argenx

ARGX • NASDAQ

argenx is a publicly traded company on NASDAQ. As of Q3 2025, 427 institutional investors hold shares in this company, with total holdings valued at $19.1B. FMR LLC is the largest holder with a position valued at $4.2B.

Employees1.1K

Websiteargenx.com

Overview

Overview of institutional ownership in ARGX as of Q3 2025

All Institutions

Institutions: 427
Value Held: $19.1B
Shares Held: 25.9M
Avg Position: $44.7M
Median Position: $824.7K

Hedge Funds

Hedge Funds: 50
Value Held: $2.6B
Shares Held: 3.5M
Avg Position: $51.1M
Median Position: $7.5M

Biggest Investors

Institutions with the largest positions in ARGX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
FMR LLC Institution	-	$4.2B 0.22% of portfolio	0.00% 5.7M shares	Q4 2022 Held for 2y 11m	$1.92T
HENDERSON GROUP PLC Institution	Ali Dibadj CEO	$1.9B 0.87% of portfolio	0.00% 2.6M shares	Q4 2022 Held for 2y 11m	$218.74B
Artisan Partners Limited Partnership Long Only Manager	Eric Richard Colson CEO	$1.6B 2.32% of portfolio	0.00% 2.2M shares	Q4 2022 Held for 2y 11m	$69.5B
C Capital World Investors Institution	-	$1.4B 0.20% of portfolio	0.00% 2.0M shares	Q4 2022 Held for 2y 11m	$730.00B
venBio Select Advisor LLC RIA/Wealth	Behzad Aghazadeh Managing Partner	$730.2M 9.45% of portfolio	0.00% 990.0K shares	Q4 2023 Held for 1y 11m	$7.7B
Clearbridge Investments, LLC Long Only Manager	John Randolph Haller COO	$558.2M 0.42% of portfolio	0.00% 756.9K shares	Q4 2022 Held for 2y 11m	$132.87B
WELLINGTON MANAGEMENT CO LLP Long Only Manager	Edmund Wellington Iii President	$538.4M 0.09% of portfolio	0.00% 730.0K shares	Q4 2022 Held for 2y 11m	$571.21B
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	Kenneth Cordele Griffin CEO	$526.3M 0.43% of portfolio	0.00% 713.6K shares	Q4 2022 Held for 2y 11m	$122.08B
RTW INVESTMENTS, LLC Hedge Fund•Sector	Peter M Fong President	$496.7M 6.16% of portfolio	0.00% 673.5K shares	Q4 2022 Held for 2y 11m	$8.1B
B Bellevue Group AG Institution	-	$402.9M 8.39% of portfolio	0.00% 546.3K shares	Q4 2022 Held for 2y 11m	$4.8B

Net Capital Flow

Institutional buying and selling activity for ARGX in Q3 2025

Net Flow: −$394.5M
Buyers: 175
Sellers: 176
Total Bought: +$1.4B
Total Sold: −$1.7B
Avg Position: $45.6M

Biggest Buyers

Institution	Net Bought	Current Position
WELLINGTON MANAGEMENT CO LLP Long Only Manager	+$239.5M +324.7K shares	$538.4M 730.0K shares
FMR LLC Institution	+$198.3M +268.8K shares	$4.2B 5.7M shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	+$184.6M +250.3K shares	$217.0M 294.2K shares
Woodline Partners LP Hedge Fund•Long/Short	+$95.3M +129.2K shares	$125.0M 169.5K shares
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	+$92.7M +125.7K shares	$103.0M 139.7K shares
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	+$55.6M +75.3K shares	$68.2M 92.5K shares
$DEUTSCHE BANK AG\ logo$ DEUTSCHE BANK AG\ Institution	+$50.7M +68.8K shares	$65.4M 88.7K shares
AMERIPRISE FINANCIAL INC Institution	+$40.2M +54.5K shares	$122.2M 165.7K shares
GOLDMAN SACHS GROUP INC Institution	+$37.6M +51.0K shares	$142.4M 193.1K shares
B BNP PARIBAS ARBITRAGE, SA Institution	+$29.4M +39.9K shares	$78.7M 106.7K shares

Biggest Sellers

Institution	Net Sold	Current Position
A ADAGE CAPITAL PARTNERS GP LLC Institution	−$163.8M −297.1K shares	Sold Off 0 shares
venBio Select Advisor LLC RIA/Wealth	−$136.4M −185.0K shares	$730.2M 990.0K shares
Marshall Wace LLP Institution	−$121.8M −165.2K shares	$9.2M 12.5K shares
Artisan Partners Limited Partnership Long Only Manager	−$120.4M −163.3K shares	$1.6B 2.2M shares
Invesco Ltd. ETF Provider	−$117.1M −158.8K shares	$62.6M 84.9K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$112.4M −152.4K shares	$526.3M 713.6K shares
B BRAIDWELL LP Hedge Fund•Multi-Strategy	−$87.3M −118.4K shares	$56.1M 76.1K shares
A Assenagon Asset Management S.A. Institution	−$61.8M −112.1K shares	Sold Off 0 shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$60.7M −82.3K shares	$256.3M 347.5K shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$49.2M −89.3K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited ARGX in Q3 2025

New Positions: 62
New Value: $271.7M
Exited Positions: 56
Exited Value: $443.5M

New Positions

Institution	Position Value
LAZARD ASSET MANAGEMENT LLC Long Only Manager	$101.2M 137.2K shares
N Nuveen, LLC Institution	$60.0M 81.4K shares
N NEW YORK STATE COMMON RETIREMENT FUND Institution	$48.0M 65.1K shares
SANDS CAPITAL MANAGEMENT, LLC Long Only Manager	$12.3M 16.6K shares
MML INVESTORS SERVICES, LLC RIA/Wealth	$11.3M 15.4K shares
ARDSLEY ADVISORY PARTNERS Hedge Fund•Long/Short	$11.1M 15.0K shares
StemPoint Capital LP Hedge Fund•Long/Short	$9.2M 12.5K shares
Beck Bode, LLC RIA/Wealth	$5.3M 7.2K shares
C CAPITAL INTERNATIONAL S A Institution	$1.4M 1.8K shares
REGIONS FINANCIAL CORP Institution	$1.1M 1.5K shares

Exited Positions

Institution	Previous Position
A ADAGE CAPITAL PARTNERS GP LLC Institution	$163.8M 297.1K shares
A Assenagon Asset Management S.A. Institution	$61.8M 112.1K shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$49.2M 89.3K shares
P PUBLIC SECTOR PENSION INVESTMENT BOARD Institution	$45.2M 82.1K shares
R Railway Pension Investments Ltd Institution	$21.8M 39.5K shares
A AXA Institution	$17.2M 31.1K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	$13.5M 24.4K shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$13.1M 23.8K shares
COOKSON PEIRCE & CO INC RIA/Wealth	$12.3M 22.2K shares
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$8.3M 15.0K shares

Options Activity

Institutions with the largest Call and Put options positions in ARGX as of Q3 2025

Call Positions: 19
Call Value: $429.1M
Put Positions: 13
Put Value: $234.2M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$128.1M 1.7K contracts
L LMR Partners LLP Institution	$94.0M 1.3K contracts
Caption Management, LLC Hedge Fund•Long/Short	$70.3M 953.0 contracts
D D. E. Shaw & Co., Inc. Institution	$55.2M 749.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$19.8M 269.0 contracts
J JANE STREET GROUP, LLC Institution	$19.3M 262.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$11.5M 156.0 contracts
P PEAK6 LLC Institution	$7.2M 97.0 contracts
S SIH Partners, LLLP Institution	$6.3M 86.0 contracts
N NOMURA HOLDINGS INC Institution	$5.5M 75.0 contracts

Put Positions

Institution	Position Value
LEUCADIA NATIONAL CORP Institution	$66.7M 904.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$65.9M 894.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$24.0M 325.0 contracts
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	$22.1M 300.0 contracts
J JANE STREET GROUP, LLC Institution	$13.3M 181.0 contracts
S SIH Partners, LLLP Institution	$9.7M 131.0 contracts
P PEAK6 LLC Institution	$9.2M 125.0 contracts
D D. E. Shaw & Co., Inc. Institution	$7.4M 100.0 contracts
N NOMURA HOLDINGS INC Institution	$5.5M 75.0 contracts
AMERIPRISE FINANCIAL INC Institution	$3.0M 40.0 contracts

Most Committed Institutions

Institutions with ARGX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
E Eagle Health Investments LP Hedge Fund•Long/Short	Gary Johnathan Stern Founder	14.99% $57.1M	0.00% 77.4K shares	Q4 2022 Held for 2y 11m	$380.9M
A Artia Global Partners LP Hedge Fund•Long/Short	Onusa Nmn Chantanapongwanij Managing Partner	10.16% $57.8M	0.00% 78.3K shares	Q4 2022 Held for 2y 11m	$568.3M
venBio Select Advisor LLC RIA/Wealth	Behzad Aghazadeh Managing Partner	9.45% $730.2M	0.00% 990.0K shares	Q4 2023 Held for 1y 11m	$7.7B
B Bellevue Group AG Institution	-	8.39% $402.9M	0.00% 546.3K shares	Q4 2022 Held for 2y 11m	$4.8B
T Tri Locum Partners LP Hedge Fund•Long/Short	Prashanth Nmn Jayaram CIO	7.36% $32.0M	0.00% 43.4K shares	Q3 2023 Held for 2y 2m	$435.1M
Rock Springs Capital Management LP Hedge Fund•Sector	Nnamdi C Etoh CFO	6.18% $105.3M	0.00% 142.8K shares	Q1 2025 Held for 8 months	$1.7B
RTW INVESTMENTS, LLC Hedge Fund•Sector	Peter M Fong President	6.16% $496.7M	0.00% 673.5K shares	Q4 2022 Held for 2y 11m	$8.1B
L Longwood Capital Partners LLC Institution	-	4.86% $4.7M	0.00% 6.4K shares	Q4 2022 Held for 2y 11m	$96.8M
D DCF Advisers, LLC Institution	-	4.74% $10.1M	0.00% 13.7K shares	Q1 2025 Held for 8 months	$212.2M
F First Turn Management, LLC Hedge Fund•Long/Short	Lisa Gable Wheatley Managing Partner	4.29% $28.6M	0.00% 38.8K shares	Q4 2023 Held for 1y 11m	$666.0M