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
- 13.8M
- +602.7K (+4.6%) vs. Q4 2025
- Total value
- $381.5M
- −$65.7M (−14.7%) 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 | $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, 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 |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | 4,505,391 | $125.0M | 5.90% | 00.0% | Unchanged |
| Farallon Capital Management, L.L.C. | 1,227,590 | $34.1M | 0.20% | 00.0% | Unchanged |
| Ra Capital Management, L.P. | 1,020,410 | $28.3M | 0.30% | 00.0% | Unchanged |
| Commodore Capital LP | 1,000,000 | $27.8M | 1.61% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 849,309 | $23.5M | 0.01% | +11,384+1.4% | Added |
| Paradigm Biocapital Advisors LP | 665,251 | $18.5M | 0.38% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 490,447 | $13.6M | 0.00% | +490,447 | New |
| Parkman Healthcare Partners LLC | 411,227 | $11.4M | 1.18% | +161,870+64.9% | Added |
| StemPoint Capital LP | 370,870 | $10.3M | 1.00% | +214,142+136.6% | Added |
| Point72 Asset Management, L.P. | 344,105 | $9.55M | 0.02% | −256,504−42.7% | Reduced |
| Blackstone Group Inc. | 296,855 | $8.24M | 0.03% | −21,899−6.9% | Reduced |
| Millennium Management LLC | 233,650 | $6.48M | 0.00% | +135,429+137.9% | Added |
| BlackRock, Inc. | 202,743 | $5.63M | 0.00% | +10,447+5.4% | Added |
| B Group, Inc. | 175,706 | $4.88M | 3.61% | 00.0% | Unchanged |
| Marshall Wace, LLP | 163,400 | $4.53M | 0.00% | +34,325+26.6% | Added |
| Adage Capital Partners GP, L.L.C. | 161,000 | $4.47M | 0.01% | 00.0% | Unchanged |
| Patient Square Capital LP | 136,315 | $3.78M | 0.67% | +9,315+7.3% | Added |
| Geode Capital Management, LLC | 132,971 | $3.69M | 0.00% | +1,664+1.3% | Added |
| Schonfeld Strategic Advisors LLC | 120,500 | $3.34M | 0.03% | +66,265+122.2% | Added |
| Caption Management, LLC | 81,841 | $2.27M | 0.11% | −24,750−23.2% | Reduced |
| HighVista Strategies LLC | 74,735 | $2.07M | 0.57% | +74,735 | New |
| Vanguard Fiduciary Trust Co | 71,606 | $1.99M | 0.00% | +71,606 | New |
| Qube Research & Technologies Ltd | 69,256 | $1.92M | 0.00% | +27,071+64.2% | Added |
| State Street Corp | 56,689 | $1.57M | 0.00% | +3,700+7.0% | Added |
| Seven Fleet Capital Management LP | 56,147 | $1.56M | 0.49% | −17,615−23.9% | Reduced |
| JPMorgan Chase & Co | 53,962 | $1.44M | 0.00% | +5,803+12.0% | Added |
| Monimus Capital Management, LP | 48,390 | $1.34M | 0.37% | +10,089+26.3% | Added |
| Gsa Capital Partners LLP | 45,049 | $1.25M | 0.08% | +32,350+254.7% | Added |
| Northern Trust Corp | 41,014 | $1.14M | 0.00% | −213−0.5% | Reduced |
| Eversept Partners, LP | 40,889 | $1.13M | 0.07% | −118,787−74.4% | Reduced |
| Arrowstreet Capital, Limited Partnership | 39,446 | $1.09M | 0.00% | +1,634+4.3% | Added |
| Goldman Sachs Group Inc | 36,205 | $1.00M | 0.00% | +1,411+4.1% | Added |
| Jane Street Group, LLC | 34,499 | $957.3K | 0.00% | −19,203−35.8% | Reduced |
| Morgan Stanley | 33,055 | $917.3K | 0.00% | +10,521+46.7% | Added |
| Susquehanna International Group, LLP | 32,949 | $914.3K | 0.00% | −47,445−59.0% | Reduced |
| 683 Capital Management, LLC | 27,863 | $773.2K | 0.07% | 00.0% | Unchanged |
| Barclays PLC | 27,050 | $750.6K | 0.00% | +2,309+9.3% | Added |
| Wellington Management Group LLP | 26,496 | $735.3K | 0.00% | +26,496 | New |
| Citadel Advisors LLC | 25,437 | $705.9K | 0.00% | −7,429−22.6% | Reduced |
| Squarepoint Ops LLC | 23,804 | $660.6K | 0.00% | +23,804 | New |
| Trexquant Investment LP | 22,741 | $631.1K | 0.00% | −5,535−19.6% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 21,761 | $603.9K | 0.00% | +959+4.6% | Added |
| Two Sigma Investments, LP | 20,550 | $570.3K | 0.00% | +20,550 | New |
| ADAR1 Capital Management, LLC | 19,947 | $553.5K | 0.03% | +200+1.0% | Added |
| Palumbo Wealth Management LLC | 19,643 | $545.1K | 0.13% | −17,662−47.3% | Reduced |
| Federated Hermes, Inc. | 18,904 | $524.6K | 0.00% | −6,490−25.6% | Reduced |
| Vanguard Portfolio Management LLC | 17,723 | $491.8K | 0.00% | +17,723 | New |
| Hudson Bay Capital Management LP | 16,799 | $466.2K | 0.00% | +1,749+11.6% | Added |
| Renaissance Technologies LLC | 15,651 | $434.3K | 0.00% | +6,411+69.4% | Added |
| Susquehanna Portfolio Strategies, LLC | 14,100 | $391.3K | 0.01% | +197+1.4% | Added |
| EntryPoint Capital, LLC | 12,384 | $343.7K | 0.10% | +12,384 | New |
| Brevan Howard Capital Management LP | 11,112 | $308.4K | 0.00% | +11,112 | New |
| Jump Financial, LLC | 10,917 | $302.9K | 0.00% | +10,917 | New |
| Bank of America Corp | 10,902 | $302.5K | 0.00% | +5,792+113.3% | Added |
| XTX Topco Ltd | 10,785 | $299.3K | 0.01% | +10,785 | New |
| Engineers Gate Manager LP | 9,423 | $261.5K | 0.00% | −952−9.2% | Reduced |
| American Century Companies Inc | 9,154 | $254.0K | 0.00% | +9,154 | New |
| Canada Pension Plan Investment Board | 8,500 | $235.9K | 0.00% | +5,000+142.9% | Added |
| Omers Administration Corp | 8,100 | $224.8K | 0.00% | −7,498−48.1% | Reduced |
| Virtus Investment Advisers, Inc. | 7,553 | $209.6K | 0.06% | +184+2.5% | Added |
| Citigroup Inc | 6,483 | $179.9K | 0.00% | +4,282+194.5% | Added |
| Vanguard Global Advisers, LLC | 4,615 | $128.1K | 0.00% | +4,615 | New |
| Tower Research Capital LLC (TRC) | 544 | $15.1K | 0.00% | −63−10.4% | Reduced |
| UBS Group AG | 364 | $10.1K | 0.00% | −9,415−96.3% | Reduced |
| Northwestern Mutual Wealth Management Co | 260 | $7.21K | 0.00% | 00.0% | Unchanged |
| Aquatic Capital Management LLC | 220 | $6.11K | 0.00% | +220 | New |
| Rhumbline Advisers | 190 | $5.27K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 149 | $4.13K | 0.00% | +147+7,350.0% | Added |
| Accent Capital Management, LLC | 142 | $3.94K | 0.00% | +142 | New |
| Advisor Group Holdings, Inc. | 100 | $2.77K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 59 | $1.64K | 0.00% | 00.0% | Unchanged |
| Fifth Third Bancorp | 57 | $1.58K | 0.00% | +57 | New |
| EverSource Wealth Advisors, LLC | 55 | $1.53K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 29 | $805 | 0.00% | −3−9.4% | Reduced |
| Royal Bank of Canada | 16 | $0 | 0.00% | +16 | New |
| 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 |