BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Retirement Systems of Alabama's Holding History (CIK: 0001593051)

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

Q4 2025

Shares 31,210 Value ($000) $5,493 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 31,275 Value ($000) $4,381 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 31,442 Value ($000) $3,949 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 183,551 Value ($000) $25,117 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 185,383 Value ($000) $28,349 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 31,321 Value ($000) $6,071 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 32,117 Value ($000) $7,445 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 31,981 Value ($000) $6,896 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 31,933 Value ($000) $8,263 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 169,646 Value ($000) $43,601 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 169,797 Value ($000) $48,367 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 179,463 Value ($000) $49,896 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 146,132 Value ($000) $40,467 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 48,200 Value ($000) $12,869 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 262,029 Value ($000) $53,438 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 263,426 Value ($000) $55,478 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 82,625 Value ($000) $19,823 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 76,552 Value ($000) $21,663 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 83,965 Value ($000) $29,075 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 84,272 Value ($000) $23,575 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 91,144 Value ($000) $22,318 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 86,154 Value ($000) $24,440 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 87,047 Value ($000) $23,289 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 79,322 Value ($000) $25,096 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 79,303 Value ($000) $23,532 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 80,772 Value ($000) $18,805 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 90,434 Value ($000) $21,150 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 161,097 Value ($000) $38,080 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 92,896 Value ($000) $27,954 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 132,396 Value ($000) $46,777 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 223,334 Value ($000) $64,820 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 225,268 Value ($000) $61,683 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 195,563 Value ($000) $62,301 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 161,949 Value ($000) $50,709 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 145,273 Value ($000) $39,421 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 146,064 Value ($000) $39,937 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 147,841 Value ($000) $41,925 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 152,525 Value ($000) $47,745 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 201,775 Value ($000) $48,793 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 199,900 Value ($000) $52,038 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 205,692 Value ($000) $63,014 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 222,768 Value ($000) $65,006 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 174,046 Value ($000) $70,304 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 175,133 Value ($000) $73,948 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 179,099 Value ($000) $60,795 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 179,181 Value ($000) $59,275 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 180,792 Value ($000) $57,006 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 181,206 Value ($000) $55,425 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 141,569 Value ($000) $39,604 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 141,409 Value ($000) $34,046 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 139,662 Value ($000) $30,055 Avg Close $213.68 Range $191.80 - $242.64

Q1 2013

Shares 136,915 Value ($000) $26,412 Avg Close $161.63 Range $139.72 - $192.92

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	31,210	$5,493	$163.37	$138.00 - $185.17
Q3 2025	31,275	$4,381	$135.17	$121.05 - $150.28
Q2 2025	31,442	$3,949	$124.60	$110.04 - $137.32
Q1 2025	183,551	$25,117	$142.96	$128.51 - $157.09
Q4 2024	185,383	$28,349	$168.67	$145.07 - $195.00
Q3 2024	31,321	$6,071	$209.21	$188.78 - $238.00
Q2 2024	32,117	$7,445	$217.32	$189.44 - $237.54
Q1 2024	31,981	$6,896	$234.20	$211.02 - $268.30
Q4 2023	31,933	$8,263	$245.62	$220.86 - $269.43
Q3 2023	169,646	$43,601	$267.47	$251.85 - $287.60
Q2 2023	169,797	$48,367	$297.86	$273.39 - $319.76
Q1 2023	179,463	$49,896	$276.70	$254.80 - $295.90
Q4 2022	146,132	$40,467	$282.44	$250.31 - $311.88
Q3 2022	48,200	$12,869	$212.38	$193.65 - $283.44
Q2 2022	262,029	$53,438	$204.43	$187.16 - $225.50
Q1 2022	263,426	$55,478	$217.46	$192.67 - $249.00
Q4 2021	82,625	$19,823	$257.12	$221.72 - $290.76
Q3 2021	76,552	$21,663	$327.75	$282.64 - $372.12
Q2 2021	83,965	$29,075	$302.94	$257.03 - $468.55
Q1 2021	84,272	$23,575	$269.69	$238.40 - $296.38
Q4 2020	91,144	$22,318	$259.08	$223.25 - $363.92
Q3 2020	86,154	$24,440	$278.91	$261.87 - $312.00
Q2 2020	87,047	$23,289	$300.59	$257.60 - $350.24
Q1 2020	79,322	$25,096	$303.47	$262.25 - $374.99
Q4 2019	79,303	$23,532	$277.46	$219.70 - $318.00
Q3 2019	80,772	$18,805	$232.85	$215.78 - $246.99
Q2 2019	90,434	$21,150	$230.90	$219.20 - $245.35
Q1 2019	161,097	$38,080	$314.89	$216.12 - $344.00
Q4 2018	92,896	$27,954	$319.14	$278.46 - $358.41
Q3 2018	132,396	$46,777	$344.30	$288.13 - $388.67
Q2 2018	223,334	$64,820	$281.15	$249.17 - $310.91
Q1 2018	225,268	$61,683	$310.41	$259.76 - $370.57
Q4 2017	195,563	$62,301	$320.80	$301.81 - $348.84
Q3 2017	161,949	$50,709	$296.11	$269.50 - $330.00
Q2 2017	145,273	$39,421	$264.42	$244.28 - $291.90
Q1 2017	146,064	$39,937	$282.75	$260.50 - $301.42
Q4 2016	147,841	$41,925	$296.43	$268.00 - $329.83
Q3 2016	152,525	$47,745	$296.18	$240.07 - $333.65
Q2 2016	201,775	$48,793	$263.54	$223.02 - $292.69
Q1 2016	199,900	$52,038	$264.15	$242.07 - $301.02
Q4 2015	205,692	$63,014	$287.35	$254.00 - $311.65
Q3 2015	222,768	$65,006	$330.23	$265.00 - $412.24
Q2 2015	174,046	$70,304	$401.33	$368.88 - $432.88
Q1 2015	175,133	$73,948	$394.14	$334.40 - $480.18
Q4 2014	179,099	$60,795	$323.51	$290.85 - $361.93
Q3 2014	179,181	$59,275	$329.72	$298.31 - $349.00
Q2 2014	180,792	$57,006	$300.97	$272.02 - $322.25
Q1 2014	181,206	$55,425	$317.43	$270.62 - $358.89
Q4 2013	141,569	$39,604	$258.65	$221.07 - $298.82
Q3 2013	141,409	$34,046	$223.81	$203.55 - $248.95
Q2 2013	139,662	$30,055	$213.68	$191.80 - $242.64
Q1 2013	136,915	$26,412	$161.63	$139.72 - $192.92