Rock Springs Capital Management LP
Position in JANX — Janux Therapeutics, Inc.
CIK 1595725
Baltimore, MD
Position in JANX
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$5,101,425
+$150,013 QoQ
Shares Held
367,009
+2.3% QoQ
Ownership
0.602%
of shares outstanding
% of Portfolio
0.30%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2024
6 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in JANX Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026Rock Springs Capital Management LP holds $1,246,050,197 across 66 Biotechnology names. JANX ranks #45 (0.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | RVMD |
Revolution Medicines, Inc.
|
1,209,465 | $117,620,471 | |
| 2 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
170,999 | $89,512,846 | |
| 3 | MIRM |
Mirum Pharmaceuticals, Inc.
|
811,294 | $74,947,339 | |
| 4 | ARGX |
Argenx SE
|
98,500 | $71,929,625 | |
| 5 | RYTM |
Rhythm Pharmaceuticals, Inc.
|
689,748 | $59,987,383 | |
| 6 | INSM |
INSMED Inc
|
314,300 | $51,394,336 | |
| 7 | ASND |
Ascendis Pharma A/S
|
194,000 | $44,373,620 | |
| 8 | XENE |
Xenon Pharmaceuticals Inc.
|
763,020 | $44,369,613 |
All Filings in JANX
Export CSV
6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $5,101,425 | 367,009 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $4,951,412 | 358,798 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $5,141,345 | 210,366 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $4,857,144 | 210,266 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $5,520,582 | 204,466 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $10,947,109 | 204,466 | Shares | Sole | 2025-02-14 | |
| No filing history on record for this holder in this stock. | ||||||