BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Public Sector Pension Investment Board's Holding History (CIK: 0001396318)

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

Q4 2025

Shares 19,190 Value ($000) $3,377 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 12,846 Value ($000) $1,799 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 11,252 Value ($000) $1,413 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 20,107 Value ($000) $2,751 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 18,362 Value ($000) $2,808 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 6,361 Value ($000) $1,233 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 5,661 Value ($000) $1,312 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 3,196 Value ($000) $689 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 3,296 Value ($000) $853 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 15,550 Value ($000) $3,997 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 13,860 Value ($000) $3,948 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 15,844 Value ($000) $4,405 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 17,991 Value ($000) $4,982 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 15,647 Value ($000) $4 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 14,037 Value ($000) $2,863 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 20,546 Value ($000) $4,327 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 24,506 Value ($000) $5,879 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 77,979 Value ($000) $22,067 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 23,606 Value ($000) $8,174 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 14,406 Value ($000) $4,030 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 12,449 Value ($000) $3,048 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 19,490 Value ($000) $5,529 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 16,157 Value ($000) $4,323 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 18,076 Value ($000) $5,719 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 31,316 Value ($000) $9,292 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 35,776 Value ($000) $8,329 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 25,328 Value ($000) $5,923 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 37,928 Value ($000) $8,965 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 17,728 Value ($000) $5,335 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 9,428 Value ($000) $3,331 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 16,528 Value ($000) $4,797 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 16,228 Value ($000) $4,444 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 23,728 Value ($000) $7,559 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 53,728 Value ($000) $16,823 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 24,430 Value ($000) $6,629 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 49,130 Value ($000) $13,433 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 48,130 Value ($000) $13,649 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 49,130 Value ($000) $15,379 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 41,530 Value ($000) $10,043 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 35,330 Value ($000) $9,197 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 56,930 Value ($000) $17,441 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 61,930 Value ($000) $18,072 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 80,930 Value ($000) $32,691 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 81,430 Value ($000) $34,383 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 79,974 Value ($000) $27,147 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 87,074 Value ($000) $28,805 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 89,274 Value ($000) $28,149 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 86,590 Value ($000) $26,485 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 87,790 Value ($000) $24,559 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 79,190 Value ($000) $19,066 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 81,690 Value ($000) $17,580 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	19,190	$3,377	$163.37	$138.00 - $185.17
Q3 2025	12,846	$1,799	$135.17	$121.05 - $150.28
Q2 2025	11,252	$1,413	$124.60	$110.04 - $137.32
Q1 2025	20,107	$2,751	$142.96	$128.51 - $157.09
Q4 2024	18,362	$2,808	$168.67	$145.07 - $195.00
Q3 2024	6,361	$1,233	$209.21	$188.78 - $238.00
Q2 2024	5,661	$1,312	$217.32	$189.44 - $237.54
Q1 2024	3,196	$689	$234.20	$211.02 - $268.30
Q4 2023	3,296	$853	$245.62	$220.86 - $269.43
Q3 2023	15,550	$3,997	$267.47	$251.85 - $287.60
Q2 2023	13,860	$3,948	$297.86	$273.39 - $319.76
Q1 2023	15,844	$4,405	$276.70	$254.80 - $295.90
Q4 2022	17,991	$4,982	$282.44	$250.31 - $311.88
Q3 2022	15,647	$4	$212.38	$193.65 - $283.44
Q2 2022	14,037	$2,863	$204.43	$187.16 - $225.50
Q1 2022	20,546	$4,327	$217.46	$192.67 - $249.00
Q4 2021	24,506	$5,879	$257.12	$221.72 - $290.76
Q3 2021	77,979	$22,067	$327.75	$282.64 - $372.12
Q2 2021	23,606	$8,174	$302.94	$257.03 - $468.55
Q1 2021	14,406	$4,030	$269.69	$238.40 - $296.38
Q4 2020	12,449	$3,048	$259.08	$223.25 - $363.92
Q3 2020	19,490	$5,529	$278.91	$261.87 - $312.00
Q2 2020	16,157	$4,323	$300.59	$257.60 - $350.24
Q1 2020	18,076	$5,719	$303.47	$262.25 - $374.99
Q4 2019	31,316	$9,292	$277.46	$219.70 - $318.00
Q3 2019	35,776	$8,329	$232.85	$215.78 - $246.99
Q2 2019	25,328	$5,923	$230.90	$219.20 - $245.35
Q1 2019	37,928	$8,965	$314.89	$216.12 - $344.00
Q4 2018	17,728	$5,335	$319.14	$278.46 - $358.41
Q3 2018	9,428	$3,331	$344.30	$288.13 - $388.67
Q2 2018	16,528	$4,797	$281.15	$249.17 - $310.91
Q1 2018	16,228	$4,444	$310.41	$259.76 - $370.57
Q4 2017	23,728	$7,559	$320.80	$301.81 - $348.84
Q3 2017	53,728	$16,823	$296.11	$269.50 - $330.00
Q2 2017	24,430	$6,629	$264.42	$244.28 - $291.90
Q1 2017	49,130	$13,433	$282.75	$260.50 - $301.42
Q4 2016	48,130	$13,649	$296.43	$268.00 - $329.83
Q3 2016	49,130	$15,379	$296.18	$240.07 - $333.65
Q2 2016	41,530	$10,043	$263.54	$223.02 - $292.69
Q1 2016	35,330	$9,197	$264.15	$242.07 - $301.02
Q4 2015	56,930	$17,441	$287.35	$254.00 - $311.65
Q3 2015	61,930	$18,072	$330.23	$265.00 - $412.24
Q2 2015	80,930	$32,691	$401.33	$368.88 - $432.88
Q1 2015	81,430	$34,383	$394.14	$334.40 - $480.18
Q4 2014	79,974	$27,147	$323.51	$290.85 - $361.93
Q3 2014	87,074	$28,805	$329.72	$298.31 - $349.00
Q2 2014	89,274	$28,149	$300.97	$272.02 - $322.25
Q1 2014	86,590	$26,485	$317.43	$270.62 - $358.89
Q4 2013	87,790	$24,559	$258.65	$221.07 - $298.82
Q3 2013	79,190	$19,066	$223.81	$203.55 - $248.95
Q2 2013	81,690	$17,580	$213.68	$191.80 - $242.64