UBS Oconnor LLC
- SEC CIK
- 0001132716
- Latest filing
- Aug 14, 2026
MRSN holding history
Mersana Therapeutics, Inc. in every 13F filed by UBS Oconnor 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 Q4 2025 holdings
- Shares (Q2 2025)
- 0
- Sold out in Q2 2025
- Value
- $0
- % of portfolio
- 0.0%
- Quarters held
- 10
- Since Q2 2022
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q2 2025 | 0 | $0 | 0.0% | −97,731−100.0% | Sold out | Holders |
| Q1 2025 | 97,731 | $33.6K | <0.1% | −312,298−76.2% | Reduced | Holders |
| Q4 2024 | 410,029 | $586.3K | <0.1% | −160,000−28.1% | Reduced | Holders |
| Q3 2024 | 570,029 | $1.08M | <0.1% | +25,736+4.7% | Added | Holders |
| Q2 2024 | 544,293 | $1.09M | <0.1% | +110,000+25.3% | Added | Holders |
| Q1 2024 | 434,293 | $1.95M | 0.1% | −121,352−21.8% | Reduced | Holders |
| Q4 2023 | 555,645 | $1.29M | <0.1% | +259,231+87.5% | Added | Holders |
| Q3 2023 | 296,414 | $376.4K | <0.1% | +296,414 | New | Holders |
| Q2 2023 | 0 | $0 | 0.0% | −462,699−100.0% | Sold out | Holders |
| Q1 2023 | 462,699 | $1.90M | <0.1% | +462,699 | New | Holders |
| Q4 2022 | 0 | $0 | 0.0% | −376,496−100.0% | Sold out | Holders |
| Q3 2022 | 376,496 | $2.54M | <0.1% | −114,552−23.3% | Reduced | Holders |
| Q2 2022 | 491,048 | $2.27M | <0.1% | +491,048 | New | Holders |