Position in ARGX
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$21,907,500
+$3,556,290 QoQ
Shares Held
30,000
+37.5% QoQ
Ownership
0.048%
of shares outstanding
% of Portfolio
0.15%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2023
10 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in ARGX Over Time
Shares Held
Position Value (USD)
Derivatives in ARGX
reported options exposure · as of Jun 30, 2024CallValue
$0
CallShares
0
PutValue
$21,502,000
PutShares
50,000
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Biotechnology
Healthcare · as of Mar 31, 2026Hudson Bay Capital Management LP holds $536,414,605 across 150 Biotechnology names. ARGX ranks #6 (4.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | BMRN |
Biomarin Pharmaceutical Inc
|
974,776 | $55,065,096 | |
| 2 | APLS |
Apellis Pharmaceuticals, Inc.
|
1,190,416 | $47,890,435 | |
| 3 | REGN |
Regeneron Pharmaceuticals, Inc.
|
32,001 | $24,725,252 | |
| 4 | BNTX |
BioNTech SE
|
275,000 | $24,442,000 | |
| 5 | IONS |
Ionis Pharmaceuticals Inc
|
295,100 | $22,159,059 | |
| 6 | ARGX |
Argenx SE
This page
|
30,000 | $21,907,500 | |
| 7 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
45,000 | $20,094,300 | |
| 8 | IMCR |
Immunocore Holdings plc
|
633,174 | $19,090,196 |
All Filings in ARGX
Export CSV
11 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $21,907,500 | 30,000 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $18,351,210 | 21,822 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $7,744,380 | 10,500 | Shares | Sole | 2025-12-15 | |
| 2025-06-30 | $37,440,516 | 67,923 | Shares | Sole | 2025-08-18 | |
| 2024-06-30 | $6,450,600 | 15,000 | Shares | Sole | 2024-08-14 | |
| 2024-06-30 | $21,502,000 | 50,000 | Put | Sole | 2024-08-14 | |
| 2024-03-31 | $5,581,768 | 14,177 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $37,663,711 | 99,003 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $33,432,314 | 68,003 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $14,395,067 | 36,936 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $15,376,749 | 41,271 | Shares | Sole | 2023-05-16 | |
| No filing history on record for this holder in this stock. | ||||||