Mersana Therapeutics

MRSN

Market cap $145M

Delisted

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

48 hedge funds and large institutions have $70M invested in Mersana Therapeutics in 2018 Q4 according to their latest regulatory filings, with 9 funds opening new positions, 12 increasing their positions, 15 reducing their positions, and 6 closing their positions.

New

Increased

Maintained

Reduced

Closed

50% more first-time investments, than exits

New positions opened: 9 | Existing positions closed: 6

4% more funds holding

Funds holding: 46 → 48 (+2)

0.46% less ownership

Funds ownership: 3.42% → 2.96% (-0.46%)

20% less repeat investments, than reductions

Existing positions increased: 12 | Existing positions reduced: 15

65% less capital invested

Capital invested by funds: $198M → $70M (-$128M)

67% less funds holding in top 10

Funds holding in top 10: 3 → 1 (-2)

Holders

Holders Change

Holders Change %

+4.35%

% of All Funds

1.07%

Holding in Top 10

Holding in Top 10 Change

-2

Holding in Top 10 Change %

-66.67%

% of All Funds

0.02%

New

Increased

Reduced

Closed

Calls

–

Puts

–

Net Calls

–

Net Calls Change

–

Top Buyers

1	Point72 Asset Management Stamford, Connecticut	+$3.48M
2	JG Jefferies Group New York	+$2.13M
3	ACH ArrowMark Colorado Holdings Denver, Colorado	+$1.18M
4	JP Morgan Chase New York	+$674K
5	HP Hikari Power Tokyo, Japan	+$540K

Top Sellers

1	Wellington Management Group Boston, Massachusetts	-$11.2M
2	EC EcoR1 Capital San Francisco, California	-$4.96M
3	Vanguard Group Malvern, Pennsylvania	-$2.12M
4	Millennium Management New York	-$2.06M
5	BlackRock New York	-$1.54M

#	Name	Holding	Trade Value	Shares Change	Change in Stake
51	51 American Century Companies Kansas City, Missouri	–	-$113K	-451	Closed
52	52 ProShare Advisors Bethesda, Maryland	–	-$110K	-439	Closed
53	53 Royal Bank of Canada Toronto, Ontario, Canada	–	-$2K	-10	Closed
54	54 Daiwa Securities Group Tokyo, Japan	–	-$1K	-5	Closed