Comparable stake leader
FMR LLC
SEC ownership of ARGENX SE
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001697862.
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- ARGX on Nasdaq
- Parsed ownership sources
- 13F and 13D/G
- Largest SEC-reported holder
- FMR LLC
- Latest 13D/G holder
- FMR LLC
- Latest parsed ownership date
- 31 Mar 2026
- Issuer CIK
- 0001697862
- Issuer location
- Zwijnaarde
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of ARGENX SE (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
Lead comparable stake: 8.7%
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 8.7%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 5
FMR LLC
8.7%
PRICE T ROWE ASSOCIATES INC /MD/
6%
Artisan Partners Limited Partnership
3.8%
JANUS HENDERSON GROUP PLC
4.2%
Capital World Investors
3.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
8.7%
from 13D/G
|
$3,644,702,751
4,991,034 shares
|
— | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
6%
|
$2,689,881,320
3,647,000 shares
|
-$985,796,144 | 30 Sep 2025 |
| Artisan Partners Limited Partnership |
13D/G
13F
Artisan Partners Asset Management Inc. · Company
|
3.8%
|
$1,316,438,506
2,349,776 shares
|
$0 | 30 Jun 2025 |
| JANUS HENDERSON GROUP PLC |
13F
Company
|
4.2%
|
$1,847,592,427
2,541,732 shares
|
— | 31 Mar 2026 |
| Capital World Investors |
13F
Company
|
3.7%
|
$1,647,408,306
2,256,216 shares
|
— | 31 Mar 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
1.7%
|
$745,918,975
1,021,457 shares
|
— | 31 Mar 2026 |
| Avoro Capital Advisors LLC |
13F
Company
|
1.6%
|
$730,250,000
1,000,000 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
1.3%
|
$590,288,301
808,337 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 06 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Recent insider transactions for ARGENX SE
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.