argenx to Report First Quarter 2021 Financial Results and Business Update on May 14, 2021

May 7, 2021

Breda, the Netherlands – argenx (Euronext & Nasdaq: ARGX), a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases and cancer, today announced that it will host a conference call and audio webcast on Friday, May 14, 2021 at 2:30 p.m. CET (8:30 a.m. ET) to discuss its first quarter 2021 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 call.

Dial-in numbers:

Please dial in 15 minutes prior to the live call.

Belgium 0800 389 13 France 0805 102 319 Netherlands 0800 949 4506 United Kingdom 0800 279 9489 United States 1 844 808 7140 International 1 412 902 0128

About argenx

argenx is a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases and cancer. 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 is evaluating efgartigimod in multiple serious autoimmune diseases, and cusatuzumab in hematological cancers in collaboration with Janssen. argenx is also advancing several earlier stage experimental medicines within its therapeutic franchises. argenx has offices in Belgium, the United States, Japan and Switzerland. For more information, visithttps://www.argenx.com/ and follow us on LinkedIn athttps://www.linkedin.com/company/argenx/ and Twitter at https://twitter.com/argenxglobal.