BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Asset Management One Co., Ltd.'s Holding History (CIK: 0001068855)

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

Q4 2025

Shares 67,453 Value ($000) $11,927 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 67,907 Value ($000) $9,512 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 62,810 Value ($000) $7,888 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 61,420 Value ($000) $8,405 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 58,226 Value ($000) $8,810 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 55,355 Value ($000) $10,730 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 55,031 Value ($000) $12,757 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 58,910 Value ($000) $12,703 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 61,257 Value ($000) $15,962 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 63,643 Value ($000) $16,357 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 59,855 Value ($000) $17,050 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 58,357 Value ($000) $16,225 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 58,330 Value ($000) $16,101 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 61,340 Value ($000) $16,377 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 62,567 Value ($000) $12,759 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 63,007 Value ($000) $13,269 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 66,641 Value ($000) $17,169 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 68,019 Value ($000) $19,248 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 70,814 Value ($000) $24,520 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 72,260 Value ($000) $20,214 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 80,165 Value ($000) $19,520 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 86,192 Value ($000) $24,453 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 93,583 Value ($000) $25,036 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 96,638 Value ($000) $30,574 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 111,582 Value ($000) $33,110 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 122,513 Value ($000) $28,523 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 111,205 Value ($000) $26,007 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 103,162 Value ($000) $24,387 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 334,127 Value ($000) $100,398 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 343,898 Value ($000) $121,547 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 347,152 Value ($000) $100,718 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 365,671 Value ($000) $100,128 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 356,893 Value ($000) $113,725 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 362,566 Value ($000) $113,472 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 367,361 Value ($000) $99,696 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 360,312 Value ($000) $98,442 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 370,669 Value ($000) $105,213 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 66,893 Value ($000) $20,522 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 79,347 Value ($000) $18,990 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 93,075 Value ($000) $23,755 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 100,744 Value ($000) $31,139 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 97,261 Value ($000) $27,124 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 103,409 Value ($000) $41,008 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 112,866 Value ($000) $48,650 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 108,625 Value ($000) $37,289 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 81,813 Value ($000) $27,014 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 37,046 Value ($000) $11,774 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 40,029 Value ($000) $11,819 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 43,714 Value ($000) $12,155 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 35,682 Value ($000) $8,716 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 58,362 Value ($000) $12,345 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	67,453	$11,927	$163.37	$138.00 - $185.17
Q3 2025	67,907	$9,512	$135.17	$121.05 - $150.28
Q2 2025	62,810	$7,888	$124.60	$110.04 - $137.32
Q1 2025	61,420	$8,405	$142.96	$128.51 - $157.09
Q4 2024	58,226	$8,810	$168.67	$145.07 - $195.00
Q3 2024	55,355	$10,730	$209.21	$188.78 - $238.00
Q2 2024	55,031	$12,757	$217.32	$189.44 - $237.54
Q1 2024	58,910	$12,703	$234.20	$211.02 - $268.30
Q4 2023	61,257	$15,962	$245.62	$220.86 - $269.43
Q3 2023	63,643	$16,357	$267.47	$251.85 - $287.60
Q2 2023	59,855	$17,050	$297.86	$273.39 - $319.76
Q1 2023	58,357	$16,225	$276.70	$254.80 - $295.90
Q4 2022	58,330	$16,101	$282.44	$250.31 - $311.88
Q3 2022	61,340	$16,377	$212.38	$193.65 - $283.44
Q2 2022	62,567	$12,759	$204.43	$187.16 - $225.50
Q1 2022	63,007	$13,269	$217.46	$192.67 - $249.00
Q4 2021	66,641	$17,169	$257.12	$221.72 - $290.76
Q3 2021	68,019	$19,248	$327.75	$282.64 - $372.12
Q2 2021	70,814	$24,520	$302.94	$257.03 - $468.55
Q1 2021	72,260	$20,214	$269.69	$238.40 - $296.38
Q4 2020	80,165	$19,520	$259.08	$223.25 - $363.92
Q3 2020	86,192	$24,453	$278.91	$261.87 - $312.00
Q2 2020	93,583	$25,036	$300.59	$257.60 - $350.24
Q1 2020	96,638	$30,574	$303.47	$262.25 - $374.99
Q4 2019	111,582	$33,110	$277.46	$219.70 - $318.00
Q3 2019	122,513	$28,523	$232.85	$215.78 - $246.99
Q2 2019	111,205	$26,007	$230.90	$219.20 - $245.35
Q1 2019	103,162	$24,387	$314.89	$216.12 - $344.00
Q4 2018	334,127	$100,398	$319.14	$278.46 - $358.41
Q3 2018	343,898	$121,547	$344.30	$288.13 - $388.67
Q2 2018	347,152	$100,718	$281.15	$249.17 - $310.91
Q1 2018	365,671	$100,128	$310.41	$259.76 - $370.57
Q4 2017	356,893	$113,725	$320.80	$301.81 - $348.84
Q3 2017	362,566	$113,472	$296.11	$269.50 - $330.00
Q2 2017	367,361	$99,696	$264.42	$244.28 - $291.90
Q1 2017	360,312	$98,442	$282.75	$260.50 - $301.42
Q4 2016	370,669	$105,213	$296.43	$268.00 - $329.83
Q3 2016	66,893	$20,522	$296.18	$240.07 - $333.65
Q2 2016	79,347	$18,990	$263.54	$223.02 - $292.69
Q1 2016	93,075	$23,755	$264.15	$242.07 - $301.02
Q4 2015	100,744	$31,139	$287.35	$254.00 - $311.65
Q3 2015	97,261	$27,124	$330.23	$265.00 - $412.24
Q2 2015	103,409	$41,008	$401.33	$368.88 - $432.88
Q1 2015	112,866	$48,650	$394.14	$334.40 - $480.18
Q4 2014	108,625	$37,289	$323.51	$290.85 - $361.93
Q3 2014	81,813	$27,014	$329.72	$298.31 - $349.00
Q2 2014	37,046	$11,774	$300.97	$272.02 - $322.25
Q1 2014	40,029	$11,819	$317.43	$270.62 - $358.89
Q4 2013	43,714	$12,155	$258.65	$221.07 - $298.82
Q3 2013	35,682	$8,716	$223.81	$203.55 - $248.95
Q2 2013	58,362	$12,345	$213.68	$191.80 - $242.64