BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

VIRGINIA RETIREMENT SYSTEMS ET AL's Holding History (CIK: 0001005354)

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

Q3 2023

Shares 198,804 Value ($000) $51,095 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 184,604 Value ($000) $52,584 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 170,304 Value ($000) $47,350 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 28,700 Value ($000) $7,948 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 33,900 Value ($000) $9,051 Avg Close $212.38 Range $193.65 - $283.44

Q4 2021

Shares 4,600 Value ($000) $1,104 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 4,600 Value ($000) $1,302 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 3,700 Value ($000) $1,281 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 4,400 Value ($000) $1,231 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 113,000 Value ($000) $27,669 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 122,300 Value ($000) $34,694 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 126,300 Value ($000) $33,792 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 70,200 Value ($000) $22,210 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 71,200 Value ($000) $21,127 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 197,300 Value ($000) $45,935 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 194,500 Value ($000) $45,488 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 176,200 Value ($000) $41,650 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 78,100 Value ($000) $23,502 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 46,500 Value ($000) $16,429 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 70,300 Value ($000) $20,404 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 107,100 Value ($000) $29,326 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 107,100 Value ($000) $34,119 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 107,900 Value ($000) $33,786 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 104,000 Value ($000) $28,221 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 104,000 Value ($000) $28,436 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 96,000 Value ($000) $27,224 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 96,000 Value ($000) $30,051 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 84,400 Value ($000) $20,410 Avg Close $263.54 Range $223.02 - $292.69

Q4 2015

Shares 42,300 Value ($000) $12,959 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 22,054 Value ($000) $6,436 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 74,592 Value ($000) $30,131 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 86,920 Value ($000) $36,701 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 90,560 Value ($000) $30,741 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 81,979 Value ($000) $27,119 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 73,919 Value ($000) $23,307 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 76,990 Value ($000) $23,549 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 80,220 Value ($000) $22,427 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 129,297 Value ($000) $31,130 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 162,229 Value ($000) $34,912 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2023	198,804	$51,095	$267.47	$251.85 - $287.60
Q2 2023	184,604	$52,584	$297.86	$273.39 - $319.76
Q1 2023	170,304	$47,350	$276.70	$254.80 - $295.90
Q4 2022	28,700	$7,948	$282.44	$250.31 - $311.88
Q3 2022	33,900	$9,051	$212.38	$193.65 - $283.44
Q4 2021	4,600	$1,104	$257.12	$221.72 - $290.76
Q3 2021	4,600	$1,302	$327.75	$282.64 - $372.12
Q2 2021	3,700	$1,281	$302.94	$257.03 - $468.55
Q1 2021	4,400	$1,231	$269.69	$238.40 - $296.38
Q4 2020	113,000	$27,669	$259.08	$223.25 - $363.92
Q3 2020	122,300	$34,694	$278.91	$261.87 - $312.00
Q2 2020	126,300	$33,792	$300.59	$257.60 - $350.24
Q1 2020	70,200	$22,210	$303.47	$262.25 - $374.99
Q4 2019	71,200	$21,127	$277.46	$219.70 - $318.00
Q3 2019	197,300	$45,935	$232.85	$215.78 - $246.99
Q2 2019	194,500	$45,488	$230.90	$219.20 - $245.35
Q1 2019	176,200	$41,650	$314.89	$216.12 - $344.00
Q4 2018	78,100	$23,502	$319.14	$278.46 - $358.41
Q3 2018	46,500	$16,429	$344.30	$288.13 - $388.67
Q2 2018	70,300	$20,404	$281.15	$249.17 - $310.91
Q1 2018	107,100	$29,326	$310.41	$259.76 - $370.57
Q4 2017	107,100	$34,119	$320.80	$301.81 - $348.84
Q3 2017	107,900	$33,786	$296.11	$269.50 - $330.00
Q2 2017	104,000	$28,221	$264.42	$244.28 - $291.90
Q1 2017	104,000	$28,436	$282.75	$260.50 - $301.42
Q4 2016	96,000	$27,224	$296.43	$268.00 - $329.83
Q3 2016	96,000	$30,051	$296.18	$240.07 - $333.65
Q2 2016	84,400	$20,410	$263.54	$223.02 - $292.69
Q4 2015	42,300	$12,959	$287.35	$254.00 - $311.65
Q3 2015	22,054	$6,436	$330.23	$265.00 - $412.24
Q2 2015	74,592	$30,131	$401.33	$368.88 - $432.88
Q1 2015	86,920	$36,701	$394.14	$334.40 - $480.18
Q4 2014	90,560	$30,741	$323.51	$290.85 - $361.93
Q3 2014	81,979	$27,119	$329.72	$298.31 - $349.00
Q2 2014	73,919	$23,307	$300.97	$272.02 - $322.25
Q1 2014	76,990	$23,549	$317.43	$270.62 - $358.89
Q4 2013	80,220	$22,427	$258.65	$221.07 - $298.82
Q3 2013	129,297	$31,130	$223.81	$203.55 - $248.95
Q2 2013	162,229	$34,912	$213.68	$191.80 - $242.64