BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

NOMURA ASSET MANAGEMENT CO LTD's Holding History (CIK: 0001055964)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 67,351 Value ($000) $11,853 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 67,369 Value ($000) $9,437 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 54,341 Value ($000) $6,825 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 53,786 Value ($000) $7,360 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 49,092 Value ($000) $7,507 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 49,303 Value ($000) $9,557 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 56,093 Value ($000) $13,003 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 70,044 Value ($000) $15,104 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 71,695 Value ($000) $18,553 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 70,200 Value ($000) $18,042 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 78,082 Value ($000) $22,242 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 61,247 Value ($000) $17,029 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 61,471 Value ($000) $17,023 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 40,788 Value ($000) $10,890 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 42,466 Value ($000) $8,661 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 39,798 Value ($000) $8,381 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 41,396 Value ($000) $9,932 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 49,239 Value ($000) $13,934 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 53,761 Value ($000) $18,616 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 148,035 Value ($000) $41,413 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 143,715 Value ($000) $35,190 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 148,464 Value ($000) $42,115 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 149,703 Value ($000) $40,053 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 67,567 Value ($000) $21,377 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 64,902 Value ($000) $19,258 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 61,112 Value ($000) $14,228 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 62,198 Value ($000) $14,546 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 59,540 Value ($000) $14,075 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 139,687 Value ($000) $42,035 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 223,434 Value ($000) $78,941 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 231,071 Value ($000) $67,066 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 233,841 Value ($000) $64,030 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 226,120 Value ($000) $72,035 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 194,476 Value ($000) $60,895 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 66,026 Value ($000) $17,917 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 65,048 Value ($000) $17,784 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 65,778 Value ($000) $18,657 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 64,465 Value ($000) $20,179 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 64,899 Value ($000) $15,694 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 65,963 Value ($000) $17,171 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 48,295 Value ($000) $14,795 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 49,836 Value ($000) $14,543 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 42,156 Value ($000) $17,028 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 33,767 Value ($000) $14,258 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 32,811 Value ($000) $11,227 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 33,689 Value ($000) $11,145 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 31,777 Value ($000) $10,020 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 40,287 Value ($000) $12,322 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 32,714 Value ($000) $9,146 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 33,086 Value ($000) $7,966 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 38,684 Value ($000) $8,325 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	67,351	$11,853	$163.37	$138.00 - $185.17
Q3 2025	67,369	$9,437	$135.17	$121.05 - $150.28
Q2 2025	54,341	$6,825	$124.60	$110.04 - $137.32
Q1 2025	53,786	$7,360	$142.96	$128.51 - $157.09
Q4 2024	49,092	$7,507	$168.67	$145.07 - $195.00
Q3 2024	49,303	$9,557	$209.21	$188.78 - $238.00
Q2 2024	56,093	$13,003	$217.32	$189.44 - $237.54
Q1 2024	70,044	$15,104	$234.20	$211.02 - $268.30
Q4 2023	71,695	$18,553	$245.62	$220.86 - $269.43
Q3 2023	70,200	$18,042	$267.47	$251.85 - $287.60
Q2 2023	78,082	$22,242	$297.86	$273.39 - $319.76
Q1 2023	61,247	$17,029	$276.70	$254.80 - $295.90
Q4 2022	61,471	$17,023	$282.44	$250.31 - $311.88
Q3 2022	40,788	$10,890	$212.38	$193.65 - $283.44
Q2 2022	42,466	$8,661	$204.43	$187.16 - $225.50
Q1 2022	39,798	$8,381	$217.46	$192.67 - $249.00
Q4 2021	41,396	$9,932	$257.12	$221.72 - $290.76
Q3 2021	49,239	$13,934	$327.75	$282.64 - $372.12
Q2 2021	53,761	$18,616	$302.94	$257.03 - $468.55
Q1 2021	148,035	$41,413	$269.69	$238.40 - $296.38
Q4 2020	143,715	$35,190	$259.08	$223.25 - $363.92
Q3 2020	148,464	$42,115	$278.91	$261.87 - $312.00
Q2 2020	149,703	$40,053	$300.59	$257.60 - $350.24
Q1 2020	67,567	$21,377	$303.47	$262.25 - $374.99
Q4 2019	64,902	$19,258	$277.46	$219.70 - $318.00
Q3 2019	61,112	$14,228	$232.85	$215.78 - $246.99
Q2 2019	62,198	$14,546	$230.90	$219.20 - $245.35
Q1 2019	59,540	$14,075	$314.89	$216.12 - $344.00
Q4 2018	139,687	$42,035	$319.14	$278.46 - $358.41
Q3 2018	223,434	$78,941	$344.30	$288.13 - $388.67
Q2 2018	231,071	$67,066	$281.15	$249.17 - $310.91
Q1 2018	233,841	$64,030	$310.41	$259.76 - $370.57
Q4 2017	226,120	$72,035	$320.80	$301.81 - $348.84
Q3 2017	194,476	$60,895	$296.11	$269.50 - $330.00
Q2 2017	66,026	$17,917	$264.42	$244.28 - $291.90
Q1 2017	65,048	$17,784	$282.75	$260.50 - $301.42
Q4 2016	65,778	$18,657	$296.43	$268.00 - $329.83
Q3 2016	64,465	$20,179	$296.18	$240.07 - $333.65
Q2 2016	64,899	$15,694	$263.54	$223.02 - $292.69
Q1 2016	65,963	$17,171	$264.15	$242.07 - $301.02
Q4 2015	48,295	$14,795	$287.35	$254.00 - $311.65
Q3 2015	49,836	$14,543	$330.23	$265.00 - $412.24
Q2 2015	42,156	$17,028	$401.33	$368.88 - $432.88
Q1 2015	33,767	$14,258	$394.14	$334.40 - $480.18
Q4 2014	32,811	$11,227	$323.51	$290.85 - $361.93
Q3 2014	33,689	$11,145	$329.72	$298.31 - $349.00
Q2 2014	31,777	$10,020	$300.97	$272.02 - $322.25
Q1 2014	40,287	$12,322	$317.43	$270.62 - $358.89
Q4 2013	32,714	$9,146	$258.65	$221.07 - $298.82
Q3 2013	33,086	$7,966	$223.81	$203.55 - $248.95
Q2 2013	38,684	$8,325	$213.68	$191.80 - $242.64