SuperworthCastle Biosciences market cap CSTL
Share price times shares outstanding: what the whole company sells for, since 2019.
- Today, Oct 23, 2026
- $1B
- Highest close in our data
- $1.9B
- Sep 2021
Castle Biosciences is worth $1B at the close on Oct 23, 2026, at $33.08 a share.
That is up 42% over the last year and down 36% over five years.
Its highest close in our data was $1.9B in Sep 2021.
Market cap over time
Year by year
| Year | End of year | Low | High | Change |
|---|---|---|---|---|
| 2026 so far | $1B | $580.2M | $1.2B | −12% |
| 2025 | $1.2B | $423M | $1.2B | +53% |
| 2024 | $751.4M | $480.4M | $932.4M | +29% |
| 2023 | $580.7M | $331.9M | $745.7M | −6% |
| 2022 | $620.3M | $420.2M | $1.2B | −43% |
| 2021 | $1.1B | $1B | $1.9B | −19% |
| 2020 | $1.3B | $413.8M | $1.4B | +130% |
| 2019 | $580.3M | $309.1M | $580.3M | n/a |
Against its peers
Companies in Medical - Diagnostics & Research nearest Castle Biosciences' size, closest first, today.
| Company | Market cap |
|---|---|
| CSTLCastle Biosciences | $1B |
| NRCNRC Health | $485.1M |
| CDNACareDx | $3.6B |
| VCYTVeracyte | $3.9B |
| BLLNBillionToOne | $5.1B |
| LNTHLantheus | $6.5B |
| CAICaris Life Sciences | $9B |
| BIOBio-Rad Laboratories | $9.9B |
| Peer median | $5.1B |
What the market cap tells you
Share price times shares outstanding: what the whole company sells for today.
Size, not quality. Large caps move slower and are covered more. That is all it tells you.
More on Castle Biosciences
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.