BB BIOTECH AG 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 |
| 2023-02-14 4:18 pm Sale | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | BB BIOTECH AG | 162,648 4.100% | -2,752 (-1.66%) | Filing |
| 2021-09-15 6:23 pm Purchase | 2021-09-10 | 13G | Mersana Therapeutics, Inc. MRSN | BB BIOTECH AG | 165,400 5.800% | 165,400 (New Position) | Filing |