Rock Springs Capital Management LP
Position in AMLX — Amylyx Pharmaceuticals, Inc.
CIK 1595725
Baltimore, MD
Position in AMLX
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$6,946,719
+$909,570 QoQ
Shares Held
499,764
0.0% QoQ
Ownership
0.449%
of shares outstanding
% of Portfolio
0.41%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2022
14 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in AMLX Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - Specialty & Generic
Healthcare · as of Mar 31, 2026Rock Springs Capital Management LP holds $43,551,047 across 7 Drug Manufacturers - Specialty & Generic names. AMLX ranks #2 (16.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | NBIX |
Neurocrine Biosciences Inc
|
150,450 | $19,820,283 | |
| 2 | AMLX |
Amylyx Pharmaceuticals, Inc.
This page
|
499,764 | $6,946,719 | |
| 3 | ALKS |
Alkermes plc.
|
183,986 | $6,505,744 | |
| 4 | INDV |
Indivior Pharmaceuticals, Inc.
|
200,000 | $6,096,000 | |
| 5 | TLPH |
Talphera, Inc.
|
3,589,186 | $2,691,889 | |
| 6 | TEVA |
Teva Pharmaceutical Industries Ltd
|
45,500 | $1,370,460 | |
| 7 | BCRX |
Biocryst Pharmaceuticals Inc
|
12,600 | $119,952 |
All Filings in AMLX
Export CSV
14 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 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. | ||||||