BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

GABELLI FUNDS LLC's Holding History (CIK: 0001081407)

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

Q4 2025

Shares 15,400 Value ($000) $2,710 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 14,100 Value ($000) $1,975 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 14,100 Value ($000) $1,771 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 14,100 Value ($000) $1,929 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 14,100 Value ($000) $2,156 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 14,100 Value ($000) $2,733 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 14,400 Value ($000) $3,338 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 14,700 Value ($000) $3,170 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 14,700 Value ($000) $3,804 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 14,770 Value ($000) $3,796 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 14,550 Value ($000) $4,145 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 14,750 Value ($000) $4,101 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 14,925 Value ($000) $4,133 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 14,900 Value ($000) $3,978 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 15,300 Value ($000) $3,120 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 15,075 Value ($000) $3,175 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 15,075 Value ($000) $3,617 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 15,490 Value ($000) $4,384 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 15,355 Value ($000) $5,317 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 14,775 Value ($000) $4,133 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 14,600 Value ($000) $3,575 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 15,000 Value ($000) $4,255 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 15,200 Value ($000) $4,067 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 15,350 Value ($000) $4,856 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 15,500 Value ($000) $4,599 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 15,700 Value ($000) $3,655 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 16,000 Value ($000) $3,742 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 16,000 Value ($000) $3,782 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 18,700 Value ($000) $5,627 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 19,600 Value ($000) $6,925 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 20,200 Value ($000) $5,863 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 20,200 Value ($000) $5,531 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 33,000 Value ($000) $10,513 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 33,000 Value ($000) $10,333 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 33,000 Value ($000) $8,955 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 33,000 Value ($000) $9,023 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 32,400 Value ($000) $9,188 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 33,400 Value ($000) $10,455 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 33,400 Value ($000) $8,077 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 33,400 Value ($000) $8,695 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 38,215 Value ($000) $11,707 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 46,000 Value ($000) $13,423 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 48,000 Value ($000) $19,389 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 49,000 Value ($000) $20,690 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 54,300 Value ($000) $18,432 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 59,400 Value ($000) $19,650 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 68,500 Value ($000) $21,599 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 67,900 Value ($000) $20,769 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 69,400 Value ($000) $19,402 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 72,900 Value ($000) $17,551 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 79,000 Value ($000) $17,001 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	15,400	$2,710	$163.37	$138.00 - $185.17
Q3 2025	14,100	$1,975	$135.17	$121.05 - $150.28
Q2 2025	14,100	$1,771	$124.60	$110.04 - $137.32
Q1 2025	14,100	$1,929	$142.96	$128.51 - $157.09
Q4 2024	14,100	$2,156	$168.67	$145.07 - $195.00
Q3 2024	14,100	$2,733	$209.21	$188.78 - $238.00
Q2 2024	14,400	$3,338	$217.32	$189.44 - $237.54
Q1 2024	14,700	$3,170	$234.20	$211.02 - $268.30
Q4 2023	14,700	$3,804	$245.62	$220.86 - $269.43
Q3 2023	14,770	$3,796	$267.47	$251.85 - $287.60
Q2 2023	14,550	$4,145	$297.86	$273.39 - $319.76
Q1 2023	14,750	$4,101	$276.70	$254.80 - $295.90
Q4 2022	14,925	$4,133	$282.44	$250.31 - $311.88
Q3 2022	14,900	$3,978	$212.38	$193.65 - $283.44
Q2 2022	15,300	$3,120	$204.43	$187.16 - $225.50
Q1 2022	15,075	$3,175	$217.46	$192.67 - $249.00
Q4 2021	15,075	$3,617	$257.12	$221.72 - $290.76
Q3 2021	15,490	$4,384	$327.75	$282.64 - $372.12
Q2 2021	15,355	$5,317	$302.94	$257.03 - $468.55
Q1 2021	14,775	$4,133	$269.69	$238.40 - $296.38
Q4 2020	14,600	$3,575	$259.08	$223.25 - $363.92
Q3 2020	15,000	$4,255	$278.91	$261.87 - $312.00
Q2 2020	15,200	$4,067	$300.59	$257.60 - $350.24
Q1 2020	15,350	$4,856	$303.47	$262.25 - $374.99
Q4 2019	15,500	$4,599	$277.46	$219.70 - $318.00
Q3 2019	15,700	$3,655	$232.85	$215.78 - $246.99
Q2 2019	16,000	$3,742	$230.90	$219.20 - $245.35
Q1 2019	16,000	$3,782	$314.89	$216.12 - $344.00
Q4 2018	18,700	$5,627	$319.14	$278.46 - $358.41
Q3 2018	19,600	$6,925	$344.30	$288.13 - $388.67
Q2 2018	20,200	$5,863	$281.15	$249.17 - $310.91
Q1 2018	20,200	$5,531	$310.41	$259.76 - $370.57
Q4 2017	33,000	$10,513	$320.80	$301.81 - $348.84
Q3 2017	33,000	$10,333	$296.11	$269.50 - $330.00
Q2 2017	33,000	$8,955	$264.42	$244.28 - $291.90
Q1 2017	33,000	$9,023	$282.75	$260.50 - $301.42
Q4 2016	32,400	$9,188	$296.43	$268.00 - $329.83
Q3 2016	33,400	$10,455	$296.18	$240.07 - $333.65
Q2 2016	33,400	$8,077	$263.54	$223.02 - $292.69
Q1 2016	33,400	$8,695	$264.15	$242.07 - $301.02
Q4 2015	38,215	$11,707	$287.35	$254.00 - $311.65
Q3 2015	46,000	$13,423	$330.23	$265.00 - $412.24
Q2 2015	48,000	$19,389	$401.33	$368.88 - $432.88
Q1 2015	49,000	$20,690	$394.14	$334.40 - $480.18
Q4 2014	54,300	$18,432	$323.51	$290.85 - $361.93
Q3 2014	59,400	$19,650	$329.72	$298.31 - $349.00
Q2 2014	68,500	$21,599	$300.97	$272.02 - $322.25
Q1 2014	67,900	$20,769	$317.43	$270.62 - $358.89
Q4 2013	69,400	$19,402	$258.65	$221.07 - $298.82
Q3 2013	72,900	$17,551	$223.81	$203.55 - $248.95
Q2 2013	79,000	$17,001	$213.68	$191.80 - $242.64