BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q3 2025

Shares 19,310 Value ($000) $2,705 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 90,218 Value ($000) $11,330 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 12,377 Value ($000) $1,694 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 57,921 Value ($000) $8,857 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 159,235 Value ($000) $30,866 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 116,653 Value ($000) $27,042 Avg Close $217.32 Range $189.44 - $237.54

Q4 2023

Shares 12,786 Value ($000) $3,309 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 9,248 Value ($000) $2,377 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 16,258 Value ($000) $4,631 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 9,308 Value ($000) $2,588 Avg Close $276.70 Range $254.80 - $295.90

Q3 2022

Shares 108,373 Value ($000) $28,936 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 74,902 Value ($000) $15,276 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 54,126 Value ($000) $11,399 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 42,771 Value ($000) $10,262 Avg Close $257.12 Range $221.72 - $290.76

Q1 2021

Shares 26,125 Value ($000) $7,308 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 34,345 Value ($000) $8,410 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 10,295 Value ($000) $2,920 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 39,024 Value ($000) $10,441 Avg Close $300.59 Range $257.60 - $350.24

Q4 2019

Shares 10,226 Value ($000) $3,034 Avg Close $277.46 Range $219.70 - $318.00

Q4 2017

Shares 10,566 Value ($000) $3,366 Avg Close $320.80 Range $301.81 - $348.84

Q2 2017

Shares 3,969 Value ($000) $1,077 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 2,281 Value ($000) $624 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 15,626 Value ($000) $4,431 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 21,056 Value ($000) $6,591 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 1,559 Value ($000) $377 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 2,159 Value ($000) $562 Avg Close $264.15 Range $242.07 - $301.02

Q3 2015

Shares 122 Value ($000) $36 Avg Close $330.23 Range $265.00 - $412.24

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	19,310	$2,705	$135.17	$121.05 - $150.28
Q2 2025	90,218	$11,330	$124.60	$110.04 - $137.32
Q1 2025	12,377	$1,694	$142.96	$128.51 - $157.09
Q4 2024	57,921	$8,857	$168.67	$145.07 - $195.00
Q3 2024	159,235	$30,866	$209.21	$188.78 - $238.00
Q2 2024	116,653	$27,042	$217.32	$189.44 - $237.54
Q4 2023	12,786	$3,309	$245.62	$220.86 - $269.43
Q3 2023	9,248	$2,377	$267.47	$251.85 - $287.60
Q2 2023	16,258	$4,631	$297.86	$273.39 - $319.76
Q1 2023	9,308	$2,588	$276.70	$254.80 - $295.90
Q3 2022	108,373	$28,936	$212.38	$193.65 - $283.44
Q2 2022	74,902	$15,276	$204.43	$187.16 - $225.50
Q1 2022	54,126	$11,399	$217.46	$192.67 - $249.00
Q4 2021	42,771	$10,262	$257.12	$221.72 - $290.76
Q1 2021	26,125	$7,308	$269.69	$238.40 - $296.38
Q4 2020	34,345	$8,410	$259.08	$223.25 - $363.92
Q3 2020	10,295	$2,920	$278.91	$261.87 - $312.00
Q2 2020	39,024	$10,441	$300.59	$257.60 - $350.24
Q4 2019	10,226	$3,034	$277.46	$219.70 - $318.00
Q4 2017	10,566	$3,366	$320.80	$301.81 - $348.84
Q2 2017	3,969	$1,077	$264.42	$244.28 - $291.90
Q1 2017	2,281	$624	$282.75	$260.50 - $301.42
Q4 2016	15,626	$4,431	$296.43	$268.00 - $329.83
Q3 2016	21,056	$6,591	$296.18	$240.07 - $333.65
Q2 2016	1,559	$377	$263.54	$223.02 - $292.69
Q1 2016	2,159	$562	$264.15	$242.07 - $301.02
Q3 2015	122	$36	$330.23	$265.00 - $412.24