BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO's Holding History (CIK: 0001007280)

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

Q4 2025

Shares 47,370 Value ($000) $8,337 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 49,029 Value ($000) $6,868 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 45,355 Value ($000) $5,696 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 44,863 Value ($000) $6,139 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 50,051 Value ($000) $7,654 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 52,917 Value ($000) $10,257 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 59,369 Value ($000) $13,763 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 64,530 Value ($000) $13,915 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 71,793 Value ($000) $18,578 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 72,821 Value ($000) $18,716 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 81,915 Value ($000) $23,333 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 88,261 Value ($000) $24,539 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 79,641 Value ($000) $22,054 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 74,912 Value ($000) $20,002 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 74,346 Value ($000) $15,162 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 87,331 Value ($000) $18,392 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 90,702 Value ($000) $21,761 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 94,787 Value ($000) $26,824 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 96,220 Value ($000) $33,318 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 97,459 Value ($000) $27,264 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 93,481 Value ($000) $22,890 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 93,440 Value ($000) $26,507 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 102,516 Value ($000) $27,428 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 99,275 Value ($000) $31,409 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 113,657 Value ($000) $33,725 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 114,516 Value ($000) $26,662 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 119,756 Value ($000) $28,007 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 128,735 Value ($000) $30,430 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 134,512 Value ($000) $40,477 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 135,264 Value ($000) $47,790 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 140,988 Value ($000) $40,920 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 147,395 Value ($000) $40,360 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 149,831 Value ($000) $47,732 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 147,021 Value ($000) $46,035 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 146,501 Value ($000) $39,755 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 149,969 Value ($000) $41,005 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 149,969 Value ($000) $43,136 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 149,969 Value ($000) $46,945 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 149,969 Value ($000) $36,266 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 156,902 Value ($000) $40,845 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 164,442 Value ($000) $50,377 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 174,484 Value ($000) $50,916 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 174,452 Value ($000) $70,468 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 176,523 Value ($000) $74,535 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 176,025 Value ($000) $59,752 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 176,886 Value ($000) $58,516 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 184,984 Value ($000) $58,327 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 188,505 Value ($000) $57,658 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 204,178 Value ($000) $57,119 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 201,360 Value ($000) $48,479 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 207,669 Value ($000) $44,690 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	47,370	$8,337	$163.37	$138.00 - $185.17
Q3 2025	49,029	$6,868	$135.17	$121.05 - $150.28
Q2 2025	45,355	$5,696	$124.60	$110.04 - $137.32
Q1 2025	44,863	$6,139	$142.96	$128.51 - $157.09
Q4 2024	50,051	$7,654	$168.67	$145.07 - $195.00
Q3 2024	52,917	$10,257	$209.21	$188.78 - $238.00
Q2 2024	59,369	$13,763	$217.32	$189.44 - $237.54
Q1 2024	64,530	$13,915	$234.20	$211.02 - $268.30
Q4 2023	71,793	$18,578	$245.62	$220.86 - $269.43
Q3 2023	72,821	$18,716	$267.47	$251.85 - $287.60
Q2 2023	81,915	$23,333	$297.86	$273.39 - $319.76
Q1 2023	88,261	$24,539	$276.70	$254.80 - $295.90
Q4 2022	79,641	$22,054	$282.44	$250.31 - $311.88
Q3 2022	74,912	$20,002	$212.38	$193.65 - $283.44
Q2 2022	74,346	$15,162	$204.43	$187.16 - $225.50
Q1 2022	87,331	$18,392	$217.46	$192.67 - $249.00
Q4 2021	90,702	$21,761	$257.12	$221.72 - $290.76
Q3 2021	94,787	$26,824	$327.75	$282.64 - $372.12
Q2 2021	96,220	$33,318	$302.94	$257.03 - $468.55
Q1 2021	97,459	$27,264	$269.69	$238.40 - $296.38
Q4 2020	93,481	$22,890	$259.08	$223.25 - $363.92
Q3 2020	93,440	$26,507	$278.91	$261.87 - $312.00
Q2 2020	102,516	$27,428	$300.59	$257.60 - $350.24
Q1 2020	99,275	$31,409	$303.47	$262.25 - $374.99
Q4 2019	113,657	$33,725	$277.46	$219.70 - $318.00
Q3 2019	114,516	$26,662	$232.85	$215.78 - $246.99
Q2 2019	119,756	$28,007	$230.90	$219.20 - $245.35
Q1 2019	128,735	$30,430	$314.89	$216.12 - $344.00
Q4 2018	134,512	$40,477	$319.14	$278.46 - $358.41
Q3 2018	135,264	$47,790	$344.30	$288.13 - $388.67
Q2 2018	140,988	$40,920	$281.15	$249.17 - $310.91
Q1 2018	147,395	$40,360	$310.41	$259.76 - $370.57
Q4 2017	149,831	$47,732	$320.80	$301.81 - $348.84
Q3 2017	147,021	$46,035	$296.11	$269.50 - $330.00
Q2 2017	146,501	$39,755	$264.42	$244.28 - $291.90
Q1 2017	149,969	$41,005	$282.75	$260.50 - $301.42
Q4 2016	149,969	$43,136	$296.43	$268.00 - $329.83
Q3 2016	149,969	$46,945	$296.18	$240.07 - $333.65
Q2 2016	149,969	$36,266	$263.54	$223.02 - $292.69
Q1 2016	156,902	$40,845	$264.15	$242.07 - $301.02
Q4 2015	164,442	$50,377	$287.35	$254.00 - $311.65
Q3 2015	174,484	$50,916	$330.23	$265.00 - $412.24
Q2 2015	174,452	$70,468	$401.33	$368.88 - $432.88
Q1 2015	176,523	$74,535	$394.14	$334.40 - $480.18
Q4 2014	176,025	$59,752	$323.51	$290.85 - $361.93
Q3 2014	176,886	$58,516	$329.72	$298.31 - $349.00
Q2 2014	184,984	$58,327	$300.97	$272.02 - $322.25
Q1 2014	188,505	$57,658	$317.43	$270.62 - $358.89
Q4 2013	204,178	$57,119	$258.65	$221.07 - $298.82
Q3 2013	201,360	$48,479	$223.81	$203.55 - $248.95
Q2 2013	207,669	$44,690	$213.68	$191.80 - $242.64