# EDGAR Filing Document

**Accession Number:** 0001697862
**File Stem:** 0001104659-25-082118
**Filing Date:** 2025-8
**Character Count:** 17033
**Document Hash:** 221b1a18d33a50dd2af39f7b70215a4f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-082118.hdr.sgml**: 20250825

**ACCESSION NUMBER**: 0001104659-25-082118

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250825

**FILED AS OF DATE**: 20250825

**DATE AS OF CHANGE**: 20250825

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ARGENX SE
- **CENTRAL INDEX KEY:** 0001697862
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** P7
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38097
- **FILM NUMBER:** 251247891

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** INDUSTRIEPARK ZWIJNAARDE 7
- **STREET 2:** BUILDING C B-9052
- **CITY:** ZWIJNAARDE
- **NON US STATE TERRITORY:** GHENT
- **PROVINCE COUNTRY:** C9
- **BUSINESS PHONE:** 32 (9) 310 34 00

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** INDUSTRIEPARK ZWIJNAARDE 7
- **STREET 2:** BUILDING C B-9052
- **CITY:** ZWIJNAARDE
- **NON US STATE TERRITORY:** GHENT
- **PROVINCE COUNTRY:** C9

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** argenx N.V
- **DATE OF NAME CHANGE:** 20170210

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

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**FORM 6-K**

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**REPORT OF FOREIGN PRIVATE ISSUER**

**PURSUANT TO RULE 13a-16 OR 15d-16**

**UNDER THE SECURITIES EXCHANGE ACT OF 1934**

**For the Month of August 2025**

**Commission File Number: 001-38097**

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**ARGENX SE**

(Translation of registrant's name into English)

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**Laarderhoogtweg 25<br> 1101 EB Amsterdam, the Netherlands**

(Address of principal executive offices)

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ⌧ Form 40-F ◻

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ◻

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ◻

**<u>EXPLANATORY NOTE</u>**

On August 25, 2025, argenx SE (the "<u>Company</u>") issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

*The information contained in this Current Report on Form 6-K, including Exhibit 99.1, shall be deemed to be incorporated by reference into the Company's Registration Statements on Forms S-8 (File Nos. [333-225375](https://www.sec.gov/Archives/edgar/data/1697862/000110465918037616/a18-14643_3s8.htm), [333-258253](https://www.sec.gov/Archives/edgar/data/1697862/000110465921097298/tm2123453d1_s8.htm), and [333-274721](https://www.sec.gov/Archives/edgar/data/1697862/000110465923104307/tm2326371d1_s8.htm)), and to be part thereof from the date on which this Current Report on Form 6-K is filed, to the extent not superseded by documents or reports subsequently filed or furnished.*

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| | |
|:---|:---|
| **Exhibit** | **Description** |
| [99.1](tm2524211d1_ex99-1.htm) | [Press Release August 25, 2025](tm2524211d1_ex99-1.htm) |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **ARGENX SE** | **ARGENX SE** |
| Date: August 25, 2025 | By: | /s/ Hemamalini (Malini) Moorthy |
|  |  | Name: Hemamalini (Malini) Moorthy |
|  |  | Title: General Counsel |

---

## Exhibit 99.1

**Exhibit 99.1**

**argenx Announces Positive Topline Results from ADAPT SERON Study of <br> VYVGART in Patients with AChR-Ab Seronegative gMG**

- *Study met primary endpoint (p-value=0.0068)*

- *First global phase 3 study to demonstrate clinically meaningful improvements in disease activity across all three subtypes – MuSK+, LRP4+, triple seronegative*

- *Supplemental Biologics License Application (sBLA) to be submitted to U.S. Food and Drug Administration (FDA) by end of 2025*

**August 25** **, 2025, 7:00 AM CET**

**Amsterdam, the Netherlands** – argenx SE (Euronext & Nasdaq: ARGX), a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases, today announced positive topline data from the pivotal ADAPT SERON study of VYVGART® (IV: efgartigimod alfa-fcab). The study met its primary endpoint (p-value=0.0068), demonstrating that AChR-Ab seronegative gMG patients treated with VYVGART achieved a statistically significant and clinically meaningful improvement in MG-ADL (Myasthenia Gravis Activities of Daily Living) total score compared to placebo.

Based on these results, argenx plans to submit an sBLA to the U.S. FDA seeking expansion of the VYVGART label to include adult AChR-Ab seronegative gMG patients across all three subtypes – MuSK+, LRP4+, triple seronegative. Detailed results from the ADAPT SERON study will be presented at an upcoming medical meeting.

VYVGART was well tolerated and safe across AChR-Ab seronegative subtypes and consistent with the established safety profile in patients with AChR-Ab seropositive gMG and other indications. No new safety concerns were identified.

"The results of the ADAPT SERON study, the largest study to date of AChR-Ab seronegative gMG, confirm that VYVGART now has the potential to be a targeted, effective, safe, and necessary treatment for patients living with gMG, regardless of autoantibody status," said James F. Howard Jr., M.D., Professor of Neurology (Neuromuscular Disease), Medicine and Allied Health, Department of Neurology, The University of North Carolina at Chapel Hill School of Medicine and Principal Investigator for the ADAPT SERON trial. "Paired with our existing knowledge, these data demonstrate that pathogenic IgGs are underlying drivers of gMG across patient subtypes. This is a critical advancement in the management of this debilitating and unpredictable disease for patients with limited treatment options."

"The ADAPT SERON study represents our longstanding commitment to the MG community and our ambition to help all MG patients address this debilitating condition and reach as many MG patients as we can," said Luc Truyen, M.D. Ph.D., Chief Medical Officer, argenx. "The positive outcome of the ADAPT SERON study clearly shows VYVGART's ability to provide meaningful benefit across all AChR-ab seronegative gMG subtypes."

**About ADAPT SERON Study Design**

The Phase 3 ADAPT SERON study was a randomized, double-blind, placebo-controlled, multi-center study evaluating the safety and efficacy of efgartigimod in adults with AChR-Ab seronegative gMG (n=119) across North America, Europe, China, and the Middle East. Part A randomized participants (1:1) received 4 once-weekly infusions of efgartigimod IV or placebo, followed by a 5-week follow-up and primary analysis. Part B was an open-label extension: participants received 2 fixed cycles of 4 once-weekly efgartigimod infusions (4-week interval between cycles); from cycle 3 onward, additional cycles could be started ≥1 week after the last administration of the previous cycle, based on clinical status. The primary endpoint was the MG-ADL total score change from baseline to day 29 in part A. Enrolled participants had a confirmed MG diagnosis by an independent panel of experts, and an MG-ADL total score of 5 or greater. Participants were on a stable dose of at least one gMG treatment prior to randomization, including acetylcholinesterase inhibitors, corticosteroids or nonsteroidal immunosuppressive drugs. Participants were eligible to enroll in ADAPT SERON if they were AChR-Ab seronegative, which included participants who are MuSK-Ab seropositive, LRP4-Ab seropositive, or triple seronegative.

MG-ADL is a validated measure of disease activity in patients living with myasthenia gravis, which evaluates the functional impact of symptoms on daily activities such as speaking, chewing, swallowing, breathing, and limb strength.

**About AChR-Ab seronegative gMG**

gMG is a rare, chronic, neuromuscular autoimmune disease caused by pathogenic IgGs targeting the neuromuscular junction (NMJ), resulting in impaired neuromuscular transmission and debilitating and potentially life-threatening muscle weakness and chronic fatigue. Approx. 80% of patients with gMG have detectable antibodies against the AChR in sera, and these patients are diagnosed as AChR-Ab seropositive gMG. Approximately 20% of patients with gMG do not have detectable serum antibodies directed against AChR and are referred to as AChR-Ab seronegative gMG. These patients may have detectable autoantibodies targeting other NMJ proteins, such as muscle-specific tyrosine kinase (MuSK) and low-density lipoprotein receptor-related protein 4 (LRP4), or others. Anti-MuSK antibodies are detected in approximately 1-10% of patients with gMG, while anti-LRP4 antibodies are detected in approximately 1-5% of patients with gMG. About 10% of patients do not have any detectable autoantibodies against AChR, MuSK or LRP4. These triple seronegative patients have historically been excluded from studies and have a higher disease burden and unmet medical need compared to patients with detectable autoantibodies. Currently, there are no approved treatments available for patients with anti-LRP4 antibodies or for triple seronegative patients.

**Important Safety Information**

**What is VYVGART<sup>®</sup>** **(efgartigimod alfa-fcab)?**

VYVGART is a prescription medicine used to treat a condition called generalized myasthenia gravis, which causes muscles to tire and weaken easily throughout the body, in adults who are positive for antibodies directed toward a protein called acetylcholine receptor (anti-AChR antibody positive).

**IMPORTANT SAFETY INFORMATION**

Do not use VYVGART if you have a serious allergy to efgartigimod alfa or any of the other ingredients in VYVGART. VYVGART can cause serious allergic reactions and a decrease in blood pressure leading to fainting.

**VYVGART may cause serious side effects, including:**

&nbsp;&nbsp;&nbsp;&nbsp;· **Infection.** VYVGART may increase
the risk of infection. The most common infections were urinary tract and respiratory tract infections. Signs or symptoms of an infection
may include fever, chills, frequent and/or painful urination, cough, pain and blockage of nasal passages/sinus, wheezing, shortness of
breath, fatigue, sore throat, excess phlegm, nasal discharge, back pain, and/or chest pain.

&nbsp;&nbsp;&nbsp;&nbsp;· **Allergic Reactions (hypersensitivity reactions).** VYVGART
can cause allergic reactions such as rashes, swelling under the skin, and shortness of breath. Serious allergic reactions, such as trouble
breathing and decrease in blood pressure leading to fainting have been reported with VYVGART.

&nbsp;&nbsp;&nbsp;&nbsp;· **Infusion-Related Reactions.** VYVGART
can cause infusion-related reactions. The most frequent symptoms and signs reported with VYVGART were high blood pressure, chills, shivering,
and chest, abdominal, and back pain.

Tell your doctor if you have signs or symptoms of an infection, allergic reaction, or infusion-related reaction. These can happen while you are receiving your VYVGART treatment or afterward. Your doctor may need to pause or stop your treatment. Contact your doctor immediately if you have signs or symptoms of a serious allergic reaction.

**Before taking VYVGART, tell your doctor if you:**

&nbsp;&nbsp;&nbsp;&nbsp;· take any medicines, including prescription and non-prescription medicines, supplements, or herbal medicines,

&nbsp;&nbsp;&nbsp;&nbsp;· have received or are scheduled to receive a vaccine (immunization), or

&nbsp;&nbsp;&nbsp;&nbsp;· have any allergies or medical conditions, including if you are pregnant or planning to become pregnant,
or are breastfeeding.

**What are the common side effects of VYVGART?**

The most common side effects of VYVGART are respiratory tract infection, headache, and urinary tract infection.

These are not all the possible side effects of VYVGART. Call your doctor for medical advice about side effects. You may report side effects to the US Food and Drug Administration at 1-800-FDA-1088.

**Please see the full** **<u>Prescribing Information</u> for VYVGART and talk to your doctor.**

**This press release contains inside information within the meaning of Article 7(1) of the EU Market Abuse Regulation (Regulation 596/2014).**

**About VYVGART**

VYVGART is a human IgG1 antibody fragment that binds to the neonatal Fc receptor (FcRn), resulting in the reduction of circulating IgG autoantibodies. It is the first approved FcRn blocker in the United States, EU, China and Canada for the treatment of adults with generalized myasthenia gravis (gMG) who are anti-acetylcholine receptor (AChR) antibody positive and in Japan for the treatment of adults with gMG who do not have sufficient response to steroids or non-steroidal immunosuppressive therapies (ISTs).

**About argenx**

argenx is a global immunology company committed to improving the lives of people suffering from severe autoimmune diseases. Partnering with leading academic researchers through its Immunology Innovation Program (IIP), argenx aims to translate immunology breakthroughs into a world-class portfolio of novel antibody-based medicines. argenx developed and is commercializing the first approved neonatal Fc receptor (FcRn) blocker and is evaluating its broad potential in multiple serious autoimmune diseases while advancing several earlier stage experimental medicines within its therapeutic franchises. For more information, visit <u>www.argenx.com</u> and follow us on <u>LinkedIn</u>, <u>Instagram</u>, <u>Facebook</u>, and <u>YouTube</u>.

**Media:**

Colin McBean

<u>cmcbean@argenx.com</u>

**Investors:**

Alexandra Roy

<u>aroy@argenx.com</u>

**FORWARD LOOKING STATEMENTS**

The contents of this announcement include statements that are, or may be deemed to be, "forward-looking statements." These forward-looking statements can be identified by the use of forward-looking terminology, including the terms "advance," "aim," "committed," "may," "plan," "potential," and "will" and include statements argenx makes concerning its plan to submit an sBLA to the U.S. FDA seeking expansion of the VYVGART label to include adult seronegative gMG patients across the three gMG subtypes, MuSK+, LRP4+and triple seronegative subtypes by end of 2025; its plan to present data from the ADAPT SERON study at an upcoming medical meeting; the potential for VYVGART to be a targeted, effective, safe, and necessary treatment for patients living with gMG, regardless of autoantibody status; its commitment to the MG community and ambition to help all MG patients address this debilitating condition and reach as many MG patients as it can; its ability to provide meaningful benefit across all seronegative gMG subtypes; its commitment to improving the lives of people suffering from severe autoimmune diseases; and its goal of translating immunology breakthroughs into a world-class portfolio of novel antibody-based medicines. By their nature, forward-looking statements involve risks and uncertainties and readers are cautioned that any such forward-looking statements are not guarantees of future performance. argenx's actual results may differ materially from those predicted by the forward-looking statements as a result of various important factors, including but not limited to, the results of argenx's clinical trials; expectations regarding the inherent uncertainties associated with the development of novel drug therapies; preclinical and clinical trial and product development activities and regulatory approval requirements; the acceptance of its products and product candidates by its patients as safe, effective and cost-effective; the impact of governmental laws and regulations, including tariffs, export controls, sanctions and other regulations on its business; its reliance on third-party suppliers, service providers and manufacturers; inflation and deflation and the corresponding fluctuations in interest rates; and regional instability and conflicts. A further list and description of these risks, uncertainties and other risks can be found in argenx's U.S. Securities and Exchange Commission (SEC) filings and reports, including in argenx's most recent annual report on Form 20-F filed with the SEC as well as subsequent filings and reports filed by argenx with the SEC. Given these uncertainties, the reader is advised not to place any undue reliance on such forward-looking statements. These forward-looking statements speak only as of the date of publication of this document. argenx undertakes no obligation to publicly update or revise the information in this press release, including any forward-looking statements, except as may be required by law.