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

Biogen has reported Shares Outstanding (Diluted Average) over the past 17 years, most recently at $147.1 million for Q4 2025.

  • Quarterly results put Shares Outstanding (Diluted Average) at $147.1 million for Q4 2025, up 0.82% from a year ago — trailing twelve months through Dec 2025 was $147.1 million (up 0.82% YoY), and the annual figure for FY2025 was $147.1 million, up 0.82%.
  • Shares Outstanding (Diluted Average) for Q4 2025 was $147.1 million at Biogen, roughly flat from $146.8 million in the prior quarter.
  • Over the last five years, Shares Outstanding (Diluted Average) for BIIB hit a ceiling of $152.3 million in Q1 2021 and a floor of $145.2 million in Q1 2023.
  • Median Shares Outstanding (Diluted Average) over the past 5 years was $146.2 million (2022), compared with a mean of $147.0 million.
  • Biggest five-year swings in Shares Outstanding (Diluted Average): dropped 12.02% in 2021 and later increased 0.82% in 2025.
  • Biogen's Shares Outstanding (Diluted Average) stood at $149.6 million in 2021, then fell by 2.41% to $146.0 million in 2022, then dropped by 0.27% to $145.6 million in 2023, then increased by 0.21% to $145.9 million in 2024, then rose by 0.82% to $147.1 million in 2025.
  • The last three reported values for Shares Outstanding (Diluted Average) were $147.1 million (Q4 2025), $146.8 million (Q3 2025), and $146.7 million (Q2 2025) per Business Quant data.