BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

JANUS HENDERSON GROUP PLC's Holding History (CIK: 0001274173)

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

Q4 2025

Shares 20,252 Value ($000) $3,564 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 18,260 Value ($000) $2,558 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 18,260 Value ($000) $2,293 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 20,828 Value ($000) $2,884 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 19,763 Value ($000) $3,022 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 23,029 Value ($000) $4,462 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 21,129 Value ($000) $4,904 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 35,159 Value ($000) $7,581 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 21,174 Value ($000) $5,481 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 21,088 Value ($000) $5,421 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 20,081 Value ($000) $5,719 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 21,246 Value ($000) $5,908 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 18,995 Value ($000) $5,259 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 16,661 Value ($000) $4,449 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 18,302 Value ($000) $3,733 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 358,995 Value ($000) $75,607 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 301,445 Value ($000) $72,324 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 136,852 Value ($000) $38,727 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 88,947 Value ($000) $30,806 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 74,201 Value ($000) $20,761 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 111,997 Value ($000) $27,418 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 119,930 Value ($000) $34,016 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 127,047 Value ($000) $33,986 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 79,414 Value ($000) $25,125 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 82,007 Value ($000) $24,331 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 79,338 Value ($000) $18,475 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 81,395 Value ($000) $19,036 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 78,114 Value ($000) $18,462 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 437,314 Value ($000) $131,595 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 516,120 Value ($000) $182,353 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 1,595,986 Value ($000) $463,220 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 1,565,633 Value ($000) $428,701 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 1,528,386 Value ($000) $486,900 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 1,440,151 Value ($000) $450,931 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,445,560 Value ($000) $392,265 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 30,853 Value ($000) $8,437 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 30,518 Value ($000) $8,660 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 28,074 Value ($000) $8,788 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 29,985 Value ($000) $7,252 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 32,046 Value ($000) $8,344 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 32,046 Value ($000) $9,816 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 32,046 Value ($000) $9,340 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 83,530 Value ($000) $33,746 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 111,850 Value ($000) $47,246 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 99,454 Value ($000) $33,785 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 99,194 Value ($000) $32,815 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 106,022 Value ($000) $33,434 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 151,104 Value ($000) $46,203 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 147,389 Value ($000) $41,221 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 161,866 Value ($000) $38,988 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 192,144 Value ($000) $41,863 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	20,252	$3,564	$163.37	$138.00 - $185.17
Q3 2025	18,260	$2,558	$135.17	$121.05 - $150.28
Q2 2025	18,260	$2,293	$124.60	$110.04 - $137.32
Q1 2025	20,828	$2,884	$142.96	$128.51 - $157.09
Q4 2024	19,763	$3,022	$168.67	$145.07 - $195.00
Q3 2024	23,029	$4,462	$209.21	$188.78 - $238.00
Q2 2024	21,129	$4,904	$217.32	$189.44 - $237.54
Q1 2024	35,159	$7,581	$234.20	$211.02 - $268.30
Q4 2023	21,174	$5,481	$245.62	$220.86 - $269.43
Q3 2023	21,088	$5,421	$267.47	$251.85 - $287.60
Q2 2023	20,081	$5,719	$297.86	$273.39 - $319.76
Q1 2023	21,246	$5,908	$276.70	$254.80 - $295.90
Q4 2022	18,995	$5,259	$282.44	$250.31 - $311.88
Q3 2022	16,661	$4,449	$212.38	$193.65 - $283.44
Q2 2022	18,302	$3,733	$204.43	$187.16 - $225.50
Q1 2022	358,995	$75,607	$217.46	$192.67 - $249.00
Q4 2021	301,445	$72,324	$257.12	$221.72 - $290.76
Q3 2021	136,852	$38,727	$327.75	$282.64 - $372.12
Q2 2021	88,947	$30,806	$302.94	$257.03 - $468.55
Q1 2021	74,201	$20,761	$269.69	$238.40 - $296.38
Q4 2020	111,997	$27,418	$259.08	$223.25 - $363.92
Q3 2020	119,930	$34,016	$278.91	$261.87 - $312.00
Q2 2020	127,047	$33,986	$300.59	$257.60 - $350.24
Q1 2020	79,414	$25,125	$303.47	$262.25 - $374.99
Q4 2019	82,007	$24,331	$277.46	$219.70 - $318.00
Q3 2019	79,338	$18,475	$232.85	$215.78 - $246.99
Q2 2019	81,395	$19,036	$230.90	$219.20 - $245.35
Q1 2019	78,114	$18,462	$314.89	$216.12 - $344.00
Q4 2018	437,314	$131,595	$319.14	$278.46 - $358.41
Q3 2018	516,120	$182,353	$344.30	$288.13 - $388.67
Q2 2018	1,595,986	$463,220	$281.15	$249.17 - $310.91
Q1 2018	1,565,633	$428,701	$310.41	$259.76 - $370.57
Q4 2017	1,528,386	$486,900	$320.80	$301.81 - $348.84
Q3 2017	1,440,151	$450,931	$296.11	$269.50 - $330.00
Q2 2017	1,445,560	$392,265	$264.42	$244.28 - $291.90
Q1 2017	30,853	$8,437	$282.75	$260.50 - $301.42
Q4 2016	30,518	$8,660	$296.43	$268.00 - $329.83
Q3 2016	28,074	$8,788	$296.18	$240.07 - $333.65
Q2 2016	29,985	$7,252	$263.54	$223.02 - $292.69
Q1 2016	32,046	$8,344	$264.15	$242.07 - $301.02
Q4 2015	32,046	$9,816	$287.35	$254.00 - $311.65
Q3 2015	32,046	$9,340	$330.23	$265.00 - $412.24
Q2 2015	83,530	$33,746	$401.33	$368.88 - $432.88
Q1 2015	111,850	$47,246	$394.14	$334.40 - $480.18
Q4 2014	99,454	$33,785	$323.51	$290.85 - $361.93
Q3 2014	99,194	$32,815	$329.72	$298.31 - $349.00
Q2 2014	106,022	$33,434	$300.97	$272.02 - $322.25
Q1 2014	151,104	$46,203	$317.43	$270.62 - $358.89
Q4 2013	147,389	$41,221	$258.65	$221.07 - $298.82
Q3 2013	161,866	$38,988	$223.81	$203.55 - $248.95
Q2 2013	192,144	$41,863	$213.68	$191.80 - $242.64