Mersana Therapeutics Inc (MRSN)

Q4 2025 vs Q1 2026

Comparing institutional holders between quarters

Compare Detailed Historical Funds Options 13D/13G Peers Targeting Trading Summary Profile

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IFP Advisors, Inc

UNCHANGED

Shares3 from 3

Change0 (0%)

Value$87 ($0)

Filed 2026-04-13

Nextech Invest Ltd.

CLOSED

Shares0 from 482,689

Change-482,689 (-100%)

Value$0 (-$14.0M)

Filed 2026-05-15

Bain Capital Life Sciences Investors, LLC

CLOSED

Shares0 from 346,545

Change-346,545 (-100%)

Value$0 (-$10.0M)

Filed 2026-05-15

Rock Springs Capital Management LP

CLOSED

Shares0 from 152,586

Change-152,586 (-100%)

Value$0 (-$4.4M)

Filed 2026-05-15

Knott David M Jr

CLOSED

Shares0 from 111,686

Change-111,686 (-100%)

Value$0 (-$437.8K)

Filed 2026-05-14

Acadian Asset Management LLC

CLOSED

Shares0 from 110,882

Change-110,882 (-100%)

Value$0 (-$3.2K)

Filed 2026-05-13

Affinity Asset Advisors, LLC

CLOSED

Shares0 from 100,000

Change-100,000 (-100%)

Value$0 (-$2.9M)

Filed 2026-05-14

BlackRock, Inc.

CLOSED

Shares0 from 69,210

Change-69,210 (-100%)

Value$0 (-$2.0M)

Filed 2026-05-13

Bank of America Corp

CLOSED

Shares0 from 65,749

Change-65,749 (-100%)

Value$0 (-$1.9M)

Filed 2026-05-18

Millennium Management LLC

CLOSED

Shares0 from 63,305

Change-63,305 (-100%)

Value$0 (-$1.8M)

Filed 2026-05-15

Groupe la Francaise

CLOSED

Shares0 from 61,488

Change-61,488 (-100%)

Value$0 (-$1.8M)

Filed 2026-05-21

Rangeley Capital, LLC

CLOSED

Shares0 from 57,098

Change-57,098 (-100%)

Value$0 (-$1.7M)

Filed 2026-05-15

Gabelli Funds LLC

CLOSED

Shares0 from 47,300

Change-47,300 (-100%)

Value$0 (-$1.4M)

Filed 2026-05-14

Geode Capital Management, LLC

CLOSED

Shares0 from 43,920

Change-43,920 (-100%)

Value$0 (-$1.3M)

Filed 2026-05-15

Credit Industriel ET Commercial

CLOSED

Shares0 from 41,392

Change-41,392 (-100%)

Value$0 (-$1.2M)

Filed 2026-04-29

AQR Capital Management LLC

CLOSED

Shares0 from 37,264

Change-37,264 (-100%)

Value$0 (-$1.1M)

Filed 2026-05-15

MacKenzie Financial Corp

CLOSED

Shares0 from 33,834

Change-33,834 (-100%)

Value$0 (-$967.4K)

Filed 2026-05-13

Yakira Capital Management, Inc.

CLOSED

Shares0 from 32,663

Change-32,663 (-100%)

Value$0 (-$944.9K)

Filed 2026-05-14

Alamea Verwaltungs GmbH

CLOSED

Shares0 from 24,165

Change-24,165 (-100%)

Value$0 (-$3.3M)

Filed 2026-05-11

Citadel Advisors LLC

CLOSED

Shares0 from 22,493

Change-22,493 (-100%)

Value$0 (-$650.7K)

Filed 2026-05-15

State Street Corp

CLOSED

Shares0 from 19,543

Change-19,543 (-100%)

Value$0 (-$565.4K)

Filed 2026-05-15

Morgan Stanley

CLOSED

Shares0 from 18,496

Change-18,496 (-100%)

Value$0 (-$535.1K)

Filed 2026-05-15

Deltec Asset Management LLC

CLOSED

Shares0 from 18,000

Change-18,000 (-100%)

Value$0 (-$520.7K)

Filed 2026-04-24

IEQ Capital, LLC

CLOSED

Shares0 from 12,955

Change-12,955 (-100%)

Value$0 (-$374.8K)

Filed 2026-05-15

XTX Topco Ltd

CLOSED

Shares0 from 11,948

Change-11,948 (-100%)

Value$0 (-$345.7K)

Filed 2026-05-15

Point72 Asset Management, L.P.

CLOSED

Shares0 from 10,364

Change-10,364 (-100%)

Value$0 (-$299.8K)

Filed 2026-05-15

Gamco Investors, Inc. ET AL

CLOSED

Shares0 from 10,000

Change-10,000 (-100%)

Value$0 (-$289.3K)

Filed 2026-05-14

Northern Trust Corp

CLOSED

Shares0 from 8,586

Change-8,586 (-100%)

Value$0 (-$248.4K)

Filed 2026-05-14

Omers Administration Corp

CLOSED

Shares0 from 7,900

Change-7,900 (-100%)

Value$0 (-$228.5K)

Filed 2026-05-15

Equitec Proprietary Markets, LLC

CLOSED

Shares0 from 5,593

Change-5,593 (-100%)

Value$0 (-$161.8K)

Filed 2026-05-11

CWM, LLC

CLOSED

Shares0 from 2,286

Change-2,286 (-100%)

Value$0 (-$66)

Filed 2026-05-14

BNP Paribas Financial Markets

CLOSED

Shares0 from 1,090

Change-1,090 (-100%)

Value$0 (-$31.5K)

Filed 2026-05-12

Group One Trading LLC

CLOSED

Shares0 from 1,073

Change-1,073 (-100%)

Value$0 (-$31.0K)

Filed 2026-05-13

Mint Tower Capital Management B.V.

CLOSED

Shares0 from 1,035

Change-1,035 (-100%)

Value$0 (-$30)

Filed 2026-05-04

Tower Research Capital LLC (TRC)

CLOSED

Shares0 from 376

Change-376 (-100%)

Value$0 (-$10.9K)

Filed 2026-05-15

UBS Group AG

CLOSED

Shares0 from 221

Change-221 (-100%)

Value$0 (-$6.4K)

Filed 2026-05-05

Royal Bank of Canada

CLOSED

Shares0 from 168

Change-168 (-100%)

Value$0 (-$5.0K)

Filed 2026-05-15

JPMorgan Chase & Co

CLOSED

Shares0 from 112

Change-112 (-100%)

Value$0 (-$3.2K)

Filed 2026-05-13

Osaic Holdings, Inc.

CLOSED

Shares0 from 103

Change-103 (-100%)

Value$0 (-$3.0K)

Filed 2026-05-15

Lion Point Capital, LP

CLOSED

Shares0 from 100

Change-100 (-100%)

Value$0 (-$2.9K)

Filed 2026-05-15

Flagship Harbor Advisors, LLC

CLOSED

Shares0 from 76

Change-76 (-100%)

Value$0 (-$2.2K)

Filed 2026-04-28

SBI Securities Co., Ltd.

CLOSED

Shares0 from 53

Change-53 (-100%)

Value$0 (-$1.5K)

Filed 2026-04-28

Wells Fargo & Company

CLOSED

Shares0 from 40

Change-40 (-100%)

Value$0 (-$1.2K)

Filed 2026-07-08

Huntington National Bank

CLOSED

Shares0 from 32

Change-32 (-100%)

Value$0 (-$926)

Filed 2026-05-15

SHP Wealth Management

CLOSED

Shares0 from 25

Change-25 (-100%)

Value$0 (-$723)

Filed 2026-05-08

FMR LLC

CLOSED

Shares0 from 8

Change-8 (-100%)

Value$0 (-$231)

Filed 2026-05-15

Danske Bank A/S

CLOSED

Shares0 from 1

Change-1 (-100%)

Value$0 (-$29)

Filed 2026-05-12

Vanguard Group Inc

DECREASED

Shares0 from 210,301

Change-210,301 (-100%)

Value$0 (-$6.1M)

Filed 2026-05-14

	Status
IFP Advisors, Inc	UNCHANGED	3	3	0	0%	$87	$87	$0	2026-04-13
Nextech Invest Ltd.	CLOSED	0	482,689	-482,689	-100%	$14.0M	$0	-$14.0M	2026-05-15
Bain Capital Life Sciences Investors, LLC	CLOSED	0	346,545	-346,545	-100%	$10.0M	$0	-$10.0M	2026-05-15
Rock Springs Capital Management LP	CLOSED	0	152,586	-152,586	-100%	$4.4M	$0	-$4.4M	2026-05-15
Knott David M Jr	CLOSED	0	111,686	-111,686	-100%	$437.8K	$0	-$437.8K	2026-05-14
Acadian Asset Management LLC	CLOSED	0	110,882	-110,882	-100%	$3.2K	$0	-$3.2K	2026-05-13
Affinity Asset Advisors, LLC	CLOSED	0	100,000	-100,000	-100%	$2.9M	$0	-$2.9M	2026-05-14
BlackRock, Inc.	CLOSED	0	69,210	-69,210	-100%	$2.0M	$0	-$2.0M	2026-05-13
Bank of America Corp	CLOSED	0	65,749	-65,749	-100%	$1.9M	$0	-$1.9M	2026-05-18
Millennium Management LLC	CLOSED	0	63,305	-63,305	-100%	$1.8M	$0	-$1.8M	2026-05-15
Groupe la Francaise	CLOSED	0	61,488	-61,488	-100%	$1.8M	$0	-$1.8M	2026-05-21
Rangeley Capital, LLC	CLOSED	0	57,098	-57,098	-100%	$1.7M	$0	-$1.7M	2026-05-15
Gabelli Funds LLC	CLOSED	0	47,300	-47,300	-100%	$1.4M	$0	-$1.4M	2026-05-14
Geode Capital Management, LLC	CLOSED	0	43,920	-43,920	-100%	$1.3M	$0	-$1.3M	2026-05-15
Credit Industriel ET Commercial	CLOSED	0	41,392	-41,392	-100%	$1.2M	$0	-$1.2M	2026-04-29
AQR Capital Management LLC	CLOSED	0	37,264	-37,264	-100%	$1.1M	$0	-$1.1M	2026-05-15
MacKenzie Financial Corp	CLOSED	0	33,834	-33,834	-100%	$967.4K	$0	-$967.4K	2026-05-13
Yakira Capital Management, Inc.	CLOSED	0	32,663	-32,663	-100%	$944.9K	$0	-$944.9K	2026-05-14
Alamea Verwaltungs GmbH	CLOSED	0	24,165	-24,165	-100%	$3.3M	$0	-$3.3M	2026-05-11
Citadel Advisors LLC	CLOSED	0	22,493	-22,493	-100%	$650.7K	$0	-$650.7K	2026-05-15
State Street Corp	CLOSED	0	19,543	-19,543	-100%	$565.4K	$0	-$565.4K	2026-05-15
Morgan Stanley	CLOSED	0	18,496	-18,496	-100%	$535.1K	$0	-$535.1K	2026-05-15
Deltec Asset Management LLC	CLOSED	0	18,000	-18,000	-100%	$520.7K	$0	-$520.7K	2026-04-24
IEQ Capital, LLC	CLOSED	0	12,955	-12,955	-100%	$374.8K	$0	-$374.8K	2026-05-15
XTX Topco Ltd	CLOSED	0	11,948	-11,948	-100%	$345.7K	$0	-$345.7K	2026-05-15
Point72 Asset Management, L.P.	CLOSED	0	10,364	-10,364	-100%	$299.8K	$0	-$299.8K	2026-05-15
Gamco Investors, Inc. ET AL	CLOSED	0	10,000	-10,000	-100%	$289.3K	$0	-$289.3K	2026-05-14
Northern Trust Corp	CLOSED	0	8,586	-8,586	-100%	$248.4K	$0	-$248.4K	2026-05-14
Omers Administration Corp	CLOSED	0	7,900	-7,900	-100%	$228.5K	$0	-$228.5K	2026-05-15
Equitec Proprietary Markets, LLC	CLOSED	0	5,593	-5,593	-100%	$161.8K	$0	-$161.8K	2026-05-11
CWM, LLC	CLOSED	0	2,286	-2,286	-100%	$66	$0	-$66	2026-05-14
BNP Paribas Financial Markets	CLOSED	0	1,090	-1,090	-100%	$31.5K	$0	-$31.5K	2026-05-12
Group One Trading LLC	CLOSED	0	1,073	-1,073	-100%	$31.0K	$0	-$31.0K	2026-05-13
Mint Tower Capital Management B.V.	CLOSED	0	1,035	-1,035	-100%	$30	$0	-$30	2026-05-04
Tower Research Capital LLC (TRC)	CLOSED	0	376	-376	-100%	$10.9K	$0	-$10.9K	2026-05-15
UBS Group AG	CLOSED	0	221	-221	-100%	$6.4K	$0	-$6.4K	2026-05-05
Royal Bank of Canada	CLOSED	0	168	-168	-100%	$5.0K	$0	-$5.0K	2026-05-15
JPMorgan Chase & Co	CLOSED	0	112	-112	-100%	$3.2K	$0	-$3.2K	2026-05-13
Osaic Holdings, Inc.	CLOSED	0	103	-103	-100%	$3.0K	$0	-$3.0K	2026-05-15
Lion Point Capital, LP	CLOSED	0	100	-100	-100%	$2.9K	$0	-$2.9K	2026-05-15
Flagship Harbor Advisors, LLC	CLOSED	0	76	-76	-100%	$2.2K	$0	-$2.2K	2026-04-28
SBI Securities Co., Ltd.	CLOSED	0	53	-53	-100%	$1.5K	$0	-$1.5K	2026-04-28
Wells Fargo & Company	CLOSED	0	40	-40	-100%	$1.2K	$0	-$1.2K	2026-07-08
Huntington National Bank	CLOSED	0	32	-32	-100%	$926	$0	-$926	2026-05-15
SHP Wealth Management	CLOSED	0	25	-25	-100%	$723	$0	-$723	2026-05-08
FMR LLC	CLOSED	0	8	-8	-100%	$231	$0	-$231	2026-05-15
Danske Bank A/S	CLOSED	0	1	-1	-100%	$29	$0	-$29	2026-05-12
Vanguard Group Inc	DECREASED	0	210,301	-210,301	-100%	$6.1M	$0	-$6.1M	2026-05-14

Showing 48 of 48 institutions