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Castle Biosciences, Inc. CSTL

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35.75 USD +0.61 (+1.74%)

At closeNov 4, 2026, 4:00 PM EST

35.75 0.00 0.00%

After hours · Nov 4, 4:00 PM ET

35.07 Day range 36.43
17.72 52-week range 44.28
YTD
-8.10%
1 year
+13.03%

Financial health

Altman Z-Score

7.72 Safe zone

Bankruptcy-risk model: below 1.81 distress, above 2.99 safe.

Piotroski F-Score

3 / 9 Weak

Nine pass/fail tests of profitability, leverage and efficiency.

FMP rating

B-2 / 5 overall

  • DCF 4
  • Return on Equity 1
  • Return on Assets 1
  • Debt / Equity 3
  • P/E 1
  • P/B 4

Valuation

P/E -46.9×
FY 2017: -17.0×FY 2018: -35.7×FY 2019: 98.2×FY 2020: -124×FY 2021: -34.6×FY 2022: -9.1×FY 2023: -10.1×FY 2024: 40.4×FY 2025: -46.9×
FY 2017 5y median -10.1× FY 2025
P/S 3.3×
FY 2017: 15.2×FY 2018: 10.0×FY 2019: 5.7×FY 2020: 20.3×FY 2021: 11.5×FY 2022: 4.5×FY 2023: 2.6×FY 2024: 2.2×FY 2025: 3.3×
FY 2017 5y median 3.3× FY 2025
P/B 2.4×
FY 2017: -14.7×FY 2018: -22.6×FY 2019: 3.5×FY 2020: 3.1×FY 2021: 2.6×FY 2022: 1.5×FY 2023: 1.5×FY 2024: 1.6×FY 2025: 2.4×
FY 2017 5y median 1.6× FY 2025
P/FCF 39.8×
FY 2017: -16.4×FY 2018: -18.1×FY 2019: 48.5×FY 2020: 249×FY 2021: -48.0×FY 2022: -13.0×FY 2023: -30.1×FY 2024: 20.3×FY 2025: 39.8×
FY 2017 5y median -13.0× FY 2025
EV/EBITDA 92.4×
FY 2017: -21.8×FY 2018: -65.9×FY 2019: 21.5×FY 2020: -121×FY 2021: -20.7×FY 2022: -8.6×FY 2023: -11.0×FY 2024: 17.0×FY 2025: 92.4×
FY 2017 5y median -8.6× FY 2025
EV/Sales 3.0×
FY 2017: 16.5×FY 2018: 10.9×FY 2019: 4.3×FY 2020: 13.7×FY 2021: 8.0×FY 2022: 3.7×FY 2023: 2.3×FY 2024: 1.9×FY 2025: 3.0×
FY 2017 5y median 3.0× FY 2025
FCF Yield 2.5%
FY 2017: -6.1%FY 2018: -5.5%FY 2019: 2.1%FY 2020: 0.4%FY 2021: -2.1%FY 2022: -7.7%FY 2023: -3.3%FY 2024: 4.9%FY 2025: 2.5%
FY 2017 5y median -2.1% FY 2025

Profitability

Gross Margin 79.4%
FY 2017: 64.2%FY 2018: 76.8%FY 2019: 85.9%FY 2020: 84.5%FY 2021: 83.2%FY 2022: 76.6%FY 2023: 79.5%FY 2024: 81.9%FY 2025: 79.4%
FY 2017 5y median 79.5% FY 2025
Operating Margin -12.4%
FY 2017: -79.2%FY 2018: -16.8%FY 2019: 14.1%FY 2020: -10.4%FY 2021: -42.6%FY 2022: -53.2%FY 2023: -30.9%FY 2024: 2.6%FY 2025: -12.4%
FY 2017 5y median -30.9% FY 2025
Net Margin -7.0%
FY 2017: -89.9%FY 2018: -27.9%FY 2019: 10.2%FY 2020: -16.4%FY 2021: -33.3%FY 2022: -49.0%FY 2023: -26.1%FY 2024: 5.5%FY 2025: -7.0%
FY 2017 5y median -26.1% FY 2025
ROE -5.1%
FY 2017: 86.7%FY 2018: 63.2%FY 2019: 6.2%FY 2020: -2.5%FY 2021: -7.6%FY 2022: -16.8%FY 2023: -14.7%FY 2024: 4.0%FY 2025: -5.1%
FY 2017 5y median -7.6% FY 2025
ROIC -6.8%
FY 2017: -194.5%FY 2018: -24.5%FY 2019: 6.6%FY 2020: -1.6%FY 2021: -7.1%FY 2022: -17.2%FY 2023: -16.7%FY 2024: 1.5%FY 2025: -6.8%
FY 2017 5y median -7.1% FY 2025
ROA -4.2%
FY 2017: -126.0%FY 2018: -28.4%FY 2019: 4.4%FY 2020: -2.3%FY 2021: -6.8%FY 2022: -15.0%FY 2023: -12.7%FY 2024: 3.4%FY 2025: -4.2%
FY 2017 5y median -6.8% FY 2025

Growth (YoY)

Revenue 3.7%
FY 2017: 0.0%FY 2018: 65.7%FY 2019: 127.6%FY 2020: 20.8%FY 2021: 50.2%FY 2022: 45.7%FY 2023: 60.4%FY 2024: 51.1%FY 2025: 3.7%
FY 2017 FY 2025
Operating Income -593.8%
FY 2017: 0.0%FY 2018: 64.8%FY 2019: 291.1%FY 2020: -189.3%FY 2021: -512.6%FY 2022: -81.8%FY 2023: 6.7%FY 2024: 112.8%FY 2025: -593.8%
FY 2017 FY 2025
EPS (diluted) -233.9%
FY 2017: 0.0%FY 2018: 52.4%FY 2019: 65.0%FY 2020: -157.1%FY 2021: -129.6%FY 2022: -108.1%FY 2023: 17.1%FY 2024: 129.0%FY 2025: -233.9%
FY 2017 FY 2025
Free Cash Flow -22.5%
FY 2017: 0.0%FY 2018: 1.2%FY 2019: 148.3%FY 2020: -15.9%FY 2021: -539.3%FY 2022: -110.5%FY 2023: 59.3%FY 2024: 289.8%FY 2025: -22.5%
FY 2017 FY 2025

Financial Health

Current Ratio 5.3×
FY 2017: 1.3×FY 2018: 2.7×FY 2019: 7.6×FY 2020: 20.6×FY 2021: 14.2×FY 2022: 8.1×FY 2023: 6.2×FY 2024: 7.3×FY 2025: 5.3×
FY 2017 5y median 7.3× FY 2025
Quick Ratio 5.1×
FY 2017: 1.2×FY 2018: 2.6×FY 2019: 7.6×FY 2020: 20.5×FY 2021: 14.1×FY 2022: 8.0×FY 2023: 6.0×FY 2024: 7.1×FY 2025: 5.1×
FY 2017 5y median 7.1× FY 2025
Debt / Equity 0.1×
FY 2017: -1.3×FY 2018: -2.4×FY 2019: 0.3×FY 2020: 0.0×FY 2021: 0.0×FY 2022: 0.0×FY 2023: 0.0×FY 2024: 0.1×FY 2025: 0.1×
FY 2017 5y median 0.0× FY 2025
Net Debt / EBITDA -7.0×
FY 2017: -1.7×FY 2018: -5.3×FY 2019: -7.2×FY 2020: 57.8×FY 2021: 8.8×FY 2022: 1.9×FY 2023: 1.9×FY 2024: -2.4×FY 2025: -7.0×
FY 2017 5y median 1.9× FY 2025
Interest Coverage -498×
FY 2017: -6.6×FY 2018: -1.7×FY 2019: 1.6×FY 2020: -2.5×FY 2021: -40079×FY 2022: -4286×FY 2023: -6180×FY 2024: 15.0×FY 2025: -498×
FY 2017 5y median -4286× FY 2025

Dividends

Dividend Yield 0.0%
FY 2017: 0.0%FY 2018: 0.0%FY 2019: 0.0%FY 2020: 0.0%FY 2021: 0.0%FY 2022: 0.0%FY 2023: 0.0%FY 2024: 0.0%FY 2025: 0.0%
FY 2017 5y median 0.0% FY 2025
Payout Ratio 0.0%
FY 2017: 0.0%FY 2018: 0.0%FY 2019: 0.0%FY 2020: 0.0%FY 2021: 0.0%FY 2022: 0.0%FY 2023: 0.0%FY 2024: 0.0%FY 2025: 0.0%
FY 2017 5y median 0.0% FY 2025

Annual · latest fiscal year ends 2025-12-31