Real time Form 13D and 13G transaction reports:
- 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.
- Due to inconsistent filing format, it is highly recommended that you read the orignal filing form.
- Shares have beem adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| 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 History |
| 2023-02-14 09:38 am Purchase | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | venBio Select Advisor LLC | 7,550,000 7.600% | 750,000 (+11.03%) | Filing History |
| 2023-02-13 6:04 pm Sale | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | Rho Ventures V L.P. | 604,213 0.600% | -726,974 (-54.61%) | Filing History |
| 2023-02-09 11:27 am Purchase | 2022-12-30 | 13G | Mersana Therapeutics, Inc. MRSN | VANGUARD GROUP INC | 4,449,040 4.460% | 841,609 (+23.33%) | Filing History |
| 2023-02-06 2:53 pm Sale | 2022-12-30 | 13G | Mersana Therapeutics, Inc. MRSN | WELLINGTON MANAGEMENT GROUP LLP | 0 0.000% | -5,017,078 (Position Closed) | Filing History |
| 2023-02-03 12:27 pm Purchase | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | STATE STREET CORP STT | 5,856,061 5.870% | 1,635,504 (+38.75%) | Filing History |
| 2023-01-31 1:58 pm Purchase | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 7,491,929 7.500% | 12,700 (+0.17%) | Filing History |
| 2023-01-19 4:06 pm Sale | 2022-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | MILLENNIUM MANAGEMENT LLC | 3,663,527 3.700% | -67,184 (-1.80%) | Filing History |
| 2022-05-11 5:26 pm Unchanged | 2022-05-09 | 13D | Mersana Therapeutics, Inc. MRSN | Bain Capital Life Sciences Fund II, L.P. | 4,041,733 4.200% | 0 (Unchanged) | Filing History |
| 2022-04-14 4:56 pm Purchase | 2022-04-13 | 13D | Mersana Therapeutics, Inc. MRSN | Bain Capital Life Sciences Fund II, L.P. | 4,041,733 4.800% | 747,310 (+22.68%) | Filing History |
| 2022-02-17 4:12 pm Purchase | 2022-02-15 | 13G | Mersana Therapeutics, Inc. MRSN | MILLENNIUM MANAGEMENT LLC | 3,730,711 5.200% | 3,730,711 (New Position) | Filing History |
| 2022-02-11 2:34 pm Purchase | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | STATE STREET CORP STT | 4,220,557 5.870% | 4,220,557 (New Position) | Filing History |
| 2022-02-10 08:27 am Purchase | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | VANGUARD GROUP INC | 3,607,431 5.020% | 3,607,431 (New Position) | Filing History |
| 2022-02-08 5:02 pm Unchanged | 2022-02-07 | 13D | Mersana Therapeutics, Inc. MRSN | Bain Capital Life Sciences Fund II, L.P. | 3,294,423 4.400% | 0 (Unchanged) | Filing History |
| 2022-02-04 09:21 am Purchase | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | WELLINGTON MANAGEMENT GROUP LLP | 5,017,078 6.980% | 364,012 (+7.82%) | Filing History |
| 2022-01-27 5:13 pm Unchanged | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 7,479,229 10.400% | 0 (Unchanged) | Filing History |
| 2022-01-26 09:17 am Sale | 2021-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 7,479,229 10.400% | -508,583 (-6.37%) | Filing History |
| 2022-01-03 5:10 pm Unchanged | 2021-12-29 | 13D | Mersana Therapeutics, Inc. MRSN | Bain Capital Life Sciences Fund II, L.P. | 3,294,423 4.500% | 0 (Unchanged) | Filing History |
| 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 History |
| 2021-02-12 4:17 pm Sale | 2020-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | PFIZER INC PFE | 0 0.000% | -2,209,631 (Position Closed) | Filing History |