SEC 13F Intelligence

Rock Springs Capital Management LP / ZLAB

Rock Springs Capital Management LP’s Zai Lab Ltd Position

Does Rock Springs Capital Management LP own Zai Lab Ltd (ZLAB)? Yes — 814.7K shares worth $15M (+0.90% of its 13F portfolio) as of Q1 2026, up from 811.5K shares the prior filed quarter.

Position Value
$15M
Q1 2026
Shares
814.7K
% of Portfolio
+0.90%
Quarters Held
30
currently held

Position History ZLAB

Reported value by quarter
Q4 ’18: $8MQ4 ’18Q1 ’19: $12MQ2 ’19: $19MQ3 ’19: $19MQ4 ’19: $26MQ4 ’19Q1 ’20: $39MQ2 ’20: $67MQ3 ’20: $68MQ4 ’20: $116MQ4 ’20Q1 ’21: $125MQ2 ’21: $179MQ3 ’21: $114MQ4 ’21: $74MQ4 ’21Q1 ’22: $53MQ2 ’22: $42MQ3 ’22: $41MQ4 ’22: $33MQ4 ’22Q1 ’23: $35MQ2 ’23: $34MQ3 ’23: $30MQ4 ’23: $31MQ4 ’23Q1 ’24: $21MQ2 ’24: $22MQ3 ’24: $32MQ4 ’24: $34MQ4 ’24Q1 ’25: $33MQ2 ’25: $30MQ3 ’25: $27MQ4 ’25: $14MQ4 ’25Q1 ’26: $15Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 2026814.7K$15M+0.90%
Q4 2025811.5K$14M+0.73%
Q3 2025791.2K$27M+1.57%
Q2 2025871.4K$30M+1.90%
Q1 2025904.6K$33M+1.87%
Q4 20241.31M$34M+1.30%
Q3 20241.32M$32M+1.03%
Q2 20241.30M$22M+0.68%
Q1 20241.30M$21M+0.53%
Q4 20231.14M$31M+0.76%
Q3 20231.24M$30M+0.81%
Q2 20231.22M$34M+0.81%
Q1 20231.06M$35M+0.84%
Q4 20221.06M$33M+0.78%
Q3 20221.19M$41M+1.05%
Q2 20221.22M$42M+1.23%
Q1 20221.21M$53M+1.34%
Q4 20211.18M$74M+1.71%
Q3 20211.08M$114M+2.39%
Q2 20211.01M$179M+3.55%
Q1 2021933.5K$125M+2.72%
Q4 2020854.9K$116M+2.45%
Q3 2020823.5K$68M+1.74%
Q2 2020813.2K$67M+1.83%
Q1 2020750.0K$39M+1.60%
Q4 2019625.0K$26M+0.82%
Q3 2019575.0K$19M+0.74%
Q2 2019550.0K$19M+0.69%
Q1 2019413.4K$12M+0.47%
Q4 2018350.0K$8M+0.38%

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 ZLAB.