BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Louisiana State Employees Retirement System's Holding History (CIK: 0001537191)

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

Q4 2025

Shares 7,500 Value ($000) $1,320 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 18,400 Value ($000) $2,577 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 18,400 Value ($000) $2,311 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 18,600 Value ($000) $2,545 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 18,400 Value ($000) $2,814 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 19,300 Value ($000) $3,741 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 19,800 Value ($000) $4,590 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 19,800 Value ($000) $4,269 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 20,300 Value ($000) $5,253 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 20,500 Value ($000) $5,269 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 18,000 Value ($000) $5,127 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 16,600 Value ($000) $4,615 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 16,500 Value ($000) $5 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 17,100 Value ($000) $4,566 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 17,100 Value ($000) $3,766 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 17,100 Value ($000) $3,769 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 17,000 Value ($000) $4,078 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 17,000 Value ($000) $4,811 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 17,200 Value ($000) $5,956 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 17,300 Value ($000) $4,840 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 16,300 Value ($000) $3,992 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 8,000 Value ($000) $2,269 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 7,000 Value ($000) $1,873 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 7,700 Value ($000) $2,436 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 8,600 Value ($000) $2,552 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 8,900 Value ($000) $2,072 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 9,700 Value ($000) $2,245 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 10,400 Value ($000) $2,458 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 10,600 Value ($000) $3,190 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 11,800 Value ($000) $4,169 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 12,400 Value ($000) $3,599 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 12,900 Value ($000) $3,532 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 12,800 Value ($000) $4,078 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 13,200 Value ($000) $4,133 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 13,300 Value ($000) $3,609 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 13,300 Value ($000) $3,636 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 13,700 Value ($000) $3,885 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 13,900 Value ($000) $4,351 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 14,400 Value ($000) $3,482 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 14,600 Value ($000) $3,801 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 15,600 Value ($000) $4,779 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 17,200 Value ($000) $5,019 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 17,100 Value ($000) $6,907 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 16,900 Value ($000) $7,136 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 17,800 Value ($000) $6,042 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 18,100 Value ($000) $5,988 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 18,600 Value ($000) $5,865 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 18,700 Value ($000) $5,720 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 19,000 Value ($000) $5,312 Avg Close $258.65 Range $221.07 - $298.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	7,500	$1,320	$163.37	$138.00 - $185.17
Q3 2025	18,400	$2,577	$135.17	$121.05 - $150.28
Q2 2025	18,400	$2,311	$124.60	$110.04 - $137.32
Q1 2025	18,600	$2,545	$142.96	$128.51 - $157.09
Q4 2024	18,400	$2,814	$168.67	$145.07 - $195.00
Q3 2024	19,300	$3,741	$209.21	$188.78 - $238.00
Q2 2024	19,800	$4,590	$217.32	$189.44 - $237.54
Q1 2024	19,800	$4,269	$234.20	$211.02 - $268.30
Q4 2023	20,300	$5,253	$245.62	$220.86 - $269.43
Q3 2023	20,500	$5,269	$267.47	$251.85 - $287.60
Q2 2023	18,000	$5,127	$297.86	$273.39 - $319.76
Q1 2023	16,600	$4,615	$276.70	$254.80 - $295.90
Q4 2022	16,500	$5	$282.44	$250.31 - $311.88
Q3 2022	17,100	$4,566	$212.38	$193.65 - $283.44
Q2 2022	17,100	$3,766	$204.43	$187.16 - $225.50
Q1 2022	17,100	$3,769	$217.46	$192.67 - $249.00
Q4 2021	17,000	$4,078	$257.12	$221.72 - $290.76
Q3 2021	17,000	$4,811	$327.75	$282.64 - $372.12
Q2 2021	17,200	$5,956	$302.94	$257.03 - $468.55
Q1 2021	17,300	$4,840	$269.69	$238.40 - $296.38
Q4 2020	16,300	$3,992	$259.08	$223.25 - $363.92
Q3 2020	8,000	$2,269	$278.91	$261.87 - $312.00
Q2 2020	7,000	$1,873	$300.59	$257.60 - $350.24
Q1 2020	7,700	$2,436	$303.47	$262.25 - $374.99
Q4 2019	8,600	$2,552	$277.46	$219.70 - $318.00
Q3 2019	8,900	$2,072	$232.85	$215.78 - $246.99
Q2 2019	9,700	$2,245	$230.90	$219.20 - $245.35
Q1 2019	10,400	$2,458	$314.89	$216.12 - $344.00
Q4 2018	10,600	$3,190	$319.14	$278.46 - $358.41
Q3 2018	11,800	$4,169	$344.30	$288.13 - $388.67
Q2 2018	12,400	$3,599	$281.15	$249.17 - $310.91
Q1 2018	12,900	$3,532	$310.41	$259.76 - $370.57
Q4 2017	12,800	$4,078	$320.80	$301.81 - $348.84
Q3 2017	13,200	$4,133	$296.11	$269.50 - $330.00
Q2 2017	13,300	$3,609	$264.42	$244.28 - $291.90
Q1 2017	13,300	$3,636	$282.75	$260.50 - $301.42
Q4 2016	13,700	$3,885	$296.43	$268.00 - $329.83
Q3 2016	13,900	$4,351	$296.18	$240.07 - $333.65
Q2 2016	14,400	$3,482	$263.54	$223.02 - $292.69
Q1 2016	14,600	$3,801	$264.15	$242.07 - $301.02
Q4 2015	15,600	$4,779	$287.35	$254.00 - $311.65
Q3 2015	17,200	$5,019	$330.23	$265.00 - $412.24
Q2 2015	17,100	$6,907	$401.33	$368.88 - $432.88
Q1 2015	16,900	$7,136	$394.14	$334.40 - $480.18
Q4 2014	17,800	$6,042	$323.51	$290.85 - $361.93
Q3 2014	18,100	$5,988	$329.72	$298.31 - $349.00
Q2 2014	18,600	$5,865	$300.97	$272.02 - $322.25
Q1 2014	18,700	$5,720	$317.43	$270.62 - $358.89
Q4 2013	19,000	$5,312	$258.65	$221.07 - $298.82