BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

NATIXIS ADVISORS, L.P.'s Holding History (CIK: 0001018331)

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

Q4 2025

Shares 33,336 Value ($000) $6 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 39,516 Value ($000) $6 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 38,199 Value ($000) $5 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 26,907 Value ($000) $4 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 16,961 Value ($000) $3 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 24,757 Value ($000) $5 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 34,811 Value ($000) $8 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 25,097 Value ($000) $5 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 24,166 Value ($000) $6 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 23,601 Value ($000) $6 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 28,321 Value ($000) $8 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 26,530 Value ($000) $7 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 22,101 Value ($000) $6 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 21,227 Value ($000) $5,668 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 17,851 Value ($000) $3,641 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 15,878 Value ($000) $3,344 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 16,399 Value ($000) $3,935 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 21,925 Value ($000) $6,204 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 20,005 Value ($000) $6,927 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 19,324 Value ($000) $5,405 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 19,256 Value ($000) $4,715 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 87,173 Value ($000) $24,729 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 85,416 Value ($000) $22,853 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 100,618 Value ($000) $31,833 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 89,186 Value ($000) $26,464 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 90,385 Value ($000) $21,043 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 84,256 Value ($000) $19,705 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 59,257 Value ($000) $14,007 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 72,781 Value ($000) $21,901 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 81,634 Value ($000) $28,841 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 81,025 Value ($000) $23,516 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 79,812 Value ($000) $21,855 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 69,251 Value ($000) $22,061 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 64,732 Value ($000) $20,268 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 60,577 Value ($000) $16,438 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 58,812 Value ($000) $16,080 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 54,734 Value ($000) $15,522 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 46,348 Value ($000) $14,508 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 48,153 Value ($000) $11,644 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 44,851 Value ($000) $11,676 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 37,431 Value ($000) $11,467 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 49,644 Value ($000) $14,487 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 48,086 Value ($000) $19,424 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 43,747 Value ($000) $18,472 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 42,391 Value ($000) $14,390 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 37,639 Value ($000) $12,451 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 24,211 Value ($000) $7,634 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 23,761 Value ($000) $7,268 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 22,008 Value ($000) $6,153 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 20,996 Value ($000) $5,055 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 20,434 Value ($000) $4,398 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	33,336	$6	$163.37	$138.00 - $185.17
Q3 2025	39,516	$6	$135.17	$121.05 - $150.28
Q2 2025	38,199	$5	$124.60	$110.04 - $137.32
Q1 2025	26,907	$4	$142.96	$128.51 - $157.09
Q4 2024	16,961	$3	$168.67	$145.07 - $195.00
Q3 2024	24,757	$5	$209.21	$188.78 - $238.00
Q2 2024	34,811	$8	$217.32	$189.44 - $237.54
Q1 2024	25,097	$5	$234.20	$211.02 - $268.30
Q4 2023	24,166	$6	$245.62	$220.86 - $269.43
Q3 2023	23,601	$6	$267.47	$251.85 - $287.60
Q2 2023	28,321	$8	$297.86	$273.39 - $319.76
Q1 2023	26,530	$7	$276.70	$254.80 - $295.90
Q4 2022	22,101	$6	$282.44	$250.31 - $311.88
Q3 2022	21,227	$5,668	$212.38	$193.65 - $283.44
Q2 2022	17,851	$3,641	$204.43	$187.16 - $225.50
Q1 2022	15,878	$3,344	$217.46	$192.67 - $249.00
Q4 2021	16,399	$3,935	$257.12	$221.72 - $290.76
Q3 2021	21,925	$6,204	$327.75	$282.64 - $372.12
Q2 2021	20,005	$6,927	$302.94	$257.03 - $468.55
Q1 2021	19,324	$5,405	$269.69	$238.40 - $296.38
Q4 2020	19,256	$4,715	$259.08	$223.25 - $363.92
Q3 2020	87,173	$24,729	$278.91	$261.87 - $312.00
Q2 2020	85,416	$22,853	$300.59	$257.60 - $350.24
Q1 2020	100,618	$31,833	$303.47	$262.25 - $374.99
Q4 2019	89,186	$26,464	$277.46	$219.70 - $318.00
Q3 2019	90,385	$21,043	$232.85	$215.78 - $246.99
Q2 2019	84,256	$19,705	$230.90	$219.20 - $245.35
Q1 2019	59,257	$14,007	$314.89	$216.12 - $344.00
Q4 2018	72,781	$21,901	$319.14	$278.46 - $358.41
Q3 2018	81,634	$28,841	$344.30	$288.13 - $388.67
Q2 2018	81,025	$23,516	$281.15	$249.17 - $310.91
Q1 2018	79,812	$21,855	$310.41	$259.76 - $370.57
Q4 2017	69,251	$22,061	$320.80	$301.81 - $348.84
Q3 2017	64,732	$20,268	$296.11	$269.50 - $330.00
Q2 2017	60,577	$16,438	$264.42	$244.28 - $291.90
Q1 2017	58,812	$16,080	$282.75	$260.50 - $301.42
Q4 2016	54,734	$15,522	$296.43	$268.00 - $329.83
Q3 2016	46,348	$14,508	$296.18	$240.07 - $333.65
Q2 2016	48,153	$11,644	$263.54	$223.02 - $292.69
Q1 2016	44,851	$11,676	$264.15	$242.07 - $301.02
Q4 2015	37,431	$11,467	$287.35	$254.00 - $311.65
Q3 2015	49,644	$14,487	$330.23	$265.00 - $412.24
Q2 2015	48,086	$19,424	$401.33	$368.88 - $432.88
Q1 2015	43,747	$18,472	$394.14	$334.40 - $480.18
Q4 2014	42,391	$14,390	$323.51	$290.85 - $361.93
Q3 2014	37,639	$12,451	$329.72	$298.31 - $349.00
Q2 2014	24,211	$7,634	$300.97	$272.02 - $322.25
Q1 2014	23,761	$7,268	$317.43	$270.62 - $358.89
Q4 2013	22,008	$6,153	$258.65	$221.07 - $298.82
Q3 2013	20,996	$5,055	$223.81	$203.55 - $248.95
Q2 2013	20,434	$4,398	$213.68	$191.80 - $242.64