BlackRock, Inc. (BLK) 13D/13G Filings for Mersana Therapeutics, Inc. (MRSN)

BlackRock, Inc. 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.
Time period
Reported
DateTime		 Transaction
Date		 Type Company
Symbol		 Filed By
Symbol		 Shares Owned
% Owned		 Shares Vs. Prev Report View
2025-04-17
09:35 am
Sale		 2025-03-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 8,323,869
6.700%		 -881,313decrease
(-9.57%)		 Filing
2025-02-05
1:23 pm
Purchase		 2024-12-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 9,205,182
8.000%		 1,360,900increase
(+17.35%)		 Filing
2024-01-29
3:26 pm
Purchase		 2023-12-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 7,844,282
6.500%		 352,353increase
(+4.70%)		 Filing
2023-01-31
1:58 pm
Purchase		 2022-12-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 7,491,929
7.500%		 12,700increase
(+0.17%)		 Filing
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
2022-01-26
09:17 am
Sale		 2021-12-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 7,479,229
10.400%		 -508,583decrease
(-6.37%)		 Filing
2021-01-26
6:52 pm
Purchase		 2020-12-31 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 7,987,812
11.700%		 850,072increase
(+11.91%)		 Filing
2020-07-10
10:39 am
Purchase		 2020-06-30 13G Mersana Therapeutics, Inc.
MRSN		 BlackRock Inc.
BLK		 7,137,740
10.700%		 4,672,421increase
(+189.53%)		 Filing