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, Q2 2026
Institutional positions in Assembly Biosciences, Inc. as of Jun 30, 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
- 92
- +18 vs. Q1 2026
- Shares held
- 18.7M
- +5.84M (+45.3%) vs. Q1 2026
- Total value
- $514.8M
- +$156.8M (+43.8%) vs. Q1 2026
- New holders
- 33
- 35 more added
- Sold out
- 15
- 17 more reduced
1 institution that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Assembly Biosciences, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −18,904−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −16,799−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −10,917−100.0% | Sold out |
| Omers Administration Corp | 0 | $0 | 0.00% | −8,100−100.0% | Sold out |
| Aquatic Capital Management LLC | 0 | $0 | 0.00% | −220−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −59−100.0% | Sold out |
| Fifth Third Bancorp | 0 | $0 | 0.00% | −57−100.0% | Sold out |
| Janus Henderson Group PLC | – | – | – | – | Not filed |