BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

CHARLES SCHWAB INVESTMENT MANAGEMENT INC's Holding History (CIK: 0000884546)

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

Q4 2025

Shares 1,143,902 Value ($000) $201,315 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 1,123,349 Value ($000) $157,359 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 1,075,757 Value ($000) $135,104 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 1,019,219 Value ($000) $139,470 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 971,263 Value ($000) $148,526 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 913,029 Value ($000) $176,982 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 900,710 Value ($000) $208,802 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 858,805 Value ($000) $185,184 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 849,000 Value ($000) $219,696 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 848,690 Value ($000) $218,122 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 850,201 Value ($000) $242,180 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 844,382 Value ($000) $234,764 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 836,294 Value ($000) $231,587 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 820,568 Value ($000) $219,092 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 789,884 Value ($000) $161,089 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 764,760 Value ($000) $161,059 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 741,737 Value ($000) $177,958 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 731,198 Value ($000) $206,922 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 723,829 Value ($000) $250,641 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 704,264 Value ($000) $197,018 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 710,402 Value ($000) $173,950 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 735,080 Value ($000) $208,528 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 825,710 Value ($000) $220,919 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 937,798 Value ($000) $296,701 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 934,331 Value ($000) $277,245 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 967,870 Value ($000) $225,340 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 931,237 Value ($000) $217,789 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 916,318 Value ($000) $216,600 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 909,374 Value ($000) $273,649 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 888,053 Value ($000) $313,759 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 920,587 Value ($000) $267,192 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 892,147 Value ($000) $244,288 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 832,638 Value ($000) $265,274 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 776,305 Value ($000) $243,077 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 798,469 Value ($000) $216,673 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 839,640 Value ($000) $229,575 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 778,886 Value ($000) $220,877 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 745,442 Value ($000) $233,108 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 648,540 Value ($000) $156,830 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 633,567 Value ($000) $164,931 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 637,860 Value ($000) $195,409 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 661,733 Value ($000) $193,101 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 707,562 Value ($000) $285,813 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 695,357 Value ($000) $293,608 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 662,335 Value ($000) $224,830 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 647,326 Value ($000) $214,142 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 611,297 Value ($000) $192,749 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 622,938 Value ($000) $190,539 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 599,515 Value ($000) $167,715 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 581,312 Value ($000) $142,375 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 510,246 Value ($000) $111,170 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,143,902	$201,315	$163.37	$138.00 - $185.17
Q3 2025	1,123,349	$157,359	$135.17	$121.05 - $150.28
Q2 2025	1,075,757	$135,104	$124.60	$110.04 - $137.32
Q1 2025	1,019,219	$139,470	$142.96	$128.51 - $157.09
Q4 2024	971,263	$148,526	$168.67	$145.07 - $195.00
Q3 2024	913,029	$176,982	$209.21	$188.78 - $238.00
Q2 2024	900,710	$208,802	$217.32	$189.44 - $237.54
Q1 2024	858,805	$185,184	$234.20	$211.02 - $268.30
Q4 2023	849,000	$219,696	$245.62	$220.86 - $269.43
Q3 2023	848,690	$218,122	$267.47	$251.85 - $287.60
Q2 2023	850,201	$242,180	$297.86	$273.39 - $319.76
Q1 2023	844,382	$234,764	$276.70	$254.80 - $295.90
Q4 2022	836,294	$231,587	$282.44	$250.31 - $311.88
Q3 2022	820,568	$219,092	$212.38	$193.65 - $283.44
Q2 2022	789,884	$161,089	$204.43	$187.16 - $225.50
Q1 2022	764,760	$161,059	$217.46	$192.67 - $249.00
Q4 2021	741,737	$177,958	$257.12	$221.72 - $290.76
Q3 2021	731,198	$206,922	$327.75	$282.64 - $372.12
Q2 2021	723,829	$250,641	$302.94	$257.03 - $468.55
Q1 2021	704,264	$197,018	$269.69	$238.40 - $296.38
Q4 2020	710,402	$173,950	$259.08	$223.25 - $363.92
Q3 2020	735,080	$208,528	$278.91	$261.87 - $312.00
Q2 2020	825,710	$220,919	$300.59	$257.60 - $350.24
Q1 2020	937,798	$296,701	$303.47	$262.25 - $374.99
Q4 2019	934,331	$277,245	$277.46	$219.70 - $318.00
Q3 2019	967,870	$225,340	$232.85	$215.78 - $246.99
Q2 2019	931,237	$217,789	$230.90	$219.20 - $245.35
Q1 2019	916,318	$216,600	$314.89	$216.12 - $344.00
Q4 2018	909,374	$273,649	$319.14	$278.46 - $358.41
Q3 2018	888,053	$313,759	$344.30	$288.13 - $388.67
Q2 2018	920,587	$267,192	$281.15	$249.17 - $310.91
Q1 2018	892,147	$244,288	$310.41	$259.76 - $370.57
Q4 2017	832,638	$265,274	$320.80	$301.81 - $348.84
Q3 2017	776,305	$243,077	$296.11	$269.50 - $330.00
Q2 2017	798,469	$216,673	$264.42	$244.28 - $291.90
Q1 2017	839,640	$229,575	$282.75	$260.50 - $301.42
Q4 2016	778,886	$220,877	$296.43	$268.00 - $329.83
Q3 2016	745,442	$233,108	$296.18	$240.07 - $333.65
Q2 2016	648,540	$156,830	$263.54	$223.02 - $292.69
Q1 2016	633,567	$164,931	$264.15	$242.07 - $301.02
Q4 2015	637,860	$195,409	$287.35	$254.00 - $311.65
Q3 2015	661,733	$193,101	$330.23	$265.00 - $412.24
Q2 2015	707,562	$285,813	$401.33	$368.88 - $432.88
Q1 2015	695,357	$293,608	$394.14	$334.40 - $480.18
Q4 2014	662,335	$224,830	$323.51	$290.85 - $361.93
Q3 2014	647,326	$214,142	$329.72	$298.31 - $349.00
Q2 2014	611,297	$192,749	$300.97	$272.02 - $322.25
Q1 2014	622,938	$190,539	$317.43	$270.62 - $358.89
Q4 2013	599,515	$167,715	$258.65	$221.07 - $298.82
Q3 2013	581,312	$142,375	$223.81	$203.55 - $248.95
Q2 2013	510,246	$111,170	$213.68	$191.80 - $242.64