BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

COUNTRY TRUST BANK's Holding History (CIK: 0001209324)

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

Q4 2025

Shares 2 Value ($000) $0 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 2 Value ($000) $0 Avg Close $135.17 Range $121.05 - $150.28

Q3 2021

Shares 74 Value ($000) $21 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 97,006 Value ($000) $33,590 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 116,670 Value ($000) $32,638 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 91,065 Value ($000) $22,298 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 95,118 Value ($000) $26,983 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 97,775 Value ($000) $26,160 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 95,143 Value ($000) $30,101 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 86,674 Value ($000) $25,719 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 102,768 Value ($000) $23,926 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 109,103 Value ($000) $25,516 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 108,719 Value ($000) $25,699 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 112,718 Value ($000) $33,919 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 107,132 Value ($000) $37,851 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 119,960 Value ($000) $34,817 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 97,989 Value ($000) $26,831 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 108,588 Value ($000) $34,593 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 105,610 Value ($000) $33,069 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 93,676 Value ($000) $25,420 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 89,818 Value ($000) $24,558 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 87,435 Value ($000) $24,795 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 89,404 Value ($000) $27,986 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 83,044 Value ($000) $20,082 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 76,441 Value ($000) $19,899 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 23,688 Value ($000) $7,257 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 18,545 Value ($000) $5,412 Avg Close $330.23 Range $265.00 - $412.24

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2	$0	$163.37	$138.00 - $185.17
Q3 2025	2	$0	$135.17	$121.05 - $150.28
Q3 2021	74	$21	$327.75	$282.64 - $372.12
Q2 2021	97,006	$33,590	$302.94	$257.03 - $468.55
Q1 2021	116,670	$32,638	$269.69	$238.40 - $296.38
Q4 2020	91,065	$22,298	$259.08	$223.25 - $363.92
Q3 2020	95,118	$26,983	$278.91	$261.87 - $312.00
Q2 2020	97,775	$26,160	$300.59	$257.60 - $350.24
Q1 2020	95,143	$30,101	$303.47	$262.25 - $374.99
Q4 2019	86,674	$25,719	$277.46	$219.70 - $318.00
Q3 2019	102,768	$23,926	$232.85	$215.78 - $246.99
Q2 2019	109,103	$25,516	$230.90	$219.20 - $245.35
Q1 2019	108,719	$25,699	$314.89	$216.12 - $344.00
Q4 2018	112,718	$33,919	$319.14	$278.46 - $358.41
Q3 2018	107,132	$37,851	$344.30	$288.13 - $388.67
Q2 2018	119,960	$34,817	$281.15	$249.17 - $310.91
Q1 2018	97,989	$26,831	$310.41	$259.76 - $370.57
Q4 2017	108,588	$34,593	$320.80	$301.81 - $348.84
Q3 2017	105,610	$33,069	$296.11	$269.50 - $330.00
Q2 2017	93,676	$25,420	$264.42	$244.28 - $291.90
Q1 2017	89,818	$24,558	$282.75	$260.50 - $301.42
Q4 2016	87,435	$24,795	$296.43	$268.00 - $329.83
Q3 2016	89,404	$27,986	$296.18	$240.07 - $333.65
Q2 2016	83,044	$20,082	$263.54	$223.02 - $292.69
Q1 2016	76,441	$19,899	$264.15	$242.07 - $301.02
Q4 2015	23,688	$7,257	$287.35	$254.00 - $311.65
Q3 2015	18,545	$5,412	$330.23	$265.00 - $412.24