Hudson Bay Capital Management LP
Position in REGN — Regeneron Pharmaceuticals, Inc.
CIK 1393825
STAMFORD, CT
Position in REGN
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$24,725,252
+$4,558,605 QoQ
Shares Held
32,001
+22.5% QoQ
Ownership
0.031%
of shares outstanding
% of Portfolio
0.17%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2020
13 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in REGN Over Time
Shares Held
Position Value (USD)
Derivatives in REGN
reported options exposure · as of Jun 30, 2025CallValue
$0
CallShares
0
PutValue
$630,000
PutShares
1,200
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 $534,286,565 across 150 Biotechnology names. REGN ranks #3 (4.6% 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.
This page
|
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
|
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 REGN
Export CSV
17 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $24,725,252 | 32,001 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $20,166,647 | 26,127 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $18,999,665 | 33,791 | Shares | Sole | 2025-12-15 | |
| 2025-06-30 | $34,837,950 | 66,358 | Shares | Sole | 2025-08-18 | |
| 2025-06-30 | $630,000 | 1,200 | Put | Sole | 2025-08-18 | |
| 2025-03-31 | $13,056,893 | 20,587 | Shares | Sole | 2025-05-14 | |
| 2025-03-31 | $1,966,113 | 3,100 | Call | Sole | 2025-05-14 | |
| 2025-03-31 | $9,893,988 | 15,600 | Put | Sole | 2025-05-14 | |
| 2024-12-31 | $10,689,223 | 15,006 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $30,855,996 | 29,352 | Shares | Sole | 2024-11-13 | |
| 2024-06-30 | $36,786,050 | 35,000 | Put | Sole | 2024-08-14 | |
| 2024-06-30 | $16,877,439 | 16,058 | Shares | Sole | 2024-08-14 | |
| 2023-12-31 | $36,449,035 | 41,500 | Shares | Sole | 2024-02-14 | |
| 2023-06-30 | $431,124 | 600 | Shares | Sole | 2023-08-14 | |
| 2022-12-31 | $9,667,966 | 13,400 | Shares | Sole | 2023-02-14 | |
| 2021-03-31 | $17,979,320 | 38,000 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $18,599,735 | 38,500 | Shares | Sole | 2021-03-04 | |
| No filing history on record for this holder in this stock. | ||||||