argenx announced that Karen Massey will join argenx as Chief Operating Officer, effective March 13, 2023. Ms. Massey will succeed Keith Woods, who will remain at argenx for a transition period to support the launch of subcutaneous efgartigimod, after which he will retire and serve as a strategic advisor on the Commercial Committee of the argenx Board of Directors. Ms. Massey has over 20 years' experience in the pharmaceutical and biotechnology industry with an impressive breadth of experience across commercial, product development, corporate strategy & innovation.

She joins argenx from Genentech (Roche Group), where she most recently served as Senior Vice President of Product Development and Global Clinical Operations. In this capacity, she led a global organization of more than 2,000 people across 24 countries and was accountable for operationalizing over 300 clinical trials within oncology, neuroscience, infectious diseases, immunology and ophthalmology. During her 9-year tenure at Genentech, Ms. Massey held various commercial leadership roles across marketing and business operations, including as the Vice President of the Multiple Sclerosis and Neuromyelitis Optica business, leading the team to accelerate the post-launch performance of Ocrevus.

Ms. Massey started her biopharmaceutical career in marketing at Pfizer and returned there, after two years as a management consultant at Bain, to take on leadership positions in corporate strategy, sales and as a commercial lead in Latin America. Ms. Massey holds a Bachelor of Economics from the University of Sydney and a Master of Business Administration from the New York University Stern School of Business.