BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

SECURIAN ASSET MANAGEMENT, INC's Holding History (CIK: 0001035350)

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

Q4 2025

Shares 3,945 Value ($000) $694 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 6,950 Value ($000) $974 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 7,596 Value ($000) $954 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 7,696 Value ($000) $1,053 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 7,696 Value ($000) $1,177 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 7,996 Value ($000) $1,550 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 8,296 Value ($000) $1,923 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 8,496 Value ($000) $1,832 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 9,179 Value ($000) $2,375 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 10,380 Value ($000) $2,668 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 12,093 Value ($000) $3,445 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 12,093 Value ($000) $3,362 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 11,993 Value ($000) $3,321 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 11,811 Value ($000) $3,154 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 11,911 Value ($000) $2,429 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 11,911 Value ($000) $2,508 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 12,111 Value ($000) $2,906 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 12,734 Value ($000) $3,604 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 12,986 Value ($000) $4,497 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 13,260 Value ($000) $3,709 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 13,764 Value ($000) $3,370 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 14,440 Value ($000) $4,096 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 15,006 Value ($000) $4,015 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 17,742 Value ($000) $5,613 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 18,008 Value ($000) $5,344 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 19,131 Value ($000) $4,454 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 20,363 Value ($000) $4,762 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 20,463 Value ($000) $4,837 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 20,711 Value ($000) $6,232 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 20,694 Value ($000) $7,311 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 21,700 Value ($000) $6,298 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 21,600 Value ($000) $5,915 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 21,700 Value ($000) $6,913 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 21,580 Value ($000) $6,757 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 21,562 Value ($000) $5,851 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 21,862 Value ($000) $5,978 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 21,910 Value ($000) $6,213 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 22,037 Value ($000) $6,898 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 21,822 Value ($000) $5,277 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 21,479 Value ($000) $5,591 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 21,725 Value ($000) $6,655 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 22,206 Value ($000) $6,480 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 22,331 Value ($000) $9,020 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 22,017 Value ($000) $9,296 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 21,472 Value ($000) $7,289 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 20,866 Value ($000) $6,903 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 21,270 Value ($000) $6,707 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 21,146 Value ($000) $6,468 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 20,993 Value ($000) $5,873 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 21,258 Value ($000) $5,118 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 20,858 Value ($000) $4,489 Avg Close $213.68 Range $191.80 - $242.64

Q1 2013

Shares 20,021 Value ($000) $3,862 Avg Close $161.63 Range $139.72 - $192.92

Q4 2012

Shares 20,008 Value ($000) $2,935 Avg Close — Range —

Q3 2012

Shares 20,487 Value ($000) $3,057 Avg Close — Range —

Q2 2012

Shares 20,787 Value ($000) $3,001 Avg Close — Range —

Q1 2012

Shares 20,904 Value ($000) $2,633 Avg Close — Range —

Q4 2011

Shares 21,034 Value ($000) $2,315 Avg Close — Range —

Q3 2011

Shares 20,768 Value ($000) $1,935 Avg Close — Range —

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	3,945	$694	$163.37	$138.00 - $185.17
Q3 2025	6,950	$974	$135.17	$121.05 - $150.28
Q2 2025	7,596	$954	$124.60	$110.04 - $137.32
Q1 2025	7,696	$1,053	$142.96	$128.51 - $157.09
Q4 2024	7,696	$1,177	$168.67	$145.07 - $195.00
Q3 2024	7,996	$1,550	$209.21	$188.78 - $238.00
Q2 2024	8,296	$1,923	$217.32	$189.44 - $237.54
Q1 2024	8,496	$1,832	$234.20	$211.02 - $268.30
Q4 2023	9,179	$2,375	$245.62	$220.86 - $269.43
Q3 2023	10,380	$2,668	$267.47	$251.85 - $287.60
Q2 2023	12,093	$3,445	$297.86	$273.39 - $319.76
Q1 2023	12,093	$3,362	$276.70	$254.80 - $295.90
Q4 2022	11,993	$3,321	$282.44	$250.31 - $311.88
Q3 2022	11,811	$3,154	$212.38	$193.65 - $283.44
Q2 2022	11,911	$2,429	$204.43	$187.16 - $225.50
Q1 2022	11,911	$2,508	$217.46	$192.67 - $249.00
Q4 2021	12,111	$2,906	$257.12	$221.72 - $290.76
Q3 2021	12,734	$3,604	$327.75	$282.64 - $372.12
Q2 2021	12,986	$4,497	$302.94	$257.03 - $468.55
Q1 2021	13,260	$3,709	$269.69	$238.40 - $296.38
Q4 2020	13,764	$3,370	$259.08	$223.25 - $363.92
Q3 2020	14,440	$4,096	$278.91	$261.87 - $312.00
Q2 2020	15,006	$4,015	$300.59	$257.60 - $350.24
Q1 2020	17,742	$5,613	$303.47	$262.25 - $374.99
Q4 2019	18,008	$5,344	$277.46	$219.70 - $318.00
Q3 2019	19,131	$4,454	$232.85	$215.78 - $246.99
Q2 2019	20,363	$4,762	$230.90	$219.20 - $245.35
Q1 2019	20,463	$4,837	$314.89	$216.12 - $344.00
Q4 2018	20,711	$6,232	$319.14	$278.46 - $358.41
Q3 2018	20,694	$7,311	$344.30	$288.13 - $388.67
Q2 2018	21,700	$6,298	$281.15	$249.17 - $310.91
Q1 2018	21,600	$5,915	$310.41	$259.76 - $370.57
Q4 2017	21,700	$6,913	$320.80	$301.81 - $348.84
Q3 2017	21,580	$6,757	$296.11	$269.50 - $330.00
Q2 2017	21,562	$5,851	$264.42	$244.28 - $291.90
Q1 2017	21,862	$5,978	$282.75	$260.50 - $301.42
Q4 2016	21,910	$6,213	$296.43	$268.00 - $329.83
Q3 2016	22,037	$6,898	$296.18	$240.07 - $333.65
Q2 2016	21,822	$5,277	$263.54	$223.02 - $292.69
Q1 2016	21,479	$5,591	$264.15	$242.07 - $301.02
Q4 2015	21,725	$6,655	$287.35	$254.00 - $311.65
Q3 2015	22,206	$6,480	$330.23	$265.00 - $412.24
Q2 2015	22,331	$9,020	$401.33	$368.88 - $432.88
Q1 2015	22,017	$9,296	$394.14	$334.40 - $480.18
Q4 2014	21,472	$7,289	$323.51	$290.85 - $361.93
Q3 2014	20,866	$6,903	$329.72	$298.31 - $349.00
Q2 2014	21,270	$6,707	$300.97	$272.02 - $322.25
Q1 2014	21,146	$6,468	$317.43	$270.62 - $358.89
Q4 2013	20,993	$5,873	$258.65	$221.07 - $298.82
Q3 2013	21,258	$5,118	$223.81	$203.55 - $248.95
Q2 2013	20,858	$4,489	$213.68	$191.80 - $242.64
Q1 2013	20,021	$3,862	$161.63	$139.72 - $192.92
Q4 2012	20,008	$2,935	—	—
Q3 2012	20,487	$3,057	—	—
Q2 2012	20,787	$3,001	—	—
Q1 2012	20,904	$2,633	—	—
Q4 2011	21,034	$2,315	—	—
Q3 2011	20,768	$1,935	—	—