Hudson Bay Capital Management LP
Position in ABOS — Acumen Pharmaceuticals, Inc.
CIK 1393825
STAMFORD, CT
Position in ABOS
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$2,286,698
+$756,948 QoQ
Shares Held
968,940
+33.6% QoQ
Ownership
1.34%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#10
of 84 holders
Holding Since
Dec 2022
14 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in ABOS Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026Hudson Bay Capital Management LP holds $534,286,565 across 150 Biotechnology names. ABOS ranks #42 (0.4% 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 ABOS
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $2,286,698 | 968,940 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $1,529,750 | 725,000 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $1,239,756 | 725,004 | Shares | Sole | 2025-12-15 | |
| 2025-06-30 | $957,004 | 825,004 | Shares | Sole | 2025-08-18 | |
| 2025-03-31 | $847,000 | 770,000 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $1,229,800 | 715,000 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $1,577,280 | 636,000 | Shares | Sole | 2024-11-13 | |
| 2024-06-30 | $1,621,400 | 670,000 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $2,268,000 | 560,000 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $2,167,296 | 564,400 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $2,178,750 | 525,000 | Shares | Sole | 2023-12-07 | |
| 2023-06-30 | $1,899,950 | 395,000 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $1,449,420 | 357,000 | Shares | Sole | 2023-05-16 | |
| 2022-12-31 | $1,296,000 | 240,000 | Shares | Sole | 2023-02-14 | |
| No filing history on record for this holder in this stock. | ||||||