FMR LLC and Abigail P. Johnson filed Amendment No. 13 to their beneficial ownership statement with the SEC on November 5, 2026, disclosing a combined 9.9% interest in the common stock of argenx SE as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: FMR LLC and Abigail P. Johnson each reported beneficially owning 6,178,792.12 shares of argenx SE common stock, representing 9.9% of the class.
  • Sole voting power: FMR LLC reported sole voting power over 5,962,639.48 shares; Abigail P. Johnson reported sole voting power of 0.00 shares.
  • Sole dispositive power: Both FMR LLC and Abigail P. Johnson reported sole dispositive power over 6,178,792.12 shares, with no shared dispositive power.
  • Event date: The date of the event requiring this filing was September 30, 2026.
  • Amendment number: This filing is Amendment No. 13, signed on November 4, 2026, by Stephanie J. Brown under a power of attorney on behalf of both reporting persons.
  • Third-party interest: According to the filing, one or more other persons hold the right to receive dividends or sale proceeds from the common stock, though no single other person's interest exceeds 5% of the total outstanding shares.

FMR LLC's Position in argenx SE, a Clinical-Stage Immunology Company

argenx SE, identified in the filing by CUSIP number N0610Q109, is a biopharmaceutical company whose principal executive offices are located at Industriepark Zwijnaarde 7, Building C, B-9052, Zwijnaarde, Belgium. FMR LLC, a Delaware-organized holding company with its principal business office at 245 Summer Street, Boston, Massachusetts 02210, filed this statement in its capacity as a parent holding company, as indicated by its classification under Item 3(g) of the filing.

According to the filing, the securities were "acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control" of argenx SE. The filing identifies Abigail P. Johnson as an individual reporting person with the same aggregate beneficial ownership figure of 6,178,792.12 shares, though she holds no sole or shared voting power. An Exhibit 99 is attached identifying the subsidiaries through which the reported position is held, as required when a parent holding company files under Rule 13d-1(b)(1)(ii)(G).

The filing was signed on November 4, 2026, by Stephanie J. Brown, acting under a power of attorney dated January 3, 2023, on behalf of FMR LLC, and under a separate power of attorney dated January 26, 2023, on behalf of Abigail P. Johnson. No shared voting or dispositive power was reported by either reporting person, and no group membership was identified in the filing.

What Was Disclosed

FMR LLC and Abigail P. Johnson disclosed, via Amendment No. 13 to their ownership statement, a 9.9% beneficial interest in argenx SE common stock totaling 6,178,792.12 shares, based on holdings as of September 30, 2026, filed November 5, 2026.