Biogen Inc.

Historical 13F Holders

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

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Every filing for 09062X103 since 12/18/2024, newest first.

Filer % of Class Filed
FMR LLC 13G/A Amendment 3
12.4% 8/6/2026
Event 6/30/2026
FMR LLC 13G/A Amendment 2
11.3% 6/5/2026
Event 5/29/2026
FMR LLC 13G/A Amendment 1
8.7% 5/6/2026
Event 3/31/2026
Vanguard Capital Management LLC 13G 7.5% 4/29/2026
Event 3/31/2026
Vanguard Group Inc 13G/A Amendment 13 0% 3/26/2026
Event 3/13/2026
FMR LLC 13G
6.4% 2/5/2026
Event 12/31/2025
Primecap Management Co/CA/ 13G/A Amendment 27 10.2% 11/13/2025
Event 9/30/2025
State Street Corp 13G 5.0%
Checked 5% or less
11/10/2025
Event 9/30/2025
BlackRock, Inc. 13G/A Amendment 16 8.5% 4/17/2025
Event 3/31/2025

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q3 104 1.33 M $293 M
2026 Q2 1,114 190 M $33.4 B
2026 Q1 1,069 135 M $24.8 B
2025 Q4 1,067 141 M $24.8 B
2025 Q3 980 133 M $18.7 B
2025 Q2 929 132 M $16.6 B
2025 Q1 944 130 M $17.8 B
2024 Q4 950 133 M $20.3 B
2024 Q3 997 136 M $26.1 B
2024 Q2 1,015 135 M $31.4 B
2024 Q1 1,033 138 M $29.7 B
2023 Q4 1,077 137 M $35.5 B
2023 Q3 1,036 125 M $32.3 B
2023 Q2 1,069 127 M $36.2 B
2023 Q1 1,077 129 M $35.1 B
2022 Q4 1,109 132 M $36.8 B
2022 Q3 1,080 124 M $33.4 B
2022 Q2 1,009 123 M $25.3 B
2022 Q1 1,033 124 M $26.2 B
2021 Q4 1,108 125 M $30.3 B
2021 Q3 1,122 124 M $35.3 B
2021 Q2 1,201 127 M $43.8 B
2021 Q1 1,178 130 M $35.8 B
2020 Q4 1,161 132 M $32.4 B
2020 Q3 1,140 132 M $37.5 B
2020 Q2 1,138 137 M $36.5 B
2020 Q1 1,191 146 M $46.2 B
2019 Q4 1,193 157 M $46.5 B
2019 Q3 1,070 161 M $37.6 B
2019 Q2 1,105 164 M $38.4 B
2019 Q1 1,178 172 M $40.8 B
2018 Q4 1,219 180 M $54.1 B
2018 Q3 1,235 184 M $64.9 B
2018 Q2 1,181 182 M $52.8 B
2018 Q1 1,187 192 M $52.5 B
2017 Q4 1,205 191 M $60.6 B
2017 Q3 1,097 189 M $59.2 B
2017 Q2 1,068 188 M $50.9 B
2017 Q1 1,091 190 M $51.9 B
2016 Q4 1,125 191 M $54.1 B
2016 Q3 1,110 192 M $60.1 B
2016 Q2 1,047 193 M $46.7 B
2016 Q1 1,025 205 M $49.9 B
2015 Q4 1,050 196 M $60.3 B
2015 Q3 990 202 M $59.1 B
2015 Q2 1,038 212 M $85.5 B
2015 Q1 1,035 214 M $90.3 B
2014 Q4 958 215 M $73.3 B
2014 Q3 882 215 M $71.1 B
2014 Q2 849 220 M $69.5 B
2014 Q1 840 216 M $66.0 B