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 | 4,066,200 4.100% |
-68,800 (-1.66%) |
Filing |
| 2021-09-15 6:23 pm Purchase |
2021-09-10 | 13G | Mersana Therapeutics, Inc. MRSN |
BB BIOTECH AG | 4,135,000 5.800% |
4,135,000 (New Position) |
Filing |