BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Korea Investment CORP's Holding History (CIK: 0001441689)

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

Q4 2025

Shares 53,907 Value ($000) $9,487 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 60,408 Value ($000) $8,462 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 61,508 Value ($000) $7,725 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 66,408 Value ($000) $9,087 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 60,108 Value ($000) $9,192 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 62,208 Value ($000) $12,058 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 95,417 Value ($000) $22,120 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 140,871 Value ($000) $30,376 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 175,795 Value ($000) $45,490 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 144,136 Value ($000) $37,044 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 147,379 Value ($000) $41,981 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 167,794 Value ($000) $46,652 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 185,038 Value ($000) $51,241 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 269,539 Value ($000) $71,967 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 228,271 Value ($000) $46,554 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 172,424 Value ($000) $36,312 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 98,240 Value ($000) $23,570 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 119,714 Value ($000) $33,878 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 141,971 Value ($000) $49,160 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 101,541 Value ($000) $28,406 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 225,982 Value ($000) $55,334 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 190,103 Value ($000) $53,928 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 200,403 Value ($000) $53,618 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 189,103 Value ($000) $59,828 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 212,303 Value ($000) $62,997 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 201,203 Value ($000) $46,844 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 189,403 Value ($000) $44,296 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 176,803 Value ($000) $41,793 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 181,357 Value ($000) $54,574 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 190,557 Value ($000) $67,326 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 186,724 Value ($000) $54,195 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 192,424 Value ($000) $52,690 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 197,833 Value ($000) $63,024 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 185,833 Value ($000) $58,188 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 146,533 Value ($000) $39,763 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 154,453 Value ($000) $42,231 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 333,925 Value ($000) $94,694 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 301,766 Value ($000) $94,462 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 295,712 Value ($000) $71,509 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 241,912 Value ($000) $62,974 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 232,412 Value ($000) $71,199 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 188,712 Value ($000) $55,068 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 127,500 Value ($000) $51,502 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 150,700 Value ($000) $63,632 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 169,700 Value ($000) $57,605 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 122,900 Value ($000) $40,657 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 118,700 Value ($000) $37,427 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 114,200 Value ($000) $34,930 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 97,000 Value ($000) $27,136 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 93,300 Value ($000) $22,463 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 98,100 Value ($000) $21,111 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	53,907	$9,487	$163.37	$138.00 - $185.17
Q3 2025	60,408	$8,462	$135.17	$121.05 - $150.28
Q2 2025	61,508	$7,725	$124.60	$110.04 - $137.32
Q1 2025	66,408	$9,087	$142.96	$128.51 - $157.09
Q4 2024	60,108	$9,192	$168.67	$145.07 - $195.00
Q3 2024	62,208	$12,058	$209.21	$188.78 - $238.00
Q2 2024	95,417	$22,120	$217.32	$189.44 - $237.54
Q1 2024	140,871	$30,376	$234.20	$211.02 - $268.30
Q4 2023	175,795	$45,490	$245.62	$220.86 - $269.43
Q3 2023	144,136	$37,044	$267.47	$251.85 - $287.60
Q2 2023	147,379	$41,981	$297.86	$273.39 - $319.76
Q1 2023	167,794	$46,652	$276.70	$254.80 - $295.90
Q4 2022	185,038	$51,241	$282.44	$250.31 - $311.88
Q3 2022	269,539	$71,967	$212.38	$193.65 - $283.44
Q2 2022	228,271	$46,554	$204.43	$187.16 - $225.50
Q1 2022	172,424	$36,312	$217.46	$192.67 - $249.00
Q4 2021	98,240	$23,570	$257.12	$221.72 - $290.76
Q3 2021	119,714	$33,878	$327.75	$282.64 - $372.12
Q2 2021	141,971	$49,160	$302.94	$257.03 - $468.55
Q1 2021	101,541	$28,406	$269.69	$238.40 - $296.38
Q4 2020	225,982	$55,334	$259.08	$223.25 - $363.92
Q3 2020	190,103	$53,928	$278.91	$261.87 - $312.00
Q2 2020	200,403	$53,618	$300.59	$257.60 - $350.24
Q1 2020	189,103	$59,828	$303.47	$262.25 - $374.99
Q4 2019	212,303	$62,997	$277.46	$219.70 - $318.00
Q3 2019	201,203	$46,844	$232.85	$215.78 - $246.99
Q2 2019	189,403	$44,296	$230.90	$219.20 - $245.35
Q1 2019	176,803	$41,793	$314.89	$216.12 - $344.00
Q4 2018	181,357	$54,574	$319.14	$278.46 - $358.41
Q3 2018	190,557	$67,326	$344.30	$288.13 - $388.67
Q2 2018	186,724	$54,195	$281.15	$249.17 - $310.91
Q1 2018	192,424	$52,690	$310.41	$259.76 - $370.57
Q4 2017	197,833	$63,024	$320.80	$301.81 - $348.84
Q3 2017	185,833	$58,188	$296.11	$269.50 - $330.00
Q2 2017	146,533	$39,763	$264.42	$244.28 - $291.90
Q1 2017	154,453	$42,231	$282.75	$260.50 - $301.42
Q4 2016	333,925	$94,694	$296.43	$268.00 - $329.83
Q3 2016	301,766	$94,462	$296.18	$240.07 - $333.65
Q2 2016	295,712	$71,509	$263.54	$223.02 - $292.69
Q1 2016	241,912	$62,974	$264.15	$242.07 - $301.02
Q4 2015	232,412	$71,199	$287.35	$254.00 - $311.65
Q3 2015	188,712	$55,068	$330.23	$265.00 - $412.24
Q2 2015	127,500	$51,502	$401.33	$368.88 - $432.88
Q1 2015	150,700	$63,632	$394.14	$334.40 - $480.18
Q4 2014	169,700	$57,605	$323.51	$290.85 - $361.93
Q3 2014	122,900	$40,657	$329.72	$298.31 - $349.00
Q2 2014	118,700	$37,427	$300.97	$272.02 - $322.25
Q1 2014	114,200	$34,930	$317.43	$270.62 - $358.89
Q4 2013	97,000	$27,136	$258.65	$221.07 - $298.82
Q3 2013	93,300	$22,463	$223.81	$203.55 - $248.95
Q2 2013	98,100	$21,111	$213.68	$191.80 - $242.64