Biogen (BIIB) Shares Outstanding (Weighted Average) (2009 - 2026)

Biogen's Shares Outstanding (Weighted Average) history runs 18 years deep, the most recent figure standing at $147.2 million for Q1 2026.

• In Q1 2026, Shares Outstanding (Weighted Average) rose 0.75% year-over-year to $147.2 million; the TTM figure through Mar 2026 stood at $147.2 million (up 0.75% YoY), while the FY2025 annual figure was $146.5 million, up 0.62% from the prior year.
• Shares Outstanding (Weighted Average) was $147.2 million for Q1 2026 at Biogen, roughly flat from $146.5 million in the prior quarter.
• In the past five years, Shares Outstanding (Weighted Average) ranged from a high of $147.2 million in Q1 2026 to a low of $144.4 million in Q3 2022.
• Historically, Shares Outstanding (Weighted Average) has averaged $145.7 million across 5 years, with a median of $145.6 million in 2024.
• The sharpest annual moves came in 2022 and 2025: Shares Outstanding (Weighted Average) decreased 3.16% in 2022, then increased 0.76% in 2025.
• A 5-year view of Shares Outstanding (Weighted Average) shows it stood at $145.3 million in 2022, then decreased by 0.41% to $144.7 million in 2023, then advanced by 0.62% to $145.6 million in 2024, then gained by 0.62% to $146.5 million in 2025, then gained by 0.48% to $147.2 million in 2026.
• The last three Shares Outstanding (Weighted Average) figures came in at $147.2 million (Q1 2026), $146.5 million (Q4 2025), and $146.6 million (Q3 2025), per Business Quant data.