Institutional shares held 101 Million
16.3K calls
13K puts
Total value of holdings $31.3M
$5K calls
$4K puts
Market Cap $30.1M
97,169,296 Shares Out.
Institutional ownership 103.92%
# of Institutions 115


Latest Institutional Activity in MRSN

Top Purchases

Q2 2025
Pallas Capital Advisors LLC Shares Held: 96.7K ($30K)
Q1 2025
Nextech Invest, Ltd. Shares Held: 12.1M ($3.74M)
Q1 2025
Schonfeld Strategic Advisors LLC Shares Held: 7.61M ($2.36M)
Q1 2025
Aqr Capital Management LLC Shares Held: 5.14M ($1.59M)
Q1 2025
Silverarc Capital Management, LLC Shares Held: 3.09M ($957K)

Top Sells

Q2 2025
Wealth Enhancement Advisory Services, LLC Shares Held: 127K ($39.3K)
Q1 2025
Vr Adviser, LLC Shares Held: 3.57M ($1.11M)
Q1 2025
Jpmorgan Chase & CO Shares Held: 50.7K ($15.7K)
Q1 2025
Morgan Stanley Shares Held: 307K ($95.2K)
Q1 2025
Bank Of America Corp Shares Held: 314K ($97.5K)

About MRSN

Mersana Therapeutics, Inc., a clinical stage biopharmaceutical company, develops antibody drug conjugates (ADC) for cancer patients with unmet need. It develops XMT-1592, a Dolasynthen ADC targeting NaPi2b-expressing tumor cells, which is in phase I clinical trial for the treatment of ovarian cancer and NSCLC adenocarcinoma. The company also develops XMT-1660, a B7-H4-targeted Dolasynthen ADC candidate; and XMT-2056, an immunosynthen development candidate. It has a strategic research and development partnerships with Merck KGaA and Asana BioSciences, LLC for the development of ADC product candidates utilizing Fleximer. The company was formerly known as Nanopharma Corp. and changed its name to Mersana Therapeutics, Inc. in November 2005. Mersana Therapeutics, Inc. was incorporated in 2001 and is headquartered in Cambridge, Massachusetts.


Insider Transactions at MRSN

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
618K Shares
From 7 Insiders
Exercise of conversion of derivative security 618K shares
Sell / Disposition
8.24M Shares
From 8 Insiders
Other acquisition or disposition 8.04M shares
Open market or private sale 199K shares

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