BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

AMERICAN CENTURY COMPANIES INC's Holding History (CIK: 0000748054)

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

Q4 2025

Shares 85,824 Value ($000) $15,104 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 70,393 Value ($000) $9,861 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 81,253 Value ($000) $10,205 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 60,475 Value ($000) $8,275 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 115,374 Value ($000) $17,643 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 216,978 Value ($000) $42,059 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 821,301 Value ($000) $190,394 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 842,467 Value ($000) $181,661 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 988,676 Value ($000) $255,840 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 898,928 Value ($000) $231,033 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 698,618 Value ($000) $199,001 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 373,188 Value ($000) $103,727 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 383,614 Value ($000) $106,230 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 291,821 Value ($000) $77,917 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 428,099 Value ($000) $87,306 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 879,802 Value ($000) $185,286 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 855,772 Value ($000) $205,317 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 1,138,819 Value ($000) $322,275 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 1,242,043 Value ($000) $430,082 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 983,826 Value ($000) $275,226 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 976,022 Value ($000) $238,989 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 1,068,008 Value ($000) $302,973 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 1,032,642 Value ($000) $276,283 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 1,281,956 Value ($000) $405,585 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 1,314,911 Value ($000) $390,173 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 1,447,074 Value ($000) $336,908 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 1,443,266 Value ($000) $337,537 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 1,643,414 Value ($000) $388,470 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 1,668,478 Value ($000) $502,078 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 1,507,871 Value ($000) $532,746 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 1,141,510 Value ($000) $331,312 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 1,171,329 Value ($000) $320,733 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 1,001,387 Value ($000) $319,012 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 905,955 Value ($000) $283,673 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,087,357 Value ($000) $295,065 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 1,078,876 Value ($000) $294,986 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 997,349 Value ($000) $282,828 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 1,036,681 Value ($000) $324,512 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 1,149,941 Value ($000) $278,079 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 1,303,230 Value ($000) $339,257 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 1,407,285 Value ($000) $431,122 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 1,408,665 Value ($000) $411,063 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 1,338,718 Value ($000) $540,762 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 1,680,454 Value ($000) $709,555 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 1,910,158 Value ($000) $648,403 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 1,716,749 Value ($000) $567,918 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 1,400,653 Value ($000) $441,640 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 958,847 Value ($000) $293,283 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 914,816 Value ($000) $255,920 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 824,709 Value ($000) $198,557 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 616,126 Value ($000) $132,590 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	85,824	$15,104	$163.37	$138.00 - $185.17
Q3 2025	70,393	$9,861	$135.17	$121.05 - $150.28
Q2 2025	81,253	$10,205	$124.60	$110.04 - $137.32
Q1 2025	60,475	$8,275	$142.96	$128.51 - $157.09
Q4 2024	115,374	$17,643	$168.67	$145.07 - $195.00
Q3 2024	216,978	$42,059	$209.21	$188.78 - $238.00
Q2 2024	821,301	$190,394	$217.32	$189.44 - $237.54
Q1 2024	842,467	$181,661	$234.20	$211.02 - $268.30
Q4 2023	988,676	$255,840	$245.62	$220.86 - $269.43
Q3 2023	898,928	$231,033	$267.47	$251.85 - $287.60
Q2 2023	698,618	$199,001	$297.86	$273.39 - $319.76
Q1 2023	373,188	$103,727	$276.70	$254.80 - $295.90
Q4 2022	383,614	$106,230	$282.44	$250.31 - $311.88
Q3 2022	291,821	$77,917	$212.38	$193.65 - $283.44
Q2 2022	428,099	$87,306	$204.43	$187.16 - $225.50
Q1 2022	879,802	$185,286	$217.46	$192.67 - $249.00
Q4 2021	855,772	$205,317	$257.12	$221.72 - $290.76
Q3 2021	1,138,819	$322,275	$327.75	$282.64 - $372.12
Q2 2021	1,242,043	$430,082	$302.94	$257.03 - $468.55
Q1 2021	983,826	$275,226	$269.69	$238.40 - $296.38
Q4 2020	976,022	$238,989	$259.08	$223.25 - $363.92
Q3 2020	1,068,008	$302,973	$278.91	$261.87 - $312.00
Q2 2020	1,032,642	$276,283	$300.59	$257.60 - $350.24
Q1 2020	1,281,956	$405,585	$303.47	$262.25 - $374.99
Q4 2019	1,314,911	$390,173	$277.46	$219.70 - $318.00
Q3 2019	1,447,074	$336,908	$232.85	$215.78 - $246.99
Q2 2019	1,443,266	$337,537	$230.90	$219.20 - $245.35
Q1 2019	1,643,414	$388,470	$314.89	$216.12 - $344.00
Q4 2018	1,668,478	$502,078	$319.14	$278.46 - $358.41
Q3 2018	1,507,871	$532,746	$344.30	$288.13 - $388.67
Q2 2018	1,141,510	$331,312	$281.15	$249.17 - $310.91
Q1 2018	1,171,329	$320,733	$310.41	$259.76 - $370.57
Q4 2017	1,001,387	$319,012	$320.80	$301.81 - $348.84
Q3 2017	905,955	$283,673	$296.11	$269.50 - $330.00
Q2 2017	1,087,357	$295,065	$264.42	$244.28 - $291.90
Q1 2017	1,078,876	$294,986	$282.75	$260.50 - $301.42
Q4 2016	997,349	$282,828	$296.43	$268.00 - $329.83
Q3 2016	1,036,681	$324,512	$296.18	$240.07 - $333.65
Q2 2016	1,149,941	$278,079	$263.54	$223.02 - $292.69
Q1 2016	1,303,230	$339,257	$264.15	$242.07 - $301.02
Q4 2015	1,407,285	$431,122	$287.35	$254.00 - $311.65
Q3 2015	1,408,665	$411,063	$330.23	$265.00 - $412.24
Q2 2015	1,338,718	$540,762	$401.33	$368.88 - $432.88
Q1 2015	1,680,454	$709,555	$394.14	$334.40 - $480.18
Q4 2014	1,910,158	$648,403	$323.51	$290.85 - $361.93
Q3 2014	1,716,749	$567,918	$329.72	$298.31 - $349.00
Q2 2014	1,400,653	$441,640	$300.97	$272.02 - $322.25
Q1 2014	958,847	$293,283	$317.43	$270.62 - $358.89
Q4 2013	914,816	$255,920	$258.65	$221.07 - $298.82
Q3 2013	824,709	$198,557	$223.81	$203.55 - $248.95
Q2 2013	616,126	$132,590	$213.68	$191.80 - $242.64