BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BANK OF MONTREAL /CAN/'s Holding History (CIK: 0000927971)

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

Q4 2025

Shares 113,684 Value ($000) $20,007 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 125,255 Value ($000) $17,546 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 103,314 Value ($000) $12,975 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 132,968 Value ($000) $18,195 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 211,336 Value ($000) $32,318 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 219,911 Value ($000) $42,810 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 234,331 Value ($000) $57,411 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 236,815 Value ($000) $58,020 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 292,400 Value ($000) $76,480 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 206,843 Value ($000) $53,883 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 217,115 Value ($000) $64,935 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 201,624 Value ($000) $56,241 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 323,807 Value ($000) $94,717 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 279,274 Value ($000) $75,683 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 228,647 Value ($000) $56,019 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 166,103 Value ($000) $40,696 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 278,680 Value ($000) $68,277 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 287,699 Value ($000) $91,718 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 192,594 Value ($000) $78,963 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 177,345 Value ($000) $47,124 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 250,807 Value ($000) $67,096 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 197,106 Value ($000) $55,417 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 197,533 Value ($000) $55,052 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 169,821 Value ($000) $51,707 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 225,526 Value ($000) $66,920 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 367,357 Value ($000) $85,528 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 305,450 Value ($000) $71,438 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 254,680 Value ($000) $60,202 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 407,953 Value ($000) $122,761 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 237,686 Value ($000) $83,974 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 218,942 Value ($000) $63,546 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 190,901 Value ($000) $52,272 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 246,846 Value ($000) $78,638 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 203,381 Value ($000) $63,684 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 442,083 Value ($000) $119,964 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 324,567 Value ($000) $88,744 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 123,919 Value ($000) $36,441 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 115,666 Value ($000) $36,207 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 110,460 Value ($000) $26,713 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 108,156 Value ($000) $28,155 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 106,865 Value ($000) $32,739 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 116,389 Value ($000) $33,964 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 128,217 Value ($000) $51,793 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 130,289 Value ($000) $55,012 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 249,946 Value ($000) $84,844 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 157,702 Value ($000) $52,170 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 248,326 Value ($000) $78,300 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 179,272 Value ($000) $54,833 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 241,857 Value ($000) $67,617 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 127,708 Value ($000) $30,746 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 230,599 Value ($000) $49,625 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	113,684	$20,007	$163.37	$138.00 - $185.17
Q3 2025	125,255	$17,546	$135.17	$121.05 - $150.28
Q2 2025	103,314	$12,975	$124.60	$110.04 - $137.32
Q1 2025	132,968	$18,195	$142.96	$128.51 - $157.09
Q4 2024	211,336	$32,318	$168.67	$145.07 - $195.00
Q3 2024	219,911	$42,810	$209.21	$188.78 - $238.00
Q2 2024	234,331	$57,411	$217.32	$189.44 - $237.54
Q1 2024	236,815	$58,020	$234.20	$211.02 - $268.30
Q4 2023	292,400	$76,480	$245.62	$220.86 - $269.43
Q3 2023	206,843	$53,883	$267.47	$251.85 - $287.60
Q2 2023	217,115	$64,935	$297.86	$273.39 - $319.76
Q1 2023	201,624	$56,241	$276.70	$254.80 - $295.90
Q4 2022	323,807	$94,717	$282.44	$250.31 - $311.88
Q3 2022	279,274	$75,683	$212.38	$193.65 - $283.44
Q2 2022	228,647	$56,019	$204.43	$187.16 - $225.50
Q1 2022	166,103	$40,696	$217.46	$192.67 - $249.00
Q4 2021	278,680	$68,277	$257.12	$221.72 - $290.76
Q3 2021	287,699	$91,718	$327.75	$282.64 - $372.12
Q2 2021	192,594	$78,963	$302.94	$257.03 - $468.55
Q1 2021	177,345	$47,124	$269.69	$238.40 - $296.38
Q4 2020	250,807	$67,096	$259.08	$223.25 - $363.92
Q3 2020	197,106	$55,417	$278.91	$261.87 - $312.00
Q2 2020	197,533	$55,052	$300.59	$257.60 - $350.24
Q1 2020	169,821	$51,707	$303.47	$262.25 - $374.99
Q4 2019	225,526	$66,920	$277.46	$219.70 - $318.00
Q3 2019	367,357	$85,528	$232.85	$215.78 - $246.99
Q2 2019	305,450	$71,438	$230.90	$219.20 - $245.35
Q1 2019	254,680	$60,202	$314.89	$216.12 - $344.00
Q4 2018	407,953	$122,761	$319.14	$278.46 - $358.41
Q3 2018	237,686	$83,974	$344.30	$288.13 - $388.67
Q2 2018	218,942	$63,546	$281.15	$249.17 - $310.91
Q1 2018	190,901	$52,272	$310.41	$259.76 - $370.57
Q4 2017	246,846	$78,638	$320.80	$301.81 - $348.84
Q3 2017	203,381	$63,684	$296.11	$269.50 - $330.00
Q2 2017	442,083	$119,964	$264.42	$244.28 - $291.90
Q1 2017	324,567	$88,744	$282.75	$260.50 - $301.42
Q4 2016	123,919	$36,441	$296.43	$268.00 - $329.83
Q3 2016	115,666	$36,207	$296.18	$240.07 - $333.65
Q2 2016	110,460	$26,713	$263.54	$223.02 - $292.69
Q1 2016	108,156	$28,155	$264.15	$242.07 - $301.02
Q4 2015	106,865	$32,739	$287.35	$254.00 - $311.65
Q3 2015	116,389	$33,964	$330.23	$265.00 - $412.24
Q2 2015	128,217	$51,793	$401.33	$368.88 - $432.88
Q1 2015	130,289	$55,012	$394.14	$334.40 - $480.18
Q4 2014	249,946	$84,844	$323.51	$290.85 - $361.93
Q3 2014	157,702	$52,170	$329.72	$298.31 - $349.00
Q2 2014	248,326	$78,300	$300.97	$272.02 - $322.25
Q1 2014	179,272	$54,833	$317.43	$270.62 - $358.89
Q4 2013	241,857	$67,617	$258.65	$221.07 - $298.82
Q3 2013	127,708	$30,746	$223.81	$203.55 - $248.95
Q2 2013	230,599	$49,625	$213.68	$191.80 - $242.64