Biogen Inc.

Asset Management One Co., Ltd. BIIB

Report date

12/31/2025

Quarter

2025 Q4

Filed

1/27/2026

Shares

67,453

Value ($000)

11,927

Weight

0.0%

2013 Q2 - 2025 Q4 (29 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	1/27/2026	11,927	0.0%	67,453	12/31/2025
2025 Q3	10/22/2025	9,512	0.0%	67,907	9/30/2025
2025 Q2	7/31/2025	7,888	0.0%	62,810	6/30/2025
2025 Q1	4/23/2025	8,405	0.0%	61,420	3/31/2025
2024 Q4	1/30/2025	8,810	0.0%	58,226	12/31/2024
2024 Q3	10/30/2024	10,730	0.0%	55,355	9/30/2024
2024 Q2	7/18/2024	12,757	0.0%	55,031	6/30/2024
2024 Q1	5/2/2024	12,703	0.0%	58,910	3/31/2024
2023 Q4	1/24/2024	15,962	0.1%	61,257	12/31/2023
2023 Q3	10/19/2023	16,357	0.1%	63,643	9/30/2023
2023 Q2	7/31/2023	17,050	0.1%	59,855	6/30/2023
2023 Q1	4/25/2023	16,225	0.1%	58,357	3/31/2023
2022 Q4	2/6/2023	16,101	0.1%	58,330	12/31/2022
2022 Q3	11/4/2022	16,377	0.1%	61,340	9/30/2022
2022 Q2	7/29/2022	12,759	0.1%	62,567	6/30/2022
2022 Q1	5/13/2022	13,269	0.1%	63,007	3/31/2022
2021 Q4	2/9/2022	17,169	0.1%	66,641	12/31/2021
2021 Q3	11/2/2021	19,248	0.1%	68,019	9/30/2021
2021 Q2	8/3/2021	24,520	0.1%	70,814	6/30/2021
2021 Q1	5/14/2021	20,214	0.1%	72,260	3/31/2021
2020 Q4	2/12/2021	19,520	0.1%	80,165	12/31/2020
2020 Q3	11/13/2020	24,453	0.1%	86,192	9/30/2020
2020 Q2	8/14/2020	25,036	0.1%	93,583	6/30/2020
2020 Q1	5/14/2020	30,574	0.2%	96,638	3/31/2020
2019 Q4	2/14/2020	33,110	0.1%	111,582	12/31/2019
2014 Q1	5/5/2014	11,819	0.2%	40,029	3/31/2014
2013 Q4	2/5/2014	12,155	0.2%	43,714	12/31/2013
2013 Q3	2/5/2014	8,716	0.1%	35,682	9/30/2013
2013 Q2	2/12/2014	12,345	0.2%	58,362	6/30/2013