Biogen Inc. Shares Outstanding 2007–2025
Biogen Inc. reported 146.8M of shares outstanding for fiscal 2025. That was 0.7% higher than fiscal 2024. Compared with fiscal 2020, the change was -3.7%. A rising share count can dilute per-share ownership; the filings should be checked for issuance and stock-compensation details.
| Fiscal year | Shares Outstanding | Change (YoY) |
|---|---|---|
| FY 2025 | 146.8M | +0.7% |
| FY 2024 | 145.8M | +0.6% |
| FY 2023 | 144.9M | +0.6% |
| FY 2022 | 144.0M | -2.0% |
| FY 2021 | 147.0M | -3.5% |
| FY 2020 | 152.4M | -12.5% |
| FY 2019 | 174.2M | -11.7% |
| FY 2018 | 197.2M | -6.8% |
| FY 2017 | 211.5M | -2.0% |
| FY 2016 | 215.9M | -1.2% |
| FY 2015 | 218.6M | -6.8% |
| FY 2014 | 234.6M | -0.7% |
| FY 2013 | 236.3M | -0.1% |
| FY 2012 | 236.6M | -2.3% |
| FY 2011 | 242.1M | +0.7% |
| FY 2010 | 240.5M | +87414.5% |
| FY 2009 | 0.3M | -99.9% |
| FY 2008 | 288.0M | — |
| FY 2007 | 0.0M | — |
Source: Biogen Inc. SEC filings — balance sheet (10-K), split-adjusted. Computed deterministically; refreshed nightly (last updated August 2, 2026). Open BIIB 10-K filings at SEC EDGAR · Methodology · Download CSV.
How to read this history
Biogen Inc. reported 146.8M of shares outstanding for fiscal 2025. That was 0.7% higher than fiscal 2024. Compared with fiscal 2020, the change was -3.7%. A rising share count can dilute per-share ownership; the filings should be checked for issuance and stock-compensation details. Values remain missing when the cached filing does not disclose a comparable line item; they are never estimated. Stock splits, reorganizations and fiscal-calendar changes can reduce comparability.
Prepared and reviewed by the stockportfolio.pro research desk. Corrections: support@stockportfolio.pro.
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What is Biogen Inc.'s shares outstanding?
Biogen Inc. (BIIB) reported shares outstanding of 146.8M for fiscal year 2025, per its SEC filings.
Where does this data come from?
Figures are computed from Biogen Inc.'s official SEC filings (balance sheet (10-K), split-adjusted), refreshed nightly. Not investment advice.
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