argenx SE
argenx SE (ARGX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ARGX · as of Sep 30, 2025
Ownership Breakdown
500
Institutional Holders
▲ 37 vs Q2
$22.52B
Total Inst. Value
▲ $4.81B vs Q2
61.88M
Shares Outstanding
freeFloat 99.71%
30.52M
13F Shares Held
▼ 1.60M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ARGX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC biological products, (no diagnostic substances) | 5.69M | 9.33% | 9.33% | $4.20T | Nov 13, 2025 | ▲ 268.8K |
PRICE T ROWE ASSOCIATES INC /MD/ biological products, (no diagnostic substances) | 3.64M | 5.96% | 5.96% | $2.69T | Nov 14, 2025 | ▼ 1.34M |
JANUS HENDERSON GROUP PLC biological products, (no diagnostic substances) | 2.58M | 4.22% | 4.22% | $1.90T | Nov 14, 2025 | ▲ 9.9K |
ARTISAN PARTNERS LIMITED PARTNERSHIP biological products, (no diagnostic substances) | 2.19M | 3.58% | 3.58% | $1.61T | Nov 12, 2025 | ▼ 163.3K |
CAPITAL WORLD INVESTORS biological products, (no diagnostic substances) | 1.96M | 3.21% | 3.21% | $1.45T | Nov 13, 2025 | ▲ 8.4K |
AVORO CAPITAL ADVISORS LLC biological products, (no diagnostic substances) | 990.0K | 1.62% | 1.62% | $730.18B | Nov 14, 2025 | ▼ 185.0K |
CLEARBRIDGE INVESTMENTS, LLC biological products, (no diagnostic substances) | 756.9K | 1.24% | 1.24% | $558.23B | Nov 13, 2025 | ▼ 16.0K |
WELLINGTON MANAGEMENT GROUP LLP biological products, (no diagnostic substances) | 730.0K | 1.20% | 1.20% | $538.41B | Nov 14, 2025 | ▲ 324.7K |
CITADEL ADVISORS LLC biological products, (no diagnostic substances) | 713.6K | 1.17% | 1.17% | $526.29B | Nov 14, 2025 | ▼ 152.4K |
RTW INVESTMENTS, LP biological products, (no diagnostic substances) | 673.5K | 1.10% | 1.10% | $496.74B | Nov 14, 2025 | — held |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
29
Increased
+1.89M shares0
New Positions
first time holders20
Decreased
−2.23M shares0
Sold Out
fully exitedNet shares change (top 50)
335.9K
+1.89M / −2.23M
Net new holders
+9
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ARGX insider trading · insider activity
Source: SEC Form 4
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
argenx SE (ARGX) is primarily owned by institutional investors, who hold approximately 49.3% of total shares outstanding. Company insiders own approximately 0.29%, while retail and public investors account for the remaining 50.39%.
The largest institutional shareholder of argenx SE is FMR LLC, holding approximately 5.69 million shares — equal to 9.33% of outstanding shares — as of September 30, 2025.
A total of 500 institutional investors currently hold ARGX stock, with a combined institutional value of approximately $22.52 billion as of the most recent 13F filing period.
Frequently asked questions
ARGX ownershipargenx SE (ARGX) is primarily owned by institutional investors, who hold approximately 49.3% of shares. The largest shareholder is FMR LLC with a 9.33% stake. Company insiders hold 0.29%. Data sourced from SEC Form 13F as of September 30, 2025.