TotalMarketCap

Castle Biosciences

CSTLNasdaq United StatesHealth CareMedical Specialities

Market cap

$1.046 B

$34.25 -4.21%

Close of 6 Nov 2026

As of 6 Nov 2026, Castle Biosciences (CSTL) has a market capitalization of $1.05B. Market cap measures the value of outstanding equity at market prices; company totals combine applicable share classes. Prices and market caps come from Nasdaq, with financial fundamentals from SEC filings. See sources and calculation details.

Revenue

$344.2M

#2061 by revenue

Earnings

-$24.2M

Loss-making

Shares outstanding

30,818,291

Latest filing cover page

P/E ratio

—

Cap ÷ net income

Medical Specialities, ranked by market cap

All 44 →
  1. #28Lumexa ImagingLMRI$1.26B
  2. #29FreenomeFRNM$1.12B
  3. #30Castle BiosciencesCSTL$1.05B
  4. #31YD BioYDES$511.4M
  5. #32Fulgent GeneticsFLGT$511.0M

What if Castle Biosciences were worth as much as…

Open the what-if tool →

Gold $28.2T

$924,298.84

Per share 26,991× higher

Bitcoin $1.53T

$50,012.20

Per share 1,460× higher

Apple $5.02T

$164,185.39

Per share 4,794× higher

Or at a round number

$2.00B$5.00B$10.0B$20.0B

Where these numbers come from

Share counts and financials for Castle Biosciences are taken from its own SEC filings via EDGAR: public record, not an estimate. Market cap is shares outstanding multiplied by the latest close. Read the methodology.