Biogen Inc.

VANGUARD GROUP INC BIIB

Report date

12/31/2025

Quarter

2025 Q4

Filed

1/29/2026

Shares

17,447,092

Value ($000)

3,070,514

Weight

0.0%

2013 Q4 - 2025 Q4 (28 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2025 Q4	1/29/2026	3,070,514	0.0%	17,447,092	12/31/2025
2025 Q3	11/7/2025	2,421,876	0.0%	17,289,235	9/30/2025
2025 Q2	8/11/2025	2,171,533	0.0%	17,290,651	6/30/2025
2025 Q1	5/9/2025	2,330,774	0.0%	17,032,839	3/31/2025
2024 Q4	2/11/2025	2,561,238	0.0%	16,748,875	12/31/2024
2024 Q3	11/13/2024	3,232,962	0.1%	16,678,507	9/30/2024
2024 Q2	8/13/2024	3,848,250	0.1%	16,600,163	6/30/2024
2024 Q1	5/10/2024	3,573,075	0.1%	16,570,398	3/31/2024
2023 Q4	3/11/2024	3,728,185	0.1%	14,407,330	12/31/2023
2023 Q3	12/18/2023	3,132,588	0.1%	12,188,586	9/30/2023
2023 Q2	8/14/2023	3,474,155	0.1%	12,196,436	6/30/2023
2023 Q1	7/14/2023	3,380,195	0.1%	12,157,662	3/31/2023
2022 Q4	2/10/2023	3,316,566	0.1%	11,976,623	12/31/2022
2022 Q3	11/14/2022	3,181,298	0.1%	11,914,973	9/30/2022
2022 Q2	8/12/2022	2,418,733	0.1%	11,860,022	6/30/2022
2022 Q1	5/13/2022	2,468,356	0.1%	11,720,584	3/31/2022
2021 Q4	2/14/2022	2,768,029	0.1%	11,537,299	12/31/2021
2021 Q3	11/12/2021	3,308,684	0.1%	11,691,876	9/30/2021
2021 Q2	8/13/2021	4,069,827	0.1%	11,753,333	6/30/2021
2021 Q1	5/14/2021	3,316,059	0.1%	11,853,658	3/31/2021
2020 Q4	2/12/2021	2,912,979	0.1%	11,896,510	12/31/2020
2020 Q3	11/16/2020	3,502,903	0.1%	12,348,072	9/30/2020
2020 Q2	8/14/2020	3,445,001	0.1%	12,876,107	6/30/2020
2020 Q1	5/15/2020	4,504,690	0.2%	14,238,227	3/31/2020
2019 Q4	2/14/2020	4,115,804	0.1%	13,870,538	12/31/2019
2014 Q2	8/11/2014	3,810,930	0.3%	12,086,297	6/30/2014
2014 Q1	5/13/2014	3,639,587	0.3%	11,899,130	3/31/2014
2013 Q4	2/12/2014	3,251,707	0.3%	11,623,653	12/31/2013