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CASTLE BIOSCIENCES INC

CSTL Clue Score48
United States Fiscal year ends December CIK 0001447362
$34.42 +2.11% Close, 9 Oct 2026
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Price $34.42 −43.55% Close, 9 Oct 2026

Closing prices at the end of each trading day, from 25 Jul 2019. Not a live quote. Adjusted for share splits, so the line has no step at a split; dividends are not added back. P/E and P/FCF are the market value over the last full fiscal year's net income or free cash flow, as public on each day, so they step once a year when the annual report comes out. A hatched band marks a stretch with none: a year of net loss, or of cash burnt.

Revenue and profit

What the business sells, and what is left of it. Point at a year for the detail.
RevenueOperating incomeNet income
Fiscal year 2018Revenue22.8Operating income−3.8Net income−6.4EPS, diluted−5.33Fiscal year 2019Revenue51.9 +127.6%Operating income7.3Net income5.3EPS, diluted−0.21Fiscal year 2020Revenue62.6 +20.8%Operating income−6.5Net income−10.3 −294.9%EPS, diluted−0.54Fiscal year 2021Revenue94.1 +50.2%Operating income−40.1Net income−31.3EPS, diluted−1.24Fiscal year 2022Revenue137.0 +45.7%Operating income−72.9Net income−67.1EPS, diluted−2.58Fiscal year 2023Revenue219.8 +60.4%Operating income−68.0Net income−57.5EPS, diluted−2.14Fiscal year 2024Revenue332.1 +51.1%Operating income8.7Net income18.2EPS, diluted0.62Fiscal year 2025Revenue344.2 +3.7%Operating income−42.8Net income−24.2 −232.4%EPS, diluted−0.83
FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Revenue 22.8 51.9 62.6 94.1 137.0 219.8 332.1 344.2
Growth +127.6% +20.8% +50.2% +45.7% +60.4% +51.1% +3.7%
Operating income −3.8 7.3 −6.5 −40.1 −72.9 −68.0 8.7 −42.8
Net income −6.4 5.3 −10.3 −31.3 −67.1 −57.5 18.2 −24.2
Growth −294.9% −232.4%
EPS, diluted −5.33 −0.21 −0.54 −1.24 −2.58 −2.14 0.62 −0.83

Margins

How much of each dollar of revenue it keeps. Point at a year for the detail.
Gross marginOperating marginNet margin
Fiscal year 2018Gross margin76.8%Operating margin−16.8%Net margin−27.9%Free cash flow margin−55.2%Fiscal year 2019Gross margin85.9%Operating margin14.1%Net margin10.2%Free cash flow margin11.7%Fiscal year 2020Gross margin84.5%Operating margin−10.4%Net margin−16.4%Free cash flow margin8.2%Fiscal year 2021Operating margin−42.6%Net margin−33.3%Free cash flow margin−23.9%Fiscal year 2022Operating margin−53.2%Net margin−49.0%Free cash flow margin−34.5%Fiscal year 2023Operating margin−30.9%Net margin−26.1%Free cash flow margin−8.8%Fiscal year 2024Operating margin2.6%Net margin5.5%Free cash flow margin11.0%Fiscal year 2025Operating margin−12.4%Net margin−7.0%Free cash flow margin8.2%
FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Gross margin 76.8% 85.9% 84.5% n/a n/a n/a n/a n/a
Operating margin −16.8% 14.1% −10.4% −42.6% −53.2% −30.9% 2.6% −12.4%
Net margin −27.9% 10.2% −16.4% −33.3% −49.0% −26.1% 5.5% −7.0%
Free cash flow margin −55.2% 11.7% 8.2% −23.9% −34.5% −8.8% 11.0% 8.2%

Cash flow

The cash the business makes, what it reinvests, and what it hands back. Point at a year for the detail.
Operating cash flowCapital expenditureFree cash flow
Fiscal year 2018Operating cash flow−12.3Capital expenditure−0.3Free cash flow−12.6Fiscal year 2019Operating cash flow7.0Capital expenditure−0.9Free cash flow6.1Fiscal year 2020Operating cash flow9.9Capital expenditure−4.8Free cash flow5.1 −15.9%Fiscal year 2021Operating cash flow−19.0Capital expenditure−3.5Free cash flow−22.5 −539.3%Fiscal year 2022Operating cash flow−41.7Capital expenditure−5.6Free cash flow−47.3Fiscal year 2023Operating cash flow−5.6Capital expenditure−13.6Free cash flow−19.2Fiscal year 2024Operating cash flow64.9Capital expenditure−28.3Free cash flow36.5Fiscal year 2025Operating cash flow64.3Capital expenditure−36.0Free cash flow28.3 −22.5%
FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Operating cash flow −12.3 7.0 9.9 −19.0 −41.7 −5.6 64.9 64.3
Capital expenditure −0.3 −0.9 −4.8 −3.5 −5.6 −13.6 −28.3 −36.0
Free cash flow −12.6 6.1 5.1 −22.5 −47.3 −19.2 36.5 28.3
Growth −15.9% −539.3% −22.5%

Balance sheet

What it holds against what it owes, at each year end. Point at a year for the detail.
CashTotal debt
Fiscal year 2018Cash4.5Total debt24.5Net cash (debt)−20.0Shareholders’ equity−56.6Fiscal year 2019Cash98.8Total debt25.1Net cash (debt)73.7Shareholders’ equity85.1Debt to equity0.30Fiscal year 2020Cash409.9Total debt0.0Net cash (debt)409.9Shareholders’ equity415.7Debt to equity0.00Fiscal year 2021Cash329.6Shareholders’ equity411.7Fiscal year 2022Cash122.9Shareholders’ equity399.2Fiscal year 2023Cash98.8Total debt0.0Net cash (debt)98.8Shareholders’ equity391.3Debt to equity0.00Fiscal year 2024Cash119.7Total debt10.0Net cash (debt)109.7Shareholders’ equity455.8Debt to equity0.02Fiscal year 2025Cash116.7Total debt10.1Net cash (debt)106.7Shareholders’ equity470.9Debt to equity0.02
FY2018FY2019FY2020FY2021FY2022FY2023FY2024FY2025
Cash 4.5 98.8 409.9 329.6 122.9 98.8 119.7 116.7
Total debt 24.5 25.1 0.0 n/a n/a 0.0 10.0 10.1
Net cash (debt) −20.0 73.7 409.9 n/a n/a 98.8 109.7 106.7
Shareholders’ equity −56.6 85.1 415.7 411.7 399.2 391.3 455.8 470.9
Debt to equity n/a 0.30 0.00 n/a n/a 0.00 0.02 0.02

In millions of USD, except per-share figures and ratios. Fiscal years, as last filed with the SEC.

Financial statements FY2025 · 10-K

Ratios

Percentages worked out from the filed figures; debt to equity in times. Fiscal years ending December, each column as last filed with the SEC.
Click a line to chart it
Fiscal year FY2018 31 Dec 2018 FY2019 31 Dec 2019 FY2020 31 Dec 2020 FY2021 31 Dec 2021 FY2022 31 Dec 2022 FY2023 31 Dec 2023 FY2024 31 Dec 2024 FY2025 31 Dec 2025
Margins
76.8% 85.9% 84.5% n/a n/a n/a n/a n/a
−16.8% 14.1% −10.4% −42.6% −53.2% −30.9% 2.6% −12.4%
−27.9% 10.2% −16.4% −33.3% −49.0% −26.1% 5.5% −7.0%
−55.2% 11.7% 8.2% −23.9% −34.5% −8.8% 11.0% 8.2%
Spending
21.3% 14.2% 21.2% 31.5% 32.8% 24.4% 15.7% 15.1%
72.3% 57.5% 76.8% 92.2% 104.4% 82.0% 60.2% 66.6%
1.2% 1.8% 7.6% 3.7% 4.1% 6.2% 8.5% 10.5%
Returns
n/a 6.2% −2.5% −7.6% −16.8% −14.7% 4.0% −5.1%
−28.4% 4.4% −2.3% −6.8% −15.0% −12.7% 3.4% −4.2%
Balance and payout
n/a 0.30 0.00 n/a n/a 0.00 0.02 0.02
144.9% 28.9% 5.4% 11.0% 10.8% 13.7% 14.2% 18.6%