Arkolith/Funds/Rock Springs Capital Management LP

Rock Springs Capital Management LP

CIK: 1595725Q1 2026
Active Filer
Portfolio Value
$1.7B
Positions
109
New Buys
11
9 sold
Changes
38 ↑ / 24 ↓

Top HoldingsQ1 2026

109 total positions
#SecurityValueShares% PortChangeΔ Shares
1REVOLUTION MEDICINES INC
COM
$117.6M1.21M6.9%
REDUCED
-125,805
2ELI LILLY & CO
COM
$90.8M98.7K5.4%
REDUCED
-6,700
3MADRIGAL PHARMACEUTICALS INC
COM
$89.5M171.0K5.3%
ADDED
+31.4K
4MIRUM PHARMACEUTICALS INC
COM
$74.9M811.3K4.4%
ADDED
+49.0K
5ARGENX SE
SPONSORED ADR
$71.9M98.5K4.2%
REDUCED
-4,750
6RHYTHM PHARMACEUTICALS INC
COM
$60.0M689.7K3.5%
REDUCED
-5,262
7INSMED INC
COM PAR $.01
$51.4M314.3K3.0%
REDUCED
-4,950
8ASCENDIS PHARMA A/S
SPONSORED ADR
$44.4M194.0K2.6%
REDUCED
-9,500
9XENON PHARMACEUTICALS INC
COM
$44.4M763.0K2.6%
REDUCED
-24,768
10TRAVERE THERAPEUTICS INC
COM
$43.9M1.48M2.6%
REDUCED
-732,368
11KYMERA THERAPEUTICS INC
COM
$41.4M496.9K2.4%
HELD
0
12PENUMBRA INC
COM
$39.6M120.5K2.3%
HELD
0
13INTUITIVE SURGICAL INC
COM NEW
$37.8M82.0K2.2%
HELD
0
14SCHOLAR ROCK HLDG CORP
COM
$36.4M739.8K2.1%
ADDED
+6.3K
15ENLIVEN THERAPEUTICS INC
COM
$32.4M826.5K1.9%
ADDED
+28.1K
16BOSTON SCIENTIFIC CORP
COM
$32.3M515.3K1.9%
ADDED
+116.3K
17IRHYTHM HOLDINGS INC
COM
$30.9M261.8K1.8%
ADDED
+26.8K
18STRUCTURE THERAPEUTICS INC
SPONSORED ADS
$30.9M640.2K1.8%
REDUCED
-108,019
19AGIOS PHARMACEUTICALS INC
COM
$27.0M799.2K1.6%
HELD
0
20ULTRAGENYX PHARMACEUTICAL IN
COM
$25.5M1.22M1.5%
REDUCED
-48,468
21ALNYLAM PHARMACEUTICALS INC
COM
$24.5M74.0K1.4%
ADDED
+2.8K
22COGENT BIOSCIENCES INC
COM
$24.0M624.2K1.4%
REDUCED
-224,875
23TENET HEALTHCARE CORP
COM NEW
$23.6M125.0K1.4%
HELD
0
24DEXCOM INC
COM
$22.3M355.6K1.3%
ADDED
+8.3K
25CELLDEX THERAPEUTICS INC NEW
COM NEW
$20.6M650.3K1.2%
REDUCED
-42,268
Showing top 25 of 109 positions

Filing History

Q1 2026100 pos
$1.7B
Q4 202599 pos
$2.0B

Data Source

Holdings data sourced from SEC EDGAR 13F-HR filings. Updated quarterly, approximately 45 days after quarter end. All data is public domain.

Last filed: May 15, 2026