SEC 13F Intelligence

Rock Springs Capital Management LP / ARGX

Rock Springs Capital Management LP’s Argenx SE Position

Does Rock Springs Capital Management LP own Argenx SE (ARGX)? Yes — 98.5K shares worth $72M (+4.24% of its 13F portfolio) as of Q1 2026, down from 103.3K shares the prior filed quarter.

Position Value
$72M
Q1 2026
Shares
98.5K
% of Portfolio
+4.24%
Quarters Held
30
currently held

Position History ARGX

Reported value by quarter
Q4 ’18: $17MQ4 ’18Q1 ’19: $23MQ2 ’19: $26MQ3 ’19: $21MQ4 ’19: $40MQ4 ’19Q1 ’20: $33MQ2 ’20: $65MQ3 ’20: $75MQ4 ’20: $85MQ4 ’20Q1 ’21: $83MQ2 ’21: $95MQ3 ’21: $95MQ4 ’21: $110MQ4 ’21Q1 ’22: $110MQ2 ’22: $133MQ3 ’22: $124MQ4 ’22: $133MQ4 ’22Q1 ’23: $130MQ2 ’23: $136MQ3 ’23: $127MQ4 ’23: $87MQ4 ’23Q1 ’24: $90MQ2 ’24: $99MQ3 ’24: $127MQ4 ’24: $141MQ4 ’24Q1 ’25: $104MQ2 ’25: $97MQ3 ’25: $105MQ4 ’25: $87MQ4 ’25Q1 ’26: $72Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 202698.5K$72M+4.24%
Q4 2025103.3K$87M+4.45%
Q3 2025142.8K$105M+6.15%
Q2 2025175.8K$97M+6.04%
Q1 2025175.8K$104M+5.95%
Q4 2024229.6K$141M+5.38%
Q3 2024233.5K$127M+4.12%
Q2 2024229.3K$99M+2.97%
Q1 2024229.3K$90M+2.29%
Q4 2023229.3K$87M+2.15%
Q3 2023259.0K$127M+3.41%
Q2 2023350.0K$136M+3.25%
Q1 2023350.0K$130M+3.11%
Q4 2022350.0K$133M+3.19%
Q3 2022350.0K$124M+3.19%
Q2 2022350.0K$133M+3.86%
Q1 2022350.0K$110M+2.78%
Q4 2021315.0K$110M+2.55%
Q3 2021315.0K$95M+2.00%
Q2 2021315.0K$95M+1.87%
Q1 2021300.0K$83M+1.80%
Q4 2020287.5K$85M+1.79%
Q3 2020287.5K$75M+1.92%
Q2 2020287.5K$65M+1.78%
Q1 2020247.5K$33M+1.35%
Q4 2019247.5K$40M+1.26%
Q3 2019181.7K$21M+0.83%
Q2 2019181.7K$26M+0.93%
Q1 2019181.7K$23M+0.87%
Q4 2018178.0K$17M+0.81%

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 ARGX.