BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

WestEnd Advisors, LLC's Holding History (CIK: 0001351731)

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

Q4 2025
Shares 12 Value ($000) $2 Avg Close $163.37 Range $138.00 - $185.17
Q3 2025
Shares 4 Value ($000) $1 Avg Close $135.17 Range $121.05 - $150.28
Q2 2025
Shares 6 Value ($000) $1 Avg Close $124.60 Range $110.04 - $137.32
Q1 2025
Shares 6 Value ($000) $1 Avg Close $142.96 Range $128.51 - $157.09
Q4 2024
Shares 2 Value ($000) $0 Avg Close $168.67 Range $145.07 - $195.00
Q3 2024
Shares 2 Value ($000) $0 Avg Close $209.21 Range $188.78 - $238.00
Q2 2024
Shares 2 Value ($000) $0 Avg Close $217.32 Range $189.44 - $237.54
Q1 2024
Shares 2 Value ($000) $0 Avg Close $234.20 Range $211.02 - $268.30
Q4 2023
Shares 2 Value ($000) $1 Avg Close $245.62 Range $220.86 - $269.43
Q3 2023
Shares 2 Value ($000) $1 Avg Close $267.47 Range $251.85 - $287.60
Q1 2023
Shares 2 Value ($000) $1 Avg Close $276.70 Range $254.80 - $295.90
Q4 2022
Shares 2 Value ($000) $1 Avg Close $282.44 Range $250.31 - $311.88
Q3 2022
Shares 2 Value ($000) $1 Avg Close $212.38 Range $193.65 - $283.44
Q2 2022
Shares 2 Value ($000) $407 Avg Close $204.43 Range $187.16 - $225.50
Q1 2022
Shares 1 Value ($000) $210 Avg Close $217.46 Range $192.67 - $249.00
Q4 2021
Shares 1 Value ($000) $239 Avg Close $257.12 Range $221.72 - $290.76
Q3 2021
Shares 1 Value ($000) $282 Avg Close $327.75 Range $282.64 - $372.12
Q2 2021
Shares 1 Value ($000) $346 Avg Close $302.94 Range $257.03 - $468.55
Q1 2019
Shares 109,859 Value ($000) $25,968,470 Avg Close $314.89 Range $216.12 - $344.00
Q4 2018
Shares 108,238 Value ($000) $32,570,978 Avg Close $319.14 Range $278.46 - $358.41
Q3 2018
Shares 104,745 Value ($000) $37,007,455 Avg Close $344.30 Range $288.13 - $388.67
Q2 2018
Shares 123,613 Value ($000) $35,877,437 Avg Close $281.15 Range $249.17 - $310.91
Q1 2018
Shares 132,787 Value ($000) $36,359,736 Avg Close $310.41 Range $259.76 - $370.57
Q4 2017
Shares 138,348 Value ($000) $44,073,522 Avg Close $320.80 Range $301.81 - $348.84
Q3 2017
Shares 179,058 Value ($000) $56,066,641 Avg Close $296.11 Range $269.50 - $330.00
Q2 2017
Shares 189,630 Value ($000) $51,457,996 Avg Close $264.42 Range $244.28 - $291.90
Q1 2017
Shares 204,754 Value ($000) $55,983,839 Avg Close $282.75 Range $260.50 - $301.42
Q4 2016
Shares 196,359 Value ($000) $55,683,485 Avg Close $296.43 Range $268.00 - $329.83
Q3 2016
Shares 225,669 Value ($000) $70,641,167 Avg Close $296.18 Range $240.07 - $333.65