• argynx has 8 drugs in development
• Partners include Abbvie, LEO Pharma, and Staten Biotech

argenx (Euronext & Nasdaq: ARGX) a clinical-stage biotechnology company developing a deep pipeline of differentiated antibody-based therapies for the treatment of severe autoimmune diseases and cancer, announced today the pricing of an underwritten public offering in the United States and an offering in Europe only to qualified investors (within the meaning of Directive 2003/71/EC, as amended) (the Offering) with anticipated gross proceeds totalling approximately $300.6 million from the sale of 3,475,000 American Depositary Shares (ADSs) at a price to the public of $86.50 per ADS.

Each of the ADSs offered represents the right to receive one ordinary share, nominal value of €0.10 per share. All of the ADSs in the Offering are being sold by argenx.

argenx has granted the underwriters an option to purchase up to an additional 521,250 ADSs, representing 15% of the ADSs sold in the Offering. This option can be exercised during the 30-day period commencing September 18, 2018.

argenx's ADSs are currently listed on the Nasdaq Global Select Market under the symbol "ARGX" and argenx's ordinary shares are currently listed on Euronext Brussels under the symbol "ARGX."

Morgan Stanley, Cowen and Evercore ISI are acting as joint bookrunning managers for the Offering, and Kempen and Nomura are acting as co-managers. Piper Jaffray is acting as a financial advisor in connection with the Offering. The Offering is expected to close on September 21, 2018, subject to customary closing conditions.

argenx creates and develops highly differentiated antibodies for the treatment of cancer and severe autoimmune diseases. The company is currently developing four wholly owned candidates and four candidates with partners. Partners include: Abbvie, LEO Pharma, and Staten Biotech.