Institutional shares held 101 Million
77.2K calls
453K puts
Total value of holdings $38.3M
$29K calls
$172K puts
Market Cap $35M
97,169,296 Shares Out.
Institutional ownership 103.62%
# of Institutions 139


Latest Institutional Activity in MRSN

Top Purchases

Q1 2025
Cerity Partners LLC Shares Held: 244K ($87.9K)
Q1 2025
Wealth Enhancement Advisory Services, LLC Shares Held: 131K ($47.1K)
Q1 2025
Pallas Capital Advisors LLC Shares Held: 94.5K ($34K)
Q1 2025
Merit Financial Group, LLC Shares Held: 41.9K ($15.1K)
Q1 2025
North Crest Asset Manangement, LLC Shares Held: 16.1K ($5.78K)

Top Sells

Q1 2025
Sg Americas Securities, LLC Shares Held: 35.5K ($12.8K)
Q1 2025
Rhumbline Advisers Shares Held: 154K ($55.5K)
Q1 2025
Nisa Investment Advisors, LLC Shares Held: 1.3K ($468)
Q1 2025
China Universal Asset Management Co., Ltd. Shares Held: 24.8K ($8.92K)
Q1 2025
Grimes & Company, Inc. Shares Held: 14.1K ($5.06K)

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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P - Open market or private purchase×
S - Open market or private sale×
V - Transaction voluntarily reported earlier than required×
A - Grant, award, or other acquisition×
D - Sale (or disposition) back to the issuer×
F - Payment of exercise price or tax liability×
I - Discretionary transaction×
M - Exercise of conversion of derivative security×
C - Conversion of derivative security×
E - Expiration of short derivative position×
H - Expiration (or cancellation) of long derivative position with value received×
O - Exercise of out-of-the-money derivative securities×
X - Exercise of in-the-money or at-the-money derivatives securities×
G - Bona fide gift×
L - Small Acquisition×
W - Acquisition or disposition by will or laws×
Z - Deposit into or withdrawal from voting trust×
J - Other acquisition or disposition×
K - Transaction in equity swap or similar instrument×
U - Disposition due to a tender of shares in a change of control transaction×
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