v3.26.1
Cover Page
 12 Months Ended
Dec. 31, 2025
shares
Entity Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38097
Entity Registrant Name ARGENX SE
Entity Incorporation, State or Country Code P7
Entity Address, Address Line One Laarderhoogtweg 25
Entity Address, Postal Zip Code 1101 EB
Entity Address, City or Town Amsterdam
Entity Address, Country NL
Entity Common Stock, Shares Outstanding 61,883,306
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Document Fiscal Year Focus 2025
CIK 0001697862
Amendment Flag false
Document Fiscal Period Focus FY
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One Industriepark Zwijnaarde 7
Entity Address, Address Line Two Building C
Entity Address, Address Line Three Zwijnaarde
Entity Address, Postal Zip Code 9052
Entity Address, City or Town Ghent
Entity Address, Country BE
Contact Personnel Name Tim Van Hauwermeiren
City Area Code +31
Local Phone Number 10 70 38 441
Contact Personnel Email Address TVanHauwermeiren@argenx.com
American depositary shares  
Entity Information [Line Items]  
Title of 12(b) Security American Depositary Shares, each representing one ordinary share with a nominal value of €0.10 per share
Trading Symbol ARGX
Security Exchange Name NASDAQ
Ordinary shares  
Entity Information [Line Items]  
Title of 12(b) Security Ordinary shares with a nominal value of €0.10 per share*
Trading Symbol ARGX
Security Exchange Name NASDAQ