BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Swiss National Bank's Holding History (CIK: 0001582202)

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

Q4 2025

Shares 401,800 Value ($000) $70,713 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 422,400 Value ($000) $59,170 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 443,100 Value ($000) $55,649 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 411,000 Value ($000) $56,241 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 411,500 Value ($000) $62,927 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 432,100 Value ($000) $83,758 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 430,400 Value ($000) $99,775 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 433,900 Value ($000) $93,562 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 452,900 Value ($000) $117,197 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 465,600 Value ($000) $119,664 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 521,900 Value ($000) $148,663 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 571,500 Value ($000) $158,894 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 589,800 Value ($000) $163,327 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 634,772 Value ($000) $169,484 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 637,372 Value ($000) $129,986 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 636,272 Value ($000) $133,999 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 566,572 Value ($000) $135,932 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 595,272 Value ($000) $168,456 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 621,072 Value ($000) $215,059 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 591,758 Value ($000) $165,544 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 597,958 Value ($000) $146,416 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 635,258 Value ($000) $180,210 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 688,458 Value ($000) $184,197 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 700,358 Value ($000) $221,579 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 581,558 Value ($000) $172,566 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 640,358 Value ($000) $149,088 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 641,199 Value ($000) $149,957 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 672,599 Value ($000) $158,989 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 654,799 Value ($000) $197,042 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 673,699 Value ($000) $238,025 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 699,699 Value ($000) $203,081 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 678,499 Value ($000) $185,787 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 780,899 Value ($000) $248,771 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 788,799 Value ($000) $246,989 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 788,899 Value ($000) $214,076 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 770,899 Value ($000) $210,779 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 610,299 Value ($000) $173,069 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 606,799 Value ($000) $189,946 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 612,899 Value ($000) $148,211 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 579,099 Value ($000) $144,480 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 427,199 Value ($000) $130,872 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 419,799 Value ($000) $122,502 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 378,599 Value ($000) $152,931 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 359,799 Value ($000) $151,922 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 219,299 Value ($000) $74,441 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 227,199 Value ($000) $75,160 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 230,399 Value ($000) $72,647 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 228,999 Value ($000) $70,044 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 253,199 Value ($000) $70,832 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 257,099 Value ($000) $61,899 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 251,499 Value ($000) $54,123 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	401,800	$70,713	$163.37	$138.00 - $185.17
Q3 2025	422,400	$59,170	$135.17	$121.05 - $150.28
Q2 2025	443,100	$55,649	$124.60	$110.04 - $137.32
Q1 2025	411,000	$56,241	$142.96	$128.51 - $157.09
Q4 2024	411,500	$62,927	$168.67	$145.07 - $195.00
Q3 2024	432,100	$83,758	$209.21	$188.78 - $238.00
Q2 2024	430,400	$99,775	$217.32	$189.44 - $237.54
Q1 2024	433,900	$93,562	$234.20	$211.02 - $268.30
Q4 2023	452,900	$117,197	$245.62	$220.86 - $269.43
Q3 2023	465,600	$119,664	$267.47	$251.85 - $287.60
Q2 2023	521,900	$148,663	$297.86	$273.39 - $319.76
Q1 2023	571,500	$158,894	$276.70	$254.80 - $295.90
Q4 2022	589,800	$163,327	$282.44	$250.31 - $311.88
Q3 2022	634,772	$169,484	$212.38	$193.65 - $283.44
Q2 2022	637,372	$129,986	$204.43	$187.16 - $225.50
Q1 2022	636,272	$133,999	$217.46	$192.67 - $249.00
Q4 2021	566,572	$135,932	$257.12	$221.72 - $290.76
Q3 2021	595,272	$168,456	$327.75	$282.64 - $372.12
Q2 2021	621,072	$215,059	$302.94	$257.03 - $468.55
Q1 2021	591,758	$165,544	$269.69	$238.40 - $296.38
Q4 2020	597,958	$146,416	$259.08	$223.25 - $363.92
Q3 2020	635,258	$180,210	$278.91	$261.87 - $312.00
Q2 2020	688,458	$184,197	$300.59	$257.60 - $350.24
Q1 2020	700,358	$221,579	$303.47	$262.25 - $374.99
Q4 2019	581,558	$172,566	$277.46	$219.70 - $318.00
Q3 2019	640,358	$149,088	$232.85	$215.78 - $246.99
Q2 2019	641,199	$149,957	$230.90	$219.20 - $245.35
Q1 2019	672,599	$158,989	$314.89	$216.12 - $344.00
Q4 2018	654,799	$197,042	$319.14	$278.46 - $358.41
Q3 2018	673,699	$238,025	$344.30	$288.13 - $388.67
Q2 2018	699,699	$203,081	$281.15	$249.17 - $310.91
Q1 2018	678,499	$185,787	$310.41	$259.76 - $370.57
Q4 2017	780,899	$248,771	$320.80	$301.81 - $348.84
Q3 2017	788,799	$246,989	$296.11	$269.50 - $330.00
Q2 2017	788,899	$214,076	$264.42	$244.28 - $291.90
Q1 2017	770,899	$210,779	$282.75	$260.50 - $301.42
Q4 2016	610,299	$173,069	$296.43	$268.00 - $329.83
Q3 2016	606,799	$189,946	$296.18	$240.07 - $333.65
Q2 2016	612,899	$148,211	$263.54	$223.02 - $292.69
Q1 2016	579,099	$144,480	$264.15	$242.07 - $301.02
Q4 2015	427,199	$130,872	$287.35	$254.00 - $311.65
Q3 2015	419,799	$122,502	$330.23	$265.00 - $412.24
Q2 2015	378,599	$152,931	$401.33	$368.88 - $432.88
Q1 2015	359,799	$151,922	$394.14	$334.40 - $480.18
Q4 2014	219,299	$74,441	$323.51	$290.85 - $361.93
Q3 2014	227,199	$75,160	$329.72	$298.31 - $349.00
Q2 2014	230,399	$72,647	$300.97	$272.02 - $322.25
Q1 2014	228,999	$70,044	$317.43	$270.62 - $358.89
Q4 2013	253,199	$70,832	$258.65	$221.07 - $298.82
Q3 2013	257,099	$61,899	$223.81	$203.55 - $248.95
Q2 2013	251,499	$54,123	$213.68	$191.80 - $242.64