BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

CANADA PENSION PLAN INVESTMENT BOARD's Holding History (CIK: 0001283718)

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

Q4 2025

Shares 138,078 Value ($000) $24,300 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 239,380 Value ($000) $33,532 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 255,183 Value ($000) $32,048 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 230,804 Value ($000) $31,583 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 261,162 Value ($000) $39,937 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 205,030 Value ($000) $39,743 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 173,664 Value ($000) $40,259 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 109,159 Value ($000) $23,538 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 105,926 Value ($000) $27,410 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 245,210 Value ($000) $63,021 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 152,810 Value ($000) $43,528 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 168,810 Value ($000) $46,934 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 157,395 Value ($000) $43,586 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 220,255 Value ($000) $58,808 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 96,855 Value ($000) $19,753 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 120,455 Value ($000) $25,368 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 242,129 Value ($000) $58,092 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 268,815 Value ($000) $76,072 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 241,290 Value ($000) $83,551 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 244,774 Value ($000) $68,476 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 15,310 Value ($000) $3,749 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 42,233 Value ($000) $11,981 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 66,157 Value ($000) $17,700 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 78,032 Value ($000) $24,688 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 145,880 Value ($000) $43,287 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 457,460 Value ($000) $106,506 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 399,890 Value ($000) $93,522 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 403,450 Value ($000) $95,368 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 345,136 Value ($000) $103,850 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 504,918 Value ($000) $178,393 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 169,437 Value ($000) $49,177 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 511,131 Value ($000) $139,958 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 252,531 Value ($000) $80,449 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 364,231 Value ($000) $114,048 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 356,731 Value ($000) $96,803 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 237,731 Value ($000) $65,000 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 184,231 Value ($000) $52,244 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 71,100 Value ($000) $22,256 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 79,687 Value ($000) $19,270 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 31,887 Value ($000) $8,301 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 41,287 Value ($000) $12,648 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 45,587 Value ($000) $13,303 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 106,387 Value ($000) $42,974 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 90,487 Value ($000) $38,207 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 207,893 Value ($000) $70,569 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 119,698 Value ($000) $39,597 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 115,436 Value ($000) $36,398 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 147,798 Value ($000) $45,207 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 79,348 Value ($000) $22,183 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 63,085 Value ($000) $15,188 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 43,625 Value ($000) $9,388 Avg Close $213.68 Range $191.80 - $242.64

Q1 2013

Shares 61,600 Value ($000) $11,865 Avg Close $161.63 Range $139.72 - $192.92

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	138,078	$24,300	$163.37	$138.00 - $185.17
Q3 2025	239,380	$33,532	$135.17	$121.05 - $150.28
Q2 2025	255,183	$32,048	$124.60	$110.04 - $137.32
Q1 2025	230,804	$31,583	$142.96	$128.51 - $157.09
Q4 2024	261,162	$39,937	$168.67	$145.07 - $195.00
Q3 2024	205,030	$39,743	$209.21	$188.78 - $238.00
Q2 2024	173,664	$40,259	$217.32	$189.44 - $237.54
Q1 2024	109,159	$23,538	$234.20	$211.02 - $268.30
Q4 2023	105,926	$27,410	$245.62	$220.86 - $269.43
Q3 2023	245,210	$63,021	$267.47	$251.85 - $287.60
Q2 2023	152,810	$43,528	$297.86	$273.39 - $319.76
Q1 2023	168,810	$46,934	$276.70	$254.80 - $295.90
Q4 2022	157,395	$43,586	$282.44	$250.31 - $311.88
Q3 2022	220,255	$58,808	$212.38	$193.65 - $283.44
Q2 2022	96,855	$19,753	$204.43	$187.16 - $225.50
Q1 2022	120,455	$25,368	$217.46	$192.67 - $249.00
Q4 2021	242,129	$58,092	$257.12	$221.72 - $290.76
Q3 2021	268,815	$76,072	$327.75	$282.64 - $372.12
Q2 2021	241,290	$83,551	$302.94	$257.03 - $468.55
Q1 2021	244,774	$68,476	$269.69	$238.40 - $296.38
Q4 2020	15,310	$3,749	$259.08	$223.25 - $363.92
Q3 2020	42,233	$11,981	$278.91	$261.87 - $312.00
Q2 2020	66,157	$17,700	$300.59	$257.60 - $350.24
Q1 2020	78,032	$24,688	$303.47	$262.25 - $374.99
Q4 2019	145,880	$43,287	$277.46	$219.70 - $318.00
Q3 2019	457,460	$106,506	$232.85	$215.78 - $246.99
Q2 2019	399,890	$93,522	$230.90	$219.20 - $245.35
Q1 2019	403,450	$95,368	$314.89	$216.12 - $344.00
Q4 2018	345,136	$103,850	$319.14	$278.46 - $358.41
Q3 2018	504,918	$178,393	$344.30	$288.13 - $388.67
Q2 2018	169,437	$49,177	$281.15	$249.17 - $310.91
Q1 2018	511,131	$139,958	$310.41	$259.76 - $370.57
Q4 2017	252,531	$80,449	$320.80	$301.81 - $348.84
Q3 2017	364,231	$114,048	$296.11	$269.50 - $330.00
Q2 2017	356,731	$96,803	$264.42	$244.28 - $291.90
Q1 2017	237,731	$65,000	$282.75	$260.50 - $301.42
Q4 2016	184,231	$52,244	$296.43	$268.00 - $329.83
Q3 2016	71,100	$22,256	$296.18	$240.07 - $333.65
Q2 2016	79,687	$19,270	$263.54	$223.02 - $292.69
Q1 2016	31,887	$8,301	$264.15	$242.07 - $301.02
Q4 2015	41,287	$12,648	$287.35	$254.00 - $311.65
Q3 2015	45,587	$13,303	$330.23	$265.00 - $412.24
Q2 2015	106,387	$42,974	$401.33	$368.88 - $432.88
Q1 2015	90,487	$38,207	$394.14	$334.40 - $480.18
Q4 2014	207,893	$70,569	$323.51	$290.85 - $361.93
Q3 2014	119,698	$39,597	$329.72	$298.31 - $349.00
Q2 2014	115,436	$36,398	$300.97	$272.02 - $322.25
Q1 2014	147,798	$45,207	$317.43	$270.62 - $358.89
Q4 2013	79,348	$22,183	$258.65	$221.07 - $298.82
Q3 2013	63,085	$15,188	$223.81	$203.55 - $248.95
Q2 2013	43,625	$9,388	$213.68	$191.80 - $242.64
Q1 2013	61,600	$11,865	$161.63	$139.72 - $192.92