ARGENX SE [ARGX] Filings

Table of Contents

​

​

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

​

FORM 20-F

​

(Mark One)

​

OR

​

For the fiscal year ended December 31, 2023

OR

​

For the transition period from                      to                     

OR

​

Date of event requiring this shell company report                     

Commission file number 001-38097

​

​

​

​

​

​

​

Securities registered or to be registered pursuant to Section 12(b) of the Act:

​

​

* Not for trading, but only in connection with the registration of the American Depositary Shares.

Securities registered or to be registered pursuant to Section 12(g) of the Act: None.

​

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None.

​

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report:

​

As of December 31, 2023

59,194,488 ordinary shares were outstanding, including ordinary shares represented by American Depositary Shares.

​

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes X No ◻

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

Yes ◻ No X

​

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes X No ◻

​

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes X No ◻

​

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

​

​

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act. ◻

​

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

​

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. X

​

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

​

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

​

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

​

​

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.

Item 17 ◻ Item 18 ◻

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No X

(APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS.)

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.

Yes ☐ No ◻

​

​

​

​

​

​

Table of Contents

TABLE OF CONTENTS

​

ii

Table of Contents

​

​

​

iii

Table of Contents

Introduction

Unless otherwise indicated, “argenx,” “argenx SE,” “the Company,” “our company,” “we,” “us”, “our” our “Group” refer to argenx SE and its consolidated subsidiaries.

We own various trademark registrations and applications, and unregistered trademarks, including VYVGART^®, VYVGART HYTRULO™, VYVDURA^®, ARGENX™, ABDEG™, NHANCE™, SIMPLE ANTIBODY™, ARGENXMEDHUB™ and our corporate logo. Trade names, trademarks and service marks of other companies appearing in this annual report on Form 20-F (Annual Report) are the property of their respective holders. Solely for convenience, the trademarks and trade names in this Annual Report may be referred to without the ® and ™ symbols, but such references should not be construed as any indicator that their respective owners will not assert, to the fullest extent under applicable law, their rights thereto. We do not intend to use or display other companies’ trademarks and trade names to imply a relationship with, or endorsement or sponsorship, any other companies.

VYVGART^® (efgartigimod alfa) (VYVGART) has been approved in the United States (U.S.), Japan, Europe, the United Kingdom (UK), Israel, mainland China (Mainland China) and Canada for the intravenous (IV) treatment of generalized myasthenia gravis (gMG). We have now commercialized VYVGART in the U.S., several countries in the European Union (EU), Japan, Mainland China (through our partner Zai Lab Ltd (Zai Lab)), Israel (through Medison Pharma Ltd., Medison) and Canada (all such countries together including Iceland, Norway and Liechtenstein, the VYVGART Approved Countries).

VYVGART subcutaneous (SC) (efgartigimod alfa + hyaluronidase qvfc) (VYVGART SC) has been approved in the U.S. as VYVGART HYTRULO™ (VYVGART HYTRULO) and in Japan as VYVDURA^® (VYVDURA) for the treatment of gMG. VYVGART SC has also been approved in the EU and the UK for the treatment of gMG. We have now commercialized VYVGART SC in the U.S. (as VYVGART HYTRULO) and in Germany. Pricing and reimbursement discussions for VYVGART SC remain ongoing in multiple other countries, including in the EU and Japan (as VYVDURA).

For both VYVGART and VYVGART SC, we are aiming for further approvals and we are working to expand commercialization in other jurisdictions.

Where not specified, references in this Annual Report to VYVGART should be read as references to VYVGART and/or VYVGART SC, including VYVGART HYTRULO in relation to the U.S. and VYVDURA in relation to Japan, depending on the context.

Our audited consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (IFRS), as issued by the International Accounting Standards Board (IASB). Accordingly, our consolidated financial statements are presented in this Annual Report in U.S. dollars. All references in this Annual Report to “$,” “US$,” “U.S.$,” “U.S. dollars,” “dollars” and “USD” mean U.S. dollars and all references to “€,” “EUR,” and “euros” mean euros, unless otherwise noted. Throughout this Annual Report, references to ADSs mean American depositary shares (ADSs) or ordinary shares represented by ADSs, as the case may be.

Cautionary Statement with Respect to Forward-Looking Statements

This Annual Report contains certain forward-looking statements. A forward-looking statement is any statement that does not relate to historical facts or events or to facts or events as of the date of this Annual Report or that are derived from our management’s beliefs and assumptions based on information currently available to our management. Forward-looking statements are generally identified by the use of forward-looking words, such as “anticipate”, “aspire”, “believe”, “can”, “continue”, “could”, “estimate”, “expect”, “hope”, “intend”, “is designed to”, “look forward to”, “may”, “might”, “objective”, “plan”, “potential”, “project”, “predict”, “seek”, “should”, “target”, “will”, or other variations or the negative of such terms, or by discussion of strategy, although not all forward-looking statements contain these identifying words. These statements relate to our future results of operations and financial positions, prospects, developments, business strategies, plans and our objectives for future operations, results of clinical trials and regulatory approvals, and are based on analyses or forecasts of future developments and estimates of amounts not yet determinable.

iv

Table of Contents

These forward-looking statements represent the view of management only as of the date of this Annual Report, and we disclaim any obligation to update forward-looking statements, except as may be otherwise required by law. The forward-looking statements in this Annual Report involve known and unknown risks, uncertainties and other factors that could cause our actual future results, performance and achievements to differ materially from those forecasted or suggested herein.

Forward-looking statements include, but are not limited to, statements about:

v

Table of Contents

These include changes in general economic and business conditions. You should refer to Item 3.D. “Risk Factors” of this Annual Report for a discussion of important factors that may cause our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this Annual Report will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame or at all. We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

You should read this Annual Report and the documents that we reference in this Annual Report and have filed as exhibits to the Annual Report completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

Information regarding market and industry statistics contained in this Annual Report is included based on information available to us that we believe is accurate. Forecasts and other forward-looking information obtained from this available information is subject to the same qualifications and the additional uncertainties accompanying any estimates of future market size, revenue and market acceptance of products and services.

In addition, statements that include “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Annual Report, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and you are cautioned not to unduly rely upon these statements.

​

vi

Table of Contents

Summary of Risk Factors

Our ability to implement our business strategy is subject to numerous risks that you should be aware of before making an investment decision. These risks are described more fully below. These risks include, among others:

vii

Table of Contents

​

​

viii

Table of Contents

PART I

ITEM 1.      IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS

Not applicable.

ITEM 2.      OFFER STATISTICS AND EXPECTED TIMETABLE

Not applicable.

ITEM 3.      KEY INFORMATION

A.       [RESERVED]

B.       CAPITALIZATION AND INDEBTEDNESS

Not applicable.

C.       REASONS FOR THE OFFER AND USE OF PROCEEDS

Not applicable.

D.       RISK FACTORS

Our business faces significant risks, including those described below. You should carefully consider all of the information set forth in this Annual Report and in our other filings with the SEC, including the following risk factors which we face and are faced by our industry. Our business, financial condition or results of operations could be materially and adversely affected if any of these risks occurs. These are not the only risks argenx faces. Additional risks and uncertainties not presently known to argenx or that it currently considers immaterial or not specific may also impair its business, results of operation and financial condition. This report also contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially and adversely from those anticipated in these forward-looking statements as a result of certain factors including the risks described below and elsewhere in this Annual Report and our other SEC filings. See “Cautionary Statement with Respect to Forward-Looking Statements.”

Risk Factors Related to argenx’s Financial Position and Need for Additional Capital

We have incurred significant losses since our inception and expect to incur losses for the foreseeable future. We may never achieve or sustain profitability.

Since our inception, we have incurred significant operating losses, totaling $2,405 million of cumulative losses. To date we have commercialized VYVGART for the treatment of gMG. We do not currently have any marketing approvals for any other product candidates or VYVGART in other indications. Our losses resulted principally from costs incurred in research and development, preclinical testing and clinical development of our research programs, and from general and administrative costs associated with commercial roll out and expansion. We intend to continue to conduct research and development, preclinical testing, clinical trials and regulatory compliance activities as well as the continued commercialization of VYVGART and other products candidates, for current and future indications, and we intend to continue our efforts to expand our sales, marketing and distribution infrastructure. These expenses, together with anticipated general and administrative expenses, may result in incurring further losses for the foreseeable future. We anticipate that our operating expenses will increase if and as we execute our strategic objectives and as we experience delays or encounter issues relating thereto, including failed clinical trials, ambiguous clinical trial results, safety issues or other regulatory challenges.

1

Table of Contents

Although we have generated net product sales of $1.2 billion from global product net sales in fiscal year 2023, we can provide no assurances that we will be able to achieve or sustain profitability based on sales in that indication alone or that we will be able to receive regulatory approval of and commercialize VYVGART and VYVGART SC in other indications or in other countries. To become and remain profitable, we must succeed in developing and commercializing products that generate significant revenue. This will require us to be successful in a range of challenging activities, including completing preclinical testing and clinical trials of our products and our product candidates, discovering and developing additional products and product candidates, including new indications, obtaining regulatory approval, establishing manufacturing and marketing capabilities, obtaining funding or reimbursement for our products, and ultimately selling. Those activities are the drivers of our current path to profitability, however, we may not succeed in some or even all of these activities, and even if we do, we may not generate revenue that is significant enough to achieve profitability.

We may need to raise substantial additional funding which may not be available to us on acceptable terms or at all.

We have significant positions of cash and cash equivalents of $2,049 million and current financial assets of $1,131 million as of December 31, 2023. Developing products and product candidates, including new indications, and conducting clinical trials is time-intensive, expensive and risky. Our future capital requirements will depend on many factors, including: (i) the success, cost and timing of our development activities, preclinical testing and clinical trials for our product and product candidates, (ii) the time and costs involved in obtaining regulatory approvals and any delays we may encounter, including as we seek regulatory approval in additional jurisdictions or other indications, (iii) commercialization, manufacturing, sales and marketing of products and product candidates, (iv) securing adequate and uninterrupted supply chains, (v) the costs involved in growing our organization to the size needed to allow for the research, development and potential commercialization of our products or product candidates, (vi) the costs involved in filing patent applications and maintaining and enforcing patents or defending against claims or infringements raised by third parties, (vii) the maintenance of our existing collaboration agreements and entry into new collaboration agreements, and (viii) the amount of revenue, if any, we may derive either directly or in the form of royalty payments from future sales of our products or product candidates, if approved.

To finance our operations, we may need to raise additional capital through a combination of public or private equity or debt financings or other sources, which may include collaborations with third parties. For example, we completed a global offering in July 2023 whereby we raised $1.3 billion in gross proceeds from the sale of 1,917,715 ADSs at a price of $490.00 per ADS and the sale of 663,918 ordinary shares at a price of €436.37 per ordinary share. Our ability to raise additional funds on acceptable terms or at all will depend on financial, economic and market conditions and other factors, over which we may have no or limited control. If we are unable to raise additional capital if and when needed, or if the terms are not acceptable, our business strategy could be impacted, and we may be forced to delay, reduce or terminate the one or more of our research or development programs or the commercialization of any of our products or product candidates, including new indications, or be unable to expand our operations or otherwise capitalize on our business opportunities, all of which may have a material adverse impact on our business, financial condition and results of operations.

Our assets, earnings and cash flows and the investment of our cash and cash equivalents may be subject to risks which may cause losses and affect the liquidity of these investments.

As of December 31, 2023, we had cash and cash equivalents and current financial assets of $3.2 billion compared to $2.2 billion as at December 31, 2022. All of our available cash and cash equivalents and current financial assets are invested in either current accounts, savings accounts, term accounts or highly liquid money market funds. Any future investments may include term deposits, corporate bonds, commercial paper, certificates of deposit, government securities and money market funds in accordance with our cash investment policy. These investments may be subject to general credit, liquidity, market, inflation, foreign currency and interest rate risks and we may realize losses in the fair value of these investments or a complete loss of these investments, which would have a negative effect on our financial condition. The market risks associated with our cash flows and investment portfolio may adversely affect our results of operations, liquidity and financial condition.

2

Table of Contents

Due to the international scope of our operations, our assets, earnings and cash flows are influenced by movements in exchange rates of several currencies, particularly between the U.S. dollar, euro and Japanese Yen. Our revenue from outside of the U.S. will increase as our products, whether commercialized by us or our business partners or our collaborators gain marketing approval in such jurisdictions. If the U.S. dollar weakens against a specific foreign currency, our revenues will increase, having a positive impact on net income, but our overall expenses will increase, having a negative impact. Conversely, if the U.S. dollar strengthens against a specific foreign currency, our revenues will decrease, having a negative impact on net income, but our overall expenses will decrease, having a positive impact. Continued volatility in foreign exchange rates is likely to impact our operating results and financial condition.

Risk Factors Related to Commercialization of argenx’s Products and Product Candidates, Including for New Indications

We will face significant challenges in successfully commercializing our products and additional product candidates after they are launched.

The commercialization of VYVGART in new indications or other approved product candidates, or entrance of any of our products or product candidates into new markets will require us to further expand our sales and marketing organization, enter into collaboration arrangements with third parties, outsource certain functions to third parties, or use some combination of each. We have built, and continue to expand, our sales forces in certain of the VYVGART Approved Countries and plan to further develop our sales and marketing capabilities to promote our products, and product candidates, including new indications, if and when marketing approval has been obtained in other relevant jurisdictions.

Even if we successfully expand our sales and marketing capabilities, either on our own or in collaboration with third parties, we may fail to launch or market our products effectively. Recruiting and training a specialized sales force is expensive and the costs of expanding an independent sales, marketing and/or promotion organization could be greater than we anticipate. We could further encounter difficulties in our sales or marketing, due to regulatory actions, shut-downs, work stoppages or strikes, approval delays, withdrawals, recalls, penalties, supply disruptions, shortages or stock-outs at our facilities or third-party facilities that we rely on, reputational harm, the impact to our facilities due to pandemics or natural or man-made disasters, including as a result of climate change, product liability, and/or unanticipated costs. In addition, recruiting and training a sales force is time-consuming and could delay any product launch. In the event that any such launch is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses, and our investment would be lost if we cannot retain or reposition our sales and marketing personnel.

We have entered into distribution agreements with Medison, Zai Lab, Genpharm Services FZ-LLC (Genpharm) and Handok Inc. (Handok) to perform sales and marketing services in Israel, Central and Eastern Europe, Mainland China, the Gulf Cooperation Council (GCC) and South Korea, respectively. Under these agreements, our product revenues or the profitability of these product revenues could be lower than if we were to market and sell the products that we develop ourselves. Such distribution agreements may place the commercialization of our products outside of our control, including over the amount or timing of resources that our distribution partners devote to our products. Furthermore, our distributors’ willingness or ability to comply with and complete their obligations under our arrangements may be adversely affected by business combinations or significant changes in our distributors’ business strategies. In addition, we may not succeed in entering into arrangements with third parties to sell and market our products or may be unable to do so on terms that are favorable to us.

3

Table of Contents

The commercial success of our products and product candidates, including in new indications or methods of administration, will depend on the degree of market acceptance.

Our products and product candidates, including for new indications or methods of administration, if and when approved and available on the market, may never achieve an adequate level of acceptance by physicians, patients, the medical community, or healthcare payors for us to be profitable. This will depend on a number of factors, many of which are beyond our control, including, but not limited to:

In addition, because we are developing our products and product candidates for the treatment of different indications, negative results in a clinical trial evaluating the efficacy and safety of a product or product candidate for one indication could negatively impact the perception of the efficacy and safety of such product or product candidate in a

4

Table of Contents

different indication, which could have an adverse effect on our reputation, commercialization efforts and financial condition.

Moreover, efforts to educate the medical community and third-party payors on the benefits of our products and product candidates may require significant resources and may never be successful. If our product candidates or methods of use of existing products or new indications fail to gain market acceptance, this will have a material adverse impact on our ability to generate revenues. Even if some products achieve market acceptance, they may not be able to retain market acceptance and/or the market may prove not to be large enough to allow us to generate significant revenues.

We face significant competition for our drug discovery and development efforts.

The market for pharmaceutical products is highly competitive and characterized by rapidly growing understanding of disease biology, quickly changing technologies, strong intellectual property barriers to entry, and a multitude of companies involved in the creation, development, and commercialization of novel therapeutics. Many of these companies are highly sophisticated and often strategically collaborate with each other.

Competition in the autoimmune field is intense and involves multiple monoclonal antibodies (mAbs), other biologics and small molecules either already marketed or in development by many different companies including large pharmaceutical companies such as AbbVie, Inc. (AbbVie) (Humira/rheumatoid arthritis), Amgen, Inc. (Amgen) (Enbrel/rheumatoid arthritis), Biogen Inc, (Tysabr/multiple sclerosis), GlaxoSmithKline plc (GSK) (Benlysta/lupus), F. Hoffman-La Roche AG (Roche) (Rituxan/often used off label) and Janssen Pharmaceuticals, Inc. (Remicade/rheumatoid arthritis and Stelara/psoriasis). In addition, these and other pharmaceutical companies have mAbs or other biologics in clinical development for the treatment of autoimmune diseases.

Currently, our commercial revenue is generated by VYVGART, VYVGART HYTRULO and VYVGART SC in gMG. We face and expect to continue to face intense competition from other biopharmaceutical companies, who have launched or are developing products for the treatment of gMG and other autoimmune diseases, including products that are in the same class as VYVGART, as well as products that are similar to some of our product candidates. Competition for other (potential) future indications is also fierce, with significant development in almost all of the indications we are currently developing or planning to develop for our product or product candidates. For example, we are aware of several neonatal Fc receptor (FcRn) inhibitors that are in clinical development and one FcRn inhibitor, Rystiggo (rozanolixizumab-noli), which was approved in June 2023. We are also aware that AstraZeneca PLC is selling Soliris and Ultomiris for the treatment of adult patients with gMG who are AchR-AB+ and that UCB is selling Rystiggo for the treatment of adult patients with gMG who are AchR-AB+ or MuSK-AB+ and Zilbrysq for the treatment of adult patients with gMG who are AchR-AB+. Roche, Novartis AG, CSL Behring, Grifols, S.A., Curavac, Inc., Takeda Pharmaceutical Co Ltd, RemeGen Co, Immunovant, Inc., Cartesian Therapeutics, Inc., Horizon Therapeutics PLC, Regeneron Pharmaceuticals, Inc./Alnylam Pharmaceuticals, Inc. and Johnson & Johnson Innovation, Inc. (Johnson & Johnson), among others, are developing drugs that may have utility for the treatment of myasthenia gravis (MG).

Competitive product launches may erode future sales of our products, including our existing products and those currently under development, or result in unanticipated product obsolescence. Such launches continue to occur, and potentially competitive products are in various stages of development. We could also face competition for use of limited international infusion sites, particularly in new markets as competitors launch new products. We cannot predict with accuracy the timing or impact of the introduction of competitive products that treat diseases and conditions like those treated by our products or product candidates. In addition, our competitors and potential competitors compete with us in recruiting and retaining qualified scientific, clinical research and development and management personnel, establishing clinical trial sites, registering patients for clinical trials, as well as in acquiring technologies complementary to, or necessary for, the development of our products.

There can be no assurance that our competitors are not currently developing, or will not in the future develop, technologies and products that are equally or more effective, are more economically attractive, and can be administered more easily than any of our current or future technologies or products.

5

Table of Contents

Competing products or technology platforms may gain faster or greater market acceptance than our products or technology platforms and medical advances or rapid technological development by competitors may result in our products and product candidates or technology platforms becoming non-competitive or obsolete before we are able to recover our research and development and commercialization expenses. If we, our products and product candidates or our technology platforms do not compete effectively, it is likely to have a material adverse effect on our business, financial condition and results of operation.

Our products and product candidates for which we have obtained or intend to seek approval as biological products, including for new indications, may face biosimilar competition.

In the U.S., the Biologics Price Competition and Innovation Act (BPCIA) created an abbreviated approval pathway for biological products that are biosimilar to or interchangeable with a U.S. Food and Drug Administration (FDA)-licensed reference biological product. Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference product was first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date on which the reference product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the reference product if the FDA approves a full biologics license application (BLA) for the competing product containing the sponsor’s own preclinical data and data from adequate and well-controlled clinical trials to demonstrate the safety, purity and potency of their product.

We believe that any of our product candidates approved as a biological product under a BLA should qualify for the 12-year period of exclusivity, as was the case with VYVGART and VYVGART HYTRULO. The regulatory exclusivity periods for VVVGART and VYVGART HYTRULO is expected to extend until December 2033 in the U.S. Regulatory protection in the EU (both orphan and data/marketing exclusivity) is expected to expire in August 2032 in the European Economic Area (EEA) and March 2033 in the UK. Following those periods of regulatory exclusivity, we must enforce our patent rights against biosimilar products that infringe the patent claims of these products. However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, or that the FDA will not consider our product candidates to be reference products for competing products, potentially creating the opportunity for competition by biosimilar products sooner than anticipated. Moreover, an interchangeable biosimilar product, once approved, may be substituted under existing state law for any one of our reference products in a way that is similar to traditional generic substitution for non-biological products. Any non-interchangeable biosimilar products may also be substituted by a healthcare provider but, under existing law, will not be automatically substituted at the pharmacy. The extent of the impact of such substitution will depend on a number of marketplace and regulatory factors that are still developing.

In the EU, biosimilars are evaluated for marketing authorization pursuant to a set of general and product class-specific guidelines. In April 2023, the European Commission adopted a proposal to revise the EU’s pharmaceutical legislation. If adopted in the form proposed, a number of changes to the regulatory framework governing medicinal products in the EEA would occur, including a shortened period of data and market exclusivity. In addition, in an effort to spur biosimilar utilization and/or increase potential healthcare savings, some EU Member States have adopted, or are considering the adoption of, biosimilar uptake measures such as physician prescribing quotas or automatic pharmacy substitution of biosimilars for the corresponding reference products. Some EU Member States impose automatic price reductions upon market entry of one or more biosimilar competitors. In September 2022, the European Medicines Authority (EMA) and the EU Heads of Medicines’ Agencies issued a joint statement providing that biosimilar medicines approved in the EU are “interchangeable” with their reference products and other biosimilars of the same reference product. This statement could further contribute to the prescribing of biosimilars and to greater competition in Europe. While the degree of competitive effects of biosimilar competition differs among EU Member States and among products, the overall use of biosimilars and the rate at which product sales of innovative products are being affected by biosimilar competition is increasing.

6

Table of Contents

Enacted and future legislation could impact demand for our products which could impact our business and future results of operations.

In the U.S., the UK, the EU and other jurisdictions, there have been a number of legislative and regulatory changes to the healthcare systems that could affect our future results of operations. Governmental regulations that mandate price controls or limitations on patient access to our products or establish prices paid by government entities or programs for our products could impact our business, and our future results of operations could be adversely affected by changes in such regulations or policies. For example, if the European Commission’s recent proposal to revise the EU’s pharmaceutical legislation is adopted in the form proposed, we may be affected by a decrease in data and market exclusivity for our products and product candidates in the EEA.

In particular, there have been and continue to be a number of initiatives at the U.S. federal and state levels that seek to reduce healthcare costs in general and the cost of pharmaceuticals in particular. Healthcare reform initiatives in the U.S. culminated in the enactment of the Inflation Reduction Act (IRA) in August 2022, which allows, among other things, the U.S. Department of Health and Human Services (HHS) to directly negotiate the selling price of a statutorily specified number of drugs and biologics each year that the Centers for Medicare & Medicaid Services (CMS) reimburses under Medicare Part B and Part D. Only high-expenditure single-source biologics that have been approved for at least 11 years (7 years for single-source drugs) can qualify for negotiation, with the negotiated price taking effect two years after the selection year. In August 2023, the U.S. government announced the first 10 drugs to be subject to negotiation, although the Medicare drug price negotiation program is currently subject to legal challenges. Negotiations for Medicare Part D products begin in 2024 with the negotiated price taking effect in 2026, and negotiations for Medicare Part B products begin in 2024 with the negotiated price taking effect in 2028. HHS will announce the negotiated maximum fair price by September 1, 2024, and this price cap, which cannot exceed a statutory ceiling price, will come into effect on January 1, 2026.

The IRA also penalizes drug manufacturers that increase prices of Medicare Part D and Part B drugs at a rate greater than the rate of inflation. The IRA will also cap out-of-pocket spending for Medicare Part D enrollees and make other Part D benefit design changes beginning in 2024. Beginning in 2025, the IRA eliminates the coverage gap under Medicare Part D by significantly lowering the enrollee maximum out-of-pocket cost to $2,000 and by requiring manufacturers to subsidize, through a newly established manufacturer discount program, 10% of Part D enrollees’ prescription costs for brand drugs below the out-of-pocket maximum, and 20% once the out-of-pocket maximum has been reached (plans will also be required to cover 20% in this case). Although these discounts represent a lower percentage of enrollees’ costs than the current discounts required below the out-of-pocket maximum (that is, in the coverage gap phase of Part D coverage), the new manufacturer contribution required above the out-of-pocket maximum could be considerable for very high-cost patients and the total contributions by manufacturers to a Part D enrollee’s drug expenses may exceed those currently provided. These Part D design changes may also incentivize Part D plans to exclude certain drugs from their formularies, which could affect the supply, demand, and pricing of our product and product candidates.

The IRA permits the Secretary of HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. HHS has and will continue to issue and update guidance as these programs are implemented. Manufacturers that fail to comply with the IRA may be subject to various penalties, some significant, including civil monetary penalties. The IRA also extends enhanced subsidies for individuals purchasing health insurance coverage in ACA (as defined below) marketplaces through plan year 2025. These provisions began taking effect progressively starting in 2023, although they may be subject to legal challenges. For example, the provisions related to the negotiation of selling prices of high-expenditure single-source drugs and biologics have been challenged in multiple lawsuits, Thus, while the full economic impact of IRA is unknown at this time, the law’s passage is likely to affect the pricing of our products and product candidates. In addition, in response to the Biden administration’s October 2022 executive order, on February 14, 2023, HHS released a report outlining three new models for testing by the Center for Medicare and Medicaid Innovation, which will be evaluated on their ability to lower the cost of drugs, promote accessibility, and improve quality of care. It is unclear whether the models will be utilized in any health reform measures in the future. The adoption of restrictive price controls in new jurisdictions, more restrictive controls in existing jurisdictions, the adoption of these lower prices by commercial payors, or the failure to obtain or maintain timely or adequate pricing could also adversely impact revenue. We expect pricing pressures will continue globally.

7

Table of Contents

Further, at the U.S. state level, legislatures are increasingly enacting laws and implementing regulations designed to control pharmaceutical and biological product pricing, including price or reimbursement constraints, discount requirements, marketing cost disclosure and price transparency reporting, and programs designed to encourage importation from other countries and bulk purchasing. States are also enacting laws modeled on federal policies, such as the IRA and the 340B drug discount program. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, including pharmaceuticals, which could result in reduced demand for our products and product candidates or additional pricing pressures.

The EU, on the other hand, has reopened the entire legislative framework for medicinal products. On April 26, 2023, the European Commission has published its proposal for a new directive (COM/2023/192 final) and a new regulation (COM/2023/193 final), which would revise and replace the existing general pharmaceutical legislation, including e.g., Directive 2001/83/EC, as well as Regulations (EC) No. 726/2004, No. 141/2000, or No. 1901/2006 (EU Pharmaceutical Legislation). This proposal is currently undergoing the ordinary legislative procedure in the European Parliament and Council of the European Union and is therefore still subject to changes. If at all, the EU Pharmaceutical Legislation is expected to be implemented at the earliest in the next few years. Prevention and mitigation of medicine shortages, simplification of the market entry of generics and biosimilars, the reduction of the regulatory burden (e.g., by increased digitalization) and the implementation of a new regime for data and / or market exclusivity (e.g., by reducing the minimum period while introducing factors that, if met, prolong protections for marketing authorization holders) are among the major objectives pursued by the European Commission. Pending the outcome of the legislative procedure, the impact could be positive with respect to certain regulatory processes. There could, however, also be a negative impact on innovative pharma and biotech companies such as argenx due to shorter baseline regulatory and orphan exclusivities if the proposal is not amended.

We are subject to government pricing laws, regulation and enforcement. These laws affect the prices we may charge the government for our products and the reimbursement our customers may obtain from the government. Our failure to comply with these laws could harm our results, operations and/or financial conditions.

In the U.S., we are required to participate in various government programs for our products to be reimbursed or purchased by the federal government. We participate in programs such as the Medicaid Drug Rebate Program, the 340B drug discount program, Medicare Part B, Medicare Part D and the U.S. Department of Veterans Affairs Federal Supply Schedule pricing program. The requirements vary by program, but among these and any other programs in which we participate, we are, among other things, required to enter into agreements with and calculate and report prices and other information to certain government agencies, charge no more than statutorily mandated ceiling prices and calculate and pay rebates and refunds for certain products.

The calculations are complex and are often subject to interpretation by us, governmental agencies and the courts. If we determine that the prices we reported were in error, we may be required to restate those prices and pay additional rebates or refunds to the extent we understated the rebate or overcharged the government due to the error. Additionally, there are penalties associated with submission of incorrect pricing or other data. We may incur significant civil monetary penalties if we are found to have knowingly submitted false prices or other information to the government, or to have charged 340B covered entities more than the statutorily mandated ceiling price. Certain failures to timely submit required data also could result in a civil monetary penalty for each day the information is late. We could also become subject to allegations under the False Claims Act and other laws and regulations. In addition, misreporting and failure to timely report data to CMS also can be grounds for CMS to terminate our Medicaid rebate agreement, pursuant to which we participate in the Medicaid Drug Rebate Program. In the event that CMS terminates our rebate agreement, no federal payments would be available under Medicaid or Medicare Part B for our covered outpatient drugs.

Recently enacted legislation in the U.S. has imposed additional rebates under government programs. For example, effective January 1, 2024, under the American Rescue Plan of 2021, rebates that manufacturers pay to state Medicaid programs was eliminated. Elimination of this cap may require pharmaceutical manufacturers to pay more in Medicaid rebates than they receive on the sale of products for products that have undergone substantial price increases. In addition, the Infrastructure Investment and Jobs Act, effective January 1, 2023, added a requirement for manufacturers of certain single-source drugs (including biologics and biosimilars) separately paid for under Medicare

8

Table of Contents

Part B for at least 18 months and marketed in single-dose containers or packages (known as refundable single-dose containers or single-use package drugs) to provide annual refunds for any portions of the dispensed drug that are unused and discarded if those unused or discarded portions exceed an applicable percentage defined by statute or regulation. Manufacturers are subject to periodic audits and those that fail to pay refunds for their refundable single-dose containers or single-use package drugs shall be subject to civil monetary penalties. This requirement applies to VYVGART, and potentially other of our products in the future. As a result, we owe refunds to CMS starting this year. Although we will evaluate options to reduce the amount of refunds owed, pursuing any such actions will be time-consuming and costly. Even if we invest resources to reduce the amount of refunds owed to CMS, it is possible that we will be delayed or unsuccessful in achieving a reduction worthy of our investment.

Maintaining compliance with these government price reporting and discounting obligations is time-consuming and costly, and a failure to comply can result in substantial fines, penalties, all of which could adversely impact our financial results.

We may not obtain or maintain adequate coverage or reimbursement status for our products and product candidates.

Sales of VYVGART for gMG, VYVGART HYTRULO and our product candidates, if approved, will depend, in part, on the extent to which third-party payors, including government health programs in the U.S. (such as Medicare Parts B and D and Medicaid) and other countries, commercial health insurers, and managed care organizations, provide coverage and establish adequate reimbursement levels for such products and product candidates. In the U.S., no uniform policy of coverage and reimbursement for products exists among commercial third-party payors. Commercial third-party payors decide which products they will pay for and establish reimbursement levels. Commercial payors often rely upon Medicare coverage policy and payment limitations in setting their own coverage and reimbursement policies. However, decisions regarding the extent of coverage and amount of reimbursement to be provided for any product candidate that we develop through approval will be made on a plan-by-plan basis. One commercial payor’s determination to provide coverage for a product does not assure that other commercial payors will also provide coverage and adequate reimbursement for the product. Additionally, a commercial third-party payor’s decision to provide coverage for a drug does not imply that an adequate reimbursement rate will be approved. Each plan determines whether or not it will provide coverage for a product, what amount it will pay the manufacturer for the product, on what tier of its formulary the product will be placed and whether to require step therapy. The position of a product on a formulary generally determines the co-payment that a patient will need to make to obtain the product and can strongly influence the adoption of a product by patients and physicians.

Even under U.S. government healthcare programs such as Medicare and Medicaid, coverage and reimbursement policies can vary significantly. Medicare Part D is administered by commercial insurance companies under contract with the CMS. The many Part D plans operated by these companies vary considerably in their coverage and reimbursement policies, much like the commercial plans that these same companies offer, as described above. Medicare Part B and Medicaid coverage and reimbursement rates are more uniform, but even Medicaid programs vary from state to state in their coverage policies and reimbursement rates.

Patients who are prescribed treatments for their conditions and providers prescribing such services generally rely on third-party payors to reimburse all or part of the associated healthcare costs. Patients are unlikely to use our products unless coverage is provided and reimbursement is adequate to cover a significant portion of the cost of our products. Further, from time to time, typically on an annual basis, payment rates are updated and revised by third-party payors. Such updates could impact the demand for our products, to the extent that patients who are prescribed our products, if approved, are not separately reimbursed for the cost of the product.

The process for determining whether a third-party payor will provide coverage for a product may be separate from the process for setting the price of a product or for establishing the reimbursement rate that such a payor will pay for the product. Even if we do obtain adequate levels of reimbursement, third-party payors, such as government or private healthcare insurers, carefully review and increasingly question the coverage of, and challenge the prices charged for, products. Increasingly, third-party payors are requiring that biopharmaceutical companies provide them with predetermined discounts from list prices and are challenging the prices charged for products. We may also be required to conduct expensive pharmacoeconomic studies to justify the coverage and the amount of reimbursement for particular

9

Table of Contents

medications. We cannot be sure that coverage and reimbursement will be available for any product that we commercialize and, if reimbursement is available, what the level of reimbursement will be.

Moreover, coverage policies and third-party payor reimbursement rates may change at any time. Therefore, even if favorable coverage and reimbursement status is attained for one or more products for which we receive marketing approval in one or more indications, less favorable coverage policies and reimbursement rates may be implemented in the future. For instance, even though favorable coverage and reimbursement status has been attained for VYVGART for the treatment of gMG in the U.S., access to VYVGART or for any other indication may be reduced or restricted by limited payer coverage due to treatment criteria, which may prevent us from realizing its full commercial potential. In addition, the coverage and reimbursement levels for our products for the treatment in one indication may have an adverse impact on the coverage and reimbursement levels of such products or product candidates in other indications for which marketing approval has previously been or may subsequently be obtained. Inadequate coverage or reimbursement may diminish or prevent altogether any significant demand for our products and/or may prevent us entirely from entering certain markets or indications, which would prevent us from generating significant revenues or becoming profitable, which would adversely affect our business, financials and results of operations.

In many foreign countries, pricing, coverage, and level of reimbursement of prescription drugs are subject to governmental control, and we and our collaborators may be unable to obtain coverage, pricing, and/or reimbursement on terms that are favorable to us or necessary for us or our collaborators to successfully commercialize our marketed products in those countries. In some foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements governing drug pricing and reimbursement vary widely from country to country, and may take into account the clinical effectiveness, cost, and service impact of existing, new, and emerging drugs and treatments. For example, the EU provides options for its member states to restrict the range of medicinal products for which their national health insurance systems provide reimbursement and to control the prices of medicinal products for human use. A member state may approve a specific price for the medicinal product or it may instead adopt a system of direct or indirect controls on the profitability of the company placing the medicinal product on the market. Our results of operations may suffer if we or our collaborators are unable to market our products in foreign countries or if coverage and reimbursement for our marketed products in foreign countries is limited or delayed.

If we fail to obtain orphan drug designation or we do not have valid and enforceable patents covering our products and product candidates and fail to obtain and/or maintain orphan drug exclusivity for our products or product candidates, our competitors may be able to sell products to treat the same conditions and our revenue may be reduced.

Under the Orphan Drug Act, the FDA may designate a product as an orphan drug if it is intended to treat a rare disease or condition, defined as a patient population of fewer than 200,000 in the U.S., or a patient population greater than 200,000 in the U.S. where there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the U.S. In the EU, after a recommendation from the EMA’s Committee for Orphan Medicinal Products, the EU Commission grants orphan drug designation to promote the development of products that are intended for the diagnosis, prevention or treatment of a life-threatening or chronically debilitating condition either affecting not more than five in 10,000 persons in the EU or when, without incentives, it is unlikely that sales of the drug in the EU would be sufficient to justify the necessary investment in developing the drug or biological product. In each case there must be no satisfactory method of diagnosis, prevention or treatment of such condition, or, if such a method exists, the medicine must be of significant benefit to those affected by the condition.

In the U.S., orphan drug designation entitles a party to financial incentives such as tax advantages and user fee waivers. In addition, if a product receives the first FDA approval for the indication for which it has orphan designation, the product is entitled to orphan drug exclusivity, which means the FDA may not approve any other application submitted by another applicant to market a same or similar biological product for the same indication for a period of seven years, except in limited circumstances. Whether a biological product is the same as another product is based on whether the two products have the same principal molecular structural features. Orphan designation does not, however, truncate the duration of the regulatory review and approval process.

In the EU, orphan drug designation entitles a party to financial incentives such as reduction of fees or fee waivers and 10 years of market exclusivity following drug or biological product approval. This period may be reduced to

10

Table of Contents

six years if the orphan drug designation criteria are no longer met, including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity. If we fail to obtain or if we lose orphan drug status for one or more of our products and product candidates, the aforementioned incentives and market exclusivity may not or no longer be available to us, which is likely to increase the overall cost of development and to decrease the competitive position of such product and product candidate including from biosimilars. Similar considerations apply in the UK.

We may from time to time seek orphan drug designation in the U.S. or the EU for certain indications addressed by our products and product candidates. For example, in September 2017, the FDA granted orphan drug designation for the use of efgartigimod for gMG, and upon approval of VYVGART, the FDA granted seven years of orphan drug exclusivity for VYVGART for the treatment of gMG in adult patients who are anti-acetylcholine receptor (AChR) antibody positive (AChR-AB+). In July 2022, the FDA granted orphan drug designation for VYVGART HYTRULO, and upon approval of VYVGART HYTRULO, the FDA granted seven years of orphan drug exclusivity for this product for the treatment of gMG in adult patients who are AChR-AB+. In January 2019, the FDA granted orphan drug designation for the use of efgartigimod for the treatment of primary immune thrombocytopenia (ITP) and for the use of cusatuzumab for the treatment of acute myeloid leukemia (AML), and in August 2021, the FDA granted orphan drug designation for the use of efgartigimod co-formulated with recombinant human hyaluronidase PH20 (rHuPH20) for the treatment of chronic inflammatory demyelinating polyneuropathy (CIDP). In June 2020, Japan’s Ministry of Health, Labour and Welfare (MHLW) granted orphan drug designation for the use of efgartigimod for the treatment of gMG and in January 2022, the MHLW granted approval of VYVGART for treatment of gMG. Furthermore, in December 2022, the MHLW granted orphan drug designation for the use of VYVGART for the treatment of ITP. The application for approval of VYVGART for treatment of ITP was filed for the first time, pioneering worldwide, but such approval is expected in the first quarter of 2024. With regard to these designations or future designations we may obtain, we may not be the first to obtain marketing approval of these drugs for such indication due to the uncertainties associated with developing therapeutic products, and we may not obtain orphan designation upon approval. In addition, exclusive marketing rights in the U.S. may be limited if we seek approval for an indication broader than the orphan-designated indication or may be lost if the FDA later determines that the request for designation was materially defective or if we are unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition. Further, even if we obtain orphan drug exclusivity for a product, that exclusivity may not effectively protect the product from competition because different drugs with different active moieties or different principal molecular structural features can be approved for the same condition. Even after an orphan drug is approved, the FDA, EMA or other foreign regulator can subsequently approve the same drug with the same principal molecular structural features for the same condition if the regulator concludes that the later drug is safer, more effective, or makes a major contribution to patient care.

Risk Factors Related to Other Government Regulations

We are subject to healthcare laws, regulation and enforcement. The failure to comply with these laws could harm our results, operations and/or financial conditions.

Our current and future operations may be or may become directly, or indirectly through our customers and third-party payors, subject to various U.S. federal and state, EU, Japanese, Chinese, UK, Canadian, Israel and other jurisdictions’ healthcare laws including anti-kickback statutes, anti-bribery, anti-corruption provisions, anti-fraud statutes, false claims acts, including the U.S. federal Anti-Kickback Statute (AKS), the U.S. Federal Food, Drug, and Cosmetic Act (FDCA), False Claims Act and more. Healthcare providers, physicians and others play a primary role in the recommendation and prescription of any products for which we obtain marketing approval. These laws may impact, among other things, our proposed sales, marketing and education programs and constrain our business and financial arrangements with third-party payors, healthcare professionals who participate in our clinical research programs, healthcare professionals and others who recommend, purchase, or provide our approved products, and other parties through which we market, sell and distribute our products for which we obtain marketing approval.

In addition, our current and future operations are subject to other healthcare-related statutory and regulatory requirements and enforcement by regulatory authorities in jurisdictions in which we conduct our business. For example, the provision of benefits or advantages to physicians to induce or encourage the prescription, recommendation,

11

Table of Contents

endorsement, purchase, supply, order or use of medical products is generally not permitted in countries that form part of the EU, or the UK. Some EU Member States have enacted laws explicitly prohibiting the provision of these types of benefits and advantages to induce or reward improper performance generally, and the UK has enacted similar restrictions through the Bribery Act 2010. Infringements of these laws can result in substantial fines and imprisonment, as well as associated reputational harm. We are also subject to EU Directive 2001/83/EC and the Human Medicines Regulations 2012. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business.

The shifting compliance environment and the need to maintain robust and expandable systems to comply with multiple jurisdictions with different compliance or reporting requirements increases the possibility that we or our collaborative partners may run afoul of one or more of the requirements. We continue to expand, enhance and refine our internal ethics and compliance function and program to ensure compliance with the different healthcare laws and regulations. The expansion and maintenance of an internal compliance program involves substantial costs and, notwithstanding our investment, mechanisms put in place to ensure compliance with applicable laws and regulations and our best efforts, the program may not be fully successful as there can be no assurance that our policies and procedures will be followed at all times or will effectively detect and/or prevent all compliance violations by our employees, consultants, subcontractors, agents and partners.

It is possible that governmental authorities will conclude that our business practices do not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative investigations, penalties, damages, fines, disgorgement, imprisonment, exclusion of drugs from government funded healthcare programs, such as Medicare and Medicaid in the U.S., additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, reputational harm and the curtailment or restructuring of our operations. Managing such investigations and defending against or appealing any such actions or penalties can be costly and time-consuming and may require significant financial and personnel resources. Therefore, even if we are successful in managing any such governmental investigations and/or defending against or appealing any such actions or penalties that may be brought against or imposed upon us, our business may be impaired. Further, if any of the physicians or other healthcare providers or entities with whom we expect to do business is found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs. Efforts to ensure that our business arrangements with third parties comply with applicable healthcare laws and regulations also involves substantial costs.

The scope and enforcement of each of these laws is uncertain and subject to rapid change in the current environment of healthcare reform. Federal and state enforcement bodies have recently increased their scrutiny of interactions between healthcare companies and healthcare providers, which has led to a number of investigations, prosecutions, convictions and settlements in the healthcare industry. Ensuring business arrangements comply with applicable healthcare laws, as well as responding to possible investigations by government authorities, can be time and resource consuming and can divert a company’s attention from the business.

All aspects of our business ranging from preclinical, clinical trials, marketing and commercialization are highly regulated and any delay by relevant regulatory authorities could jeopardize our development and approval process or result in other suspensions, refusals or withdrawal of approvals.

Before we can commence clinical trials for a product candidate, we must complete extensive preclinical testing and clinical trials that support our investigational new drug (IND) or planned IND applications in the U.S. or Japan, or our clinical trial applications (CTAs) in the UK or in the EU, or a comparable application in other jurisdictions. We cannot be sure that we will be able to submit INDs or CTAs or comparable applications for our preclinical programs on the timelines we expect, if at all. We also cannot guarantee that submission of INDs or CTAs or comparable applications will result in the UK Medicines and Healthcare products Regulatory Agency (MHRA), the EMA, the FDA, the MHLW (collectively, the Relevant Regulatory Authorities) or other regulatory authorities allowing clinical trials to even begin.

12

Table of Contents

Clinical trials must be conducted in accordance with Relevant Regulatory Authorities and other applicable regulatory authorities’ legal requirements and regulations and are subject to oversight by these governmental agencies and institutional review boards (IRBs) and ethics committees at the medical institutions where the clinical trials are conducted. In addition, clinical trials must be conducted in compliance with good clinical practices (GCPs) and with supplies of our products and product candidates produced under current good manufacturing practices (cGMPs) and other regulations. We could encounter delays if a clinical trial is suspended or terminated, by us, by the IRBs or ethics committees of the institutions in which such clinical trials are being conducted, by the data review committee or data safety monitoring board for such clinical trial by the Relevant Regulatory Authorities or other comparable regulatory authorities. Such authorities may impose a suspension or termination due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or clinical trial site by the Relevant Regulatory Authorities or other applicable authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, including those relating to the class to which our products and product candidates belong, failure to demonstrate a benefit from using the product or product candidate, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial.

If we experience delays in the completion of, or termination of, any clinical trial of our products or product candidates, the costs of our clinical trials may increase, the commercial prospects of our products and product candidates may be harmed, and our ability to generate product revenues from any of these products and product candidates will be delayed. Significant clinical trial delays could also allow our competitors to bring products to market before we do or shorten any periods during which we have the exclusive right to commercialize our products and product candidates.

Moreover, we must obtain separate regulatory approvals in each jurisdiction where we want to market and approval by one regulatory authority does not ensure approval by any other regulatory authority. As approval procedures can vary among countries and may change over time, this can require additional clinical testing and the time required to obtain approval may differ. We can provide no assurances that such approval will be obtained on the timeline that we expect or at all. In addition, we anticipate to submit applications for approval of VYVGART in new indications, but can provide no assurances that such applications will be accepted or that we will receive approval on our anticipated timeline, or at all.

If VYVGART or any new formulations of VYVGART are not approved in one or more jurisdictions including beyond the VYVGART Approved Countries, or if such approvals are significantly delayed, it could have a material adverse effect on our business. It is possible that none of our other existing product candidates or any product candidates we may seek to develop in the future will ever obtain regulatory approval in any other jurisdiction or indication.

Further, the Relevant Regulatory Authorities may impose extensive and ongoing unique regulatory requirements. For example, they:

13

Table of Contents

The costs of compliance with all Relevant Regulatory Authorities and applicable authorities regulations, requirements or guidelines could be substantial, and failure to comply could result in sanctions, including fines, injunctions, civil penalties, denial of applications for marketing authorization of our products, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of products, operating restrictions and criminal prosecutions, any of which could significantly increase our and/or our collaborative partners’ costs or delay the development and commercialization of our product candidates. At this time, we cannot guarantee or know the exact nature, precise timing and detailed costs of the efforts that will be necessary to complete the remainder of the development of our research programs and product candidates.

We are subject to privacy laws, regulation and potential enforcement. Our failure to comply with these laws could harm our results, operations and/or financial conditions.

Privacy laws, regulation and potential enforcement are particularly relevant to our business as we collect, store and process patient data, including sensitive health data as well as human biological samples such as blood or tissue, in the context of our clinical development activities, post-marketing approval monitoring obligations, and associated activities. We also collaborate on a regular basis with third parties where we may seek to use data collected by third parties on our or their behalf, or we may seek to share data collected by us with such third parties to further our research or commercial initiatives.

The EU General Data Protection Regulation (GDPR) imposes a broad range of strict requirements on companies, including with respect to cross-border transfers of personal data. The GDPR allows the imposition of substantial penalties in the event of non-compliance, including fines of up to €10 million or up to 2% of total worldwide annual turnover of the preceding fiscal year for certain comparatively minor offenses, or up to €20 million or up to 4% of total worldwide annual turnover if the preceding fiscal year for more serious offenses. We face uncertainty as to the exact interpretation of the requirements under the GDPR, and we may be unsuccessful in implementing all measures required by data protection authorities or courts in interpretation of the GDPR.

In addition, national laws of EU Member States may partially deviate from the GDPR and impose different obligations from country to country, so that we do not operate in a uniform legal landscape in the EU. Also, in the field of handling genetic data, the GDPR specifically allows EU Member States’ laws to impose additional and more specific requirements or restrictions, and European national laws have historically differed quite substantially in this field, leading to additional uncertainty.

Following its departure from the EU, the UK has maintained in force substantially equivalent provisions to the GDPR (UK GDPR). The UK Government has recently announced reforms to the regime. Similar concerns as those described above apply to our compliance with the UK GDPR and other UK data protection rules.

Privacy laws continue to evolve and expand in Europe. For example, Directive 2002/58/EC of the European Parliament and of the Council of July 12, 2002 (as amended, the e-Privacy Directive) required the EU Member States to implement laws to meet strict privacy requirements related to electronic communications, cookies and online monitoring, and other digital privacy. Violations of these requirements can result in administrative measures, including fines, or criminal sanctions. The EU is in the process of developing a new e-Privacy Regulation to replace the e-Privacy Directive, and the new e-Privacy Regulation may impose additional obligations and risk for our business.

Beyond the EU and UK, privacy and data protection laws and regulations continue to develop and expand around the world, including in other jurisdictions in which we operate, such as the U.S., Japan, and Canada. Such laws and regulations impose increasing restrictions and obligations on the processing of personal data, including sensitive personal data such as genetic data. For example, in the U.S., the federal Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology for Economic and Clinical Health Act, imposes specific requirements relating to the privacy, security, and transmission of individually identifiable health information and new state privacy laws, such as the California Consumer Privacy Act of 2018 (CCPA) and the Washington My Health My Data Act of 2023, impose obligations on covered businesses, including, but not limited to, providing specific disclosures in privacy notices and affording residents certain rights related to their personal data. Additionally, effective as of

14

Table of Contents

January 1, 2023, the California Privacy Rights Act of 2020 (CPRA) imposes additional obligations on companies covered by the legislation and will significantly modify the CCPA, including by expanding consumers’ rights with respect to certain sensitive personal information. The CPRA also creates a new state agency that will be vested with authority to implement and enforce the CCPA and the CPRA. Furthermore, in the U.S., similar laws were enacted in certain states and proposed in numerous others. The effects of the CCPA and the CPRA are potentially significant and may require us to modify our data collection or processing practices and policies and to incur substantial costs and expenses in an effort to comply and increase our potential exposure to regulatory enforcement and/or litigation. If we are investigated by a data protection authority, we may face fines and other penalties. Any such investigation or charges by such data protection authorities could have a negative effect on our existing business and on our ability to attract and retain new clients or pharmaceutical partners. We may also experience hesitancy, reluctance, or refusal by clients or pharmaceutical partners to continue to use our products and solutions due to the potential risk exposure as a result of the current (and, in particular, future) data protection obligations imposed on them by certain data protection authorities in interpretation of current law. Such clients or pharmaceutical partners may also view any alternative approaches to compliance as being too costly, too burdensome, too legally uncertain, or otherwise objectionable and therefore decide not to do business with us. Any of the foregoing could harm our business, prospects, financial condition and results of operations.

Failure to comply with anti-corruption laws and regulations, anti-money laundering laws and regulations, economic sanctions and/or export control regulations and other laws governing our operations such as in relation to sustainability could have an adverse impact on our business.

We are or may become subject to various laws and regulations regarding anti-corruption, anti-money laundering, economic sanctions, investment restrictions, anti-fraud and export control regulations issued by multiple jurisdictions. These include the UK Bribery Act 2010 and the U.S. Foreign Corrupt Practices Act of 1977, as amended, which prohibits, among other things, payments, offers, or promises made for the purpose of improperly influencing any act or decision of a foreign official. The nature of our business means that we engage in significant interactions with foreign officials. We are also subject to economic sanctions and export control rules and regulations imposed by, amongst others, the U.S. Department of the Treasury’s Office of Foreign Assets Control, other agencies of the U.S. government, HM Treasury and other agencies of the UK government, the EU, and the United Nations. Any change in export or import regulations, economic sanctions regulations or related legislation, shift in the enforcement or scope of existing regulations, or change in the countries, governments, persons or technologies targeted by such regulations, could decrease our ability to manufacture, import, export or sell our products internationally. Any limitation on our ability to manufacture, import, export or sell our products could adversely affect our business.

We have mechanisms in place to ensure compliance with such rules and regulations. However, there can be no assurance that our policies and procedures will be followed at all times or will effectively detect and/or prevent violations of applicable compliance regimes by our employees, consultants, sub-contractors, agents and partners. As a result, in the event of non-compliance, we could be subject to substantial civil or criminal penalties, including economic sanctions against us, incarceration for responsible employees and managers, the possible loss of export or import privileges, reputational harm, and resulting loss of revenue and profits, which could have a material adverse impact on our business, financial conditions and operations.

Moreover, a growing number of investors, regulators, self-regulatory organizations and other stakeholders have expressed an interest in setting Environmental, Social and Governance (ESG) goals and requiring the provision of new and more robust disclosure of steps taken to implement such goals. The related legislative landscape in the EU has been evolving accordingly. For example, on January 5, 2023, Directive (EU) 2022/2464 of the European Parliament and of the Council of December 14, 2022 amending Regulation (EU) No 537/2014, Directive 2004/109/EC, Directive 2006/43/EC and Directive 2013/34/EU, as regards corporate sustainability reporting (CSRD) came into force. This new directive strengthens the rules on the social and environmental information that companies must report. It expands the scope of companies required to report ESG information and increases the depth of required disclosures. The CSRD also introduces a ‘double materiality’ analysis, which requires companies to report on how sustainability issues might create financial risks for the company and on the company’s own impacts on people and the environment. The CSRD applies to large EU companies, EU parent companies of a “large group” and listed EU small or medium-sized companies. It also applies to non-EU companies that meet certain criteria, including an EU turnover threshold and an EU branch or

15

Table of Contents

subsidiary. The specific information to be reported is set out in the European Sustainability Reporting Standards (ESRS). Companies subject to the CSRD will have to comply with the reporting requirements on a staggered basis depending on their category. For listed companies that qualify as large EU companies and which are already obliged to publish a non-financial statement, a mandatory sustainability report in accordance with the ESRS will be required for financial years starting on or after January 1, 2024. This means that in 2025, we will have to publish for the first time a sustainability report complying with requirements under the CSRD integrated in our annual report for the financial year 2024. The Dutch government is in the process of implementing the CSRD into Dutch legislation.

This means that in 2025, we will have to publish our first CSRD report covering the prescribed ESG information for the financial year 2024. The Dutch government is in the process of implementing the CSRD into Dutch legislation. In July 2023, a Dutch draft bill to implement certain elements of the CSRD (including the requirements for assurance of CSRD reports and applicability to listed companies) was published and submitted for public consultation, which consultation period ended in September 2023. Additionally, in November 2023, a Dutch draft decree implementing certain elements of the CSRD (including the CSRD disclosure obligations for in-scope companies, assurance rules and implementation timelines) was published and submitted for public consultation, which consultation period ended in December 2023. The Dutch government will need to progress the parliamentary debate and adoption of the aforementioned draft bill and decree in the near future given that the ultimate date for implementation of the CSRD within EU member states at a local level is July 6, 2024.

Similarly, the SEC adopted on March 6, 2024 final rules aimed at enhancing and standardizing climate-related disclosures relating to climate-related risks, Scope 1 and Scope 2 greenhouse gas emissions and climate-related financial metrics (SEC Climate Rules). As a foreign private issuer and large accelerated filer, we will need to begin complying with the disclosure requirements of the SEC Climate Rules in our Form 20-F for the fiscal year ending December 31, 2025, which will include quantitative and qualitative climate-related disclosures.

In response to new ESG initiatives and regulations we may voluntarily elect, or be required, to adopt strategies, policies, or procedures related to ESG matters. Reporting on ESG goals and objectives, including pursuant to the SEC Climate Rules, may cause us to expend significant capital and human resources, and could divert management’s attention from central operational matters. Reports could also lead to the disclosure of information that which may have a negative impact on our operations and reputation which may lead to additional exposure. Failure to accurately comply with any ESG reporting obligations may result in enforcement actions, sanctions, reputational harm or private litigation.

We may become exposed to liability and substantial expenses in connection with environmental compliance or remediation activities.

Our operations, including our research, development, testing and third-party manufacturing activities, are subject to numerous environmental, health and safety laws and regulations and for which we may become liable.

If we or one of our CMOs or third-party distributors, manufacturers, licensees or co-marketers fail to comply with such laws and regulations, such failure could result in substantial fines, penalties or other sanctions which could also bring significant reputational loss to our business.

We face a risk of environmental liability inherent in our current and historical activities, including liability relating to releases of our exposure to hazardous or biological materials. Furthermore, environmental, health and safety laws and regulations are becoming more stringent. Both us and our CMOs may be required to incur substantial expenses in connection with future environmental compliance or remediation activities, in which case, our production and development efforts may be interrupted or delayed, and our financial condition and results of operations may be materially adversely affected

16

Table of Contents

Risk Factors Related to the Development and Clinical Testing of argenx’s Products and Product Candidates

Failure to successfully identify, select and develop VYVGART in other indications, or additional products or product candidates could impair our ability to grow.

Our long-term growth strategy entails developing and marketing additional products and product candidates, including VYVGART in new indications, which requires substantial resources, whether or not any product candidates or new indications are ultimately identified. The success of this strategy depends partly upon our ability to identify, select, develop, and ultimately, commercialize promising product candidates. We are heavily dependent on precise, accurate and reliable scientific data to identify, select and develop promising product candidates and products. Our business decisions may therefore be adversely influenced by inaccurate, improper or fraudulent scientific data, including data sourced from third parties. Any irregularities in the scientific data used by us to determine our focus in research and development of product and product candidates, could impair our ability to grow. Even with accurate scientific data, our technology platforms may fail to discover and to generate additional products and products candidates, that are suitable for further development.

Even if we identify additional product candidates, they may not be suitable for clinical development as a result of harmful side effects, limited efficacy or other characteristics that indicate that it is unlikely to be a product that will receive approval by the Relevant Regulatory Authorities and other comparable regulatory authorities or achieve market acceptance. For example, in November 2023, we announced that our ADVANCE-SC clinical trial evaluating VYVGART HYTRULO in adults with ITP did not meet the primary endpoint of a sustained platelet count response in chronic ITP patients. Secondary endpoints were also not met. In December 2023, we announced that topline data from the Phase 3 ADDRESS clinical trial evaluating SC efgartigimod in adults with pemphigus vulgaris (PV) and pemphigus foliaceus (PF) showed that the proportion of PV patients achieving the primary endpoint of complete remission on complete remission on minimal dose of steroids (CRmin) was not significantly different between SC efgartigimod and placebo. We consequently decided not to pursue additional development in pemphigus and plan to prioritize clinical development of efgartigimod in its ongoing severe autoimmune indications. If we do not successfully identify, develop and commercialize product candidates and VYVGART in new indications based upon our technological approach, we may not be able to obtain product or collaboration revenues in future periods.

VYVGART has obtained regulatory approval in the VYVGART Approved Countries for the treatment of gMG. Our other products and product candidates – including additional indications or methods of use for efgartigimod, empasiprubart and ARGX-119 – are either in preclinical or clinical development or are pending marketing approval.

To obtain the requisite regulatory approvals to market and sell any of our products and product candidates, we or our collaborators for such candidates must successfully demonstrate that our products are safe and effective in humans. Clinical trials are expensive and can take many years to complete, and their outcome is inherently uncertain. Further, success in early clinical trials or in one indication does not guarantee success in later clinical trials or in other indications.

The time required to obtain approval by the Relevant Regulatory Authorities is unpredictable but typically takes many years, if obtained at all, following the commencement of clinical trials and depends upon numerous factors, including the substantial discretion or interpretation of the regulatory authorities. This lengthy approval process as well as the unpredictability of future clinical trial results may result in our failing to obtain regulatory approval to market any of our product candidates, including for new indications. We may experience delays in our ongoing or planned clinical trials, for a large variety of reasons outside our control in complying with regulatory approvals which can adversely affect the timing of trials, including as described in Item 3.D. “Risk Factors—Risk Factors Related to Other Government Regulations—All aspects of our business ranging from preclinical, clinical trials, marketing and commercialization are highly regulated and any delay by relevant regulatory authorities could jeopardize our development and approval process or result in other suspensions, refusals or withdrawal of approvals.”

If we are unable to obtain regulatory approval of our products and product candidates on a timely basis or at all, our business may be impacted.

17

Table of Contents

Our clinical trials have, and may in the future, fail, and even if they succeed, we may not obtain regulatory approval for our products and product candidates or regulatory approval may be delayed.

Even if clinical trials are initiated, our development efforts may not be successful. Many of our clinical trials are blinded, which may cause us to incur significant expenses without any visibility as to the likelihood of successful results. Even if we obtain positive results from preclinical trials or initial clinical trials, we may not achieve the same success in future clinical trials.

Regulatory approval of our products or product candidates may be delayed or refused for many reasons, including:

Any of these occurrences may harm our business, results of operations and financial condition significantly.

We could also experience operational challenges as we undertake an increasing number of clinical trials, including those conducted in countries outside the EU, UK and the U.S. that may subject us to further delays and expenses as a result of increased shipment costs, additional regulatory requirements and the engagement of non-EU, non-UK and non-U.S. contract research organizations (CROs), as well as expose us to risks associated with clinical investigators who are unknown to the Relevant Regulatory Authorities, and apply different standards of diagnosis, screening and medical care.

If we experience delays in the completion of, or termination of, any clinical trial of our products or product candidates, our commercial prospects may be harmed. Any delays in completing our clinical trials may increase our costs, slow down our product candidate development and approval process and jeopardize our ability to commence product sales and generate revenues. Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product candidates or result in the development of our product candidates being stopped early. Significant clinical trial delays could also allow our competitors to bring products to market before we do or shorten any periods during which we have the exclusive right to commercialize our products and product candidates.

18

Table of Contents

If we decide to pursue accelerated approval for any of our product candidates, it may not lead to a faster development or regulatory review or approval process and does not increase the likelihood that our product candidates will receive marketing approval. If we are unable to obtain approval under an accelerated pathway, we may be required to conduct additional clinical trials beyond those that we contemplate, which could increase the expense of obtaining, reduce the likelihood of obtaining, and/or delay the timing of obtaining, necessary marketing approvals.

In the future, we may decide to pursue accelerated approval for one or more of our product candidates. For example, under the FDA’s accelerated approval program, the FDA may approve a drug or biological product for a serious or life-threatening disease or condition that provides a meaningful advantage over available therapies based upon a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit. For products granted accelerated approval, post-marketing confirmatory clinical trials are required to verify and describe the anticipated effect on irreversible morbidity or mortality or other clinical benefit. These confirmatory clinical trials must be completed with due diligence, and the FDA may require that the clinical trial be designed, initiated, and/or fully enrolled prior to approval. If we were to pursue accelerated approval for a product candidate for a disease or condition, we would do so on the basis that there is no available therapy for that disease or condition. If standard of care were to evolve or if any of our competitors were to receive full approval on the basis of a confirmatory clinical trial for a drug or biological product for a disease or condition for which we are seeking accelerated approval before we receive accelerated approval, the disease or condition may no longer qualify as one for which there is no available therapy, and accelerated approval of our product candidate may not occur.

Moreover, the FDA may withdraw approval of any product candidate approved under the accelerated approval pathway if, for example:

Recently, the accelerated approval pathway has come under scrutiny within the FDA and by Congress. The FDA has put increased focus on ensuring that confirmatory studies are conducted with diligence and, ultimately, that such studies confirm the benefit. The recently enacted Food and Drug Omnibus Reform Act (FDORA) includes provisions related to the accelerated approval pathway. Pursuant to FDORA, the FDA is authorized to require a post-approval clinical trial to be underway prior to approval or within a specified time period following approval. FDORA also requires the FDA to specify conditions of any required post-approval clinical trial and requires sponsors to submit progress reports for required post-approval studies. In addition, FDORA enables the FDA to initiate enforcement action for the failure to conduct with due diligence a required post-approval clinical trial, including a failure to meet any required conditions specified by the FDA or to submit timely reports.

Failure to obtain accelerated approval for our product candidates could result in a longer time period to commercialization of such product candidate, if any, and could increase the cost of development of such product candidate and harm our competitive position in the marketplace.

19

Table of Contents

Our products and product candidates may have serious adverse, undesirable or unacceptable side effects or even cause death, and we or others may identify undesirable or unacceptable side effects caused by VYVGART or any of our products or product candidates after they have received marketing approval.

Undesirable side effects that may be caused by our product candidates, or by the combination of our product candidates with other medical products, could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in more restrictive labeling or the delay or denial of regulatory approval by the Relevant Regulatory Authorities. While our preclinical trials and clinical trials for our product candidates to date show that our product candidates have generally been well tolerated from a risk-benefit perspective, we have observed adverse events and treatment emergent adverse events (TEAEs) in our clinical trials to date, and we may see additional adverse events and TEAEs in our ongoing and future clinical trials. Such side effects may be more serious than those observed to date, and as a result, our ongoing and future clinical trials may be negatively impacted. Moreover, as we seek to develop product candidates, including products in new indications, patients may experience new or more serious effects. Drug-related side effects could affect patient recruitment, the ability of enrolled patients to complete the clinical trial, result in potential product liability claims, damage sales of our existing products, result in significant reputational damage for us and our product development, and other issues including the delay of other programs.

Additionally, if we or others identify undesirable or unacceptable side effects caused by VYVGART or any of our other product candidates after they receive marketing approval, a number of potentially significant negative consequences could arise, including:

Any of these events could negatively impact us, our collaborators or our potential future partners. Further, the Relevant Regulatory Authorities could require a change of label or even revoke the license, which could harm our reputation and have a material adverse effect on our ability to commercialize VYVGART.

If our target patient population is smaller than expected, we are unable to successfully enroll and retain patients in our clinical trials, or experience significant delays in doing so, we may not realize the full commercial potential of any products or product candidates.

Currently, we mainly develop products or product candidates for the treatment of rare diseases for which the target patient population can be small. If the actual number of patients with these disorders is smaller than we expected, we may encounter difficulties in enrolling sufficient patients in our clinical trials, thereby delaying or preventing

20

Table of Contents

development and approval of our products or product candidates. Physicians, who are an important source of referral of patients for clinical trials, may also be less familiar with these rare diseases and may therefore fail to identify these conditions in their patients and therefore may not refer them to our clinical trials.

Patient enrollment, a significant factor in the timing of clinical trials, depends on many factors, including the size and nature of the patient population, eligibility criteria for the clinical trial, the proximity of patients to clinical sites, competition for patient recruitment from competing clinical trials, the design of the clinical protocol, the eligibility criteria for the clinical trials, the availability of alternate approved therapies for the indication the clinical trial is investigating, and clinicians’ and patients’ perceptions as to the potential advantages of the drug being studied in relation to other available therapies. We compete with other companies to enroll target patient populations, as set forth in Item 3.D. “Risk Factors—Risk Factors Related to Commercialization of argenx’s Products and Product Candidates, Including for New Indications—We face significant competition for our drug discovery and development efforts.” Even if product candidates obtain significant market share for their approved indications, because certain potential target populations are small, we may never recoup our investment in such product candidate without obtaining regulatory approval for additional indications for such product candidates.

Even once enrolled, we may be unable to retain a sufficient number of patients to complete any of our clinical trials. In addition, any negative results we may report in clinical trials of our drug candidates may make it difficult or impossible to recruit and retain patients in other clinical trials of that same drug candidate. Delays in the completion of any clinical trial of our product candidates will increase our costs, slow down our product candidate development and approval process and delay or potentially jeopardize our ability to commence product sales and generate revenue. In addition, some of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product candidates.

In addition, certain of patients enrolled in our clinical trials are located in areas subject to conflict, hostilities or war, or other disruptive events outside of our control. See Item 3.D. “Risk Factors—Risk Factors Related to argenx’s Organization and Operations—‘Global geo- and socio-political threats and macro-economic uncertainty and other unforeseen political crises could materially and adversely affect our business and financial performance.’ and ‘We face risks related to natural disasters and public health issues, that could negatively affect our business and financial condition.”

Risk Factors Related to argenx’s Dependence on Third Parties

We rely, and expect to continue to rely, on third parties to conduct some of our research activities and clinical trials and for parts of the development and commercialization of our existing and future research programs, products and product candidates. If our relationships with such third parties are not successful, our business may be adversely affected.

We have relied upon and plan to continue to rely upon third parties, including independent clinical investigators, CROs, CMOs and other third-party service providers, to assist us in the conduct of certain of our research activities and clinical trials and to monitor and manage data for our ongoing preclinical trials and clinical trials. We also depend on our collaborators and on medical institutions and CROs to conduct our research activities and clinical trials in compliance with regulatory and legal requirements, including GCPs or GMPs, our standard operating procedures and our applicable protocols. Nevertheless, we are responsible for ensuring that each of our preclinical trials and clinical trials is conducted in accordance with the applicable protocol, legal and regulatory requirements and scientific standards, and our reliance on these third parties does not relieve us of our regulatory responsibilities. To the extent our collaborators or the CROs or investigators fail to enroll participants for our clinical trials, fail to conduct the clinical trial to GCP standards or in full compliance with legal and regulatory requirements or are delayed for a significant time in the execution of clinical trials, including achieving full enrollment, we may be affected by increased costs, program delays or both, which may harm our business.

In addition, we are, and expect to continue to be, dependent on partnerships with partners and licensees relating to the development and commercialization of our existing and future research programs, products and product candidates. We currently have collaborative research relationships with various pharmaceutical companies such as

21

Table of Contents

AbbVie, Zai Lab, Genmab A/S (Genmab) and with various academic and research institutions worldwide for the development of product candidates resulting from such collaborations. We also have distribution agreements with Medison, Genpharm and Handok for the distribution of VYVGART. We had, have and will continue to have discussions on potential partnering opportunities with various pharmaceutical companies. If we fail to enter into or maintain collaborations on reasonable terms or at all, our ability to develop our existing or future research programs and product candidates and to commercialize our existing or future products could be delayed, the commercial potential of our products could change and our costs of development and commercialization could increase.

While we have agreements governing our relationships with these third parties, we have limited influence over their actual performance and control only certain aspects of their activities. If independent investigators, third-party service providers or CROs fail to devote sufficient resources to the development of our product candidates, or if their performance is substandard, it may delay or compromise the prospects for approval and commercialization of any product candidates that we develop. In addition, regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we, our investigators or any of our CROs fail to comply with applicable GCPs, the clinical data generated in our clinical trials may be deemed unreliable and the Relevant Regulatory Authorities or comparable regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. Upon inspection by a given regulatory authority, such regulatory authority may determine that our clinical trials do not fully comply with GCP regulations, which may require us to repeat clinical trials and delay the regulatory approval process. Our collaborative partners may not adhere or terminate collaboration agreements with all associated consequences or disagree on the interpretation of contractual terms. We may not be able to control our collaborative partners’ compliance with all applicable requirements for the commercialization of our products, which could adversely affect such commercialization and the profitability of such products. Failures by our collaborative partners to meet their contractual, regulatory, or other obligations to us or any disruption in the relationships between us and our collaborative partners, could have a material adverse effect on our product pipeline and business.

We face significant competition in establishing successful relationships with third-party service providers and appropriate collaborative partners. These third-party service providers may have contractual relationships with other entities, some of which may be our competitors, which may draw their time and resources away from our programs. In addition, some of our third-party service providers or CROs have the ability to terminate their respective agreements with us, and if such agreements terminate, we may not be able to enter into arrangements with alternative CROs or investigators or to do so on commercially reasonable terms. In addition, we may not be able to find appropriate collaboration partners. Our ability to reach a definitive agreement for a partnership will depend, among other things, upon an assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed partnership and the proposed collaborator’s evaluation of a number of factors. These factors may include the design or results of clinical trials, the likelihood of regulatory approval, the potential market for the subject product candidate, the costs and complexities of manufacturing and delivering such product candidate to patients, the potential of competing products, the existence of uncertainty with respect to our ownership of technology, which can exist if there is a challenge to such ownership regardless of the merits of the challenge and industry and market conditions generally. The collaborator may also consider alternative product candidates or technologies for similar indications that may be available to collaborate on and whether such a partnership could be more attractive than the one with us.

Disruptions caused by our reliance on third parties for our manufacturing process may delay or disrupt our business, product development and commercialization efforts.

We do not have the ability to internally source the raw materials necessary to produce our products or product candidates, and do not currently have, nor do we plan to acquire, the infrastructure or capability internally to manufacture our products or product candidates and depend on a worldwide supply chain and third parties for both. Disruptions caused by our reliance on such third-party suppliers, service providers and manufacturers may delay or disrupt our business, product development and commercialization efforts.

22

Table of Contents

Reliance on Third-Party Suppliers and Service Providers

For some of our raw materials, we rely on a single source of supply and there are limited supplies of the raw materials. If we were to experience an unexpected loss of supply of or if any supplier was unable to meet our demand for any of our products and product candidates, including for example if VYVGART is approved for additional indications, we could experience delays in our research or planned clinical trials or risk shortages in commercial supply which could materially impact our revenue potential. These issues could be made worse during a pandemic or due to geopolitical events, including trade disputes or economic sanctions enacted as a result of international conflict.

Additionally, certain of the raw materials required in the manufacture and the formulation of our products and product candidates may be derived from biological sources, including mammalian tissues, bovine serum and human serum albumin. There are certain European regulatory restrictions on using these biological source materials including rigorous testing requirements, which could limit or delay production. If there are changes in the regulation requirements that our suppliers are unable to meet, our clinical development or commercial activities may be delayed or interrupted.

We may not be able to engage a back-up or alternative supplier or service provider in a timely manner or at all if any of these third parties were to cease or interrupt production or otherwise fail to supply these materials, products, or services to us for any reasons, including due to regulatory requirements or actions (including recalls), adverse financial developments at or affecting the supplier, failure by the supplier to comply with cGMPs, contamination, business interruptions, or labor shortages or disputes. Interruptions in the supply of these materials, products or services may also result from international conflict, trade disputes or economic sanctions enacted by, or imposed on, the U.S., the UK, the EU or any other country or region.

Reliance on Third-Party Manufacturing

We rely on and expect to continue to rely on CMOs. We also rely on certain third parties to perform filling, finishing, distribution, laboratory testing and other services related to the manufacture of our products and product candidates.

Although we do not control the manufacturing process at our CMOs and are completely dependent on them for the production of our products and product candidates in accordance with relevant regulations (such as cGMPs), we are responsible for ensuring that our products comply with regulatory requirements. If our CMOs cannot successfully manufacture material that conforms to our specifications and the strict regulatory requirements of the Relevant Regulatory Authorities or other comparable regulatory authorities, our business could be adversely affected in a number of ways, including an inability to initiate or continue clinical trials of product candidates under development, delay in submitting regulatory applications, or receiving regulatory approvals for product candidates, including new indications, subjecting third-party manufacturing facilities to additional inspections by regulatory authorities, requirements to cease distribution or to recall batches of our products or product candidates and an inability to meet commercial demands for our marketed products.

We contract with Lonza Sales AG (Lonza) based in Slough, UK, Portsmouth, U.S, Singapore and Visp, Switzerland and FUJIFILM Diosynth Biotechnologies Denmark ApS (Fujifilm) based in Denmark for activities relating to the development of cell banks, development of our manufacturing processes and the manufacturing of drug substance, and use additional contract manufacturers to fill, test, label, package, store and distribute our (investigational) drug products. Our products and product candidates are biologics and require multiple processing steps that are more difficult than those required for most small molecule chemical pharmaceuticals. Problems with these manufacturing processes, such as capacity issues, or even minor deviations from the normal process or from the materials used in the manufacturing process, which may not be detectable by us in a timely manner, could lead to manufacturing failures or product defects, resulting in lot failures, product recalls, product liability claims and insufficient inventory.

We face risks inherent in relying on limited CMOs, as any failure in their ability to successfully manufacture our products or product candidates as described above or any disruption, such as a fire, pandemic, natural hazards or vandalism at the CMO could significantly interrupt our manufacturing capability. Alternative production plans in place or disaster-recovery facilities available to us may not be sufficient. In case of a disruption, we may have to establish

23

Table of Contents

additional alternative manufacturing sources. This would require substantial investment on our part, which we may not be able to obtain on commercially acceptable terms or at all. Additionally, we may experience significant manufacturing delays as we build or locate replacement facilities and seek and obtain necessary regulatory approvals. If this occurs, we will be unable to satisfy manufacturing needs on a timely basis, if at all. Also, operating any new facilities may be more expensive than operating at our current facilities. Further, business interruption insurance may not adequately compensate us for any losses that may occur, and we would have to bear the additional cost of any disruption. For these reasons, a significant disruptive event of the manufacturing facility could have drastic consequences, including placing our financial stability at risk.

Accuracy and timing of our financial reporting is partially dependent on information received from third-party partners, which we do not control.

We have collaborated, and plan to continue to collaborate, with third parties, including distributor and licensing partners, on certain product candidates. As part of some of these collaborations, our collaboration partners are responsible for providing us with financial information regarding specific projects, including funds spent, liabilities incurred and expected future costs, on which we rely for our own financial reporting. If our collaboration partners fail to provide us with the necessary financial information within the agreed upon timeframes, or if such financial information proves inaccurate, it would adversely impact the timing and accuracy of our own financial reporting. Any inaccuracy in our financial reporting could cause investors to lose confidence in our financial reporting. This in turn may lead to reputational damage or affect our ability to obtain, and the terms of, any future financing, which may harm our business.

We and our third-party manufacturers and suppliers may become exposed to liability, fines, penalties or other sanctions and substantial expenses in connection with environmental compliance or remediation activities.

Our third-party manufacturers and suppliers operations, including research, development, testing and manufacturing activities, are subject to numerous environmental, health and safety laws and regulations. These laws and regulations govern, among other things, the controlled use, handling, release and disposal of and the maintenance of a registry for, hazardous materials and biological materials, laboratory procedures and exposure to pathogens. We do not have control over our manufacturers’ or suppliers’ compliance with environmental, health and safety laws and regulations. If we, or they fail to comply with such laws and regulations, we could be subject to liability, fines, penalties or other sanctions and incur substantial expenses to comply or remediate the activities.

We face a risk of environmental liability inherent in our current and historical activities, including liability relating to releases of or exposure to hazardous or biological materials. Environmental, health and safety laws and regulations are becoming more stringent. We may be required to incur substantial expenses in connection with future environmental compliance or remediation activities, in which case, our production and development efforts may be interrupted or delayed, and our financial condition and results of operations may be materially adversely affected.

Risk Factors Related to argenx’s Business and Industry

Our employees may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, or insider trading violations, which could significantly harm our business.

We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include intentional failures to comply with governmental regulations, comply with healthcare fraud and abuse and anti-kickback laws and regulations in the U.S. and other markets, or failure to report financial information or data accurately or disclose unauthorized activities to us. In particular, sales, marketing and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, misconduct, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements. Employee misconduct could also involve the improper use of material information, including improper trading based upon, information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. We maintain a global compliance program and remain focused on its evolution and enhancement. Our program includes efforts such as risk assessment and monitoring, fostering a culture encouraging employees and third parties to raise good

24

Table of Contents

faith questions or concerns, and defined processes and systems for reviewing and remediating allegations and identified potential concerns. It is not always possible, however, to identify and deter employee misconduct, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to comply with these laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business and results of operations, including the imposition of significant fines or other sanctions.

We may become exposed to costly and damaging liability claims.

We are exposed to potential product liability and professional indemnity risks that are inherent in the research, development, manufacturing, marketing and use of pharmaceutical products and marketing of human therapeutic products. The current and future use of products and product candidates by us and our collaborators in clinical trials and the sale of any approved products may further expose us to liability claims. If any of our products or product candidates were to cause adverse side effects during clinical trials or after approval of the product candidate, we may be exposed to substantial liabilities. These claims might be made by patients who use the product, healthcare providers, pharmaceutical companies, physicians, payors, caregivers, investors, employees, government agencies, or our collaborators or others selling such products. Physicians and patients may not comply with any warnings that identify known potential adverse effects and patients who should not use our product candidates. Any claims against us, regardless of their merit, could be difficult and costly to defend and could materially adversely affect the market for our products and product candidates or any prospects for commercialization of our products and product candidates. Any such claims, regardless of their merit, could also adversely affect our reputation and the trust that physician and patients place in our products. Product liability risk in the EU is likely to increase in the future if plaintiff-friendly reforms to the current EU legislation, which are currently at an advanced stage of the EU legislative process, are formally adopted.

Regardless of the merits or eventual outcome litigation or liability claims may result in: