BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

KBC Group NV's Holding History (CIK: 0001411133)

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

Q4 2025

Shares 53,398 Value ($000) $9 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 35,459 Value ($000) $5 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 35,204 Value ($000) $4 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 34,340 Value ($000) $5 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 33,490 Value ($000) $5 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 33,229 Value ($000) $6 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 41,981 Value ($000) $10 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 45,507 Value ($000) $10 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 50,836 Value ($000) $13 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 48,478 Value ($000) $12 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 72,310 Value ($000) $21 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 67,419 Value ($000) $19 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 38,541 Value ($000) $11 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 29,802 Value ($000) $8 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 32,196 Value ($000) $7 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 33,629 Value ($000) $7 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 40,696 Value ($000) $10 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 46,497 Value ($000) $13,158 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 47,630 Value ($000) $16,493 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 47,147 Value ($000) $13,190 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 49,086 Value ($000) $12,020 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 91,519 Value ($000) $25,962 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 89,224 Value ($000) $23,871 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 133,144 Value ($000) $42,124 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 143,623 Value ($000) $42,617 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 155,246 Value ($000) $36,145 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 83,347 Value ($000) $19,493 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 80,953 Value ($000) $19,136 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 48,804 Value ($000) $14,686 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 68,159 Value ($000) $24,081 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 80,622 Value ($000) $23,400 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 118,522 Value ($000) $32,453 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 122,415 Value ($000) $38,998 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 79,712 Value ($000) $24,960 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 79,279 Value ($000) $21,513 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 95,997 Value ($000) $26,247 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 175,617 Value ($000) $49,801 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 156,248 Value ($000) $48,911 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 90,776 Value ($000) $21,951 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 90,509 Value ($000) $23,561 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 91,597 Value ($000) $28,061 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 86,170 Value ($000) $25,146 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 111,807 Value ($000) $45,163 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 123,083 Value ($000) $51,970 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 138,035 Value ($000) $46,856 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 3,412 Value ($000) $1,128 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 164,420 Value ($000) $51,843 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 110,356 Value ($000) $33,755 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 114,316 Value ($000) $31,960 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 118,411 Value ($000) $28,509 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 84,231 Value ($000) $18,127 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	53,398	$9	$163.37	$138.00 - $185.17
Q3 2025	35,459	$5	$135.17	$121.05 - $150.28
Q2 2025	35,204	$4	$124.60	$110.04 - $137.32
Q1 2025	34,340	$5	$142.96	$128.51 - $157.09
Q4 2024	33,490	$5	$168.67	$145.07 - $195.00
Q3 2024	33,229	$6	$209.21	$188.78 - $238.00
Q2 2024	41,981	$10	$217.32	$189.44 - $237.54
Q1 2024	45,507	$10	$234.20	$211.02 - $268.30
Q4 2023	50,836	$13	$245.62	$220.86 - $269.43
Q3 2023	48,478	$12	$267.47	$251.85 - $287.60
Q2 2023	72,310	$21	$297.86	$273.39 - $319.76
Q1 2023	67,419	$19	$276.70	$254.80 - $295.90
Q4 2022	38,541	$11	$282.44	$250.31 - $311.88
Q3 2022	29,802	$8	$212.38	$193.65 - $283.44
Q2 2022	32,196	$7	$204.43	$187.16 - $225.50
Q1 2022	33,629	$7	$217.46	$192.67 - $249.00
Q4 2021	40,696	$10	$257.12	$221.72 - $290.76
Q3 2021	46,497	$13,158	$327.75	$282.64 - $372.12
Q2 2021	47,630	$16,493	$302.94	$257.03 - $468.55
Q1 2021	47,147	$13,190	$269.69	$238.40 - $296.38
Q4 2020	49,086	$12,020	$259.08	$223.25 - $363.92
Q3 2020	91,519	$25,962	$278.91	$261.87 - $312.00
Q2 2020	89,224	$23,871	$300.59	$257.60 - $350.24
Q1 2020	133,144	$42,124	$303.47	$262.25 - $374.99
Q4 2019	143,623	$42,617	$277.46	$219.70 - $318.00
Q3 2019	155,246	$36,145	$232.85	$215.78 - $246.99
Q2 2019	83,347	$19,493	$230.90	$219.20 - $245.35
Q1 2019	80,953	$19,136	$314.89	$216.12 - $344.00
Q4 2018	48,804	$14,686	$319.14	$278.46 - $358.41
Q3 2018	68,159	$24,081	$344.30	$288.13 - $388.67
Q2 2018	80,622	$23,400	$281.15	$249.17 - $310.91
Q1 2018	118,522	$32,453	$310.41	$259.76 - $370.57
Q4 2017	122,415	$38,998	$320.80	$301.81 - $348.84
Q3 2017	79,712	$24,960	$296.11	$269.50 - $330.00
Q2 2017	79,279	$21,513	$264.42	$244.28 - $291.90
Q1 2017	95,997	$26,247	$282.75	$260.50 - $301.42
Q4 2016	175,617	$49,801	$296.43	$268.00 - $329.83
Q3 2016	156,248	$48,911	$296.18	$240.07 - $333.65
Q2 2016	90,776	$21,951	$263.54	$223.02 - $292.69
Q1 2016	90,509	$23,561	$264.15	$242.07 - $301.02
Q4 2015	91,597	$28,061	$287.35	$254.00 - $311.65
Q3 2015	86,170	$25,146	$330.23	$265.00 - $412.24
Q2 2015	111,807	$45,163	$401.33	$368.88 - $432.88
Q1 2015	123,083	$51,970	$394.14	$334.40 - $480.18
Q4 2014	138,035	$46,856	$323.51	$290.85 - $361.93
Q3 2014	3,412	$1,128	$329.72	$298.31 - $349.00
Q2 2014	164,420	$51,843	$300.97	$272.02 - $322.25
Q1 2014	110,356	$33,755	$317.43	$270.62 - $358.89
Q4 2013	114,316	$31,960	$258.65	$221.07 - $298.82
Q3 2013	118,411	$28,509	$223.81	$203.55 - $248.95
Q2 2013	84,231	$18,127	$213.68	$191.80 - $242.64