• Genmab and argenx have entered a multiyear collaboration bringing together capabilities to jointly discover, develop and commercialize antibody therapies
• Discovery programs against two differentiated targets are underway

Genmab A/S (Nasdaq: GMAB) and argenx (Euronext & Nasdaq: ARGX) announced today that Genmab and argenx have entered into a collaboration agreement to jointly discover, develop and commercialize novel therapeutic antibodies with applications in immunology, as well as in oncology therapeutic areas. The multiyear collaboration will leverage the antibody engineering expertise and knowledge of disease biology of both companies to accelerate the identification and development of novel antibody therapeutic candidates with a goal to address unmet patient needs in immunology and cancer.

“Genmab is entering the therapeutic area of immunology and inflammation as a steppingstone to achieving its vision that by 2030, our knock-your-socks-off “KYSO” antibody medicines will be transforming the lives of people with cancer and other serious diseases,” said Jan van de Winkel, Ph.D., Chief Executive Officer, Genmab. “By partnering with argenx, we will be able to combine our deep knowledge of the biology and therapeutic power of antibodies and have an opportunity to address patients’ needs in oncology as well as in immunology and inflammation.”

“Our core mission is to innovate on behalf of patients by translating immunology breakthroughs into novel pipeline candidates. We do this through a model of co-creation which has led to eight molecules demonstrating human proof-of-concept in our pipeline,” said Tim Van Hauwermeiren, Chief Executive Officer, argenx. “Through our collaboration with Genmab, we are bringing together our combined antibody discovery, development and commercialization expertise to unlock insights on the disease pathways that we will address. This allows us to broaden our capabilities and maximize the opportunity to generate novel therapeutic antibodies within autoimmunity or cancer.”

Collaboration Details

As per the agreement, argenx and Genmab will each have access to the suites of proprietary antibody technologies of both companies to advance the identification of lead antibody candidates against differentiated disease targets. Under the terms of the agreement, argenx and Genmab will jointly discover, develop and commercialize products emerging from the collaboration while equally sharing costs as well as any potential future profits. The collaboration will initially focus on two differentiated targets, including one within immunology and one within cancer, with the potential to expand to more.

About Genmab

Genmab is an international biotechnology company with a core purpose guiding its unstoppable team to strive towards improving the lives of patients through innovative and differentiated antibody therapeutics. For more than 20 years, its passionate, innovative and collaborative team has invented next-generation antibody technology platforms and leveraged translational research and data sciences, which has resulted in a proprietary pipeline including bispecific T-cell engagers, next-generation immune checkpoint modulators, effector function enhanced antibodies and antibody-drug conjugates. To help develop and deliver novel antibody therapies to patients, Genmab has formed 20+ strategic partnerships with biotechnology and pharmaceutical companies. By 2030, Genmab’s vision is to transform the lives of people with cancer and other serious diseases with Knock-Your-Socks-Off (KYSO) antibody medicines.

Established in 1999, Genmab is headquartered in Copenhagen, Denmark with locations in Utrecht, the Netherlands, Princeton, New Jersey, U.S. and Tokyo, Japan. For more information, please visit Genmab.com and follow us on Twitter.com/Genmab.

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-and- only approved neonatal Fc receptor (FcRn) blocker in the U.S., Japan, and the EU. 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.

Genmab Forward-looking Statements

This Media Release contains forward looking statements. The words “believe”, “expect”, “anticipate”, “intend” and “plan” and similar expressions identify forward looking statements. Actual results or performance may differ materially from any future results or performance expressed or implied by such statements. The important factors that could cause our actual results or performance to differ materially include, among others, risks associated with pre-clinical and clinical development of products, uncertainties related to the outcome and conduct of clinical trials including unforeseen safety issues, uncertainties related to product manufacturing, the lack of market acceptance of our products, our inability to manage growth, the competitive environment in relation to our business area and markets, our inability to attract and retain suitably qualified personnel, the unenforceability or lack of protection of our patents and proprietary rights, our relationships with affiliated entities, changes and developments in technology which may render our products or technologies obsolete, and other factors. For a further discussion of these risks, please refer to the risk management sections in Genmab’s most recent financial reports, which are available on www.genmab.com and the risk factors included in Genmab’s most recent Annual Report on Form 20-F and other filings with the U.S. Securities and Exchange Commission (SEC), which are available at www.sec.gov. Genmab does not undertake any obligation to update or revise forward looking statements in this Media Release nor to confirm such statements to reflect subsequent events or circumstances after the date made or in relation to actual results, unless required by law.

Genmab A/S and/or its subsidiaries own the following trademarks: Genmab^®; the Y-shaped Genmab logo^®; Genmab in combination with the Y-shaped Genmab logo^®; HuMax^®; DuoBody^®; DuoBody in combination with the DuoBody logo^®; HexaBody^®; HexaBody in combination with the HexaBody logo^®; DuoHexaBody^® and HexElect^®.

argenx Forward-looking Statements

The contents of this announcement include statements that are, or may be deemed to be, “forward- looking statements.” These forward-looking statements can be identified by the use of forward- looking terminology, including the terms “believes,” “hope,” “estimates,” “anticipates,” “expects,” “intends,” “may,” “will,” or “should” and include statements argenx makes regarding the impact of the transition of the chief operating officer; its launch strategy to make VYVGART available in the EU, China, Canada and select other regions; the VYVGART multi-dimensional expansion strategy; its expansion through potential regulatory approvals and launches and the planned launch of SC efgartigimod, if approved; the timing of data readouts and new clinical efficacy data; the regulatory reviews and regulatory approval timing in the United States, EU and Japan for SC efgartigimod for the treatment of gMG and the long-term safety and tolerability of SC efgartigimod; the therapeutic potential of its product candidates; the intended results of its strategy and its collaboration partners’, advancement of, and anticipated clinical development and regulatory milestones and plans, including the timing of planned clinical trials; and the design of future clinical trials and the timing and outcome of regulatory filings and regulatory approvals. By their nature, forward-looking statements involve risks and uncertainties, and readers are cautioned that any such forward-looking statements are not guarantees of future performance. argenx’s actual results may differ materially from those predicted by the forward-looking statements as a result of various important factors, including the effects of the COVID-19 pandemic, inflation and deflation and the corresponding fluctuations in interest rates; regional instability and conflicts, such as the conflict between Russia and Ukraine, argenx’s expectations regarding the inherent uncertainties associated with competitive developments, preclinical and clinical trial and product development activities and regulatory approval requirements; argenx’s reliance on collaborations with third parties; estimating the commercial potential of argenx’s product candidates; argenx’s ability to obtain and maintain protection of intellectual property for its technologies and drugs; argenx’s limited operating history; and argenx’s ability to obtain additional funding for operations and to complete the development and commercialization of its product candidates. A further list and description of these risks, uncertainties and other risks can be found in argenx’s U.S. Securities and Exchange Commission (SEC) filings and reports, including in argenx’s most recent annual report on Form 20-F filed with the SEC as well as subsequent filings and reports filed by argenx with the SEC. Given these uncertainties, the reader is advised not to place any undue reliance on such forward-looking statements. These forward-looking statements speak only as of the date of publication of this document. argenx undertakes no obligation to publicly update or revise the information in this press release, including any forward-looking statements, except as may be required by law.

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