BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q4 2025

Shares 2,237 Value ($000) $394 Avg Close $163.37 Range $138.00 - $185.17

Q4 2024

Shares 13,690 Value ($000) $2,093 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 14,388 Value ($000) $2,789 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 14,266 Value ($000) $3,307 Avg Close $217.32 Range $189.44 - $237.54

Q3 2023

Shares 24,775 Value ($000) $6,367 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 14,911 Value ($000) $4,247 Avg Close $297.86 Range $273.39 - $319.76

Q1 2022

Shares 22,926 Value ($000) $4,828 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 194,146 Value ($000) $46,580 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 76,058 Value ($000) $21,524 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 13,235 Value ($000) $4,583 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 242 Value ($000) $68 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 1,630 Value ($000) $399 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 15,584 Value ($000) $4,421 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 18,646 Value ($000) $4,989 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 7,407 Value ($000) $2,343 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 2,018 Value ($000) $599 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 25,277 Value ($000) $5,885 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 1,530 Value ($000) $358 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 2,740 Value ($000) $648 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 14,322 Value ($000) $4,310 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 9,200 Value ($000) $3,250 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 3,112 Value ($000) $903 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 7,463 Value ($000) $2,044 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 13,740 Value ($000) $4,377 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 7,060 Value ($000) $2,211 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 16,592 Value ($000) $4,502 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 26,909 Value ($000) $7,357 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 30,365 Value ($000) $8,611 Avg Close $296.43 Range $268.00 - $329.83

Q1 2016

Shares 5,154 Value ($000) $1,342 Avg Close $264.15 Range $242.07 - $301.02

Q3 2015

Shares 7,613 Value ($000) $2,222 Avg Close $330.23 Range $265.00 - $412.24

Q1 2015

Shares 47,089 Value ($000) $19,883 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 5,180 Value ($000) $1,758 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 544 Value ($000) $180 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 37 Value ($000) $12 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 28,152 Value ($000) $8,611 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 13,738 Value ($000) $3,841 Avg Close $258.65 Range $221.07 - $298.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,237	$394	$163.37	$138.00 - $185.17
Q4 2024	13,690	$2,093	$168.67	$145.07 - $195.00
Q3 2024	14,388	$2,789	$209.21	$188.78 - $238.00
Q2 2024	14,266	$3,307	$217.32	$189.44 - $237.54
Q3 2023	24,775	$6,367	$267.47	$251.85 - $287.60
Q2 2023	14,911	$4,247	$297.86	$273.39 - $319.76
Q1 2022	22,926	$4,828	$217.46	$192.67 - $249.00
Q4 2021	194,146	$46,580	$257.12	$221.72 - $290.76
Q3 2021	76,058	$21,524	$327.75	$282.64 - $372.12
Q2 2021	13,235	$4,583	$302.94	$257.03 - $468.55
Q1 2021	242	$68	$269.69	$238.40 - $296.38
Q4 2020	1,630	$399	$259.08	$223.25 - $363.92
Q3 2020	15,584	$4,421	$278.91	$261.87 - $312.00
Q2 2020	18,646	$4,989	$300.59	$257.60 - $350.24
Q1 2020	7,407	$2,343	$303.47	$262.25 - $374.99
Q4 2019	2,018	$599	$277.46	$219.70 - $318.00
Q3 2019	25,277	$5,885	$232.85	$215.78 - $246.99
Q2 2019	1,530	$358	$230.90	$219.20 - $245.35
Q1 2019	2,740	$648	$314.89	$216.12 - $344.00
Q4 2018	14,322	$4,310	$319.14	$278.46 - $358.41
Q3 2018	9,200	$3,250	$344.30	$288.13 - $388.67
Q2 2018	3,112	$903	$281.15	$249.17 - $310.91
Q1 2018	7,463	$2,044	$310.41	$259.76 - $370.57
Q4 2017	13,740	$4,377	$320.80	$301.81 - $348.84
Q3 2017	7,060	$2,211	$296.11	$269.50 - $330.00
Q2 2017	16,592	$4,502	$264.42	$244.28 - $291.90
Q1 2017	26,909	$7,357	$282.75	$260.50 - $301.42
Q4 2016	30,365	$8,611	$296.43	$268.00 - $329.83
Q1 2016	5,154	$1,342	$264.15	$242.07 - $301.02
Q3 2015	7,613	$2,222	$330.23	$265.00 - $412.24
Q1 2015	47,089	$19,883	$394.14	$334.40 - $480.18
Q4 2014	5,180	$1,758	$323.51	$290.85 - $361.93
Q3 2014	544	$180	$329.72	$298.31 - $349.00
Q2 2014	37	$12	$300.97	$272.02 - $322.25
Q1 2014	28,152	$8,611	$317.43	$270.62 - $358.89
Q4 2013	13,738	$3,841	$258.65	$221.07 - $298.82