BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Vanguard Personalized Indexing Management, LLC's Holding History (CIK: 0001767306)

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

Q4 2025

Shares 38,593 Value ($000) $6,792 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 38,674 Value ($000) $5,417 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 34,928 Value ($000) $4,387 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 21,702 Value ($000) $2,970 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 21,658 Value ($000) $3,312 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 11,299 Value ($000) $2,190 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 13,261 Value ($000) $3,074 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 10,406 Value ($000) $2,244 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 10,206 Value ($000) $2,641 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 10,731 Value ($000) $2,758 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 11,350 Value ($000) $3,233 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 10,114 Value ($000) $2,812 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 9,205 Value ($000) $2,549 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 7,267 Value ($000) $1,940 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 5,878 Value ($000) $1,199 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 3,174 Value ($000) $668 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 2,152 Value ($000) $516 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 2,973 Value ($000) $841 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 2,634 Value ($000) $912 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 1,422 Value ($000) $398 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 1,183 Value ($000) $290 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 1,042 Value ($000) $296 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 854 Value ($000) $228 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 1,199 Value ($000) $379 Avg Close $303.47 Range $262.25 - $374.99

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	38,593	$6,792	$163.37	$138.00 - $185.17
Q3 2025	38,674	$5,417	$135.17	$121.05 - $150.28
Q2 2025	34,928	$4,387	$124.60	$110.04 - $137.32
Q1 2025	21,702	$2,970	$142.96	$128.51 - $157.09
Q4 2024	21,658	$3,312	$168.67	$145.07 - $195.00
Q3 2024	11,299	$2,190	$209.21	$188.78 - $238.00
Q2 2024	13,261	$3,074	$217.32	$189.44 - $237.54
Q1 2024	10,406	$2,244	$234.20	$211.02 - $268.30
Q4 2023	10,206	$2,641	$245.62	$220.86 - $269.43
Q3 2023	10,731	$2,758	$267.47	$251.85 - $287.60
Q2 2023	11,350	$3,233	$297.86	$273.39 - $319.76
Q1 2023	10,114	$2,812	$276.70	$254.80 - $295.90
Q4 2022	9,205	$2,549	$282.44	$250.31 - $311.88
Q3 2022	7,267	$1,940	$212.38	$193.65 - $283.44
Q2 2022	5,878	$1,199	$204.43	$187.16 - $225.50
Q1 2022	3,174	$668	$217.46	$192.67 - $249.00
Q4 2021	2,152	$516	$257.12	$221.72 - $290.76
Q3 2021	2,973	$841	$327.75	$282.64 - $372.12
Q2 2021	2,634	$912	$302.94	$257.03 - $468.55
Q1 2021	1,422	$398	$269.69	$238.40 - $296.38
Q4 2020	1,183	$290	$259.08	$223.25 - $363.92
Q3 2020	1,042	$296	$278.91	$261.87 - $312.00
Q2 2020	854	$228	$300.59	$257.60 - $350.24
Q1 2020	1,199	$379	$303.47	$262.25 - $374.99