SuperworthCastle Biosciences shares outstanding CSTL
Diluted shares outstanding, averaged over each quarter, from 2018.
- Latest quarter, to Jun 30, 2026
- 30.4M
- On a year earlier
- +2.9%
- more shares
Castle Biosciences had 30.4M diluted shares outstanding on average in Q2 FY26, the quarter to Jun 30, 2026.
That is 2.9% 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 | 29.3M | −4% |
| FY2024 | 30.5M | +13% |
| FY2023 | 27M | +2% |
| FY2022 | 26.4M | +4% |
| FY2021 | 25.3M | +22% |
| FY2020 | 20.8M | +20% |
| FY2019 | 17.3M | +802% |
| FY2018 | 1.9M | n/a |
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 | 30.4M | +3% | |
| Q1 FY26 | 29.9M | +4% | |
| Q4 FY25 | 29.3M | −4% | |
| Q3 FY25 | 29.1M | −1% | |
| Q2 FY25 | 29.5M | +3% | |
| Q1 FY25 | 28.6M | +4% | |
| Q4 FY24 | 30.5M | +13% | |
| Q3 FY24 | 29.4M | +10% | |
| Q2 FY24 | 28.7M | +8% | |
| Q1 FY24 | 27.5M | +3% | |
| Q4 FY23 | 27M | +2% | |
| Q3 FY23 | 26.8M | +2% |
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 Castle Biosciences
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.