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Mersana Therapeutics, Inc.

MRSNDelisted Jan 6, 2026
Industry
Pharmaceutical Preparations
SEC CIK
0001442836

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.

13F holders, Q3 2025

Institutional positions in Mersana Therapeutics, Inc. as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
49
−36 vs. Q2 2025
Shares held
3.18M
+87.6K (+2.8%) vs. Q2 2025Converted for a 1-for-25 split
Total value
$24.7M
+$1.77M (+7.7%) vs. Q2 2025
New holders
5
17 more added
Sold out
41
19 more reduced

Compare with Q2 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting MRSN on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ3 2025: 49 institutions
Q1 2021: 132 institutionsQ2 2021: 131 institutionsQ3 2021: 110 institutionsQ4 2021: 122 institutionsQ1 2022: 128 institutionsQ2 2022: 126 institutionsQ3 2022: 152 institutionsQ4 2022: 152 institutionsQ1 2023: 158 institutionsQ2 2023: 147 institutionsQ3 2023: 128 institutionsQ4 2023: 106 institutionsQ1 2024: 125 institutionsQ2 2024: 122 institutionsQ3 2024: 116 institutionsQ4 2024: 132 institutionsQ1 2025: 111 institutionsQ2 2025: 85 institutionsQ3 2025: 49 institutionsQ4 2025: 51 institutionsQ1 2026: 1 institutionQ2 2026: 0 institutions
Value heldQ3 2025: $24.7M
Q1 2021: $1.14BQ2 2021: $957.8MQ3 2021: $648.3MQ4 2021: $436.6MQ1 2022: $322.7MQ2 2022: $408.0MQ3 2022: $623.4MQ4 2022: $592.8MQ1 2023: $437.2MQ2 2023: $370.2MQ3 2023: $144.4MQ4 2023: $263.0MQ1 2024: $526.3MQ2 2024: $229.6MQ3 2024: $219.4MQ4 2024: $149.2MQ1 2025: $30.2MQ2 2025: $22.9MQ3 2025: $24.7MQ4 2025: $64.8MQ1 2026: $87Q2 2026: $0
Institutions holding MRSN and their total value by quarter
QuarterHoldersValue
Q2 20260$0
Q1 20261$87
Q4 202551$64.8M
Q3 202549$24.7M
Q2 202585$22.9M
Q1 2025111$30.2M
Q4 2024132$149.2M
Q3 2024116$219.4M
Q2 2024122$229.6M
Q1 2024125$526.3M
Q4 2023106$263.0M
Q3 2023128$144.4M
Q2 2023147$370.2M
Q1 2023158$437.2M
Q4 2022152$592.8M
Q3 2022152$623.4M
Q2 2022126$408.0M
Q1 2022128$322.7M
Q4 2021122$436.6M
Q3 2021110$648.3M
Q2 2021131$957.8M
Q1 2021132$1.14B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q2 2025.

Institutions holding MRSN in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Danske Bank A/S1$80.00%+1New
North Star Investment Management Corp.6$470.00%00.0%UnchangedConverted for a 1-for-25 split
EverSource Wealth Advisors, LLC14$1090.00%−206−93.6%ReducedConverted for a 1-for-25 split
IFP Advisors, Inc615$2270.00%+588+2,171.0%AddedConverted for a 1-for-25 split
Huntington National Bank32$2480.00%00.0%UnchangedConverted for a 1-for-25 split
SBI Securities Co., Ltd.54$4190.00%−1−1.3%ReducedConverted for a 1-for-25 split
GF Fund Management Co. Ltd.94$7290.00%−10−9.4%ReducedConverted for a 1-for-25 split
Citigroup Inc106$8230.00%−2,814−96.4%ReducedConverted for a 1-for-25 split
Essential Partners LLC116$9000.00%−100−46.3%ReducedConverted for a 1-for-25 split
SRS Capital Advisors, Inc.157$1.22K0.00%+157New
Advisor Group Holdings, Inc.2,603$1.48K0.00%+2,499+2,404.8%AddedConverted for a 1-for-25 split
Mirae Asset Global Investments Co., Ltd.193$1.50K0.00%00.0%UnchangedConverted for a 1-for-25 split
Barclays PLC198$1.54K0.00%−193−49.3%ReducedConverted for a 1-for-25 split
BNP Paribas Arbitrage, SA531$4.12K0.00%+420+380.1%AddedConverted for a 1-for-25 split
Royal Bank of Canada692$5.00K0.00%+686+11,433.3%AddedConverted for a 1-for-25 split
China Universal Asset Management Co., Ltd.875$6.79K0.00%−126−12.6%ReducedConverted for a 1-for-25 split
Group One Trading, L.P.961$7.46K0.00%−433−31.1%ReducedConverted for a 1-for-25 split
Wells Fargo & Company1,240$9.62K0.00%+319+34.7%AddedConverted for a 1-for-25 split
Tower Research Capital LLC (TRC)1,562$12.1K0.00%+295+23.2%AddedConverted for a 1-for-25 split
FMR LLC4,864$37.7K0.00%−677−12.2%ReducedConverted for a 1-for-25 split
CWM, LLC5,756$44.0K0.00%−860−13.0%ReducedConverted for a 1-for-25 split
JPMorgan Chase & Co6,108$47.4K0.00%+904+17.4%AddedConverted for a 1-for-25 split
UBS Group AG8,609$66.8K0.00%−22,411−72.2%ReducedConverted for a 1-for-25 split
Voleon Capital Management LP13,200$102.4K0.00%+13,200New
DRW Securities, LLC13,851$107.5K0.01%+13,851New
Ieq Capital, LLC15,240$118.3K0.00%−10,298−40.3%ReducedConverted for a 1-for-25 split
Lion Point Capital, LP25,760$199.9K1.14%00.0%UnchangedConverted for a 1-for-25 split
State Street Corp29,843$231.6K0.00%+11,759+65.0%AddedConverted for a 1-for-25 split
Two Sigma Investments, LP30,688$238.1K0.00%−2,243−6.8%ReducedConverted for a 1-for-25 split
Two Sigma Advisers, LP40,640$315.4K0.00%+3,160+8.4%AddedConverted for a 1-for-25 split
Geode Capital Management, LLC41,648$323.3K0.00%−320−0.8%ReducedConverted for a 1-for-25 split
AQR Capital Management LLC46,720$362.5K0.00%−158,467−77.2%ReducedConverted for a 1-for-25 split
Mackenzie Financial Corp47,819$371.1K0.00%+47,819New
Morgan Stanley48,327$375.0K0.00%+34,023+237.9%AddedConverted for a 1-for-25 split
Luminus Management LLC50,000$388.0K0.35%+8,427+20.3%AddedConverted for a 1-for-25 split
5AM Venture Management, LLC52,200$405.1K0.15%00.0%UnchangedConverted for a 1-for-25 split
Bank of America Corp66,397$515.2K0.00%+65,594+8,165.3%AddedConverted for a 1-for-25 split
Millennium Management LLC77,989$605.2K0.00%−5,620−6.7%ReducedConverted for a 1-for-25 split
Renaissance Technologies LLC88,465$686.5K0.00%−25,543−22.4%ReducedConverted for a 1-for-25 split
BlackRock, Inc.96,193$746.5K0.00%−54,344−36.1%ReducedConverted for a 1-for-25 split
683 Capital Management, LLC100,000$776.0K0.07%+20,400+25.6%AddedConverted for a 1-for-25 split
Silverarc Capital Management, LLC133,636$1.04M0.15%+8,499+6.8%AddedConverted for a 1-for-25 split
Acadian Asset Management LLC142,360$1.10M0.00%+24,149+20.4%AddedConverted for a 1-for-25 split
Rock Springs Capital Management LP152,586$1.18M0.07%00.0%UnchangedConverted for a 1-for-25 split
Schonfeld Strategic Advisors LLC273,579$2.12M0.01%+46,625+20.5%AddedConverted for a 1-for-25 split
Vanguard Group Inc302,553$2.35M0.00%−4,583−1.5%ReducedConverted for a 1-for-25 split
Bain Capital Life Sciences Investors, LLC346,545$2.69M0.18%00.0%UnchangedConverted for a 1-for-25 split
Alamea Verwaltungs GmbH430,025$3.34M2.28%+405,856+1,679.3%AddedConverted for a 1-for-25 split
Nextech Invest, Ltd.482,689$3.75M0.57%00.0%UnchangedConverted for a 1-for-25 split
Catalio Capital Management, LP0$00.00%−62,697−100.0%Sold outConverted for a 1-for-25 split
Goldman Sachs Group Inc0$00.00%−57,350−100.0%Sold outConverted for a 1-for-25 split
Jacobs Levy Equity Management, Inc0$00.00%−53,318−100.0%Sold outConverted for a 1-for-25 split
Jane Street Group, LLC0$00.00%−20,447−100.0%Sold outConverted for a 1-for-25 split
Gsa Capital Partners LLP0$00.00%−18,867−100.0%Sold outConverted for a 1-for-25 split
Susquehanna International Group, LLP0$00.00%−17,975−100.0%Sold outConverted for a 1-for-25 split
Cerity Partners LLC0$00.00%−12,832−100.0%Sold outConverted for a 1-for-25 split
Deutsche Bank AG0$00.00%−12,203−100.0%Sold outConverted for a 1-for-25 split
Marshall Wace, LLP0$00.00%−9,079−100.0%Sold outConverted for a 1-for-25 split
Northern Trust Corp0$00.00%−8,908−100.0%Sold outConverted for a 1-for-25 split
Qube Research & Technologies Ltd0$00.00%−6,115−100.0%Sold outConverted for a 1-for-25 split
Macquarie Group Ltd0$00.00%−6,000−100.0%Sold outConverted for a 1-for-25 split
Wealth Enhancement Advisory Services, LLC0$00.00%−5,069−100.0%Sold outConverted for a 1-for-25 split
Algert Global LLC0$00.00%−4,053−100.0%Sold outConverted for a 1-for-25 split
Pallas Capital Advisors LLC0$00.00%−3,868−100.0%Sold outConverted for a 1-for-25 split
Jain Global LLC0$00.00%−3,846−100.0%Sold outConverted for a 1-for-25 split
HRT Financial LP0$00.00%−3,735−100.0%Sold outConverted for a 1-for-25 split
Point72 Asia (Singapore) Pte. Ltd.0$00.00%−3,006−100.0%Sold outConverted for a 1-for-25 split
Bank of New York Mellon Corp0$00.00%−2,663−100.0%Sold outConverted for a 1-for-25 split
QVT Financial LP0$00.00%−2,506−100.0%Sold outConverted for a 1-for-25 split
Callan Family Office, LLC0$00.00%−2,262−100.0%Sold outConverted for a 1-for-25 split
R Squared Ltd0$00.00%−1,889−100.0%Sold outConverted for a 1-for-25 split
Captrust Financial Advisors0$00.00%−1,670−100.0%Sold outConverted for a 1-for-25 split
JustInvest LLC0$00.00%−1,468−100.0%Sold outConverted for a 1-for-25 split
Merit Financial Group, LLC0$00.00%−1,264−100.0%Sold outConverted for a 1-for-25 split
Walleye Trading LLC0$00.00%−1,261−100.0%Sold outConverted for a 1-for-25 split
Mariner, LLC0$00.00%−1,249−100.0%Sold outConverted for a 1-for-25 split
Colony Group, LLC0$00.00%−1,239−100.0%Sold outConverted for a 1-for-25 split
HSBC Holdings PLC0$00.00%−1,220−100.0%Sold outConverted for a 1-for-25 split
Jasper Ridge Partners, L.P.0$00.00%−924−100.0%Sold outConverted for a 1-for-25 split
Two Sigma Securities, LLC0$00.00%−703−100.0%Sold outConverted for a 1-for-25 split
Parcion Private Wealth LLC0$00.00%−649−100.0%Sold outConverted for a 1-for-25 split
Prudential Financial Inc0$00.00%−596−100.0%Sold outConverted for a 1-for-25 split
Jump Financial, LLC0$00.00%−453−100.0%Sold outConverted for a 1-for-25 split
ExodusPoint Capital Management, LP0$00.00%−457−100.0%Sold outConverted for a 1-for-25 split
Hunter Perkins Capital Management, LLC0$00.00%−400−100.0%Sold outConverted for a 1-for-25 split
Optiver Holding B.V.0$00.00%−92−100.0%Sold outConverted for a 1-for-25 split
Nisa Investment Advisors, LLC0$00.00%−42−100.0%Sold outConverted for a 1-for-25 split
The PNC Financial Services Group, Inc.0$00.00%−36−100.0%Sold outConverted for a 1-for-25 split
Caitong International Asset Management Co., Ltd0$00.00%−0−100.0%Sold outConverted for a 1-for-25 split
Farther Finance Advisors, LLC0$00.00%−0−100.0%Sold outConverted for a 1-for-25 split