2024 | 27 | $16.1M |
| Q1 2024 | 24 | $8.68M |
| Q4 2023 | 45 | $7.12M |
| Q3 2023 | 32 | $8.62M |
| Q2 2023 | 32 | $12.0M |
| Q1 2023 | 38 | $11.1M |
| Q4 2022 | 40 | $18.4M |
| Q3 2022 | 50 | $27.2M |
| Q2 2022 | 54 | $36.1M |
| Q1 2022 | 54 | $39.3M |
| Q4 2021 | 62 | $54.3M |
| 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 |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | 4,505,391 | $115.3M | 6.44% | +2,295,920+103.9% | Added |
| Farallon Capital Management, L.L.C. | 1,227,590 | $31.4M | 0.18% | +1,227,590 | New |
| Ra Capital Management, L.P. | 1,020,410 | $26.1M | 0.32% | +1,020,410 | New |
| Commodore Capital LP | 1,000,000 | $25.6M | 1.25% | +1,000,000 | New |
| Janus Henderson Group PLC | 752,626 | $19.2M | 0.01% | +752,626 | New |
| Vanguard Group Inc | 502,112 | $12.9M | 0.00% | +248,287+97.8% | Added |
| Frazier Life Sciences Management, L.P. | 456,249 | $11.7M | 0.35% | +456,249 | New |
| Blackstone Group Inc. | 447,789 | $11.5M | 0.05% | +447,789 | New |
| Franklin Resources Inc | 238,169 | $11.4M | 0.00% | +238,169 | New |
| Point72 Asset Management, L.P. | 296,017 | $7.58M | 0.02% | +296,017 | New |
| Parkman Healthcare Partners LLC | 250,981 | $6.43M | 0.71% | +250,981 | New |
| B Group, Inc. | 175,706 | $4.50M | 4.30% | −13,644−7.2% | Reduced |
| BlackRock, Inc. | 170,199 | $4.36M | 0.00% | +80,527+89.8% | Added |
| Renaissance Technologies LLC | 153,611 | $3.93M | 0.01% | +46,090+42.9% | Added |
| Patient Square Capital LP | 135,182 | $3.46M | 0.93% | +135,182 | New |
| Susquehanna International Group, LLP | 131,026 | $3.35M | 0.00% | +131,026 | New |
| Geode Capital Management, LLC | 130,095 | $3.33M | 0.00% | +79,080+155.0% | Added |
| Schonfeld Strategic Advisors LLC | 121,888 | $3.12M | 0.02% | +121,888 | New |
| Marshall Wace, LLP | 85,215 | $2.18M | 0.00% | +85,215 | New |
| StemPoint Capital LP | 66,130 | $1.69M | 0.34% | +66,130 | New |
| Citadel Advisors LLC | 53,878 | $1.38M | 0.00% | +18,153+50.8% | Added |
| State Street Corp | 44,814 | $1.15M | 0.00% | +30,805+219.9% | Added |
| Monimus Capital Management, LP | 42,067 | $1.08M | 0.80% | 00.0% | Unchanged |
| Northern Trust Corp | 39,955 | $1.02M | 0.00% | +11,880+42.3% | Added |
| MPM Oncology Impact Management LP | 39,665 | $1.02M | 0.17% | +39,665 | New |
| Palumbo Wealth Management LLC | 34,798 | $890.8K | 0.28% | +16,131+86.4% | Added |
| Jane Street Group, LLC | 33,828 | $866.0K | 0.00% | +33,828 | New |
| Ellsworth Advisors, LLC | 29,950 | $851.8K | 0.18% | +29,950 | New |
| EAM Investors, LLC | 29,072 | $744.2K | 0.09% | +29,072 | New |
| Federated Hermes, Inc. | 25,394 | $650.1K | 0.00% | 00.0% | Unchanged |
| Walleye Capital LLC | 24,501 | $627.2K | 0.01% | +24,501 | New |
| Acadian Asset Management LLC | 23,290 | $595.0K | 0.00% | +2,869+14.0% | Added |
| Millennium Management LLC | 21,608 | $553.2K | 0.00% | +21,608 | New |
| ADAR1 Capital Management, LLC | 18,947 | $485.0K | 0.05% | +18,947 | New |
| Quadrature Capital Ltd | 17,935 | $459.1K | 0.01% | +17,935 | New |
| Goldman Sachs Group Inc | 17,656 | $452.0K | 0.00% | +17,656 | New |
| Cubist Systematic Strategies, LLC | 16,161 | $413.7K | 0.01% | +16,161 | New |
| UBS Group AG | 15,763 | $403.5K | 0.00% | +12,830+437.4% | Added |
| Bridgeway Capital Management, LLC | 15,225 | $389.8K | 0.01% | 00.0% | Unchanged |
| XTX Topco Ltd | 12,806 | $327.8K | 0.02% | +12,806 | New |
| Trexquant Investment LP | 12,526 | $320.7K | 0.00% | +12,526 | New |
| Gsa Capital Partners LLP | 12,420 | $318.0K | 0.03% | −2,420−16.3% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 11,156 | $285.6K | 0.00% | +11,156 | New |
| Qube Research & Technologies Ltd | 11,030 | $282.4K | 0.00% | +11,030 | New |
| Barclays PLC | 3,961 | $101.4K | 0.00% | +1,182+42.5% | Added |
| Morgan Stanley | 3,527 | $90.3K | 0.00% | +1,378+64.1% | Added |
| Bank of America Corp | 3,371 | $86.3K | 0.00% | +3,319+6,382.7% | Added |
| Northwestern Mutual Wealth Management Co | 260 | $6.66K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 190 | $4.86K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 145 | $3.71K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 100 | $2.56K | 0.00% | +100 | New |
| SBI Securities Co., Ltd. | 68 | $1.74K | 0.00% | +1+1.5% | Added |
| BNP Paribas Arbitrage, SA | 58 | $1.49K | 0.00% | −244−80.8% | Reduced |
| EverSource Wealth Advisors, LLC | 55 | $1.41K | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 22 | $564 | 0.00% | +22 | New |
| JPMorgan Chase & Co | 14 | $358 | 0.00% | +7+100.0% | Added |
| Point72 Europe (London) LLP | 13 | $332 | 0.00% | +13 | New |
| 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 |
| Royal Bank of Canada | 0 | $0 | 0.00% | −106−100.0% | Sold out |
| Ameriflex Group, Inc. | 0 | $0 | 0.00% | −83−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −34−100.0% | Sold out |