WELLINGTON MANAGEMENT CO LLP 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 |
| 2023-02-06 2:53 pm Sale | 2022-12-30 | 13G | Mersana Therapeutics, Inc. MRSN | WELLINGTON MANAGEMENT CO LLP | 0 0.000% | -5,017,078 (Position Closed) | Filing |
| 2022-02-04 09:21 am Purchase | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | WELLINGTON MANAGEMENT CO LLP | 5,017,078 6.980% | 364,012 (+7.82%) | Filing |
| 2021-02-04 09:51 am Purchase | 2020-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | WELLINGTON MANAGEMENT CO LLP | 4,653,066 6.790% | 3,686,164 (+381.23%) | Filing |