Quick Answer
BIOGEN INC. reported Shares Outstanding of 146.80 million shares for fiscal year 2025.
BIOGEN INC. Shares Outstanding — Annual History
| Fiscal Year | Shares Outstanding | YoY Change |
|---|---|---|
| 2025 | 146.80M | +0.7% |
| 2024 | 145.80M | +0.6% |
| 2023 | 144.90M | +0.6% |
| 2022 | 144.00M | -2.0% |
| 2021 | 147.00M | -46.5% |
| 2009 | 274.86M | -4.6% |
| 2008 | 288.05M | — |
- BIOGEN INC. showed an increase of +0.7% in Shares Outstanding compared to the prior fiscal year.
- Over the 2008–2025 period, BIOGEN INC.’s shares outstanding has declined by 49.0% (from 288.05 million shares to 146.80 million shares).
- The most recent figure is from BIOGEN INC.’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 6, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
Last verified: