Rock Springs Capital Management LP
Position in AMLX — Amylyx Pharmaceuticals, Inc.
CIK 1595725
Baltimore, MD
Position in AMLX
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$8,975,761
+$2,029,042 QoQ
Shares Held
499,764
0.0% QoQ
Ownership
0.449%
of shares outstanding
% of Portfolio
0.44%
of 13F equity value
Holder Rank
#39
of 207 holders
Holding Since
Mar 2022
15 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in AMLX Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - Specialty & Generic
Healthcare · as of Jun 30, 2026Rock Springs Capital Management LP holds $59,831,908 across 7 Drug Manufacturers - Specialty & Generic names. AMLX ranks #4 (15.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | NBIX |
Neurocrine Biosciences Inc
|
144,750 | $24,396,165 | |
| 2 | ALKS |
Alkermes plc.
|
199,811 | $10,470,096 | |
| 3 | INDV |
Indivior Pharmaceuticals, Inc.
|
245,500 | $10,072,865 | |
| 4 | AMLX |
Amylyx Pharmaceuticals, Inc.
This page
|
499,764 | $8,975,761 | |
| 5 | TLPH |
Talphera, Inc.
|
3,589,186 | $3,696,861 | |
| 6 | TEVA |
Teva Pharmaceutical Industries Ltd
|
59,000 | $1,998,920 | |
| 7 | BCRX |
Biocryst Pharmaceuticals Inc
|
22,124 | $221,240 |
All Filings in AMLX
Export CSV
15 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $8,975,761 | 499,764 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $6,946,719 | 499,764 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $6,037,149 | 499,764 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $6,791,792 | 499,764 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $3,203,487 | 499,764 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $1,215,027 | 343,228 | Shares | Sole | 2025-05-15 | |
| 2024-03-31 | $2,872,410 | 1,011,412 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $7,875,376 | 535,012 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $28,289,242 | 1,545,016 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $33,317,367 | 1,544,616 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $42,625,621 | 1,452,816 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $45,435,087 | 1,229,637 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $11,365,196 | 403,737 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $18,761,300 | 974,107 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $12,828,244 | 998,307 | Shares | Sole | 2022-05-16 | |
| No filing history on record for this holder in this stock. | ||||||