Rock Springs Capital Management LP
Position in MIRM — Mirum Pharmaceuticals, Inc.
CIK 1595725
Baltimore, MD
Position in MIRM
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$74,947,339
+$14,733,736 QoQ
Shares Held
811,294
+6.4% QoQ
Ownership
1.33%
of shares outstanding
% of Portfolio
4.43%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in MIRM 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. MIRM ranks #3 (6.0% 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.
This page
|
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 MIRM
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $74,947,339 | 811,294 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $60,213,603 | 762,294 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $55,798,147 | 761,126 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $41,638,503 | 818,206 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $42,877,013 | 951,765 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $60,849,171 | 1,471,564 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $61,639,032 | 1,580,488 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $60,585,979 | 1,772,038 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $46,636,887 | 1,856,564 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $54,655,217 | 1,851,464 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $57,535,162 | 1,820,733 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $47,102,362 | 1,820,733 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $43,133,506 | 1,795,733 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $35,016,793 | 1,795,733 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $37,728,350 | 1,795,733 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $33,427,084 | 1,717,733 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $36,689,900 | 1,666,208 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $24,544,083 | 1,538,814 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $30,390,410 | 1,525,623 | Shares | Sole | 2021-11-15 | |
| 2021-06-30 | $26,345,170 | 1,523,723 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $29,785,496 | 1,502,800 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $26,129,326 | 1,496,525 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $25,583,121 | 1,327,614 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $25,685,448 | 1,319,910 | Shares | Sole | 2020-08-14 | |
| 2020-03-31 | $17,402,000 | 1,243,000 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||