BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2025

Shares 183,744 Value ($000) $32,337 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 237,275 Value ($000) $33,237 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 231,108 Value ($000) $29,025 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 229,054 Value ($000) $31,344 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 180,723 Value ($000) $27,636 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 179,131 Value ($000) $34,723 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 281,289 Value ($000) $65,208 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 201,891 Value ($000) $43,534 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 229,813 Value ($000) $59,469 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 251,504 Value ($000) $64,639 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 240,399 Value ($000) $68,478 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 293,523 Value ($000) $81,608 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 242,978 Value ($000) $67,285 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 232,379 Value ($000) $62,045 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 230,578 Value ($000) $47,024 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 194,490 Value ($000) $40,960 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 193,708 Value ($000) $46,474 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 237,636 Value ($000) $67,249 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 230,359 Value ($000) $79,766 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 257,373 Value ($000) $72,000 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 276,975 Value ($000) $67,820 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 271,020 Value ($000) $76,883 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 281,711 Value ($000) $75,372 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 316,793 Value ($000) $100,227 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 430,454 Value ($000) $127,729 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 1,495,086 Value ($000) $348,086 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 1,730,593 Value ($000) $404,734 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 2,504,536 Value ($000) $592,022 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 2,831,228 Value ($000) $851,973 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 3,121,144 Value ($000) $1,102,731 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 3,831,425 Value ($000) $1,112,033 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 4,024,770 Value ($000) $1,102,063 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 3,414,672 Value ($000) $1,087,812 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 2,687,665 Value ($000) $841,562 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 2,403,747 Value ($000) $652,281 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 2,937,319 Value ($000) $803,122 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 2,643,011 Value ($000) $749,505 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 2,798,362 Value ($000) $875,971 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 3,184,239 Value ($000) $770,013 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 3,162,932 Value ($000) $823,374 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 2,828,416 Value ($000) $866,485 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 2,512,333 Value ($000) $733,124 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 1,830,976 Value ($000) $739,604 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 1,729,597 Value ($000) $730,305 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 1,576,365 Value ($000) $535,097 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 1,671,693 Value ($000) $553,013 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 1,815,868 Value ($000) $572,561 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 1,597,709 Value ($000) $488,691 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 2,086,420 Value ($000) $583,676 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 2,373,317 Value ($000) $571,400 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 2,988,196 Value ($000) $643,060 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	183,744	$32,337	$163.37	$138.00 - $185.17
Q3 2025	237,275	$33,237	$135.17	$121.05 - $150.28
Q2 2025	231,108	$29,025	$124.60	$110.04 - $137.32
Q1 2025	229,054	$31,344	$142.96	$128.51 - $157.09
Q4 2024	180,723	$27,636	$168.67	$145.07 - $195.00
Q3 2024	179,131	$34,723	$209.21	$188.78 - $238.00
Q2 2024	281,289	$65,208	$217.32	$189.44 - $237.54
Q1 2024	201,891	$43,534	$234.20	$211.02 - $268.30
Q4 2023	229,813	$59,469	$245.62	$220.86 - $269.43
Q3 2023	251,504	$64,639	$267.47	$251.85 - $287.60
Q2 2023	240,399	$68,478	$297.86	$273.39 - $319.76
Q1 2023	293,523	$81,608	$276.70	$254.80 - $295.90
Q4 2022	242,978	$67,285	$282.44	$250.31 - $311.88
Q3 2022	232,379	$62,045	$212.38	$193.65 - $283.44
Q2 2022	230,578	$47,024	$204.43	$187.16 - $225.50
Q1 2022	194,490	$40,960	$217.46	$192.67 - $249.00
Q4 2021	193,708	$46,474	$257.12	$221.72 - $290.76
Q3 2021	237,636	$67,249	$327.75	$282.64 - $372.12
Q2 2021	230,359	$79,766	$302.94	$257.03 - $468.55
Q1 2021	257,373	$72,000	$269.69	$238.40 - $296.38
Q4 2020	276,975	$67,820	$259.08	$223.25 - $363.92
Q3 2020	271,020	$76,883	$278.91	$261.87 - $312.00
Q2 2020	281,711	$75,372	$300.59	$257.60 - $350.24
Q1 2020	316,793	$100,227	$303.47	$262.25 - $374.99
Q4 2019	430,454	$127,729	$277.46	$219.70 - $318.00
Q3 2019	1,495,086	$348,086	$232.85	$215.78 - $246.99
Q2 2019	1,730,593	$404,734	$230.90	$219.20 - $245.35
Q1 2019	2,504,536	$592,022	$314.89	$216.12 - $344.00
Q4 2018	2,831,228	$851,973	$319.14	$278.46 - $358.41
Q3 2018	3,121,144	$1,102,731	$344.30	$288.13 - $388.67
Q2 2018	3,831,425	$1,112,033	$281.15	$249.17 - $310.91
Q1 2018	4,024,770	$1,102,063	$310.41	$259.76 - $370.57
Q4 2017	3,414,672	$1,087,812	$320.80	$301.81 - $348.84
Q3 2017	2,687,665	$841,562	$296.11	$269.50 - $330.00
Q2 2017	2,403,747	$652,281	$264.42	$244.28 - $291.90
Q1 2017	2,937,319	$803,122	$282.75	$260.50 - $301.42
Q4 2016	2,643,011	$749,505	$296.43	$268.00 - $329.83
Q3 2016	2,798,362	$875,971	$296.18	$240.07 - $333.65
Q2 2016	3,184,239	$770,013	$263.54	$223.02 - $292.69
Q1 2016	3,162,932	$823,374	$264.15	$242.07 - $301.02
Q4 2015	2,828,416	$866,485	$287.35	$254.00 - $311.65
Q3 2015	2,512,333	$733,124	$330.23	$265.00 - $412.24
Q2 2015	1,830,976	$739,604	$401.33	$368.88 - $432.88
Q1 2015	1,729,597	$730,305	$394.14	$334.40 - $480.18
Q4 2014	1,576,365	$535,097	$323.51	$290.85 - $361.93
Q3 2014	1,671,693	$553,013	$329.72	$298.31 - $349.00
Q2 2014	1,815,868	$572,561	$300.97	$272.02 - $322.25
Q1 2014	1,597,709	$488,691	$317.43	$270.62 - $358.89
Q4 2013	2,086,420	$583,676	$258.65	$221.07 - $298.82
Q3 2013	2,373,317	$571,400	$223.81	$203.55 - $248.95
Q2 2013	2,988,196	$643,060	$213.68	$191.80 - $242.64