Castle Biosciences, Inc. (CSTL)

Castle Biosciences develops and commercializes molecular diagnostic tests that help clinicians assess risk and guide treatment decisions in oncology and related fields. Its best-known DecisionDx assays focus on skin cancers such as cutaneous melanoma, as well as other conditions where gene-expression profiling can refine prognosis. Tests are ordered by specialists and run in the company’s laboratories, placing it at the intersection of dermatology, oncology, and precision diagnostics.

Market
Nasdaq
Sector
Healthcare
Trend
Uptrend
Last close
32.91 (+0.8% on the day)
MA50
28.31
MA200
29.42
52-week range
18.15–43.04
Market cap
1B USD
Dividend yield
0%
Data as of
2026-09-04
Quarterly revenue and earnings, millions
QuarterRevenueYoY %EarningsYoY %
Q1 202588-25.9
Q2 202586.24.5
Q3 202583-0.5
Q4 202587-2.3
Q1 202683.7-4.9%-14.5
Q2 2026103.520.1%-2.1-145.5%

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