EcoR1 Capital, LLC
- SEC CIK
- 0001587114
- Latest filing
- Aug 14, 2026
MRSN holding history
Mersana Therapeutics, Inc. in every 13F filed by EcoR1 Capital, LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
MRSN overviewAll 13F holders of MRSNFull Q2 2026 holdings
- Shares (Q1 2025)
- 0
- Sold out in Q1 2025
- Value
- $0
- % of portfolio
- 0.0%
- Quarters held
- 8
- Since Q1 2022
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q1 2025 | 0 | $0 | 0.0% | −11,328,000−100.0% | Sold out | Holders |
| Q4 2024 | 11,328,000 | $16.2M | 0.6% | −8,036,688−41.5% | Reduced | Holders |
| Q3 2024 | 19,364,688 | $36.6M | 1.3% | 00.0% | Unchanged | Holders |
| Q2 2024 | 19,364,688 | $38.9M | 1.2% | 00.0% | Unchanged | Holders |
| Q1 2024 | 19,364,688 | $86.8M | 2.2% | 00.0% | Unchanged | Holders |
| Q4 2023 | 19,364,688 | $44.9M | 1.2% | 00.0% | Unchanged | Holders |
| Q3 2023 | 19,364,688 | $24.6M | 0.8% | +19,364,688 | New | Holders |
| Q3 2022 | 0 | $0 | 0.0% | −310,960−100.0% | Sold out | Holders |
| Q2 2022 | 310,960 | $1.44M | 0.1% | −15,618−4.8% | Reduced | Holders |
| Q1 2022 | 326,578 | $1.30M | <0.1% | +326,578 | New | Holders |