Mersana Therapeutics, Inc. - MRSN
Ownership (Schedule 13D / 13G) · latest 50 filings
· Back to all files
Visible: 0
| Filed | Form | Reporting person | Percent | Shares | SEC |
|---|---|---|---|---|---|
| Feb 17, 2026 | SCHEDULE 13G/A | Schonfeld Strategic Advisors LLC | 0.0% | 0 | View |
| Feb 17, 2026 | SCHEDULE 13G/A | 683 Capital Management, LLC | 7.03% | 351,289 | View |
| Feb 17, 2026 | SCHEDULE 13G/A | 683 Capital Partners, LP | 7.03% | 351,289 | View |
| Feb 17, 2026 | SCHEDULE 13G/A | Ari Zweiman | 7.03% | 351,289 | View |
| Jan 30, 2026 | SCHEDULE 13G/A | The Vanguard Group | 4.2% | 210,301 | View |
| Jan 09, 2026 | SCHEDULE 13G/A | Nextech Crossover I GP S.a. r.l. | 0.0% | 0 | View |
| Jan 09, 2026 | SCHEDULE 13G/A | Nextech Crossover I SCSp | 0.0% | 0 | View |
| Jan 09, 2026 | SCHEDULE 13G/A | Ian Charoub | 0.0% | 0 | View |
| Jan 09, 2026 | SCHEDULE 13G/A | Costas Constantinides | 0.0% | 0 | View |
| Jan 09, 2026 | SCHEDULE 13G/A | Rocco Sgobbo | 0.0% | 0 | View |
| Jan 08, 2026 | SCHEDULE 13D/A | — | — | — | View |
| Nov 24, 2025 | SCHEDULE 13G | 683 Capital Management, LLC | 5.47% | 273,420 | View |
| Nov 24, 2025 | SCHEDULE 13G | 683 Capital Partners, LP | 5.47% | 273,420 | View |
| Nov 24, 2025 | SCHEDULE 13G | Ari Zweiman | 5.47% | 273,420 | View |
| Nov 14, 2025 | SCHEDULE 13G | Schonfeld Strategic Advisors LLC | 5.48% | 273,579 | View |
| Nov 13, 2025 | SCHEDULE 13D/A | — | 2.6% | — | View |
Percent = "% of class represented by amount beneficially owned" for this reporting person in the filed 13D/13G.
Shares = reported beneficial ownership amount for the same row (not portfolio shares from 13F).
Amendments (/A) can repeat the same holder over time, so rows should not be summed.
Extraction is best-effort from filing text and can be missing or noisy; verify exact figures via the SEC link in each row.