SEC 13F Intelligence

Illinois Municipal Retirement Fund / BIIB

Illinois Municipal Retirement Fund’s Biogen Inc Position

Does Illinois Municipal Retirement Fund own Biogen Inc (BIIB)? Yes — 89.3K shares worth $16M (+0.21% of its 13F portfolio) as of Q1 2026, up from 81.4K shares the prior filed quarter.

Position Value
$16M
Q1 2026
Shares
89.3K
% of Portfolio
+0.21%
Quarters Held
24
currently held

Position History BIIB

Reported value by quarter
Q2 ’20: $1MQ2 ’20Q3 ’20: $3MQ4 ’20: $5MQ1 ’21: $6MQ1 ’21Q2 ’21: $11MQ3 ’21: $10MQ4 ’21: $10MQ4 ’21Q1 ’22: $10MQ2 ’22: $13MQ3 ’22: $19MQ3 ’22Q4 ’22: $17,808Q1 ’23: $15,679Q2 ’23: $17,119Q2 ’23Q3 ’23: $17,577Q4 ’23: $12,710Q1 ’24: $10,591Q1 ’24Q2 ’24: $10MQ3 ’24: $10MQ4 ’24: $10MQ4 ’24Q1 ’25: $9MQ2 ’25: $13MQ3 ’25: $12MQ3 ’25Q4 ’25: $14MQ1 ’26: $16Mfilingsflow.com
QuarterSharesValue% of Portfolio
Q1 202689.3K$16M+0.21%
Q4 202581.4K$14M+0.18%
Q3 202583.1K$12M+0.15%
Q2 2025106.9K$13M+0.18%
Q1 202564.1K$9M+0.13%
Q4 202462.2K$10M+0.13%
Q3 202450.0K$10M+0.14%
Q2 202442.0K$10M+0.15%
Q1 202449.1K$10,591+0.16%
Q4 202349.1K$12,710+0.21%
Q3 202368.4K$17,577+0.33%
Q2 202360.1K$17,119+0.34%
Q1 202356.4K$15,679+0.33%
Q4 202264.3K$17,808+0.40%
Q3 202269.6K$19M+0.46%
Q2 202263.7K$13M+0.30%
Q1 202245.5K$10M+0.28%
Q4 202143.3K$10M+0.29%
Q3 202136.1K$10M+0.38%
Q2 202130.9K$11M+0.43%
Q1 202122.9K$6M+0.28%
Q4 202022.3K$5M+0.26%
Q3 202010.4K$3M+0.39%
Q2 20205.6K$1M+0.62%

Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Illinois Municipal Retirement Fund’s full portfolio or all institutional holders of BIIB.