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, Q1 2026
Institutional positions in Assembly Biosciences, Inc. as of Mar 31, 2026. 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
- 75
- +7 vs. Q4 2025
- Shares held
- 13.6M
- +417.3K (+3.2%) vs. Q4 2025
- Total value
- $376.4M
- −$70.8M (−15.8%) vs. Q4 2025
- New holders
- 17
- 28 more added
- Sold out
- 10
- 17 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Assembly Biosciences, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Royal Bank of Canada | 16 | $0 | 0.00% | +16 | New |
| Allworth Financial LP | 29 | $805 | 0.00% | −3−9.4% | Reduced |
| EverSource Wealth Advisors, LLC | 55 | $1.53K | 0.00% | 00.0% | Unchanged |
| Fifth Third Bancorp | 57 | $1.58K | 0.00% | +57 | New |
| US Bancorp | 59 | $1.64K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 100 | $2.77K | 0.00% | 00.0% | Unchanged |
| Accent Capital Management, LLC | 142 | $3.94K | 0.00% | +142 | New |
| BNP Paribas Arbitrage, SA | 149 | $4.13K | 0.00% | +147+7,350.0% | Added |
| Rhumbline Advisers | 190 | $5.27K | 0.00% | 00.0% | Unchanged |
| Aquatic Capital Management LLC | 220 | $6.11K | 0.00% | +220 | New |
| Northwestern Mutual Wealth Management Co | 260 | $7.21K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 364 | $10.1K | 0.00% | −9,415−96.3% | Reduced |
| Tower Research Capital LLC (TRC) | 544 | $15.1K | 0.00% | −63−10.4% | Reduced |
| Vanguard Global Advisers, LLC | 4,615 | $128.1K | 0.00% | +4,615 | New |
| Citigroup Inc | 6,483 | $179.9K | 0.00% | +4,282+194.5% | Added |
| Virtus Investment Advisers, Inc. | 7,553 | $209.6K | 0.06% | +184+2.5% | Added |
| Omers Administration Corp | 8,100 | $224.8K | 0.00% | −7,498−48.1% | Reduced |
| Canada Pension Plan Investment Board | 8,500 | $235.9K | 0.00% | +5,000+142.9% | Added |
| American Century Companies Inc | 9,154 | $254.0K | 0.00% | +9,154 | New |
| Engineers Gate Manager LP | 9,423 | $261.5K | 0.00% | −952−9.2% | Reduced |
| XTX Topco Ltd | 10,785 | $299.3K | 0.01% | +10,785 | New |
| Bank of America Corp | 10,902 | $302.5K | 0.00% | +5,792+113.3% | Added |
| Jump Financial, LLC | 10,917 | $302.9K | 0.00% | +10,917 | New |
| Brevan Howard Capital Management LP | 11,112 | $308.4K | 0.00% | +11,112 | New |
| EntryPoint Capital, LLC | 12,384 | $343.7K | 0.10% | +12,384 | New |
| Susquehanna Portfolio Strategies, LLC | 14,100 | $391.3K | 0.01% | +197+1.4% | Added |
| Renaissance Technologies LLC | 15,651 | $434.3K | 0.00% | +6,411+69.4% | Added |
| Hudson Bay Capital Management LP | 16,799 | $466.2K | 0.00% | +1,749+11.6% | Added |
| Vanguard Portfolio Management LLC | 17,723 | $491.8K | 0.00% | +17,723 | New |
| Federated Hermes, Inc. | 18,904 | $524.6K | 0.00% | −6,490−25.6% | Reduced |
| Palumbo Wealth Management LLC | 19,643 | $545.1K | 0.13% | −17,662−47.3% | Reduced |
| ADAR1 Capital Management, LLC | 19,947 | $553.5K | 0.03% | +200+1.0% | Added |
| Two Sigma Investments, LP | 20,550 | $570.3K | 0.00% | +20,550 | New |
| Connor, Clark & Lunn Investment Management Ltd. | 21,761 | $603.9K | 0.00% | +959+4.6% | Added |
| Trexquant Investment LP | 22,741 | $631.1K | 0.00% | −5,535−19.6% | Reduced |
| Squarepoint Ops LLC | 23,804 | $660.6K | 0.00% | +23,804 | New |
| Citadel Advisors LLC | 25,437 | $705.9K | 0.00% | −7,429−22.6% | Reduced |
| Wellington Management Group LLP | 26,496 | $735.3K | 0.00% | +26,496 | New |
| Barclays PLC | 27,050 | $750.6K | 0.00% | +2,309+9.3% | Added |
| 683 Capital Management, LLC | 27,863 | $773.2K | 0.07% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 32,949 | $914.3K | 0.00% | −47,445−59.0% | Reduced |
| Morgan Stanley | 33,055 | $917.3K | 0.00% | +10,521+46.7% | Added |
| Jane Street Group, LLC | 34,499 | $957.3K | 0.00% | −19,203−35.8% | Reduced |
| Goldman Sachs Group Inc | 36,205 | $1.00M | 0.00% | +1,411+4.1% | Added |
| Arrowstreet Capital, Limited Partnership | 39,446 | $1.09M | 0.00% | +1,634+4.3% | Added |
| Eversept Partners, LP | 40,889 | $1.13M | 0.07% | −118,787−74.4% | Reduced |
| Northern Trust Corp | 41,014 | $1.14M | 0.00% | −213−0.5% | Reduced |
| Gsa Capital Partners LLP | 45,049 | $1.25M | 0.08% | +32,350+254.7% | Added |
| Monimus Capital Management, LP | 48,390 | $1.34M | 0.37% | +10,089+26.3% | Added |
| JPMorgan Chase & Co | 53,962 | $1.44M | 0.00% | +5,803+12.0% | Added |
| Seven Fleet Capital Management LP | 56,147 | $1.56M | 0.49% | −17,615−23.9% | Reduced |
| State Street Corp | 56,689 | $1.57M | 0.00% | +3,700+7.0% | Added |
| Qube Research & Technologies Ltd | 69,256 | $1.92M | 0.00% | +27,071+64.2% | Added |
| Vanguard Fiduciary Trust Co | 71,606 | $1.99M | 0.00% | +71,606 | New |
| HighVista Strategies LLC | 74,735 | $2.07M | 0.57% | +74,735 | New |
| Caption Management, LLC | 81,841 | $2.27M | 0.11% | −24,750−23.2% | Reduced |
| Schonfeld Strategic Advisors LLC | 120,500 | $3.34M | 0.03% | +66,265+122.2% | Added |
| Geode Capital Management, LLC | 132,971 | $3.69M | 0.00% | +1,664+1.3% | Added |
| Patient Square Capital LP | 136,315 | $3.78M | 0.67% | +9,315+7.3% | Added |
| Adage Capital Partners GP, L.L.C. | 161,000 | $4.47M | 0.01% | 00.0% | Unchanged |
| Marshall Wace, LLP | 163,400 | $4.53M | 0.00% | +34,325+26.6% | Added |
| B Group, Inc. | 175,706 | $4.88M | 3.61% | 00.0% | Unchanged |
| StemPoint Capital LP | 185,435 | $5.15M | 0.99% | +28,707+18.3% | Added |
| BlackRock, Inc. | 202,743 | $5.63M | 0.00% | +10,447+5.4% | Added |
| Millennium Management LLC | 233,650 | $6.48M | 0.00% | +135,429+137.9% | Added |
| Blackstone Group Inc. | 296,855 | $8.24M | 0.03% | −21,899−6.9% | Reduced |
| Point72 Asset Management, L.P. | 344,105 | $9.55M | 0.02% | −256,504−42.7% | Reduced |
| Parkman Healthcare Partners LLC | 411,227 | $11.4M | 1.18% | +161,870+64.9% | Added |
| Vanguard Capital Management LLC | 490,447 | $13.6M | 0.00% | +490,447 | New |
| Paradigm Biocapital Advisors LP | 665,251 | $18.5M | 0.38% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 849,309 | $23.5M | 0.01% | +11,384+1.4% | Added |
| Commodore Capital LP | 1,000,000 | $27.8M | 1.61% | 00.0% | Unchanged |
| Ra Capital Management, L.P. | 1,020,410 | $28.3M | 0.30% | 00.0% | Unchanged |
| Farallon Capital Management, L.L.C. | 1,227,590 | $34.1M | 0.20% | 00.0% | Unchanged |
| Gilead Sciences, Inc. | 4,505,391 | $125.0M | 5.90% | 00.0% | Unchanged |
| Franklin Resources Inc | 0 | $0 | 0.00% | −210,528−100.0% | Sold out |
| Superstring Capital Management LP | 0 | $0 | 0.00% | −65,273−100.0% | Sold out |
| EAM Investors, LLC | 0 | $0 | 0.00% | −29,523−100.0% | Sold out |
| Ellsworth Advisors, LLC | 0 | $0 | 0.00% | −29,735−100.0% | Sold out |
| SEI Investments Co | 0 | $0 | 0.00% | −17,745−100.0% | Sold out |
| Raymond James Financial Inc | 0 | $0 | 0.00% | −13,082−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −12,446−100.0% | Sold out |
| Charles Schwab Investment Management Inc | 0 | $0 | 0.00% | −6,704−100.0% | Sold out |
| Farther Finance Advisors, LLC | 0 | $0 | 0.00% | −154−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −22−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |