April 30, 2026

Amsterdam, the Netherlands – argenx ((Euronext &, NASDAQ:ARGX), a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases, today announced that it will host a conference call and audio webcast on Thursday, May 7, 2026 at 2:30 PM CET (8:30 AM ET) to discuss its first quarter 2026 financial results and provide a business update.

A webcast of the live call may be accessed on the Investors section of the argenx website at argenx.com/investors. A replay of the webcast will be available on the argenx website for approximately one year following the presentation.

Dial-in numbers:

Belgium           32 800 50 201

France                    33 800 943355

Netherlands           31 20 795 1090

United Kingdom 44 800 358 0970

United States           1 888 415 4250

Japan                    81 3 4578 9081

Switzerland           41 43 210 11 32

Use the access code 3810049 to join the call. Please dial in 15 minutes prior to the live call.

About argenx

argenx is a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases. Partnering with leading academic researchers through its Immunology Innovation Program (IIP), argenx aims to translate immunology breakthroughs into a world-class portfolio of novel antibody-based medicines. argenx developed and is commercializing the first approved neonatal Fc receptor (FcRn) blocker and is evaluating its broad potential in multiple serious autoimmune diseases while advancing several earlier stage experimental medicines within its therapeutic franchises. For more information, visit www.argenx.com and follow us on LinkedIn, Instagram, Facebook, and YouTube.

Media:

Ben Petok

bpetok@argenx.com

Investors:

Alexandra Roy

aroy@argenx.com

argenx to Report First Quarter 2026 Financial Results and Business Update on May 7, 2026