BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

ONTARIO TEACHERS PENSION PLAN BOARD's Holding History (CIK: 0000937567)

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

Q2 2025

Shares 5,786 Value ($000) $727 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 10,849 Value ($000) $1,485 Avg Close $142.96 Range $128.51 - $157.09

Q2 2023

Shares 10,719 Value ($000) $3,053 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 3,002 Value ($000) $835 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 10,138 Value ($000) $2,807 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 13,225 Value ($000) $3,531 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 2,295 Value ($000) $468 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 4,709 Value ($000) $992 Avg Close $217.46 Range $192.67 - $249.00

Q3 2021

Shares 3,826 Value ($000) $1,083 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 1,050 Value ($000) $364 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 2,633 Value ($000) $737 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 7,821 Value ($000) $1,915 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 7,411 Value ($000) $2,102 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 9,623 Value ($000) $2,575 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 9,116 Value ($000) $2,884 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 16,481 Value ($000) $4,890 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 13,825 Value ($000) $3,219 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 10,659 Value ($000) $2,493 Avg Close $230.90 Range $219.20 - $245.35

Q4 2018

Shares 8,338 Value ($000) $2,509 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 6,203 Value ($000) $2,192 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 12,447 Value ($000) $3,613 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 15,872 Value ($000) $4,346 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 8,185 Value ($000) $2,607 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 6,407 Value ($000) $2,006 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 9,648 Value ($000) $2,618 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 5,298 Value ($000) $1,449 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 3,215 Value ($000) $912 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 2,775 Value ($000) $869 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 2,287 Value ($000) $553 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 2,609 Value ($000) $679 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 2,436 Value ($000) $746 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 2,146 Value ($000) $626 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 41,509 Value ($000) $16,767 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 41,509 Value ($000) $17,527 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 41,509 Value ($000) $14,090 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 41,004 Value ($000) $13,565 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 37,896 Value ($000) $11,949 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 37,330 Value ($000) $11,418 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 45,783 Value ($000) $12,800 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 55,695 Value ($000) $13,409 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 55,528 Value ($000) $11,950 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2025	5,786	$727	$124.60	$110.04 - $137.32
Q1 2025	10,849	$1,485	$142.96	$128.51 - $157.09
Q2 2023	10,719	$3,053	$297.86	$273.39 - $319.76
Q1 2023	3,002	$835	$276.70	$254.80 - $295.90
Q4 2022	10,138	$2,807	$282.44	$250.31 - $311.88
Q3 2022	13,225	$3,531	$212.38	$193.65 - $283.44
Q2 2022	2,295	$468	$204.43	$187.16 - $225.50
Q1 2022	4,709	$992	$217.46	$192.67 - $249.00
Q3 2021	3,826	$1,083	$327.75	$282.64 - $372.12
Q2 2021	1,050	$364	$302.94	$257.03 - $468.55
Q1 2021	2,633	$737	$269.69	$238.40 - $296.38
Q4 2020	7,821	$1,915	$259.08	$223.25 - $363.92
Q3 2020	7,411	$2,102	$278.91	$261.87 - $312.00
Q2 2020	9,623	$2,575	$300.59	$257.60 - $350.24
Q1 2020	9,116	$2,884	$303.47	$262.25 - $374.99
Q4 2019	16,481	$4,890	$277.46	$219.70 - $318.00
Q3 2019	13,825	$3,219	$232.85	$215.78 - $246.99
Q2 2019	10,659	$2,493	$230.90	$219.20 - $245.35
Q4 2018	8,338	$2,509	$319.14	$278.46 - $358.41
Q3 2018	6,203	$2,192	$344.30	$288.13 - $388.67
Q2 2018	12,447	$3,613	$281.15	$249.17 - $310.91
Q1 2018	15,872	$4,346	$310.41	$259.76 - $370.57
Q4 2017	8,185	$2,607	$320.80	$301.81 - $348.84
Q3 2017	6,407	$2,006	$296.11	$269.50 - $330.00
Q2 2017	9,648	$2,618	$264.42	$244.28 - $291.90
Q1 2017	5,298	$1,449	$282.75	$260.50 - $301.42
Q4 2016	3,215	$912	$296.43	$268.00 - $329.83
Q3 2016	2,775	$869	$296.18	$240.07 - $333.65
Q2 2016	2,287	$553	$263.54	$223.02 - $292.69
Q1 2016	2,609	$679	$264.15	$242.07 - $301.02
Q4 2015	2,436	$746	$287.35	$254.00 - $311.65
Q3 2015	2,146	$626	$330.23	$265.00 - $412.24
Q2 2015	41,509	$16,767	$401.33	$368.88 - $432.88
Q1 2015	41,509	$17,527	$394.14	$334.40 - $480.18
Q4 2014	41,509	$14,090	$323.51	$290.85 - $361.93
Q3 2014	41,004	$13,565	$329.72	$298.31 - $349.00
Q2 2014	37,896	$11,949	$300.97	$272.02 - $322.25
Q1 2014	37,330	$11,418	$317.43	$270.62 - $358.89
Q4 2013	45,783	$12,800	$258.65	$221.07 - $298.82
Q3 2013	55,695	$13,409	$223.81	$203.55 - $248.95
Q2 2013	55,528	$11,950	$213.68	$191.80 - $242.64