SEC 13F Intelligence

Rock Springs Capital Management LP / RYTM

Rock Springs Capital Management LP’s Rhythm Pharmaceuticals Inc Position

Does Rock Springs Capital Management LP own Rhythm Pharmaceuticals Inc (RYTM)? Yes — 689.7K shares worth $60M (+3.54% of its 13F portfolio) as of Q1 2026, down from 695.0K shares the prior filed quarter.

Position Value
$60M
Q1 2026
Shares
689.7K
% of Portfolio
+3.54%
Quarters Held
30
currently held

Position History RYTM

Reported value by quarter
Q4 ’18: $6MQ4 ’18Q1 ’19: $6MQ2 ’19: $5MQ3 ’19: $7MQ4 ’19: $8MQ4 ’19Q1 ’20: $8MQ2 ’20: $11MQ3 ’20: $10MQ4 ’20: $15MQ4 ’20Q1 ’21: $13MQ2 ’21: $12MQ3 ’21: $8MQ4 ’21: $6MQ4 ’21Q1 ’22: $14MQ2 ’22: $6MQ3 ’22: $43MQ4 ’22: $51MQ4 ’22Q1 ’23: $28MQ2 ’23: $26MQ3 ’23: $37MQ4 ’23: $70MQ4 ’23Q1 ’24: $66MQ2 ’24: $53MQ3 ’24: $64MQ4 ’24: $65MQ4 ’24Q1 ’25: $44MQ2 ’25: $54MQ3 ’25: $72MQ4 ’25: $74MQ4 ’25Q1 ’26: $60Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 2026689.7K$60M+3.54%
Q4 2025695.0K$74M+3.81%
Q3 2025717.1K$72M+4.23%
Q2 2025861.2K$54M+3.39%
Q1 2025834.2K$44M+2.53%
Q4 20241.16M$65M+2.48%
Q3 20241.23M$64M+2.09%
Q2 20241.28M$53M+1.58%
Q1 20241.52M$66M+1.68%
Q4 20231.52M$70M+1.72%
Q3 20231.60M$37M+0.98%
Q2 20231.60M$26M+0.63%
Q1 20231.60M$28M+0.68%
Q4 20221.76M$51M+1.23%
Q3 20221.76M$43M+1.11%
Q2 20221.40M$6M+0.17%
Q1 20221.24M$14M+0.36%
Q4 2021627.2K$6M+0.14%
Q3 2021612.2K$8M+0.17%
Q2 2021606.3K$12M+0.23%
Q1 2021599.3K$13M+0.28%
Q4 2020490.3K$15M+0.31%
Q3 2020464.1K$10M+0.26%
Q2 2020512.1K$11M+0.31%
Q1 2020500.0K$8M+0.31%
Q4 2019345.0K$8M+0.25%
Q3 2019305.0K$7M+0.26%
Q2 2019235.0K$5M+0.19%
Q1 2019216.5K$6M+0.23%
Q4 2018216.5K$6M+0.27%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Rock Springs Capital Management LP’s full portfolio or all institutional holders of RYTM.