Hudson Bay Capital Management LP
Position in ABOS — Acumen Pharmaceuticals, Inc.
CIK 1393825
STAMFORD, CT
Position in ABOS
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$2,549,850
+$263,152 QoQ
Shares Held
955,000
-1.4% QoQ
Ownership
1.32%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#11
of 96 holders
Holding Since
Dec 2022
14 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ABOS Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026Hudson Bay Capital Management LP holds $565,820,903 across 77 Biotechnology names. ABOS ranks #34 (0.5% 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 ABOS
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $2,549,850 | 955,000 | Shares | Sole | 2026-08-14 | |
| 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 | |
| 2025-03-31 | $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 | 2023-11-14 | |
| 2023-06-30 | $1,899,950 | 395,000 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $1,241,012 | 305,668 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $1,296,000 | 240,000 | Shares | Sole | 2023-02-14 | |
| No filing history on record for this holder in this stock. | ||||||