Question 1

How many shares of MRSN does BlackRock, Inc. own?

Accepted Answer

BlackRock, Inc. previously held 0 shares of MRSN (MERSANA THERAPEUTICS INC) before exiting the position in 2026-Q1.

Question 2

What is BlackRock, Inc.'s MRSN position worth?

Accepted Answer

BlackRock, Inc.'s MRSN position was last reported at $0 in 2026-Q1 before the exit.

Question 3

Is BlackRock, Inc. buying or selling MRSN?

Accepted Answer

In 2026-Q1, BlackRock, Inc. exited their MRSN position entirely (-100.0% change in shares).

Question 4

When did BlackRock, Inc. first buy MRSN?

Accepted Answer

Based on available 13F filings, BlackRock, Inc. first reported a position in MRSN in 2024-Q4. They have held the position across 6 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q1 Latest	Exited	0	-100.0%	$0	0.0%	$29.08	0
2025-Q4	Decreased	69,210	-28.1%	$2M	0.0%	$28.65	0
2025-Q3	Decreased	96,193	-97.4%	$746,458	0.0%	$7.79	0
2025-Q2	Decreased	3.8M	-54.8%	$1.1M	0.0%	$7.28	0
2025-Q1	Decreased	8.3M	-9.6%	$2.9M	0.0%	$9.49	0
2024-Q4	New	9.2M	-	$13.2M	0.0%	$35.50	39

MRSN6 quarters

MRSN
6 quarters