BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Employees Retirement System of Texas's Holding History (CIK: 0001398739)

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

Q2 2025

Shares 1,467 Value ($000) $0 Avg Close $124.60 Range $110.04 - $137.32

Q2 2023

Shares 108,000 Value ($000) $31 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 73,000 Value ($000) $20 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 100,000 Value ($000) $28 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 85,000 Value ($000) $22,695 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 28,800 Value ($000) $5,873 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 28,800 Value ($000) $6,065 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 23,800 Value ($000) $5,710 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 20,800 Value ($000) $5,886 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 22,900 Value ($000) $7,930 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 31,800 Value ($000) $8,896 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 33,800 Value ($000) $8,276 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 33,800 Value ($000) $9,588 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 35,800 Value ($000) $9,578 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 20,800 Value ($000) $6,581 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 20,800 Value ($000) $6,172 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 26,800 Value ($000) $6,240 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 53,000 Value ($000) $12,395 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 54,000 Value ($000) $12,765 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 72,000 Value ($000) $21,666 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 73,400 Value ($000) $25,933 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 53,700 Value ($000) $15,586 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 61,700 Value ($000) $16,895 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 72,900 Value ($000) $23,224 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 75,300 Value ($000) $23,578 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 72,800 Value ($000) $19,755 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 88,800 Value ($000) $24,280 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 87,500 Value ($000) $24,813 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 48,900 Value ($000) $15,307 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 30,900 Value ($000) $7,472 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 23,900 Value ($000) $6,222 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 12,900 Value ($000) $3,952 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 19,200 Value ($000) $5,603 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 38,100 Value ($000) $15,390 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 33,100 Value ($000) $13,976 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 89,100 Value ($000) $30,245 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 78,100 Value ($000) $25,836 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 65,830 Value ($000) $20,757 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 94,000 Value ($000) $28,752 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 81,000 Value ($000) $22,660 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 76,530 Value ($000) $18,425 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 87,000 Value ($000) $18,722 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2025	1,467	$0	$124.60	$110.04 - $137.32
Q2 2023	108,000	$31	$297.86	$273.39 - $319.76
Q1 2023	73,000	$20	$276.70	$254.80 - $295.90
Q4 2022	100,000	$28	$282.44	$250.31 - $311.88
Q3 2022	85,000	$22,695	$212.38	$193.65 - $283.44
Q2 2022	28,800	$5,873	$204.43	$187.16 - $225.50
Q1 2022	28,800	$6,065	$217.46	$192.67 - $249.00
Q4 2021	23,800	$5,710	$257.12	$221.72 - $290.76
Q3 2021	20,800	$5,886	$327.75	$282.64 - $372.12
Q2 2021	22,900	$7,930	$302.94	$257.03 - $468.55
Q1 2021	31,800	$8,896	$269.69	$238.40 - $296.38
Q4 2020	33,800	$8,276	$259.08	$223.25 - $363.92
Q3 2020	33,800	$9,588	$278.91	$261.87 - $312.00
Q2 2020	35,800	$9,578	$300.59	$257.60 - $350.24
Q1 2020	20,800	$6,581	$303.47	$262.25 - $374.99
Q4 2019	20,800	$6,172	$277.46	$219.70 - $318.00
Q3 2019	26,800	$6,240	$232.85	$215.78 - $246.99
Q2 2019	53,000	$12,395	$230.90	$219.20 - $245.35
Q1 2019	54,000	$12,765	$314.89	$216.12 - $344.00
Q4 2018	72,000	$21,666	$319.14	$278.46 - $358.41
Q3 2018	73,400	$25,933	$344.30	$288.13 - $388.67
Q2 2018	53,700	$15,586	$281.15	$249.17 - $310.91
Q1 2018	61,700	$16,895	$310.41	$259.76 - $370.57
Q4 2017	72,900	$23,224	$320.80	$301.81 - $348.84
Q3 2017	75,300	$23,578	$296.11	$269.50 - $330.00
Q2 2017	72,800	$19,755	$264.42	$244.28 - $291.90
Q1 2017	88,800	$24,280	$282.75	$260.50 - $301.42
Q4 2016	87,500	$24,813	$296.43	$268.00 - $329.83
Q3 2016	48,900	$15,307	$296.18	$240.07 - $333.65
Q2 2016	30,900	$7,472	$263.54	$223.02 - $292.69
Q1 2016	23,900	$6,222	$264.15	$242.07 - $301.02
Q4 2015	12,900	$3,952	$287.35	$254.00 - $311.65
Q3 2015	19,200	$5,603	$330.23	$265.00 - $412.24
Q2 2015	38,100	$15,390	$401.33	$368.88 - $432.88
Q1 2015	33,100	$13,976	$394.14	$334.40 - $480.18
Q4 2014	89,100	$30,245	$323.51	$290.85 - $361.93
Q3 2014	78,100	$25,836	$329.72	$298.31 - $349.00
Q2 2014	65,830	$20,757	$300.97	$272.02 - $322.25
Q1 2014	94,000	$28,752	$317.43	$270.62 - $358.89
Q4 2013	81,000	$22,660	$258.65	$221.07 - $298.82
Q3 2013	76,530	$18,425	$223.81	$203.55 - $248.95
Q2 2013	87,000	$18,722	$213.68	$191.80 - $242.64