13F Insight
DOSSIER · 13F Holders · Q1 2026BellwetherCompounder
AKTS

AKTIS ONCOLOGY INC

61 institutions still hold AKTIS ONCOLOGY INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 01021M104·61 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 6.7%
vs prior quarter
13F value held
$508M
74.0% inst. owned
of float
Holders
61
+79 QoQ
filers reporting
Activity
+18 / −98
+1,008 added · −785 reduced
this quarter
Concentration
17.03%
MPM BioImpact LLC #1
top holder share
AI Holders Summary · Q1 2026

61 institutions reported AKTS in Q1 2026. MPM BioImpact LLC leads at 17.0% of the visible book. +79 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
MPM BioImpact LLC
CIK 0001687078
$87M4.8M6.68%Q1 202602
EcoR1 Capital, LLC
CIK 0001587114
$86M4.8M3.66%Q1 202603
Blue Owl Capital Holdings LP
CIK 0001858703
$57M3.2M15.20%Q1 202604
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$41M2.3M0.01%Q1 202605
BlackRock, Inc.
CIK 0002012383
$38M2.1M0.00%Q1 202606
RTW INVESTMENTS, LP
CIK 0001493215
$28M1.6M0.28%Q1 202607
RA CAPITAL MANAGEMENT, L.P.
CIK 0001346824
$27M1.5M0.28%Q1 202608
JANUS HENDERSON GROUP PLC
CIK 0001274173
$26M1.5M0.01%Q1 202609
Octagon Capital Advisors LP
CIK 0001839435
$17M961K1.90%Q1 202610
Avidity Partners Management LP
CIK 0001791827
$17M937K1.83%Q1 202611
Merck & Co., Inc.
CIK 0000310158
$17M953K4.88%Q1 202612
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$15M834K0.00%Q1 202613
EVENTIDE ASSET MANAGEMENT, LLC
CIK 0001442891
$9M507K0.15%Q1 202614
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$9M492K0.00%Q1 202615
STATE STREET CORP
CIK 0000093751
$8M428K0.00%Q1 202616
a16z Capital Management, L.L.C.
CIK 0001540358
$7M415K0.58%Q1 202617
FMR LLC
CIK 0000315066
$7M386K0.00%Q1 202618
UBS Group AG
CIK 0001610520
$6M353K0.00%Q1 202619
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$3M162K0.00%Q1 202620
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 0000938206
$3M150K0.02%Q1 2026
Page 1 of 4
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