BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Calamos Advisors LLC's Holding History (CIK: 0001316507)

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

Q4 2025

Shares 35,527 Value ($000) $6,252 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 36,970 Value ($000) $5,179 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 36,970 Value ($000) $4,643 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 36,970 Value ($000) $5,059 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 36,558 Value ($000) $5,590 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 36,558 Value ($000) $7,086 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 37,455 Value ($000) $8,683 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 38,822 Value ($000) $8,371 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 39,798 Value ($000) $10,299 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 40,318 Value ($000) $10,362 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 40,318 Value ($000) $11,485 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 40,318 Value ($000) $11,210 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 45,359 Value ($000) $12,561 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 53,379 Value ($000) $14,252 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 53,379 Value ($000) $10,886 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 51,941 Value ($000) $10,939 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 45,018 Value ($000) $10,801 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 43,275 Value ($000) $12,246 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 39,457 Value ($000) $13,663 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 32,910 Value ($000) $9,207 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 31,952 Value ($000) $7,824 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 33,293 Value ($000) $9,445 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 36,045 Value ($000) $9,644 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 38,228 Value ($000) $12,095 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 41,317 Value ($000) $12,260 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 42,509 Value ($000) $9,897 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 39,062 Value ($000) $9,135 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 72,964 Value ($000) $17,247 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 92,628 Value ($000) $27,874 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 66,056 Value ($000) $23,338 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 33,160 Value ($000) $9,624 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 31,158 Value ($000) $8,532 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 29,800 Value ($000) $9,493 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 30,350 Value ($000) $9,503 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 28,805 Value ($000) $7,817 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 28,092 Value ($000) $7,681 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 28,152 Value ($000) $7,983 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 64,815 Value ($000) $20,289 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 64,908 Value ($000) $15,696 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 64,926 Value ($000) $16,902 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 63,045 Value ($000) $19,314 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 96,936 Value ($000) $28,287 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 309,983 Value ($000) $125,215 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 209,696 Value ($000) $88,542 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 155,039 Value ($000) $52,628 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 156,686 Value ($000) $51,833 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 182,579 Value ($000) $57,569 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 200,697 Value ($000) $61,387 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 166,231 Value ($000) $46,503 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 188,130 Value ($000) $45,294 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 172,479 Value ($000) $37,117 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	35,527	$6,252	$163.37	$138.00 - $185.17
Q3 2025	36,970	$5,179	$135.17	$121.05 - $150.28
Q2 2025	36,970	$4,643	$124.60	$110.04 - $137.32
Q1 2025	36,970	$5,059	$142.96	$128.51 - $157.09
Q4 2024	36,558	$5,590	$168.67	$145.07 - $195.00
Q3 2024	36,558	$7,086	$209.21	$188.78 - $238.00
Q2 2024	37,455	$8,683	$217.32	$189.44 - $237.54
Q1 2024	38,822	$8,371	$234.20	$211.02 - $268.30
Q4 2023	39,798	$10,299	$245.62	$220.86 - $269.43
Q3 2023	40,318	$10,362	$267.47	$251.85 - $287.60
Q2 2023	40,318	$11,485	$297.86	$273.39 - $319.76
Q1 2023	40,318	$11,210	$276.70	$254.80 - $295.90
Q4 2022	45,359	$12,561	$282.44	$250.31 - $311.88
Q3 2022	53,379	$14,252	$212.38	$193.65 - $283.44
Q2 2022	53,379	$10,886	$204.43	$187.16 - $225.50
Q1 2022	51,941	$10,939	$217.46	$192.67 - $249.00
Q4 2021	45,018	$10,801	$257.12	$221.72 - $290.76
Q3 2021	43,275	$12,246	$327.75	$282.64 - $372.12
Q2 2021	39,457	$13,663	$302.94	$257.03 - $468.55
Q1 2021	32,910	$9,207	$269.69	$238.40 - $296.38
Q4 2020	31,952	$7,824	$259.08	$223.25 - $363.92
Q3 2020	33,293	$9,445	$278.91	$261.87 - $312.00
Q2 2020	36,045	$9,644	$300.59	$257.60 - $350.24
Q1 2020	38,228	$12,095	$303.47	$262.25 - $374.99
Q4 2019	41,317	$12,260	$277.46	$219.70 - $318.00
Q3 2019	42,509	$9,897	$232.85	$215.78 - $246.99
Q2 2019	39,062	$9,135	$230.90	$219.20 - $245.35
Q1 2019	72,964	$17,247	$314.89	$216.12 - $344.00
Q4 2018	92,628	$27,874	$319.14	$278.46 - $358.41
Q3 2018	66,056	$23,338	$344.30	$288.13 - $388.67
Q2 2018	33,160	$9,624	$281.15	$249.17 - $310.91
Q1 2018	31,158	$8,532	$310.41	$259.76 - $370.57
Q4 2017	29,800	$9,493	$320.80	$301.81 - $348.84
Q3 2017	30,350	$9,503	$296.11	$269.50 - $330.00
Q2 2017	28,805	$7,817	$264.42	$244.28 - $291.90
Q1 2017	28,092	$7,681	$282.75	$260.50 - $301.42
Q4 2016	28,152	$7,983	$296.43	$268.00 - $329.83
Q3 2016	64,815	$20,289	$296.18	$240.07 - $333.65
Q2 2016	64,908	$15,696	$263.54	$223.02 - $292.69
Q1 2016	64,926	$16,902	$264.15	$242.07 - $301.02
Q4 2015	63,045	$19,314	$287.35	$254.00 - $311.65
Q3 2015	96,936	$28,287	$330.23	$265.00 - $412.24
Q2 2015	309,983	$125,215	$401.33	$368.88 - $432.88
Q1 2015	209,696	$88,542	$394.14	$334.40 - $480.18
Q4 2014	155,039	$52,628	$323.51	$290.85 - $361.93
Q3 2014	156,686	$51,833	$329.72	$298.31 - $349.00
Q2 2014	182,579	$57,569	$300.97	$272.02 - $322.25
Q1 2014	200,697	$61,387	$317.43	$270.62 - $358.89
Q4 2013	166,231	$46,503	$258.65	$221.07 - $298.82
Q3 2013	188,130	$45,294	$223.81	$203.55 - $248.95
Q2 2013	172,479	$37,117	$213.68	$191.80 - $242.64