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 |
| 2025-08-14 4:31 pm Purchase | 2025-06-30 | 13G | Mersana Therapeutics, Inc. MRSN | Schonfeld Strategic Advisors LLC | 5,673,852 4.550% | 5,369,289 (+1762.95%) | Filing History |
| 2025-07-17 7:54 pm Sale | 2025-06-30 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 150,475 3.000% | -182,480 (-54.81%) | Filing History |
| 2025-05-15 5:48 pm Sale | 2025-03-31 | 13G | Mersana Therapeutics, Inc. MRSN | Venrock Healthcare Capital Partners III, L.P. | 142,973 2.900% | -267,339 (-65.16%) | Filing History |
| 2025-05-15 4:31 pm Purchase | 2025-03-31 | 13G | Mersana Therapeutics, Inc. MRSN | Schonfeld Strategic Advisors LLC | 304,563 6.110% | 304,563 (New Position) | Filing History |
| 2025-05-15 2:16 pm Sale | 2025-03-31 | 13G | Mersana Therapeutics, Inc. MRSN | EcoR1 Capital, LLC | 0 0.000% | -463,138 (Position Closed) | Filing History |
| 2025-04-30 11:23 am Purchase | 2025-03-31 | 13G | Mersana Therapeutics, Inc. MRSN | The Vanguard Group | 335,111 6.720% | 85,607 (+34.31%) | Filing History |
| 2025-04-17 09:35 am Sale | 2025-03-31 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 332,955 6.700% | -35,253 (-9.57%) | Filing History |
| 2025-02-14 6:15 pm Sale | 2024-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | Venrock Healthcare Capital Partners III, L.P. | 410,312 8.300% | -42,808 (-9.45%) | Filing History |
| 2025-02-05 1:23 pm Purchase | 2024-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | BlackRock Inc. BLK | 368,207 8.000% | 54,436 (+17.35%) | Filing History |
| 2024-12-26 4:29 pm Unchanged | 2024-12-20 | 13G | Mersana Therapeutics, Inc. MRSN | Nextech Crossover I GP S.a. r.l. | 482,690 10.400% | 0 (Unchanged) | Filing History |
| 2024-12-23 7:50 pm Sale | 2024-12-19 | 13G | Mersana Therapeutics, Inc. MRSN | EcoR1 Capital, LLC | 463,138 9.990% | -311,450 (-40.21%) | Filing History |
| 2024-11-15 4:45 pm Purchase | 2024-11-13 | 13D | Mersana Therapeutics, Inc. MRSN | Bain Capital Life Sciences Fund II, L.P. | 198,720 4.000% | 37,051 (+22.92%) | Filing History |
| 2024-11-14 5:45 pm Purchase | 2024-09-30 | 13G | Mersana Therapeutics, Inc. MRSN | Nextech Crossover I GP S.a. r.l. | 482,690 9.800% | 232,736 (+93.11%) | Filing History |
| 2024-11-14 06:01 am Sale | 2024-09-30 | 13G | Mersana Therapeutics, Inc. MRSN | Balyasny Asset Management L.P. | 21,433 0.440% | -366,493 (-94.48%) | Filing History |
| 2024-10-15 06:55 am Sale | 2024-10-11 | 13G | Mersana Therapeutics, Inc. MRSN | SILVERARC CAPITAL MANAGEMENT LLC | 70,163 1.430% | -186,642 (-72.68%) | Filing History |
| 2024-05-17 08:26 am Purchase | 2024-05-14 | 13G | Mersana Therapeutics, Inc. MRSN | Nextech Crossover I GP S.a. r.l. | 249,954 5.100% | 249,954 (New Position) | Filing History |
| 2024-02-14 8:56 pm Purchase | 2023-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | Venrock Healthcare Capital Partners III, L.P. | 453,120 9.400% | 66,000 (+17.05%) | Filing History |
| 2024-02-14 8:43 pm Purchase | 2023-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | SILVERARC CAPITAL MANAGEMENT LLC | 256,805 5.300% | 256,805 (New Position) | Filing History |
| 2024-02-14 6:55 pm Sale | 2023-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | ORBIMED ADVISORS LLC | 0 0.000% | -283,313 (Position Closed) | Filing History |
| 2024-02-14 09:20 am Sale | 2023-12-31 | 13G | Mersana Therapeutics, Inc. MRSN | Avoro Capital Advisors LLC | 0 0.000% | -302,000 (Position Closed) | Filing History |