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Biogen (BIIB) Shares Outstanding (Weighted Average) (2016 - 2025)

Biogen has reported Shares Outstanding (Weighted Average) over the past 17 years, most recently at $146.5 million for Q4 2025.

  • Quarterly results put Shares Outstanding (Weighted Average) at $146.5 million for Q4 2025, up 0.62% from a year ago — trailing twelve months through Dec 2025 was $146.5 million (up 0.62% YoY), and the annual figure for FY2025 was $146.5 million, up 0.62%.
  • Shares Outstanding (Weighted Average) for Q4 2025 was $146.5 million at Biogen, roughly flat from $146.4 million in the prior quarter.
  • Over the last five years, Shares Outstanding (Weighted Average) for BIIB hit a ceiling of $151.9 million in Q1 2021 and a floor of $144.4 million in Q1 2023.
  • Median Shares Outstanding (Weighted Average) over the past 5 years was $146.0 million (2022), compared with a mean of $146.5 million.
  • Biggest five-year swings in Shares Outstanding (Weighted Average): fell 12.09% in 2021 and later rose 0.62% in 2024.
  • Biogen's Shares Outstanding (Weighted Average) stood at $149.1 million in 2021, then fell by 2.55% to $145.3 million in 2022, then fell by 0.41% to $144.7 million in 2023, then rose by 0.62% to $145.6 million in 2024, then increased by 0.62% to $146.5 million in 2025.
  • The last three reported values for Shares Outstanding (Weighted Average) were $146.5 million (Q4 2025), $146.4 million (Q3 2025), and $146.3 million (Q2 2025) per Business Quant data.