13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Biological Products, (No Diagnostic Substances)Defensive growthQuality
ARGX

ARGENX SE

501 institutions still hold ARGENX SE as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 04016X101·Biological Products, (No Diagnostic Substances)·501 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 6.4%
vs prior quarter
13F value held
$14.2B
54.0% inst. owned
of float
Holders
501
-37 QoQ
filers reporting
Activity
+53 / −62
+943 added · −714 reduced
this quarter
Concentration
25.66%
FMR LLC #1
top holder share
AI Holders Summary · Q1 2026

501 institutions reported ARGX in Q1 2026. FMR LLC leads at 25.7% of the visible book. -37 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
FMR LLC
CIK 0000315066
$3.6B5.0M0.19%Q1 202602
JANUS HENDERSON GROUP PLC
CIK 0001274173
$1.8B2.5M0.88%Q1 202603
Capital World Investors
CIK 0001422849
$1.6B2.3M0.22%Q1 202604
Artisan Partners Limited Partnership
CIK 0001466153
$1.1B1.5M1.72%Q1 202605
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$746M1.0M0.14%Q1 202606
Avoro Capital Advisors LLC
CIK 0001633313
$730M1.0M7.18%Q1 202607
BlackRock, Inc.
CIK 0002012383
$590M808K0.01%Q1 202608
RTW INVESTMENTS, LP
CIK 0001493215
$518M709K5.16%Q1 202609
Invesco Ltd.
CIK 0000914208
$434M595K0.07%Q1 202610
MORGAN STANLEY
CIK 0000895421
$409M561K0.02%Q1 202611
Bellevue Group AG
CIK 0001674546
$388M462K7.36%Q4 202512
ALLIANCEBERNSTEIN L.P.
CIK 0001109448
$355M422K0.12%Q1 202613
CITADEL ADVISORS LLC
CIK 0001423053
$338M402K0.05%Q4 202514
BANK OF AMERICA CORP /DE/
CIK 0000070858
$292M400K0.02%Q1 202615
SANDS CAPITAL MANAGEMENT, LLC
CIK 0001020066
$248M340K0.97%Q1 202616
SEI INVESTMENTS CO
CIK 0000350894
$210M287K0.19%Q1 202617
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
CIK 0001644956
$194M266K0.64%Q1 202618
JENNISON ASSOCIATES LLC
CIK 0000053417
$193M230K0.12%Q4 202519
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$175M239K0.02%Q1 202620
FRANKLIN RESOURCES INC
CIK 0000038777
$171M233K0.04%Q1 2026
Page 1 of 26
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