Hudson Bay Capital Management LP
Position in REGN — Regeneron Pharmaceuticals, Inc.
CIK 1393825
STAMFORD, CT
Position in REGN
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$10,911,950
-$13,813,302 QoQ
Shares Held
17,500
-45.3% QoQ
Ownership
0.017%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#283
of 1,322 holders
Holding Since
Dec 2020
14 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
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 Jun 30, 2026Hudson Bay Capital Management LP holds $565,820,903 across 77 Biotechnology names. REGN ranks #12 (1.9% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
390,440 | $193,943,261 | |
| 2 | BMRN |
Biomarin Pharmaceutical Inc
|
825,002 | $47,206,614 | |
| 3 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
148,720 | $44,769,181 | |
| 4 | BNTX |
BioNTech SE
|
260,000 | $24,193,000 | |
| 5 | IMCR |
Immunocore Holdings plc
|
590,000 | $18,732,500 | |
| 6 | TECH |
BIO-TECHNE Corp
|
200,000 | $14,130,000 | |
| 7 | VIR |
Vir Biotechnology, Inc.
|
1,364,000 | $13,899,160 | |
| 8 | PTCT |
Ptc Therapeutics, Inc.
|
159,778 | $13,033,091 |
All Filings in REGN
Export CSV
18 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $10,911,950 | 17,500 | Shares | Sole | 2026-08-14 | |
| 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 | 2021-02-12 | |
| No filing history on record for this holder in this stock. | ||||||