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Biogen (BIIB) Shares Outstanding (2016 - 2025)

Biogen has reported Shares Outstanding over the past 14 years, most recently at $146.8 million for Q4 2025.

  • Quarterly results put Shares Outstanding at $146.8 million for Q4 2025, down 13.39% from a year ago — trailing twelve months through Dec 2025 was $146.8 million (down 13.39% YoY), and the annual figure for FY2025 was $146.8 million, down 13.39%.
  • Shares Outstanding for Q4 2025 was $146.8 million at Biogen, down from $170.3 million in the prior quarter.
  • Over the last five years, Shares Outstanding for BIIB hit a ceiling of $172.9 million in Q2 2021 and a floor of $144.9 million in Q4 2023.
  • Median Shares Outstanding over the past 4 years was $168.7 million (2023), compared with a mean of $166.9 million.
  • Biggest five-year swings in Shares Outstanding: decreased 5.05% in 2021 and later rose 0.69% in 2025.
  • Biogen's Shares Outstanding stood at $170.7 million in 2021, then dropped by 1.7% to $167.8 million in 2022, then decreased by 13.65% to $144.9 million in 2023, then rose by 0.62% to $145.8 million in 2024, then rose by 0.69% to $146.8 million in 2025.
  • The last three reported values for Shares Outstanding were $146.8 million (Q4 2025), $170.5 million (Q3 2025), and $145.8 million (Q4 2024) per Business Quant data.