13F Insight
DOSSIER · 13F Holders · Q2 2026Healthcare · Biological Products, (No Diagnostic Substances)
ARGX

ARGENX SE

526 institutions still hold ARGENX SE as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 04016X101·Biological Products, (No Diagnostic Substances)·526 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$21.3B
visible holders
Holders
526
filers reporting
Concentration
22.75%
FMR LLC #1
top holder share
AI Holders Summary · Q2 2026

526 institutions reported ARGX in Q2 2026. FMR LLC leads at 22.7% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
FMR LLC
CIK 0000315066
$4.9B5.2M0.21%Q2 202602
PRICE T ROWE ASSOCIATES INC /MD/
CIK 0000080255
$2.5B3.4M0.28%Q1 202603
Jupiter Topco LLC
CIK 0002146052
$2.3B2.5M0.94%Q2 202604
Capital World Investors
CIK 0001422849
$2.0B2.2M0.24%Q2 202605
JANUS HENDERSON GROUP PLC
CIK 0001274173
$1.8B2.5M0.88%Q1 202606
Artisan Partners Limited Partnership
CIK 0001466153
$1.4B1.5M2.22%Q2 202607
Avoro Capital Advisors LLC
CIK 0001633313
$928M1.0M8.33%Q2 202608
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$863M931K0.15%Q2 202609
BlackRock, Inc.
CIK 0002012383
$721M777K0.01%Q2 202610
RTW INVESTMENTS, LP
CIK 0001493215
$658M709K5.62%Q2 202611
MORGAN STANLEY
CIK 0000895421
$597M643K0.03%Q2 202612
Invesco Ltd.
CIK 0000914208
$412M444K0.03%Q2 202613
BANK OF AMERICA CORP /DE/
CIK 0000070858
$371M400K0.02%Q2 202614
ALLIANCEBERNSTEIN L.P.
CIK 0001109448
$355M422K0.12%Q1 202615
Bellevue Group AG
CIK 0001674546
$279M301K5.88%Q2 202616
SANDS CAPITAL MANAGEMENT, LLC
CIK 0001020066
$277M299K1.03%Q2 202617
CITADEL ADVISORS LLC
CIK 0001423053
$254M273K0.03%Q2 202618
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
CIK 0001644956
$245M265K0.74%Q2 202619
SEI INVESTMENTS CO
CIK 0000350894
$237M255K0.21%Q2 202620
Clearbridge Investments, LLC
CIK 0001348883
$235M254K0.19%Q2 2026
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