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, Q4 2025
Institutional positions in Assembly Biosciences, Inc. as of Dec 31, 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
- 69
- +14 vs. Q3 2025
- Shares held
- 13.7M
- +1.26M (+10.1%) vs. Q3 2025
- Total value
- $466.7M
- +$142.2M (+43.8%) vs. Q3 2025
- New holders
- 22
- 23 more added
- Sold out
- 8
- 13 more reduced
2 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Assembly Biosciences, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Gilead Sciences, Inc. | 4,505,391 | $153.2M | 7.92% | 00.0% | Unchanged |
| Farallon Capital Management, L.L.C. | 1,227,590 | $41.8M | 0.22% | 00.0% | Unchanged |
| Ra Capital Management, L.P. | 1,020,410 | $34.7M | 0.36% | 00.0% | Unchanged |
| Commodore Capital LP | 1,000,000 | $34.0M | 2.26% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 837,925 | $28.5M | 0.01% | +85,299+11.3% | Added |
| Paradigm Biocapital Advisors LP | 665,251 | $22.6M | 0.61% | +665,251 | New |
| Point72 Asset Management, L.P. | 600,609 | $20.4M | 0.03% | +304,592+102.9% | Added |
| Vanguard Group Inc | 572,898 | $19.5M | 0.00% | +70,786+14.1% | Added |
| Blackstone Group Inc. | 318,754 | $10.8M | 0.05% | −129,035−28.8% | Reduced |
| Parkman Healthcare Partners LLC | 249,357 | $8.48M | 0.81% | −1,624−0.6% | Reduced |
| Franklin Resources Inc | 210,528 | $7.16M | 0.00% | −27,641−11.6% | Reduced |
| BlackRock, Inc. | 192,296 | $6.54M | 0.00% | +22,097+13.0% | Added |
| B Group, Inc. | 175,706 | $5.98M | 4.43% | 00.0% | Unchanged |
| Adage Capital Partners GP, L.L.C. | 161,000 | $5.48M | 0.01% | +161,000 | New |
| Eversept Partners, LP | 159,676 | $5.43M | 0.30% | +159,676 | New |
| StemPoint Capital LP | 156,728 | $5.33M | 0.91% | +90,598+137.0% | Added |
| Geode Capital Management, LLC | 131,307 | $4.47M | 0.00% | +1,212+0.9% | Added |
| Marshall Wace, LLP | 129,075 | $4.39M | 0.00% | +43,860+51.5% | Added |
| Patient Square Capital LP | 127,000 | $4.32M | 0.92% | −8,182−6.1% | Reduced |
| Caption Management, LLC | 106,591 | $3.63M | 0.16% | +106,591 | New |
| Millennium Management LLC | 98,221 | $3.34M | 0.00% | +76,613+354.6% | Added |
| Susquehanna International Group, LLP | 80,394 | $2.73M | 0.00% | −50,632−38.6% | Reduced |
| Seven Fleet Capital Management LP | 73,762 | $2.51M | 1.70% | +73,762 | New |
| Superstring Capital Management LP | 65,273 | $2.22M | 1.19% | +65,273 | New |
| Schonfeld Strategic Advisors LLC | 54,235 | $1.84M | 0.01% | −67,653−55.5% | Reduced |
| Jane Street Group, LLC | 53,702 | $1.83M | 0.00% | +19,874+58.8% | Added |
| State Street Corp | 52,989 | $1.80M | 0.00% | +8,175+18.2% | Added |
| JPMorgan Chase & Co | 48,159 | $1.64M | 0.00% | +48,145+343,892.9% | Added |
| Qube Research & Technologies Ltd | 42,185 | $1.43M | 0.00% | +31,155+282.5% | Added |
| Northern Trust Corp | 41,227 | $1.40M | 0.00% | +1,272+3.2% | Added |
| Monimus Capital Management, LP | 38,301 | $1.30M | 0.86% | −3,766−9.0% | Reduced |
| Arrowstreet Capital, Limited Partnership | 37,812 | $1.29M | 0.00% | +37,812 | New |
| Palumbo Wealth Management LLC | 37,305 | $1.27M | 0.31% | +2,507+7.2% | Added |
| Goldman Sachs Group Inc | 34,794 | $1.18M | 0.00% | +17,138+97.1% | Added |
| Citadel Advisors LLC | 32,866 | $1.12M | 0.00% | −21,012−39.0% | Reduced |
| EAM Investors, LLC | 29,523 | $1.00M | 0.11% | +451+1.6% | Added |
| Trexquant Investment LP | 28,276 | $961.7K | 0.01% | +15,750+125.7% | Added |
| 683 Capital Management, LLC | 27,863 | $947.6K | 0.08% | +27,863 | New |
| Ellsworth Advisors, LLC | 29,735 | $889.4K | 0.18% | −215−0.7% | Reduced |
| Federated Hermes, Inc. | 25,394 | $863.6K | 0.00% | 00.0% | Unchanged |
| Barclays PLC | 24,741 | $841.4K | 0.00% | +20,780+524.6% | Added |
| Morgan Stanley | 22,534 | $766.4K | 0.00% | +19,007+538.9% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 20,802 | $707.5K | 0.00% | +9,646+86.5% | Added |
| ADAR1 Capital Management, LLC | 19,747 | $671.6K | 0.05% | +800+4.2% | Added |
| SEI Investments Co | 17,745 | $603.5K | 0.00% | +17,745 | New |
| Omers Administration Corp | 15,598 | $530.5K | 0.00% | +15,598 | New |
| Hudson Bay Capital Management LP | 15,050 | $511.9K | 0.00% | +15,050 | New |
| Susquehanna Portfolio Strategies, LLC | 13,903 | $472.8K | 0.01% | +13,903 | New |
| Raymond James Financial Inc | 13,082 | $444.9K | 0.00% | +13,082 | New |
| Gsa Capital Partners LLP | 12,699 | $432.0K | 0.04% | +279+2.2% | Added |
| Acadian Asset Management LLC | 12,446 | $422.0K | 0.00% | −10,844−46.6% | Reduced |
| Engineers Gate Manager LP | 10,375 | $352.9K | 0.00% | +10,375 | New |
| UBS Group AG | 9,779 | $332.6K | 0.00% | −5,984−38.0% | Reduced |
| Renaissance Technologies LLC | 9,240 | $314.3K | 0.00% | −144,371−94.0% | Reduced |
| Virtus Investment Advisers, Inc. | 7,369 | $250.6K | 0.07% | +7,369 | New |
| Charles Schwab Investment Management Inc | 6,704 | $228.0K | 0.00% | +6,704 | New |
| Bank of America Corp | 5,110 | $173.8K | 0.00% | +1,739+51.6% | Added |
| Canada Pension Plan Investment Board | 3,500 | $119.0K | 0.00% | +3,500 | New |
| Citigroup Inc | 2,201 | $74.9K | 0.00% | +2,201 | New |
| Tower Research Capital LLC (TRC) | 607 | $20.6K | 0.00% | +607 | New |
| Northwestern Mutual Wealth Management Co | 260 | $8.84K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 190 | $6.46K | 0.00% | 00.0% | Unchanged |
| Farther Finance Advisors, LLC | 154 | $5.24K | 0.00% | +154 | New |
| Advisor Group Holdings, Inc. | 100 | $3.40K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 59 | $2.01K | 0.00% | +59 | New |
| EverSource Wealth Advisors, LLC | 55 | $1.87K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 32 | $1.09K | 0.00% | +32 | New |
| Quadrant Capital Group LLC | 22 | $749 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 2 | $68 | 0.00% | −56−96.6% | Reduced |
| Frazier Life Sciences Management, L.P. | 0 | $0 | 0.00% | −456,249−100.0% | Sold out |
| MPM Oncology Impact Management LP | 0 | $0 | 0.00% | −39,665−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −24,501−100.0% | Sold out |
| Quadrature Capital Ltd | 0 | $0 | 0.00% | −17,935−100.0% | Sold out |
| Bridgeway Capital Management, LLC | 0 | $0 | 0.00% | −15,225−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −12,806−100.0% | Sold out |
| Wells Fargo & Company | 0 | $0 | 0.00% | −145−100.0% | Sold out |
| SBI Securities Co., Ltd. | 0 | $0 | 0.00% | −68−100.0% | Sold out |
| Cubist Systematic Strategies, LLC | – | – | – | – | Not filed |
| Point72 Europe (London) LLP | – | – | – | – | Not filed |