Mersana Therapeutics, Inc.

MRSNDelisted Jan 6, 2026

Industry: Pharmaceutical Preparations
SEC CIK: 0001442836

SEC filings (opens in a new tab)

Mersana Therapeutics, Inc. was delisted on Jan 6, 2026; its insiders filed their last Form 4 on Jan 6, 2026; 51 institutions reported holding it in 13F filings for Q4 2025, worth $64.8M in total; no superinvestor held it.

Q4 2024 vs. Q3 2024

How the institutions holding Mersana Therapeutics, Inc. changed between Q3 2024 and Q4 2024.

All holders in Q4 2024 All holders in Q3 2024

13F holders of MRSN: Q3 2024 compared with Q4 2024
Measure	Q3 2024	Of which not filed for Q4 2024	Q4 2024	Change
Holders	116	2	132	+18
Shares	116.1M	524.0K	104.3M	−11.3M (−9.7%)
Value	$219.4M	$1.05M	$149.2M	−$69.2M (−31.7%)

2 institutions that held it in Q3 2024 haven't filed for Q4 2024 yet. Not filing isn't selling, so the changes leave them out.

New holders (30)

Institutions that held Mersana Therapeutics, Inc. at the end of Q4 2024 but not at the end of Q3 2024.

Institutions new to MRSN in Q4 2024
Institution	Shares	Value	% of portfolio
Novo Holdings A/S	4,250,000	$6.08M	0.37%
Boxer Capital Management, LLC	2,635,000	$3.77M	0.32%
Catalio Capital Management, LP	1,705,036	$2.44M	0.53%
Sphera Funds Management Ltd.	690,272	$987.1K	0.18%
ExodusPoint Capital Management, LP	194,153	$278.0K	0.00%
Mackenzie Financial Corp	91,956	$131.5K	0.00%
Susquehanna Fundamental Investments, LLC	91,852	$131.3K	0.00%
SEI Investments Co	69,527	$99.4K	0.00%
Oxford Asset Management LLP	65,386	$93.5K	0.04%
Avanza Fonder AB	56,298	$80.5K	0.00%
Cubist Systematic Strategies, LLC	45,296	$64.8K	0.00%
China Universal Asset Management Co., Ltd.	26,194	$37.5K	0.00%
Police & Firemen's Retirement System of New Jersey	22,593	$32.3K	0.00%
Engineers Gate Manager LP	17,084	$24.4K	0.00%
Marshall Wace, LLP	15,600	$22.3K	0.00%
Aquatic Capital Management LLC	14,551	$20.8K	0.00%
Bayesian Capital Management, LP	12,600	$18.0K	0.00%
Lazard Asset Management LLC	12,104	$17.0K	0.00%
Wolverine Trading, LLC	10,869	$15.4K	0.00%
CIBC World Markets Corp	10,616	$15.2K	0.00%
Mirae Asset Global Investments Co., Ltd.	4,117	$6.18K	0.00%
GF Fund Management Co. Ltd.	2,594	$3.71K	0.00%
Skopos Labs, Inc.	2,517	$3.60K	0.00%
Point72 (DIFC) Ltd	2,203	$3.15K	0.00%
R Squared Ltd	1,060	$1.52K	0.00%
Optiver Holding B.V.	705	$1.01K	0.00%
Signaturefd, LLC	286	$409	0.00%
SBI Securities Co., Ltd.	218	$312	0.00%
IFP Advisors, Inc	2	$3	0.00%
Point72 Asia (Singapore) Pte. Ltd.	1	$1	0.00%

Sold out (12)

Institutions that held Mersana Therapeutics, Inc. at the end of Q3 2024 and filed for Q4 2024 without it.

Institutions that sold out of MRSN in Q4 2024
Institution	Shares, Q3 2024	Value, Q3 2024
Boxer Capital, LLC	1,817,000	$3.43M
Silverarc Capital Management, LLC	1,585,786	$3.00M
Balyasny Asset Management LLC	535,819	$1.01M
Susquehanna Portfolio Strategies, LLC	82,713	$156.3K
Simplex Trading, LLC	72,844	$137.0K
Acadian Asset Management LLC	24,394	$46.0K
Dynamic Technology Lab Private Ltd	18,095	$34.0K
Caption Management, LLC	10,200	$19.3K
Catalyst Funds Management Pty Ltd	1,700	$3.21K
Nordwand Advisors, LLC	1,500	$2.83K
Jones Financial Companies LLLP	200	$370
Capital Performance Advisors LLP	11	$21

Not filed for Q4 2024 yet (2)

Institutions that held Mersana Therapeutics, Inc. at the end of Q3 2024 and haven't filed a 13F for Q4 2024. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding MRSN in Q3 2024 that haven't filed for Q4 2024
Institution	Shares, Q3 2024	Value, Q3 2024
ClariVest Asset Management LLC	500,498	$1.01M
Prio Wealth Limited Partnership	23,529	$44.5K