BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s Holding History (CIK: 0000912938)

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

Q4 2025

Shares 712,559 Value ($000) $125,403 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 729,316 Value ($000) $102,163 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 717,631 Value ($000) $90,127 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 708,415 Value ($000) $96,940 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 732,376 Value ($000) $111,995 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 711,184 Value ($000) $137,856 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 548,673 Value ($000) $127,193 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 574,975 Value ($000) $123,982 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 580,065 Value ($000) $150,103 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 446,602 Value ($000) $114,781 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 146,516 Value ($000) $41,735 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 147,087 Value ($000) $40,895 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 147,549 Value ($000) $40,859 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 228,020 Value ($000) $60,881 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 172,183 Value ($000) $35,115 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 205,556 Value ($000) $43,291 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 209,543 Value ($000) $50,273 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 203,982 Value ($000) $57,725 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 99,013 Value ($000) $34,285 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 35,457 Value ($000) $9,919 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 69,752 Value ($000) $17,079 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 121,850 Value ($000) $34,567 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 186,188 Value ($000) $49,814 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 222,174 Value ($000) $70,292 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 300,733 Value ($000) $89,236 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 459,076 Value ($000) $106,883 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 899,395 Value ($000) $210,343 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 1,833,573 Value ($000) $433,420 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 1,909,571 Value ($000) $574,628 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 1,862,429 Value ($000) $658,016 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 2,095,005 Value ($000) $608,054 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 2,076,215 Value ($000) $568,508 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 1,829,779 Value ($000) $582,912 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 1,791,870 Value ($000) $561,071 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,839,582 Value ($000) $499,189 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 1,352,164 Value ($000) $369,709 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 56,624 Value ($000) $16,057 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 56,090 Value ($000) $17,557 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 54,834 Value ($000) $13,259 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 124,611 Value ($000) $32,438 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 370,921 Value ($000) $113,632 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 801,743 Value ($000) $233,956 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 1,557,426 Value ($000) $629,106,658 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 1,494,392 Value ($000) $630,992,078 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 1,446,949 Value ($000) $491,166,837 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 1,660,949 Value ($000) $549,458 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 1,575,449 Value ($000) $496,754 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 1,322,693 Value ($000) $404,572,108 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 1,251,928 Value ($000) $350,004,015 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 1,180,088 Value ($000) $284,117,988 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 960,501 Value ($000) $206,699,815 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	712,559	$125,403	$163.37	$138.00 - $185.17
Q3 2025	729,316	$102,163	$135.17	$121.05 - $150.28
Q2 2025	717,631	$90,127	$124.60	$110.04 - $137.32
Q1 2025	708,415	$96,940	$142.96	$128.51 - $157.09
Q4 2024	732,376	$111,995	$168.67	$145.07 - $195.00
Q3 2024	711,184	$137,856	$209.21	$188.78 - $238.00
Q2 2024	548,673	$127,193	$217.32	$189.44 - $237.54
Q1 2024	574,975	$123,982	$234.20	$211.02 - $268.30
Q4 2023	580,065	$150,103	$245.62	$220.86 - $269.43
Q3 2023	446,602	$114,781	$267.47	$251.85 - $287.60
Q2 2023	146,516	$41,735	$297.86	$273.39 - $319.76
Q1 2023	147,087	$40,895	$276.70	$254.80 - $295.90
Q4 2022	147,549	$40,859	$282.44	$250.31 - $311.88
Q3 2022	228,020	$60,881	$212.38	$193.65 - $283.44
Q2 2022	172,183	$35,115	$204.43	$187.16 - $225.50
Q1 2022	205,556	$43,291	$217.46	$192.67 - $249.00
Q4 2021	209,543	$50,273	$257.12	$221.72 - $290.76
Q3 2021	203,982	$57,725	$327.75	$282.64 - $372.12
Q2 2021	99,013	$34,285	$302.94	$257.03 - $468.55
Q1 2021	35,457	$9,919	$269.69	$238.40 - $296.38
Q4 2020	69,752	$17,079	$259.08	$223.25 - $363.92
Q3 2020	121,850	$34,567	$278.91	$261.87 - $312.00
Q2 2020	186,188	$49,814	$300.59	$257.60 - $350.24
Q1 2020	222,174	$70,292	$303.47	$262.25 - $374.99
Q4 2019	300,733	$89,236	$277.46	$219.70 - $318.00
Q3 2019	459,076	$106,883	$232.85	$215.78 - $246.99
Q2 2019	899,395	$210,343	$230.90	$219.20 - $245.35
Q1 2019	1,833,573	$433,420	$314.89	$216.12 - $344.00
Q4 2018	1,909,571	$574,628	$319.14	$278.46 - $358.41
Q3 2018	1,862,429	$658,016	$344.30	$288.13 - $388.67
Q2 2018	2,095,005	$608,054	$281.15	$249.17 - $310.91
Q1 2018	2,076,215	$568,508	$310.41	$259.76 - $370.57
Q4 2017	1,829,779	$582,912	$320.80	$301.81 - $348.84
Q3 2017	1,791,870	$561,071	$296.11	$269.50 - $330.00
Q2 2017	1,839,582	$499,189	$264.42	$244.28 - $291.90
Q1 2017	1,352,164	$369,709	$282.75	$260.50 - $301.42
Q4 2016	56,624	$16,057	$296.43	$268.00 - $329.83
Q3 2016	56,090	$17,557	$296.18	$240.07 - $333.65
Q2 2016	54,834	$13,259	$263.54	$223.02 - $292.69
Q1 2016	124,611	$32,438	$264.15	$242.07 - $301.02
Q4 2015	370,921	$113,632	$287.35	$254.00 - $311.65
Q3 2015	801,743	$233,956	$330.23	$265.00 - $412.24
Q2 2015	1,557,426	$629,106,658	$401.33	$368.88 - $432.88
Q1 2015	1,494,392	$630,992,078	$394.14	$334.40 - $480.18
Q4 2014	1,446,949	$491,166,837	$323.51	$290.85 - $361.93
Q3 2014	1,660,949	$549,458	$329.72	$298.31 - $349.00
Q2 2014	1,575,449	$496,754	$300.97	$272.02 - $322.25
Q1 2014	1,322,693	$404,572,108	$317.43	$270.62 - $358.89
Q4 2013	1,251,928	$350,004,015	$258.65	$221.07 - $298.82
Q3 2013	1,180,088	$284,117,988	$223.81	$203.55 - $248.95
Q2 2013	960,501	$206,699,815	$213.68	$191.80 - $242.64