BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Utah Retirement Systems's Holding History (CIK: 0001548392)

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

Q4 2025

Shares 23,996 Value ($000) $4,223 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 23,996 Value ($000) $3,361 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 23,996 Value ($000) $3,014 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 24,115 Value ($000) $3,300 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 24,115 Value ($000) $3,688 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 24,115 Value ($000) $4,674 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 24,015 Value ($000) $5,567 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 24,915 Value ($000) $5,372 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 24,915 Value ($000) $6,447 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 24,815 Value ($000) $6,378 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 24,766 Value ($000) $7,055 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 25,566 Value ($000) $7,108 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 25,466 Value ($000) $7,052 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 26,129 Value ($000) $6,977 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 26,029 Value ($000) $5,308 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 26,029 Value ($000) $5,482 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 26,529 Value ($000) $6,365 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 26,829 Value ($000) $7,593 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 28,529 Value ($000) $9,878 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 29,129 Value ($000) $8,148 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 30,729 Value ($000) $7,524 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 30,274 Value ($000) $8,588 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 30,974 Value ($000) $8,287 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 34,074 Value ($000) $10,781 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 34,374 Value ($000) $10,200 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 34,974 Value ($000) $8,143 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 36,774 Value ($000) $8,600 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 37,115 Value ($000) $8,773 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 37,514 Value ($000) $11,289 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 37,414 Value ($000) $13,219 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 39,014 Value ($000) $11,323 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 39,514 Value ($000) $10,820 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 39,414 Value ($000) $12,556 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 38,914 Value ($000) $12,185 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 38,914 Value ($000) $10,560 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 40,114 Value ($000) $10,968 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 40,114 Value ($000) $11,376 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 40,114 Value ($000) $12,557 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 40,114 Value ($000) $9,700 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 40,114 Value ($000) $10,443 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 40,114 Value ($000) $12,289 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 42,114 Value ($000) $12,289 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 41,914 Value ($000) $16,931 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 42,514 Value ($000) $17,951 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 41,114 Value ($000) $13,956 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 41,114 Value ($000) $13,601 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 41,214 Value ($000) $12,995 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 42,714 Value ($000) $13,065 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 42,314 Value ($000) $11,837 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 42,414 Value ($000) $10,212 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 42,714 Value ($000) $9,192 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	23,996	$4,223	$163.37	$138.00 - $185.17
Q3 2025	23,996	$3,361	$135.17	$121.05 - $150.28
Q2 2025	23,996	$3,014	$124.60	$110.04 - $137.32
Q1 2025	24,115	$3,300	$142.96	$128.51 - $157.09
Q4 2024	24,115	$3,688	$168.67	$145.07 - $195.00
Q3 2024	24,115	$4,674	$209.21	$188.78 - $238.00
Q2 2024	24,015	$5,567	$217.32	$189.44 - $237.54
Q1 2024	24,915	$5,372	$234.20	$211.02 - $268.30
Q4 2023	24,915	$6,447	$245.62	$220.86 - $269.43
Q3 2023	24,815	$6,378	$267.47	$251.85 - $287.60
Q2 2023	24,766	$7,055	$297.86	$273.39 - $319.76
Q1 2023	25,566	$7,108	$276.70	$254.80 - $295.90
Q4 2022	25,466	$7,052	$282.44	$250.31 - $311.88
Q3 2022	26,129	$6,977	$212.38	$193.65 - $283.44
Q2 2022	26,029	$5,308	$204.43	$187.16 - $225.50
Q1 2022	26,029	$5,482	$217.46	$192.67 - $249.00
Q4 2021	26,529	$6,365	$257.12	$221.72 - $290.76
Q3 2021	26,829	$7,593	$327.75	$282.64 - $372.12
Q2 2021	28,529	$9,878	$302.94	$257.03 - $468.55
Q1 2021	29,129	$8,148	$269.69	$238.40 - $296.38
Q4 2020	30,729	$7,524	$259.08	$223.25 - $363.92
Q3 2020	30,274	$8,588	$278.91	$261.87 - $312.00
Q2 2020	30,974	$8,287	$300.59	$257.60 - $350.24
Q1 2020	34,074	$10,781	$303.47	$262.25 - $374.99
Q4 2019	34,374	$10,200	$277.46	$219.70 - $318.00
Q3 2019	34,974	$8,143	$232.85	$215.78 - $246.99
Q2 2019	36,774	$8,600	$230.90	$219.20 - $245.35
Q1 2019	37,115	$8,773	$314.89	$216.12 - $344.00
Q4 2018	37,514	$11,289	$319.14	$278.46 - $358.41
Q3 2018	37,414	$13,219	$344.30	$288.13 - $388.67
Q2 2018	39,014	$11,323	$281.15	$249.17 - $310.91
Q1 2018	39,514	$10,820	$310.41	$259.76 - $370.57
Q4 2017	39,414	$12,556	$320.80	$301.81 - $348.84
Q3 2017	38,914	$12,185	$296.11	$269.50 - $330.00
Q2 2017	38,914	$10,560	$264.42	$244.28 - $291.90
Q1 2017	40,114	$10,968	$282.75	$260.50 - $301.42
Q4 2016	40,114	$11,376	$296.43	$268.00 - $329.83
Q3 2016	40,114	$12,557	$296.18	$240.07 - $333.65
Q2 2016	40,114	$9,700	$263.54	$223.02 - $292.69
Q1 2016	40,114	$10,443	$264.15	$242.07 - $301.02
Q4 2015	40,114	$12,289	$287.35	$254.00 - $311.65
Q3 2015	42,114	$12,289	$330.23	$265.00 - $412.24
Q2 2015	41,914	$16,931	$401.33	$368.88 - $432.88
Q1 2015	42,514	$17,951	$394.14	$334.40 - $480.18
Q4 2014	41,114	$13,956	$323.51	$290.85 - $361.93
Q3 2014	41,114	$13,601	$329.72	$298.31 - $349.00
Q2 2014	41,214	$12,995	$300.97	$272.02 - $322.25
Q1 2014	42,714	$13,065	$317.43	$270.62 - $358.89
Q4 2013	42,314	$11,837	$258.65	$221.07 - $298.82
Q3 2013	42,414	$10,212	$223.81	$203.55 - $248.95
Q2 2013	42,714	$9,192	$213.68	$191.80 - $242.64