VANGUARD GROUP INC 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 |
| 2026-01-30 2:16 pm Sale | 2025-12-31 | 13G | MERSANA THERAPEUTICS INC N MRSN | VANGUARD GROUP INC | 210,301 4.200% | -124,810 (-37.24%) | Filing |