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Castle Biosciences, Inc. (CSTL) Stock Grade

CSTL · Healthcare

C+
Grade updated: July 18, 2026
Computed by the GradeMyInvestments scoring model from revenue growth, profitability, balance-sheet strength, and analyst targets.
Market Cap
$1.1B
P/E Ratio
Revenue Growth (YoY)
+3.7%
Net Margin
-7.0%
Return on Equity
Dividend Yield
None

About Castle Biosciences, Inc.'s fundamentals

Castle Biosciences is a diagnostic company with a market capitalization of $1.1 billion that generated 3.7% year-over-year revenue growth in its latest period. The company is currently unprofitable with a net margin of -7.0% and reported a net loss in its latest annual statement, though it maintains positive free cash flow despite these accounting losses. The company does not pay a dividend and lacks sufficient earnings to calculate meaningful profitability ratios like P/E and return on equity.

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