BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

GREAT WEST LIFE ASSURANCE CO /CAN/'s Holding History (CIK: 0001046192)

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

Q4 2025

Shares 103,100 Value ($000) $18 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 135,657 Value ($000) $19 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 130,933 Value ($000) $16 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 125,507 Value ($000) $17 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 126,631 Value ($000) $19 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 129,888 Value ($000) $25 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 129,766 Value ($000) $30 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 125,227 Value ($000) $27 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 145,643 Value ($000) $38 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 162,161 Value ($000) $42 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 158,657 Value ($000) $45 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 166,710 Value ($000) $46 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 141,665 Value ($000) $39 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 149,785 Value ($000) $39,947 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 159,582 Value ($000) $32,576 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 209,410 Value ($000) $46,452 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 213,387 Value ($000) $51,085 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 241,774 Value ($000) $68,854 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 241,935 Value ($000) $83,750 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 264,694 Value ($000) $73,669 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 295,699 Value ($000) $72,228 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 308,512 Value ($000) $87,457 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 334,117 Value ($000) $89,069 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 228,132 Value ($000) $72,543 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 217,507 Value ($000) $64,025 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 229,532 Value ($000) $53,468 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 234,763 Value ($000) $54,863 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 239,259 Value ($000) $56,432 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 205,950 Value ($000) $58,766 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 187,180 Value ($000) $66,176 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 205,884 Value ($000) $59,770 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 224,321 Value ($000) $61,462 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 212,764 Value ($000) $67,714 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 220,116 Value ($000) $68,224 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 228,881 Value ($000) $62,027 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 186,880 Value ($000) $51,051 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 183,862 Value ($000) $52,297 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 183,703 Value ($000) $57,469 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 176,381 Value ($000) $42,563 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 143,811 Value ($000) $37,406 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 137,441 Value ($000) $42,129 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 158,768 Value ($000) $46,287 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 177,796 Value ($000) $71,716 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 193,897 Value ($000) $81,667 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 157,478 Value ($000) $53,405 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 159,785 Value ($000) $52,973 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 166,634 Value ($000) $52,399 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 212,085 Value ($000) $64,521 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 194,596 Value ($000) $54,639 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 234,758 Value ($000) $56,452 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 137,674 Value ($000) $29,648 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	103,100	$18	$163.37	$138.00 - $185.17
Q3 2025	135,657	$19	$135.17	$121.05 - $150.28
Q2 2025	130,933	$16	$124.60	$110.04 - $137.32
Q1 2025	125,507	$17	$142.96	$128.51 - $157.09
Q4 2024	126,631	$19	$168.67	$145.07 - $195.00
Q3 2024	129,888	$25	$209.21	$188.78 - $238.00
Q2 2024	129,766	$30	$217.32	$189.44 - $237.54
Q1 2024	125,227	$27	$234.20	$211.02 - $268.30
Q4 2023	145,643	$38	$245.62	$220.86 - $269.43
Q3 2023	162,161	$42	$267.47	$251.85 - $287.60
Q2 2023	158,657	$45	$297.86	$273.39 - $319.76
Q1 2023	166,710	$46	$276.70	$254.80 - $295.90
Q4 2022	141,665	$39	$282.44	$250.31 - $311.88
Q3 2022	149,785	$39,947	$212.38	$193.65 - $283.44
Q2 2022	159,582	$32,576	$204.43	$187.16 - $225.50
Q1 2022	209,410	$46,452	$217.46	$192.67 - $249.00
Q4 2021	213,387	$51,085	$257.12	$221.72 - $290.76
Q3 2021	241,774	$68,854	$327.75	$282.64 - $372.12
Q2 2021	241,935	$83,750	$302.94	$257.03 - $468.55
Q1 2021	264,694	$73,669	$269.69	$238.40 - $296.38
Q4 2020	295,699	$72,228	$259.08	$223.25 - $363.92
Q3 2020	308,512	$87,457	$278.91	$261.87 - $312.00
Q2 2020	334,117	$89,069	$300.59	$257.60 - $350.24
Q1 2020	228,132	$72,543	$303.47	$262.25 - $374.99
Q4 2019	217,507	$64,025	$277.46	$219.70 - $318.00
Q3 2019	229,532	$53,468	$232.85	$215.78 - $246.99
Q2 2019	234,763	$54,863	$230.90	$219.20 - $245.35
Q1 2019	239,259	$56,432	$314.89	$216.12 - $344.00
Q4 2018	205,950	$58,766	$319.14	$278.46 - $358.41
Q3 2018	187,180	$66,176	$344.30	$288.13 - $388.67
Q2 2018	205,884	$59,770	$281.15	$249.17 - $310.91
Q1 2018	224,321	$61,462	$310.41	$259.76 - $370.57
Q4 2017	212,764	$67,714	$320.80	$301.81 - $348.84
Q3 2017	220,116	$68,224	$296.11	$269.50 - $330.00
Q2 2017	228,881	$62,027	$264.42	$244.28 - $291.90
Q1 2017	186,880	$51,051	$282.75	$260.50 - $301.42
Q4 2016	183,862	$52,297	$296.43	$268.00 - $329.83
Q3 2016	183,703	$57,469	$296.18	$240.07 - $333.65
Q2 2016	176,381	$42,563	$263.54	$223.02 - $292.69
Q1 2016	143,811	$37,406	$264.15	$242.07 - $301.02
Q4 2015	137,441	$42,129	$287.35	$254.00 - $311.65
Q3 2015	158,768	$46,287	$330.23	$265.00 - $412.24
Q2 2015	177,796	$71,716	$401.33	$368.88 - $432.88
Q1 2015	193,897	$81,667	$394.14	$334.40 - $480.18
Q4 2014	157,478	$53,405	$323.51	$290.85 - $361.93
Q3 2014	159,785	$52,973	$329.72	$298.31 - $349.00
Q2 2014	166,634	$52,399	$300.97	$272.02 - $322.25
Q1 2014	212,085	$64,521	$317.43	$270.62 - $358.89
Q4 2013	194,596	$54,639	$258.65	$221.07 - $298.82
Q3 2013	234,758	$56,452	$223.81	$203.55 - $248.95
Q2 2013	137,674	$29,648	$213.68	$191.80 - $242.64