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MRSN

Mersana Therapeutics

MRSN

Market cap $145M

Delisted

MRSN was delisted on the 5th of January, 2026.

122 hedge funds and large institutions have $436M invested in Mersana Therapeutics in 2021 Q4 according to their latest regulatory filings, with 30 funds opening new positions, 45 increasing their positions, 24 reducing their positions, and 15 closing their positions.

New

Increased

Maintained

Reduced

Closed

100% more first-time investments, than exits

New positions opened: 30 | Existing positions closed: 15

88% more repeat investments, than reductions

Existing positions increased: 45 | Existing positions reduced: 24

12% more funds holding

Funds holding: 109 → 122 (+13)

0.07% more ownership

Funds ownership: 3.83% → 3.9% (+0.07%)

0% more funds holding in top 10

Funds holding in top 10: 2 → 2 (0)

33% less capital invested

Capital invested by funds: $647M → $436M (-$211M)

91% less call options, than puts

Call options by funds: $92K | Put options by funds: $1.03M

Holders

122

Holders Change

+13

Holders Change %

+11.93%

% of All Funds

1.88%

Holding in Top 10

Holding in Top 10 Change

–

Holding in Top 10 Change %

–

% of All Funds

0.03%

New

Increased

Reduced

Closed

Calls

$92K

Puts

$1.03M

Net Calls

-$938K

Net Calls Change

-$588K

Top Buyers

1	BCLSI Bain Capital Life Sciences Investors Boston, Massachusetts	+$13.2M
2	Point72 Asset Management Stamford, Connecticut	+$6.37M
3	D.E. Shaw & Co New York	+$4.64M
4	Morgan Stanley New York	+$4.36M
5	BNP Paribas Financial Markets Paris, France	+$4.25M

Top Sellers

1	PAMS Pictet Asset Management (Switzerland) Geneva 73, Switzerland	-$21.1M
2	Alkeon Capital Management New York	-$17M
3	BlackRock New York	-$10.3M
4	Wellington Management Group Boston, Massachusetts	-$7.71M
5	T. Rowe Price Associates Baltimore, Maryland	-$6.74M

#	Name	Holding	Trade Value	Shares Change	Change in Stake
1	1 BlackRock New York	$46.5M	-$10.3M	-53,124	-15%
2	ACA 2 Avoro Capital Advisors New York	$42.3M	–	–	–
3	BCLSI 3 Bain Capital Life Sciences Investors Boston, Massachusetts	$33.5M	+$13.2M	+67,600	+46%
4	4 Wellington Management Group Boston, Massachusetts	$31.2M	-$7.71M	-39,612	-16%
5	SCM 5 Sarissa Capital Management Greenwich, Connecticut	$26.7M	–	–	–
6	6 State Street Boston, Massachusetts	$26.3M	+$1.01M	+5,214	+3%
7	BG 7 Bellevue Group Kuesnacht, Switzerland	$25.9M	-$755K	-3,880	-2%
8	8 Vanguard Group Malvern, Pennsylvania	$22.4M	-$577K	-2,967	-2%
9	RSCM 9 Rock Springs Capital Management Baltimore, Maryland	$20.2M	+$1.78M	+9,130	+8%
10	O 10 OrbiMed New York	$18M	–	–	–
11	CS 11 Candriam SCA Strassen, Luxembourg, Luxembourg	$12.6M	–	–	–
12	12 Morgan Stanley New York	$7.64M	+$4.36M	+22,428	+84%
13	13 Goldman Sachs New York	$7.52M	+$500K	+2,569	+6%
14	AG 14 Artal Group Luxembourg	$7.46M	–	–	–
15	15 Geode Capital Management Boston, Massachusetts	$7.07M	+$566K	+2,907	+7%
16	16 Assenagon Asset Management Senningerberg, Luxembourg	$6.68M	+$1.32M	+6,795	+19%
17	17 CIBC Asset Management Toronto, Ontario, Canada	$6.57M	-$21.8K	-112	-0.3%
18	18 Two Sigma Advisers New York	$6.53M	+$3.27M	+16,808	+67%
19	19 Two Sigma Investments New York	$5.46M	+$4.12M	+21,180	+152%
20	20 Point72 Asset Management Stamford, Connecticut	$5.09M	+$6.37M	+32,724	New
21	RCP 21 Rho Capital Partners New York	$4.95M	–	–	–
22	22 Northern Trust Chicago, Illinois	$4.65M	+$396K	+2,034	+7%
23	23 D.E. Shaw & Co New York	$4.01M	+$4.64M	+23,852	+1,227%
24	24 Millennium Management New York	$3.96M	+$4.14M	+21,294	+513%
25	25 BNP Paribas Financial Markets Paris, France	$3.85M	+$4.25M	+21,866	+762%