Hudson Bay Capital Management LP
Position in ACAD — Acadia Pharmaceuticals Inc
CIK 1393825
STAMFORD, CT
Position in ACAD
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$9,916,963
+$8,047,263 QoQ
Shares Held
445,506
+536.4% QoQ
Ownership
0.260%
of shares outstanding
% of Portfolio
0.07%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2020
19 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in ACAD Over Time
Shares Held
Position Value (USD)
Derivatives in ACAD
reported options exposure · as of Mar 31, 2024CallValue
$1,414,485
CallShares
76,500
PutValue
$0
PutShares
0
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 $537,145,014 across 151 Biotechnology names. ACAD ranks #16 (1.8% 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
|
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 ACAD
Export CSV
21 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $9,916,963 | 445,506 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $1,869,700 | 70,000 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $1,500,202 | 70,300 | Shares | Sole | 2025-12-15 | |
| 2025-06-30 | $4,098,300 | 190,000 | Shares | Sole | 2025-08-18 | |
| 2025-03-31 | $5,164,879 | 310,950 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $4,862,750 | 265,000 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $5,767,500 | 375,000 | Shares | Sole | 2024-11-13 | |
| 2024-06-30 | $6,296,875 | 387,500 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $1,414,485 | 76,500 | Call | Sole | 2024-05-15 | |
| 2024-03-31 | $4,160,250 | 225,000 | Shares | Sole | 2024-05-15 | |
| 2023-03-31 | $941,000 | 50,000 | Shares | Sole | 2023-05-16 | |
| 2022-12-31 | $3,184,000 | 200,000 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $2,863,000 | 175,000 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $3,945,200 | 280,000 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $484,400 | 20,000 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $1,050,300 | 45,000 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $3,753,860 | 226,000 | Shares | Sole | 2021-12-29 | |
| 2021-09-30 | $2,840,310 | 171,000 | Call | Sole | 2021-12-29 | |
| 2021-06-30 | $1,463,400 | 60,000 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $774,000 | 30,000 | Shares | Sole | 2021-05-14 | |
| 2020-09-30 | $1,237,500 | 30,000 | Shares | Sole | 2020-11-12 | |
| No filing history on record for this holder in this stock. | ||||||