Biogen Inc.

Historical 13F Holders

Symbol
BIIB
CUSIP
09062X103
All holders as of
Q2 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Shares Held, Excluding Options
Total Filers

13D/G Filers

Each filer's latest filing for 09062X103 since 12/18/2024, largest first.

Filer % of Class Filed
FMR LLC 13G/A
12.4% 8/6/2026
Event 6/30/2026
Primecap Management Co/CA/ 13G/A 10.2% 11/13/2025
Event 9/30/2025
BlackRock, Inc. 13G/A 8.5% 4/17/2025
Event 3/31/2025
Vanguard Capital Management LLC 13G 7.5% 4/29/2026
Event 3/31/2026
State Street Corp 13G 5.1% 11/10/2026
Event 9/30/2026
Under 5%, checked the "5 percent or less" box, or amended by a later filing (1)
Vanguard Group Inc 13G/A 0% 3/26/2026
Event 3/13/2026

13F Holders by Quarter

Period Filers Shares, Excl. Options Value, Excl. Options
2026 Q3 644 42.9 M $9.68B
2026 Q2 1,059 142 M $33.2B
2026 Q1 1,024 135 M $24.8B
2025 Q4 1,015 141 M $24.7B
2025 Q3 922 131 M $18.5B
2025 Q2 874 130 M $16.3B
2025 Q1 890 130 M $17.8B
2024 Q4 885 132 M $20.2B
2024 Q3 929 130 M $25.1B
2024 Q2 958 129 M $29.9B
2024 Q1 962 130 M $28.0B
2023 Q4 1,013 129 M $33.3B
2023 Q3 970 125 M $32.1B
2023 Q2 1,011 127 M $36.1B
2023 Q1 1,010 128 M $35.0B
2022 Q4 1,038 125 M $34.8B
2022 Q3 997 124 M $33.3B
2022 Q2 938 123 M $25.3B
2022 Q1 958 123 M $26.1B
2021 Q4 1,019 124 M $30.0B
2021 Q3 1,048 124 M $35.3B
2021 Q2 1,116 126 M $43.7B
2021 Q1 1,102 130 M $35.8B
2020 Q4 1,074 129 M $31.8B
2020 Q3 1,062 131 M $37.3B
2020 Q2 1,063 136 M $36.3B
2020 Q1 1,112 145 M $45.8B
2019 Q4 1,109 152 M $45.1B
2019 Q3 993 160 M $37.3B
2019 Q2 1,016 162 M $37.8B
2019 Q1 1,100 172 M $40.7B
2018 Q4 1,144 176 M $52.8B
2018 Q3 1,154 179 M $63.2B
2018 Q2 1,105 180 M $52.3B
2018 Q1 1,106 188 M $51.4B
2017 Q4 1,133 189 M $60.0B
2017 Q3 1,028 189 M $59.1B
2017 Q2 1,002 188 M $50.9B
2017 Q1 1,026 188 M $51.5B
2016 Q4 1,036 190 M $53.8B
2016 Q3 1,025 192 M $60.1B
2016 Q2 977 191 M $46.4B
2016 Q1 953 205 M $49.9B
2015 Q4 979 194 M $59.6B
2015 Q3 928 200 M $58.5B
2015 Q2 981 212 M $85.4B
2015 Q1 976 214 M $90.3B
2014 Q4 897 214 M $72.8B
2014 Q3 822 215 M $71.0B
2014 Q2 791 215 M $67.8B
2014 Q1 781 216 M $66.0B