MRSN

Mersana Therapeutics, Inc.

Total Trades

105

Buys

9

Sells

48

Largest Trade

N/A

Insiders

10

Institutional Funds

39

Inst. Value

$1M+

Activist Filings

46

Insider Trades

InsiderTitleTypeValueSharesPriceDate
Lowinger Timothy BSVPSELL$15K–$50K14K$1.98Oct 7, 2024
Lowinger Timothy BSVPEXERCISEN/A50KOct 7, 2024
Protopapas AnnaDirectorEXERCISEN/A87KJan 17, 2024
Protopapas AnnaDirectorSELL$50K–$100K29K$2.71Jan 17, 2024
MISRA TUSHARSVPEXERCISEN/A9KJan 17, 2024
MISRA TUSHARSVPSELL$1K–$15K3K$2.71Jan 17, 2024
Mandelia AshishVPSELL$1K–$15K5K$2.71Jan 17, 2024
Mandelia AshishVPEXERCISEN/A13KJan 17, 2024
Lowinger Timothy BSVPSELL$15K–$50K10K$2.71Jan 17, 2024
Lowinger Timothy BSVPEXERCISEN/A29KJan 17, 2024
Carvajal AlejandraSVPSELL$1K–$15K4K$2.71Jan 17, 2024
Carvajal AlejandraSVPEXERCISEN/A11KJan 17, 2024
DeSchuytner BrianSVP, COO & CFOEXERCISEN/A26KJan 17, 2024
DeSchuytner BrianSVP, COO & CFOSELL$15K–$50K9K$2.71Jan 17, 2024
Bala MohanSVPSELL$1K–$15K3K$2.71Jan 17, 2024
Bala MohanSVPEXERCISEN/A9KJan 17, 2024
Bala MohanSVPSELL$1K–$15K2K$1.13Oct 27, 2023
Bala MohanSVPEXERCISEN/A6KOct 27, 2023
MISRA TUSHARSVPSELL$1K–$15K2K$1.18Aug 18, 2023
MISRA TUSHARSVPEXERCISEN/A6KAug 18, 2023
Carvajal AlejandraSVPSELL$15K–$50K4K$3.89Apr 28, 2023
Carvajal AlejandraSVPEXERCISEN/A13KApr 28, 2023
Yang ArvinSVPEXERCISEN/A7KJan 19, 2023
Yang ArvinSVPSELL$1K–$15K2K$5.74Jan 19, 2023
Protopapas AnnaPresident & CEOEXERCISEN/A56KJan 19, 2023
Protopapas AnnaPresident & CEOSELL$50K–$100K17K$5.74Jan 19, 2023
Mandelia AshishVP, ControllerEXERCISEN/A10KJan 19, 2023
Mandelia AshishVP, ControllerSELL$15K–$50K4K$5.74Jan 19, 2023
MISRA TUSHARSVP, CMOSELL$1K–$15K458$5.74Jan 19, 2023
MISRA TUSHARSVP, CMOEXERCISEN/A1KJan 19, 2023
Lowinger Timothy BSVPEXERCISEN/A20KJan 19, 2023
Lowinger Timothy BSVPSELL$15K–$50K6K$5.74Jan 19, 2023
DeSchuytner BrianCFOEXERCISEN/A16KJan 19, 2023
DeSchuytner BrianCFOSELL$15K–$50K5K$5.74Jan 19, 2023
Carvajal AlejandraSVPEXERCISEN/A3KJan 19, 2023
Carvajal AlejandraSVPSELL$1K–$15K782$5.74Jan 19, 2023
Yang ArvinChief Medical Offi…SELL$15K–$50K6K$6.59Dec 2, 2022
Yang ArvinChief Medical Offi…EXERCISEN/A19KDec 2, 2022
MISRA TUSHARChief Manufacturin…SELL$1K–$15K2K$7.10Aug 18, 2022
MISRA TUSHARChief Manufacturin…EXERCISEN/A6KAug 18, 2022
Hack Andrew A. F.DirectorBUY$100K–$500K96K$3.27Jun 2, 2022
Hack Andrew A. F.DirectorBUY$500K+265K$3.22May 26, 2022
Hack Andrew A. F.DirectorBUY$500K+216K$3.46May 23, 2022
Hack Andrew A. F.DirectorBUY$1M+350K$3.25May 18, 2022
Carvajal AlejandraChief Legal OfficerSELL$1K–$15K4K$3.69Apr 28, 2022
Carvajal AlejandraChief Legal OfficerEXERCISEN/A13KApr 28, 2022
Hack Andrew A. F.DirectorBUY$1M+617K$4.05Apr 14, 2022
Hack Andrew A. F.DirectorBUY$1M+598K$4.18Apr 13, 2022
Hack Andrew A. F.DirectorBUY$1M+1.1M$4.42Feb 8, 2022
Lowinger Timothy BChief Science & Te…EXERCISEN/A15KJan 19, 2022
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Institutional Ownership

13F filings as of Dec 31, 2025 · 39 funds holding

Activist & 5%+ Owners

SC 13D/13G filings — investors holding 5%+ of outstanding shares

The Vanguard Group

SC 13G/A · Jan 30, 2026

4.2%

210K shares

Nextech Crossover I GP S.a. r.l.

SC 13G/A · Jan 9, 2026

0.0%

0 shares

0.0%

0 shares

683 Capital Management, LLC

SC 13G · Nov 24, 2025

5.5%

273K shares

Schonfeld Strategic Advisors LLC

SC 13G · Nov 14, 2025

5.5%

274K shares

2.6%

132K shares

Schonfeld Strategic Advisors LLC

SC 13G/A · Aug 14, 2025

4.5%

5.7M shares

BlackRock, Inc.

SC 13G/A · Jul 17, 2025

3.0%

3.8M shares

2.9%

3.6M shares

Schonfeld Strategic Advisors LLC

SC 13G · May 15, 2025

6.1%

7.6M shares

EcoR1 Capital, LLC

SC 13G/A · May 15, 2025

0.0%

0 shares

The Vanguard Group

SC 13G/A · Apr 30, 2025

6.7%

8.4M shares

BlackRock, Inc.

SC 13G/A · Apr 17, 2025

6.7%

8.3M shares

8.3%

10.3M shares

BlackRock, Inc.

SC 13G/A · Feb 5, 2025

8.0%

9.2M shares

Nextech Crossover I GP S.a. r.l.

SC 13G/A · Dec 26, 2024

10.4%

12.1M shares

EcoR1 Capital, LLC

SC 13G/A · Dec 24, 2024

10.0%

11.6M shares

2.7%

3.3M shares

Nextech Crossover I SCSp

SC 13G/A · Nov 14, 2024

9.8%

12.1M shares

Balyasny Asset Management L.P. 2

SC 13G/A · Nov 14, 2024

0.4%

536K shares

SilverArc Capital Management, LLC

SC 13G/A · Oct 15, 2024

1.4%

1.8M shares

Nextech Crossover I SCSp

SC 13G · May 17, 2024

5.1%

6.2M shares

9.4%

11.3M shares

SilverArc Capital Management, LLC

SC 13G · Feb 15, 2024

5.3%

6.4M shares

OrbiMed Capital LLC

SC 13G/A · Feb 14, 2024

0.0%

0 shares

Avoro Capital Advisors LLC

SC 13G/A · Feb 14, 2024

0.0%

0 shares

Balyasny Asset Management L.P. 2

SC 13G · Feb 14, 2024

8.0%

9.7M shares

The Vanguard Group - 23-1945930

SC 13G · Feb 13, 2024

5.2%

6.2M shares

BlackRock, Inc.

SC 13G/A · Jan 29, 2024

6.5%

7.8M shares

8.5%

9.7M shares

EcoR1 Capital, LLC

SC 13G · Jul 27, 2023

16.9%

19.4M shares

OrbiMed Capital LLC

SC 13G · Feb 14, 2023

7.1%

7.1M shares

BB Biotech AG

SC 13G/A · Feb 14, 2023

4.1%

4.1M shares

Avoro Capital Advisors LLC

SC 13G/A · Feb 14, 2023

7.6%

7.5M shares

Rho Ventures V, L.P.

SC 13G/A · Feb 13, 2023

0.0%

0 shares

BlackRock, Inc.

SC 13G/A · Jan 31, 2023

7.5%

7.5M shares

Millennium Management LLC

SC 13G/A · Jan 19, 2023

3.7%

3.7M shares

3.4%

3.3M shares

3.9%

3.3M shares

Millennium Management LLC

SC 13G · Feb 17, 2022

5.2%

3.7M shares

BlackRock, Inc.

SC 13G · Jan 27, 2022

10.4%

7.5M shares

BlackRock, Inc.

SC 13G/A · Jan 26, 2022

10.4%

7.5M shares

4.5%

3.3M shares