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 |
| 2025-04-30 11:23 am Purchase | 2025-03-31 | 13G | MERSANA THERAPEUTICS INC MRSN | The Vanguard Group | 335,111 6.720% | 85,607 (+34.31%) | Filing |
| 2024-02-13 5:09 pm Purchase | 2023-12-29 | 13G | MERSANA THERAPEUTICS INC MRSN | The Vanguard Group | 249,504 5.170% | 71,542 (+40.20%) | Filing |
| 2023-02-09 11:27 am Purchase | 2022-12-30 | 13G | MERSANA THERAPEUTICS INC MRSN | The Vanguard Group | 177,962 4.460% | 33,665 (+23.33%) | Filing |
| 2022-02-10 08:27 am Purchase | 2021-12-31 | 13G | MERSANA THERAPEUTICS INC MRSN | The Vanguard Group | 144,297 5.020% | 144,297 (New Position) | Filing |