The Vanguard Group 13D and 13G filings for Mersana Therapeutics, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2024-02-13 5:09 pm Purchase | 2023-12-29 | 13G | Mersana Therapeutics, Inc. MRSN | The Vanguard Group | 6,237,588 5.170% | 1,788,548 (+40.20%) | Filing |
| 2023-02-09 11:27 am Purchase | 2022-12-30 | 13G | Mersana Therapeutics, Inc. MRSN | The Vanguard Group | 4,449,040 4.460% | 841,609 (+23.33%) | Filing |
| 2022-02-10 08:27 am Purchase | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | The Vanguard Group | 3,607,431 5.020% | 3,607,431 (New Position) | Filing |