Rock Springs Capital Management LP
Position in XENE — Xenon Pharmaceuticals Inc.
CIK 1595725
Baltimore, MD
Position in XENE
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$44,369,613
+$9,060,955 QoQ
Shares Held
763,020
-3.1% QoQ
Ownership
0.789%
of shares outstanding
% of Portfolio
2.62%
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 XENE 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. XENE ranks #8 (3.6% 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.
This page
|
763,020 | $44,369,613 |
All Filings in XENE
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $44,369,613 | 763,020 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $35,308,658 | 787,788 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $34,197,521 | 851,744 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $29,161,615 | 931,681 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $31,257,897 | 931,681 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $49,072,872 | 1,251,859 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $51,829,699 | 1,316,477 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $49,629,474 | 1,272,877 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $54,052,589 | 1,255,577 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $57,831,876 | 1,255,577 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $40,240,548 | 1,178,002 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $45,353,077 | 1,178,002 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $42,160,691 | 1,178,002 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $46,356,746 | 1,175,672 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $41,730,192 | 1,155,961 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $34,180,033 | 1,123,604 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $25,755,163 | 842,498 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $24,097,505 | 771,367 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $8,909,768 | 583,100 | Shares | Sole | 2021-11-15 | |
| 2021-06-30 | $10,659,950 | 572,500 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $10,247,750 | 572,500 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $7,920,700 | 515,000 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $5,708,920 | 515,711 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $6,467,015 | 515,711 | Shares | Sole | 2020-08-14 | |
| 2020-03-31 | $5,670,000 | 500,000 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||