LYTIR

Company · ARGX

argenx SE

Name as listed on its exchange; filed with the SEC as ARGENX SE.

Nasdaq's symbol directory lists ARGX on Nasdaq as “argenx SE - American Depositary Shares”: an American depositary receipt, a certificate traded in the US for shares of a foreign company.

In the 12 months to Nov 8, 2026: 2 filings by holders of 5% or more; 1 congressional trade disclosure.

All insider filings at the SEC

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. FMR LLC filed Nov 5, 2026 Schedule 13G/A passive 6,178,792 shares filing 9.9%
  2. T. Rowe Price Associates, Inc. filed Aug 14, 2026 Schedule 13G/A passive 2,675,457 shares filing 4.3%

Congress · STOCK Act

The Althing

Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.

  1. Alan Armstrong (R-OK): Purchase Mar 30, 2026 reported Jul 21, 2026 one of 703 trades the member reported that day Senate Stock $1,001 - $15,000

Sources: SEC EDGAR (Forms 4 and 144) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.