BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BARCLAYS PLC's Holding History (CIK: 0000312069)

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

Q4 2025

Shares 1,305,007 Value ($000) $229,668 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 921,256 Value ($000) $178,576 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 797,655 Value ($000) $100,177 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 918,353 Value ($000) $125,667 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 838,354 Value ($000) $128,201 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 921,256 Value ($000) $179 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 447,653 Value ($000) $103,775 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 540,565 Value ($000) $116,562 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 532,260 Value ($000) $137,733 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 395,676 Value ($000) $101,693 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 587,761 Value ($000) $167 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 457,843 Value ($000) $127 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 622,728 Value ($000) $172 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 335,857 Value ($000) $89,674 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 312,515 Value ($000) $63,734 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 379,381 Value ($000) $79,900 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 816,571 Value ($000) $195,912 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 384,914 Value ($000) $108,930 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 328,233 Value ($000) $113,657 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 295,355 Value ($000) $82,624 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 500,684 Value ($000) $122,598 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 419,262 Value ($000) $118,937 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 379,009 Value ($000) $101,407 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 399,035 Value ($000) $126,247 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 664,526 Value ($000) $197,183 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 524,801 Value ($000) $122,185 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 510,244 Value ($000) $119,327 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 390,972 Value ($000) $92,420 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 394,195 Value ($000) $118,620 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 339,885 Value ($000) $120,084 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 353,441 Value ($000) $102,581 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 471,274 Value ($000) $129,043 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 309,990 Value ($000) $98,753 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 153,842 Value ($000) $48,174 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 208,970 Value ($000) $56,704 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 159,540 Value ($000) $43,620 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 167,098 Value ($000) $47,388 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 151,253 Value ($000) $47,347 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 181,450 Value ($000) $43,879 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 260,201 Value ($000) $67,653 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 346,608 Value ($000) $106,062 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 550,164 Value ($000) $160,098 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 397,409 Value ($000) $160,155 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 386,925 Value ($000) $163,280 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 261,070 Value ($000) $88,500 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 204,950 Value ($000) $67,635 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 181,465 Value ($000) $57,161 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 443,167 Value ($000) $135,165 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 667,944 Value ($000) $186,355 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 317,401 Value ($000) $76,176 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 171,785 Value ($000) $36,968 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,305,007	$229,668	$163.37	$138.00 - $185.17
Q3 2025	921,256	$178,576	$135.17	$121.05 - $150.28
Q2 2025	797,655	$100,177	$124.60	$110.04 - $137.32
Q1 2025	918,353	$125,667	$142.96	$128.51 - $157.09
Q4 2024	838,354	$128,201	$168.67	$145.07 - $195.00
Q3 2024	921,256	$179	$209.21	$188.78 - $238.00
Q2 2024	447,653	$103,775	$217.32	$189.44 - $237.54
Q1 2024	540,565	$116,562	$234.20	$211.02 - $268.30
Q4 2023	532,260	$137,733	$245.62	$220.86 - $269.43
Q3 2023	395,676	$101,693	$267.47	$251.85 - $287.60
Q2 2023	587,761	$167	$297.86	$273.39 - $319.76
Q1 2023	457,843	$127	$276.70	$254.80 - $295.90
Q4 2022	622,728	$172	$282.44	$250.31 - $311.88
Q3 2022	335,857	$89,674	$212.38	$193.65 - $283.44
Q2 2022	312,515	$63,734	$204.43	$187.16 - $225.50
Q1 2022	379,381	$79,900	$217.46	$192.67 - $249.00
Q4 2021	816,571	$195,912	$257.12	$221.72 - $290.76
Q3 2021	384,914	$108,930	$327.75	$282.64 - $372.12
Q2 2021	328,233	$113,657	$302.94	$257.03 - $468.55
Q1 2021	295,355	$82,624	$269.69	$238.40 - $296.38
Q4 2020	500,684	$122,598	$259.08	$223.25 - $363.92
Q3 2020	419,262	$118,937	$278.91	$261.87 - $312.00
Q2 2020	379,009	$101,407	$300.59	$257.60 - $350.24
Q1 2020	399,035	$126,247	$303.47	$262.25 - $374.99
Q4 2019	664,526	$197,183	$277.46	$219.70 - $318.00
Q3 2019	524,801	$122,185	$232.85	$215.78 - $246.99
Q2 2019	510,244	$119,327	$230.90	$219.20 - $245.35
Q1 2019	390,972	$92,420	$314.89	$216.12 - $344.00
Q4 2018	394,195	$118,620	$319.14	$278.46 - $358.41
Q3 2018	339,885	$120,084	$344.30	$288.13 - $388.67
Q2 2018	353,441	$102,581	$281.15	$249.17 - $310.91
Q1 2018	471,274	$129,043	$310.41	$259.76 - $370.57
Q4 2017	309,990	$98,753	$320.80	$301.81 - $348.84
Q3 2017	153,842	$48,174	$296.11	$269.50 - $330.00
Q2 2017	208,970	$56,704	$264.42	$244.28 - $291.90
Q1 2017	159,540	$43,620	$282.75	$260.50 - $301.42
Q4 2016	167,098	$47,388	$296.43	$268.00 - $329.83
Q3 2016	151,253	$47,347	$296.18	$240.07 - $333.65
Q2 2016	181,450	$43,879	$263.54	$223.02 - $292.69
Q1 2016	260,201	$67,653	$264.15	$242.07 - $301.02
Q4 2015	346,608	$106,062	$287.35	$254.00 - $311.65
Q3 2015	550,164	$160,098	$330.23	$265.00 - $412.24
Q2 2015	397,409	$160,155	$401.33	$368.88 - $432.88
Q1 2015	386,925	$163,280	$394.14	$334.40 - $480.18
Q4 2014	261,070	$88,500	$323.51	$290.85 - $361.93
Q3 2014	204,950	$67,635	$329.72	$298.31 - $349.00
Q2 2014	181,465	$57,161	$300.97	$272.02 - $322.25
Q1 2014	443,167	$135,165	$317.43	$270.62 - $358.89
Q4 2013	667,944	$186,355	$258.65	$221.07 - $298.82
Q3 2013	317,401	$76,176	$223.81	$203.55 - $248.95
Q2 2013	171,785	$36,968	$213.68	$191.80 - $242.64