Biogen (BIIB) Shares Outstanding (2009 - 2026)

Biogen's Shares Outstanding (Entity) history runs 18 years deep, the most recent figure standing at $171.5 million for Q2 2026.

• In Q2 2026, Shares Outstanding (Entity) rose 0.65% year-over-year to $171.5 million; the TTM figure through Jun 2026 stood at $171.5 million (up 0.65% YoY), while the FY2025 annual figure was $170.5 million, up 0.59% from the prior year.
• Shares Outstanding (Entity) for Q2 2026 stood at $171.5 million, roughly flat from $171.4 million in the prior quarter.
• The five-year high for Shares Outstanding (Entity) was $171.5 million in Q2 2026, with the low at $167.8 million in Q3 2022.
• The 5-year median for Shares Outstanding (Entity) is $169.5 million (2024), against an average of $169.6 million.
• The sharpest annual moves came in 2022 and 2026: Shares Outstanding (Entity) dropped 2.26% in 2022, then grew 0.65% in 2026.
• Biogen's Shares Outstanding (Entity) stood at $167.9 million in 2022, then gained by 0.48% to $168.7 million in 2023, then rose by 0.47% to $169.5 million in 2024, then climbed by 0.59% to $170.5 million in 2025, then advanced by 0.59% to $171.5 million in 2026.
• Business Quant data shows BIIB's Shares Outstanding (Entity) at $171.5 million in Q2 2026, $171.4 million in Q1 2026, and $170.5 million in Q4 2025.