13F Insight
DOSSIER · 13F Holders · Q4 2025CyclicalNet sold
MRSN

MERSANA THERAPEU

3 institutions still hold MERSANA THERAPEU as of Q4 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 59045L205·3 13F holders·last filed Dec 31, 2025
Market cap
—
▼ 2.4%
vs prior quarter
13F value held
$15M
48.0% inst. owned
of float
Holders
3
+46 QoQ
filers reporting
Activity
+16 / −74
+985 added · −801 reduced
this quarter
Concentration
95.55%
Nextech Invest, Ltd. #1
top holder share
AI Holders Summary · Q4 2025

3 institutions reported MRSN in Q4 2025. Nextech Invest, Ltd. leads at 95.5% of the visible book. +46 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Nextech Invest, Ltd.
CIK 0001595430
$14M483K1.35%Q4 202502
CITADEL ADVISORS LLC
CIK 0001423053
$650,72222K0.00%Q4 202503
IFP Advisors, Inc
CIK 0001641866
$8730.00%Q1 2026