Initiated global VYVGART™ (efgartigimod alfa-fcab) commercial launch
Expect data from five registrational trials of efgartigimod by first quarter of 2023
Announcing four new efgartigimod indications to be initiated in 2022: membranous nephropathy, lupus nephritis, Sjogren’s syndrome, COVID-19 mediated postural orthostatic tachycardia syndrome (POTS)
Anticipate clinical development programs in 12 autoimmune conditions across four therapeutic franchises by end of 2022
Management to present at 40th Annual J.P. Morgan Healthcare Conference

Breda, the Netherlands – argenx (Euronext & Nasdaq: ARGX), a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases, today announced its strategic priorities for 2022 and highlighted recent achievements from its broad
immunology pipeline. Additionally, the Company provided financial guidance for 2022.
“We enter 2022 very excited about the year ahead, having achieved our first FDA approval and initiated our commercial launch of VYVGART in the United States. With these accomplishments, we are well on our way to realizing our goal to become a leading, multi-product immunology company
and believe we have the right team, a differentiated pipeline, and a sustainable innovation engine to support our vision,” commented Tim Van Hauwermeiren, Chief Executive Officer of argenx.
“Beyond this launch, we are focused on expanding and accelerating the clinical development of our efgartigimod portfolio. Toward that end, we expect to report data from five registrational trials by the
end of the first quarter of 2023 and to initiate trials in four new indications this year through
partnership agreements with Zai Lab and IQVIA. We believe our leadership in neonatal Fc receptor (FcRn) blockade, along with our robust immunology pipeline, position 2022 to be a transformational
year for argenx,” continued Mr. Van Hauwermeiren.

Strategic Priorities
The following strategic priorities for 2022 support the ‘argenx 2025’ vision to become a global, integrated immunology organization:
On track for global commercial launch of VYVGART for treatment of generalized myasthenia gravis
(gMG) across three continents
• U.S. commercial launch underway following December 2021 approval by U.S. Food and Drug
Administration (FDA) of VYVGART for the treatment of gMG in adult patients who are antiacetylcholine receptor antibody positive
• Approval by Japan’s Pharmaceuticals and Medical Devices Agency of Marketing Authorization
Application (MAA) expected during first quarter of 2022
• Approval by European Medicines Agency of MAA expected in second half of 2022
• argenx Canada to be established in first quarter of 2022 in preparation for potential Health Canada approval and commercial launch
• Medison to file for approval in Israel in second quarter of 2022
• Zai Lab to file for approval in Greater China by mid-2022
• Additional partnership agreements expected to be announced in 2022 that would expand global patient reach
Topline data expected from five registrational trials of efgartigimod by first quarter of 2023, which position argenx for multiple potential launches within commercial franchises by end of 2024
• Neuromuscular franchise:
o ADAPT-SC: Topline data of subcutaneous (SC) efgartigimod for gMG expected in first quarter of 2022
o ADHERE: Topline data of SC efgartigimod for chronic inflammatory demyelinating
polyneuropathy expected in first quarter of 2023
• Hematology franchise:
o ADVANCE: Topline data of intravenous efgartigimod for primary immune
thrombocytopenia (ITP) expected in second quarter of 2022
o ADVANCE-SC: Topline data of SC efgartigimod for primary ITP expected in first quarter of 2023
• Dermatology franchise:
ADDRESS: Topline data of SC efgartigimod for pemphigus foliaceous and vulgaris
expected in fourth quarter of 2022
Efgartigimod development portfolio to expand to ten high-need autoimmune conditions by end of 2022, solidifying argenx’s leadership position in FcRn blockade
• Trial designs finalized in fifth and sixth potential indications following regulatory consultation
o BALLAD: Registrational trial initiated at end of 2021 of SC efgartigimod for bullous pemphigoid; interim analysis planned of first 30 patients
o ALKIVIA: Registrational trial of SC efgartigimod for idiopathic inflammatory myopathy
(myositis) to initiate in first quarter of 2022; interim analysis planned of first 30 patients of each subtype (immune-mediated necrotizing myopathy, anti-synthetase syndrome and dermatomyositis)
• Through partnership agreement, Zai Lab to launch proof-of-concept trials in two new kidney conditions in 2022: lupus nephritis and membranous nephropathy
o argenx to lead any global registrational program for each potential indication
• argenx entered into strategic partnership with IQVIA to leverage its global clinical development capabilities and accelerate expansion of efgartigimod into additional potential indications
o Proof-of-concept trials to initiate in two autoimmune conditions:
? Primary Sjogren’s syndrome in second half of 2022
? COVID-19-mediated postural orthostatic tachycardia syndrome (POTS) in
mid-2022, which is increasingly reported in patients who continue to have
long-lasting symptoms after complete recovery of COVID-19 infection
ARGX-117, a novel C2 inhibitor, has potential to be second pipeline-in-a-product for multiple autoimmune indications
• Proof-of-concept trial initiated at end of 2021 in multifocal motor neuropathy
• Second proof-of-concept trial to initiate in second half of 2022 for prevention of delayed graft
function and/or allograft failure after kidney transplantation
Continued investment in Immunology Innovation Program to broaden autoimmune pipeline for sustained value creation opportunities
• Phase 1 dose-escalation trial of ARGX-119, an agonist SIMPLE Antibody™ to the musclespecific kinase receptor (MuSK), to start after Clinical Trial Application filing in fourth quarter of 2022
o Trial will evaluate safety, tolerability, pharmacokinetics and pharmacodynamics in healthy volunteers, and also early signal detection in patients
Financial Guidance
As of December 31, 2021, argenx had approximately $2.3 billion in cash, cash equivalents and current
financial assets. Based on current plans to fund anticipated operating expenses and capital expenditures, argenx expects to utilize approximately half of its available cash in 2022. The increased
spend will support the global VYVGART launches, clinical development of efgartigimod and ARGX-117 in 12 total indications, investment in the global supply chain, and continued focus on pipeline
expansion through the Immunology Innovation Program.
40th Annual J.P. Morgan Healthcare Conference Presentation and Webcast
Mr. Van Hauwermeiren will highlight these updates in a corporate presentation at the virtual 40th Annual J.P. Morgan Healthcare Conference on Monday, January 10, 2022 at 7:30 a.m. ET. The live webcast of the presentation may be accessed under Investors on the argenx website. A replay will be
available for 30 days following the presentation.

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-andonly FDA approved neonatal Fc receptor blocker, VYVGART™ (efgartigimod alfa-fcab) for the
treatment of generalized myasthenia gravis (gMG) in adult patients who are anti-acetylcholine receptor (AChR) antibody positive. The Company is evaluating efgartigimod in multiple serious autoimmune diseases and advancing several earlier stage experimental medicines within its therapeutic franchises. For more information, visit www.argenx.com and follow us on LinkedIn, Twitter, and Instagram.