SEC 13F Intelligence

Rock Springs Capital Management LP / BIIB

Rock Springs Capital Management LP’s Biogen Inc Position

Does Rock Springs Capital Management LP own Biogen Inc (BIIB)? Not currently — the last reported position was 113.5K shares worth $39M in Q2 2021; the fund’s latest 13F (Q1 2026) no longer reports it.

Position Value
$39M
Q2 2021
Shares
113.5K
% of Portfolio
+0.78%
Quarters Held
7
position exited

Position History BIIB

Reported value by quarter
Q4 ’18: $15MQ4 ’18Q1 ’20: $57MQ1 ’20Q2 ’20: $48MQ2 ’20Q3 ’20: $49MQ3 ’20Q4 ’20: $24MQ4 ’20Q1 ’21: $32MQ1 ’21Q2 ’21: $39MQ2 ’21filingsflow.com
QuarterSharesValue% of Portfolio
Q2 2021113.5K$39M+0.78%
Q1 2021113.5K$32M+0.69%
Q4 2020100.0K$24M+0.52%
Q3 2020172.5K$49M+1.24%
Q2 2020180.0K$48M+1.32%
Q1 2020180.0K$57M+2.35%
Q4 201850.0K$15M+0.71%

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 BIIB.