BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

VANGUARD GROUP INC's Holding History (CIK: 0000102909)

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

Q4 2025

Shares 17,447,092 Value ($000) $3,070,514 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 17,289,235 Value ($000) $2,421,876 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 17,290,651 Value ($000) $2,171,533 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 17,032,839 Value ($000) $2,330,774 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 16,748,875 Value ($000) $2,561,238 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 16,678,507 Value ($000) $3,232,962 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 16,600,163 Value ($000) $3,848,250 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 16,570,398 Value ($000) $3,573,075 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 14,407,330 Value ($000) $3,728,185 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 12,188,586 Value ($000) $3,132,588 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 12,196,436 Value ($000) $3,474,155 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 12,157,662 Value ($000) $3,380,195 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 11,976,623 Value ($000) $3,316,566 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 11,914,973 Value ($000) $3,181,298 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 11,860,022 Value ($000) $2,418,733 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 11,720,584 Value ($000) $2,468,356 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 11,537,299 Value ($000) $2,768,029 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 11,691,876 Value ($000) $3,308,684 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 11,753,333 Value ($000) $4,069,827 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 11,853,658 Value ($000) $3,316,059 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 11,896,510 Value ($000) $2,912,979 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 12,348,072 Value ($000) $3,502,903 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 12,876,107 Value ($000) $3,445,001 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 14,238,227 Value ($000) $4,504,690 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 13,870,538 Value ($000) $4,115,804 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 14,095,526 Value ($000) $3,281,721 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 14,815,354 Value ($000) $3,464,867 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 15,015,471 Value ($000) $3,549,358 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 15,170,607 Value ($000) $4,565,140 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 14,814,125 Value ($000) $5,233,978 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 15,297,924 Value ($000) $4,440,070 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 15,129,243 Value ($000) $4,142,689 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 14,871,019 Value ($000) $4,737,460 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 14,668,942 Value ($000) $4,593,140 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 14,534,827 Value ($000) $3,944,171 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 14,352,490 Value ($000) $3,924,258 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 14,009,922 Value ($000) $3,972,934 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 13,846,056 Value ($000) $4,334,231 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 13,544,616 Value ($000) $3,275,359 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 13,361,902 Value ($000) $3,478,370 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 13,228,502 Value ($000) $4,052,552 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 13,577,534 Value ($000) $3,962,059 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 13,381,395 Value ($000) $5,405,281 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 13,142,336 Value ($000) $5,549,219 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 12,730,694 Value ($000) $4,321,434 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 12,335,234 Value ($000) $4,080,619 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 12,086,297 Value ($000) $3,810,930 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 11,899,130 Value ($000) $3,639,587 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 11,623,653 Value ($000) $3,251,707 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 11,517,882 Value ($000) $2,773,045 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 11,348,173 Value ($000) $2,442,127 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	17,447,092	$3,070,514	$163.37	$138.00 - $185.17
Q3 2025	17,289,235	$2,421,876	$135.17	$121.05 - $150.28
Q2 2025	17,290,651	$2,171,533	$124.60	$110.04 - $137.32
Q1 2025	17,032,839	$2,330,774	$142.96	$128.51 - $157.09
Q4 2024	16,748,875	$2,561,238	$168.67	$145.07 - $195.00
Q3 2024	16,678,507	$3,232,962	$209.21	$188.78 - $238.00
Q2 2024	16,600,163	$3,848,250	$217.32	$189.44 - $237.54
Q1 2024	16,570,398	$3,573,075	$234.20	$211.02 - $268.30
Q4 2023	14,407,330	$3,728,185	$245.62	$220.86 - $269.43
Q3 2023	12,188,586	$3,132,588	$267.47	$251.85 - $287.60
Q2 2023	12,196,436	$3,474,155	$297.86	$273.39 - $319.76
Q1 2023	12,157,662	$3,380,195	$276.70	$254.80 - $295.90
Q4 2022	11,976,623	$3,316,566	$282.44	$250.31 - $311.88
Q3 2022	11,914,973	$3,181,298	$212.38	$193.65 - $283.44
Q2 2022	11,860,022	$2,418,733	$204.43	$187.16 - $225.50
Q1 2022	11,720,584	$2,468,356	$217.46	$192.67 - $249.00
Q4 2021	11,537,299	$2,768,029	$257.12	$221.72 - $290.76
Q3 2021	11,691,876	$3,308,684	$327.75	$282.64 - $372.12
Q2 2021	11,753,333	$4,069,827	$302.94	$257.03 - $468.55
Q1 2021	11,853,658	$3,316,059	$269.69	$238.40 - $296.38
Q4 2020	11,896,510	$2,912,979	$259.08	$223.25 - $363.92
Q3 2020	12,348,072	$3,502,903	$278.91	$261.87 - $312.00
Q2 2020	12,876,107	$3,445,001	$300.59	$257.60 - $350.24
Q1 2020	14,238,227	$4,504,690	$303.47	$262.25 - $374.99
Q4 2019	13,870,538	$4,115,804	$277.46	$219.70 - $318.00
Q3 2019	14,095,526	$3,281,721	$232.85	$215.78 - $246.99
Q2 2019	14,815,354	$3,464,867	$230.90	$219.20 - $245.35
Q1 2019	15,015,471	$3,549,358	$314.89	$216.12 - $344.00
Q4 2018	15,170,607	$4,565,140	$319.14	$278.46 - $358.41
Q3 2018	14,814,125	$5,233,978	$344.30	$288.13 - $388.67
Q2 2018	15,297,924	$4,440,070	$281.15	$249.17 - $310.91
Q1 2018	15,129,243	$4,142,689	$310.41	$259.76 - $370.57
Q4 2017	14,871,019	$4,737,460	$320.80	$301.81 - $348.84
Q3 2017	14,668,942	$4,593,140	$296.11	$269.50 - $330.00
Q2 2017	14,534,827	$3,944,171	$264.42	$244.28 - $291.90
Q1 2017	14,352,490	$3,924,258	$282.75	$260.50 - $301.42
Q4 2016	14,009,922	$3,972,934	$296.43	$268.00 - $329.83
Q3 2016	13,846,056	$4,334,231	$296.18	$240.07 - $333.65
Q2 2016	13,544,616	$3,275,359	$263.54	$223.02 - $292.69
Q1 2016	13,361,902	$3,478,370	$264.15	$242.07 - $301.02
Q4 2015	13,228,502	$4,052,552	$287.35	$254.00 - $311.65
Q3 2015	13,577,534	$3,962,059	$330.23	$265.00 - $412.24
Q2 2015	13,381,395	$5,405,281	$401.33	$368.88 - $432.88
Q1 2015	13,142,336	$5,549,219	$394.14	$334.40 - $480.18
Q4 2014	12,730,694	$4,321,434	$323.51	$290.85 - $361.93
Q3 2014	12,335,234	$4,080,619	$329.72	$298.31 - $349.00
Q2 2014	12,086,297	$3,810,930	$300.97	$272.02 - $322.25
Q1 2014	11,899,130	$3,639,587	$317.43	$270.62 - $358.89
Q4 2013	11,623,653	$3,251,707	$258.65	$221.07 - $298.82
Q3 2013	11,517,882	$2,773,045	$223.81	$203.55 - $248.95
Q2 2013	11,348,173	$2,442,127	$213.68	$191.80 - $242.64