SEC 13F Intelligence

Avidity Partners Management LP / BIIB

Avidity Partners Management LP’s Biogen Inc Position

Does Avidity Partners Management LP own Biogen Inc (BIIB)? Not currently — the last reported position was 115.4K shares worth $30M in Q3 2023; the fund’s latest 13F (Q1 2026) no longer reports it.

Position Value
$30M
Q3 2023
Shares
115.4K
% of Portfolio
+1.19%
Quarters Held
8
position exited

Position History BIIB

Reported value by quarter
Q3 ’20: $89MQ3 ’20Q2 ’21: $64MQ2 ’21Q1 ’22: $77MQ1 ’22Q2 ’22: $90MQ2 ’22Q3 ’22: $160MQ3 ’22Q1 ’23: $36MQ1 ’23Q2 ’23: $50MQ2 ’23Q3 ’23: $30MQ3 ’23filingsflow.com
QuarterSharesValue% of Portfolio
Q3 2023115.4K$30M+1.19%
Q2 2023174.0K$50M+1.73%
Q1 2023128.8K$36M+1.19%
Q3 2022600.0K$160M+3.26%
Q2 2022440.6K$90M+2.06%
Q1 2022365.0K$77M+1.60%
Q2 2021183.9K$64M+1.72%
Q3 2020315.1K$89M+4.15%

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