BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Robeco Institutional Asset Management B.V.'s Holding History (CIK: 0001418773)

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

Q4 2025

Shares 610,908 Value ($000) $107,514 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 671,054 Value ($000) $94,001 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 448,757 Value ($000) $56,359 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 453,529 Value ($000) $62,061 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 408,276 Value ($000) $62,434 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 274,708 Value ($000) $53,249 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 214,937 Value ($000) $49,827 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 231,516 Value ($000) $49,922 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 293,540 Value ($000) $75,959 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 341,810 Value ($000) $87,849 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 343,217 Value ($000) $97,765 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 361,447 Value ($000) $100,493 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 313,157 Value ($000) $86,719 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 307,816 Value ($000) $82,186 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 181,511 Value ($000) $37,017 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 177,596 Value ($000) $37,403 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 191,265 Value ($000) $45,890 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 172,161 Value ($000) $48,722 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 164,445 Value ($000) $56,939 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 275,589 Value ($000) $77,093 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 324,499 Value ($000) $79,458 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 563,066 Value ($000) $159,728 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 402,658 Value ($000) $107,729 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 259,448 Value ($000) $82,083 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 220,041 Value ($000) $65,293 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 237,355 Value ($000) $55,265 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 303,431 Value ($000) $70,963 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 451,657 Value ($000) $106,762 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 375,027 Value ($000) $112,766 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 364,516 Value ($000) $128,788 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 417,161 Value ($000) $121,078 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 430,838 Value ($000) $117,973 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 291,276 Value ($000) $92,792 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 151,747 Value ($000) $47,515 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 151,631 Value ($000) $41,146 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 155,703 Value ($000) $42,572 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 144,033 Value ($000) $40,846 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 215,796 Value ($000) $67,551 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 240,951 Value ($000) $58,265 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 234,381 Value ($000) $61,015 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 189,196 Value ($000) $57,960 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 156,728 Value ($000) $45,735 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 157,837 Value ($000) $63,756 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 169,505 Value ($000) $71,571 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 15,683 Value ($000) $5,324 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 12,775 Value ($000) $4,227 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 10,588 Value ($000) $3,339 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 8,224 Value ($000) $2,515 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 42,279 Value ($000) $11,827 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 42,118 Value ($000) $10,141 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 43,242 Value ($000) $9,305 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	610,908	$107,514	$163.37	$138.00 - $185.17
Q3 2025	671,054	$94,001	$135.17	$121.05 - $150.28
Q2 2025	448,757	$56,359	$124.60	$110.04 - $137.32
Q1 2025	453,529	$62,061	$142.96	$128.51 - $157.09
Q4 2024	408,276	$62,434	$168.67	$145.07 - $195.00
Q3 2024	274,708	$53,249	$209.21	$188.78 - $238.00
Q2 2024	214,937	$49,827	$217.32	$189.44 - $237.54
Q1 2024	231,516	$49,922	$234.20	$211.02 - $268.30
Q4 2023	293,540	$75,959	$245.62	$220.86 - $269.43
Q3 2023	341,810	$87,849	$267.47	$251.85 - $287.60
Q2 2023	343,217	$97,765	$297.86	$273.39 - $319.76
Q1 2023	361,447	$100,493	$276.70	$254.80 - $295.90
Q4 2022	313,157	$86,719	$282.44	$250.31 - $311.88
Q3 2022	307,816	$82,186	$212.38	$193.65 - $283.44
Q2 2022	181,511	$37,017	$204.43	$187.16 - $225.50
Q1 2022	177,596	$37,403	$217.46	$192.67 - $249.00
Q4 2021	191,265	$45,890	$257.12	$221.72 - $290.76
Q3 2021	172,161	$48,722	$327.75	$282.64 - $372.12
Q2 2021	164,445	$56,939	$302.94	$257.03 - $468.55
Q1 2021	275,589	$77,093	$269.69	$238.40 - $296.38
Q4 2020	324,499	$79,458	$259.08	$223.25 - $363.92
Q3 2020	563,066	$159,728	$278.91	$261.87 - $312.00
Q2 2020	402,658	$107,729	$300.59	$257.60 - $350.24
Q1 2020	259,448	$82,083	$303.47	$262.25 - $374.99
Q4 2019	220,041	$65,293	$277.46	$219.70 - $318.00
Q3 2019	237,355	$55,265	$232.85	$215.78 - $246.99
Q2 2019	303,431	$70,963	$230.90	$219.20 - $245.35
Q1 2019	451,657	$106,762	$314.89	$216.12 - $344.00
Q4 2018	375,027	$112,766	$319.14	$278.46 - $358.41
Q3 2018	364,516	$128,788	$344.30	$288.13 - $388.67
Q2 2018	417,161	$121,078	$281.15	$249.17 - $310.91
Q1 2018	430,838	$117,973	$310.41	$259.76 - $370.57
Q4 2017	291,276	$92,792	$320.80	$301.81 - $348.84
Q3 2017	151,747	$47,515	$296.11	$269.50 - $330.00
Q2 2017	151,631	$41,146	$264.42	$244.28 - $291.90
Q1 2017	155,703	$42,572	$282.75	$260.50 - $301.42
Q4 2016	144,033	$40,846	$296.43	$268.00 - $329.83
Q3 2016	215,796	$67,551	$296.18	$240.07 - $333.65
Q2 2016	240,951	$58,265	$263.54	$223.02 - $292.69
Q1 2016	234,381	$61,015	$264.15	$242.07 - $301.02
Q4 2015	189,196	$57,960	$287.35	$254.00 - $311.65
Q3 2015	156,728	$45,735	$330.23	$265.00 - $412.24
Q2 2015	157,837	$63,756	$401.33	$368.88 - $432.88
Q1 2015	169,505	$71,571	$394.14	$334.40 - $480.18
Q4 2014	15,683	$5,324	$323.51	$290.85 - $361.93
Q3 2014	12,775	$4,227	$329.72	$298.31 - $349.00
Q2 2014	10,588	$3,339	$300.97	$272.02 - $322.25
Q1 2014	8,224	$2,515	$317.43	$270.62 - $358.89
Q4 2013	42,279	$11,827	$258.65	$221.07 - $298.82
Q3 2013	42,118	$10,141	$223.81	$203.55 - $248.95
Q2 2013	43,242	$9,305	$213.68	$191.80 - $242.64