SuperworthBiogen shares outstanding BIIB
Diluted shares outstanding, averaged over each quarter, from 2008.
- Latest quarter, to Jun 30, 2026
- 148.7M
- On a year earlier
- +1.4%
- more shares
Biogen had 148.7M diluted shares outstanding on average in Q2 FY26, the quarter to Jun 30, 2026.
That is 1.4% more than a year earlier, so each share owns a little less of the company.
Shares outstanding over time
Fiscal year by fiscal year
| Fiscal year | Shares, fourth quarter | Change |
|---|---|---|
| FY2025 | 146.8M | +1% |
| FY2024 | 145.6M | −0% |
| FY2023 | 145.9M | +0% |
| FY2022 | 145.4M | −1% |
| FY2021 | 147.5M | −4% |
| FY2020 | 154M | −14% |
| FY2019 | 178.2M | −11% |
| FY2018 | 200.3M | −6% |
| FY2017 | 212M | −2% |
| FY2016 | 217M | −2% |
| FY2015 | 220.8M | −7% |
| FY2014 | 236.3M | −1% |
| FY2013 | 237.7M | −0% |
| FY2012 | 238.6M | −3% |
| FY2011 | 244.7M | +1% |
Each fiscal year is the twelve months to its fourth quarter, shown as the fourth quarter's average share count.
Quarter by quarter
| Quarter | Ended | Shares outstanding | On a year earlier |
|---|---|---|---|
| Q2 FY26 | 148.7M | +1% | |
| Q1 FY26 | 148.4M | +1% | |
| Q4 FY25 | 146.8M | +1% | |
| Q3 FY25 | 147.1M | +1% | |
| Q2 FY25 | 146.7M | +1% | |
| Q1 FY25 | 146.6M | +0% | |
| Q4 FY24 | 145.6M | −0% | |
| Q3 FY24 | 146.1M | +1% | |
| Q2 FY24 | 145.9M | +0% | |
| Q1 FY24 | 145.9M | +0% | |
| Q4 FY23 | 145.9M | +0% | |
| Q3 FY23 | 144.8M | +0% |
What the shares outstanding tells you
Diluted shares outstanding, averaged over the period. Fewer shares means each one owns more of the company.
A falling count usually means buybacks. A rising one means stock pay, acquisitions paid in shares or new shares sold.
More on Biogen
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.