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Filers›Asset Manager›Rock Springs Capital Management LP
DOSSIER · 13F-HR · Q1 2026

Rock Springs Capital Management LP

Rock Springs's asset manager based in Omaha, NE — $1.7B in tracked AUM across 100 positions as of Q1 2026.

RS
Rock Springs·Omaha, NE·Asset Manager
CIK 0001595725 · last filed Mar 31, 2026
Total AUM
$1.7B
▲ 0.5%
vs prior
Holdings
100
—
positions
Whale Score
65
65
tracked
Activity
—
no data
changes this Q
Top sector
Tech
12% weight
concentration
AI Analysis · Q1 2026 · Q1 2026

Portfolio Overview

Rock Springs Capital Management LP reported a significant contraction in portfolio value for the quarter ending September 30, 2025. The total assets under management (AUM) decreased by 31.9%, dropping from $1.60 billion to $1.09 billion. This reduction is attributed not only to potential market depreciation but also to substantial capital reallocation, evidenced by the high volume of portfolio turnover. The firm currently holds 62 positions, maintaining a concentrated str...

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
RVMD
REVOLUTION MEDICINES INC
$118M1.2M6.9%
02
LLY
ELI LILLY & CO
$91M99K5.4%
03
MDGL
MADRIGAL PHARMACEUTICALS INC
$90M171K5.3%
04
MIRM
MIRUM PHARMACEUTICALS INC
$75M811K4.4%
05
ARGX
ARGENX SE
$72M99K4.2%
06
RYTM
RHYTHM PHARMACEUTICALS INC
$60M690K3.5%
07
INSM
INSMED INC
$51M314K3.0%
08
ASND
ASCENDIS PHARMA A/S
$44M194K2.6%
09
XENE
XENON PHARMACEUTICALS INC
$44M763K2.6%
10
TVTX
TRAVERE THERAPEUTICS INC
$44M1.5M2.6%

Filing history

Filing history loading…
AI Agent · grounded in Rock
haiku-4-5 · 100 positions indexed
Sector mix
  • Tech12%
  • Financials28%
  • Health Care7%
  • Communications13%
  • Industrials4%
  • Other36%
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