BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q4 2025

Shares 960,645 Value ($000) $169,066 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 873,094 Value ($000) $122,293 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 928,496 Value ($000) $116,618 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 986,719 Value ($000) $135,040 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 1,022,024 Value ($000) $156,251 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 1,114,340 Value ($000) $216,010 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 1,110,112 Value ($000) $257,308 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 1,320,986 Value ($000) $284,844 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 1,424,659 Value ($000) $368,685 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 1,381,215 Value ($000) $355,004 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 1,345,742 Value ($000) $383,306 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 1,416,521 Value ($000) $393,801 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 1,343,232 Value ($000) $372 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 1,363,053 Value ($000) $363,909 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 1,250,454 Value ($000) $255,011 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 1,235,023 Value ($000) $260,103 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 1,192,250 Value ($000) $286,043 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 1,130,190 Value ($000) $319,872 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 1,187,688 Value ($000) $411,253 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 1,112,668 Value ($000) $311,210 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 1,116,551 Value ($000) $273,380 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 1,077,681 Value ($000) $305,678 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 1,067,505 Value ($000) $285,476 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 958,989 Value ($000) $303,373 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 835,322 Value ($000) $247,851 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 688,022 Value ($000) $160,139 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 677,325 Value ($000) $158,512 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 642,119 Value ($000) $151,772 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 642,476 Value ($000) $193,311 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 630,250 Value ($000) $222,680 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 631,293 Value ($000) $183,224 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 615,005 Value ($000) $168,401 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 565,696 Value ($000) $180,224 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 527,331 Value ($000) $165,106 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 518,627 Value ($000) $140,739 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 519,846 Value ($000) $142,117 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 531,702 Value ($000) $150,796 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 522,527 Value ($000) $163,540 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 514,568 Value ($000) $124,425 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 476,646 Value ($000) $124,056 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 418,648 Value ($000) $128,259 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 398,759 Value ($000) $116,328 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 372,303 Value ($000) $150,374 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 340,649 Value ($000) $143,849 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 330,616 Value ($000) $112,239 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 301,416 Value ($000) $99,714 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 278,279 Value ($000) $87,750 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 269,214 Value ($000) $82,357 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 248,889 Value ($000) $69,626 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 247,140 Value ($000) $59,507 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 239,965 Value ($000) $51,626 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	960,645	$169,066	$163.37	$138.00 - $185.17
Q3 2025	873,094	$122,293	$135.17	$121.05 - $150.28
Q2 2025	928,496	$116,618	$124.60	$110.04 - $137.32
Q1 2025	986,719	$135,040	$142.96	$128.51 - $157.09
Q4 2024	1,022,024	$156,251	$168.67	$145.07 - $195.00
Q3 2024	1,114,340	$216,010	$209.21	$188.78 - $238.00
Q2 2024	1,110,112	$257,308	$217.32	$189.44 - $237.54
Q1 2024	1,320,986	$284,844	$234.20	$211.02 - $268.30
Q4 2023	1,424,659	$368,685	$245.62	$220.86 - $269.43
Q3 2023	1,381,215	$355,004	$267.47	$251.85 - $287.60
Q2 2023	1,345,742	$383,306	$297.86	$273.39 - $319.76
Q1 2023	1,416,521	$393,801	$276.70	$254.80 - $295.90
Q4 2022	1,343,232	$372	$282.44	$250.31 - $311.88
Q3 2022	1,363,053	$363,909	$212.38	$193.65 - $283.44
Q2 2022	1,250,454	$255,011	$204.43	$187.16 - $225.50
Q1 2022	1,235,023	$260,103	$217.46	$192.67 - $249.00
Q4 2021	1,192,250	$286,043	$257.12	$221.72 - $290.76
Q3 2021	1,130,190	$319,872	$327.75	$282.64 - $372.12
Q2 2021	1,187,688	$411,253	$302.94	$257.03 - $468.55
Q1 2021	1,112,668	$311,210	$269.69	$238.40 - $296.38
Q4 2020	1,116,551	$273,380	$259.08	$223.25 - $363.92
Q3 2020	1,077,681	$305,678	$278.91	$261.87 - $312.00
Q2 2020	1,067,505	$285,476	$300.59	$257.60 - $350.24
Q1 2020	958,989	$303,373	$303.47	$262.25 - $374.99
Q4 2019	835,322	$247,851	$277.46	$219.70 - $318.00
Q3 2019	688,022	$160,139	$232.85	$215.78 - $246.99
Q2 2019	677,325	$158,512	$230.90	$219.20 - $245.35
Q1 2019	642,119	$151,772	$314.89	$216.12 - $344.00
Q4 2018	642,476	$193,311	$319.14	$278.46 - $358.41
Q3 2018	630,250	$222,680	$344.30	$288.13 - $388.67
Q2 2018	631,293	$183,224	$281.15	$249.17 - $310.91
Q1 2018	615,005	$168,401	$310.41	$259.76 - $370.57
Q4 2017	565,696	$180,224	$320.80	$301.81 - $348.84
Q3 2017	527,331	$165,106	$296.11	$269.50 - $330.00
Q2 2017	518,627	$140,739	$264.42	$244.28 - $291.90
Q1 2017	519,846	$142,117	$282.75	$260.50 - $301.42
Q4 2016	531,702	$150,796	$296.43	$268.00 - $329.83
Q3 2016	522,527	$163,540	$296.18	$240.07 - $333.65
Q2 2016	514,568	$124,425	$263.54	$223.02 - $292.69
Q1 2016	476,646	$124,056	$264.15	$242.07 - $301.02
Q4 2015	418,648	$128,259	$287.35	$254.00 - $311.65
Q3 2015	398,759	$116,328	$330.23	$265.00 - $412.24
Q2 2015	372,303	$150,374	$401.33	$368.88 - $432.88
Q1 2015	340,649	$143,849	$394.14	$334.40 - $480.18
Q4 2014	330,616	$112,239	$323.51	$290.85 - $361.93
Q3 2014	301,416	$99,714	$329.72	$298.31 - $349.00
Q2 2014	278,279	$87,750	$300.97	$272.02 - $322.25
Q1 2014	269,214	$82,357	$317.43	$270.62 - $358.89
Q4 2013	248,889	$69,626	$258.65	$221.07 - $298.82
Q3 2013	247,140	$59,507	$223.81	$203.55 - $248.95
Q2 2013	239,965	$51,626	$213.68	$191.80 - $242.64