Castle Biosciences (CSTL) FCF Margin (2018 - 2026)
Castle Biosciences (CSTL) posted FCF Margin of 11.90% for Q3 2026, up 2.52 percentage points from 9.39% a year earlier and up 5.58 percentage points from the prior quarter.
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Analysis
Castle Biosciences (CSTL) FCF Margin (2018 - 2026) Analysis & Trends
For the trailing twelve months through Sep 30, 2026, FCF Margin at Castle Biosciences was 1.05%, down 6.34 percentage points year-over-year; for FY2025, it was 8.23%, down 2.77 percentage points from FY2024.
- Annual FCF Margin shows a five-year change of +0.07 percentage points (FY2020 to FY2025).
- In prior years, Castle Biosciences' FCF Margin was 11.00% in FY2024 (+19.76 pp), -8.76% in FY2023 (+25.75 pp), -34.51% in FY2022 (-10.63 pp) and -23.88% in FY2021 (-32.04 pp).
- Quarterly FCF Margin has run from a low of -81.30% in Q1 2022 to a high of 117.86% in Q4 2021 over five years.
- On a year-over-year basis, FCF Margin increased in three of the last eight quarters, with an average year-over-year change of -5.28 percentage points.
- The strongest year-over-year quarter for FCF Margin in the past five years was Q2 2022, with a gain of 148.24 percentage points; the weakest was Q4 2022, with a drop of 138.17 percentage points.
- According to Business Quant data, FCF Margin for the three prior quarters was 6.33% (Q2 2026), -41.33% (Q1 2026) and 22.70% (Q4 2025).
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) | FCF Margin (Qtr) |
|---|---|---|---|---|---|
| 1 | HCA Healthcare | 105.29 Bn | 103.13 Bn | 17.03 Bn | 15.64% |
| 2 | Natera | 46.06 Bn | 41.68 Bn | 513.47 Mn | 0.66% |
| 3 | Labcorp Holdings | 30.09 Bn | 28.19 Bn | 1.11 Bn | 10.82% |
| 4 | Quest Diagnostics | 28.58 Bn | 26.66 Bn | 1.04 Bn | 14.37% |
| 5 | Guardant Health | 20.44 Bn | 16.05 Bn | 236.15 Mn | -10.30% |
| 6 | BrightSpring Health Services | 14.16 Bn | 11.04 Bn | 518.55 Mn | 4.33% |
| 7 | Encompass Health | 13.83 Bn | 14.29 Bn | 1.54 Bn | 7.92% |
| 8 | Tempus AI | 12.69 Bn | 9.84 Bn | 266.70 Mn | -0.03% |
| 9 | Davita | 11.06 Bn | 9.92 Bn | 1.13 Bn | 10.04% |
| 10 | Castle Biosciences | 1.04 Bn | -65.97 Mn | 78.97 Mn | 11.90% |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Sep 30, 2026 | 11.90% |
| Jun 30, 2026 | 6.33% |
| Mar 31, 2026 | -41.33% |
| Dec 31, 2025 | 22.70% |
| Sep 30, 2025 | 9.39% |
| Jun 30, 2025 | 13.41% |
| Mar 31, 2025 | -12.25% |
| Dec 31, 2024 | 19.46% |
| Sep 30, 2024 | 19.77% |
| Jun 30, 2024 | 21.57% |
| Mar 31, 2024 | -21.91% |
| Dec 31, 2023 | 22.37% |
| Sep 30, 2023 | 4.16% |
| Jun 30, 2023 | -15.60% |
| Mar 31, 2023 | -68.46% |
| Dec 31, 2022 | -20.31% |
| Sep 30, 2022 | -19.62% |
| Jun 30, 2022 | -29.87% |
| Mar 31, 2022 | -81.30% |
| Dec 31, 2021 | 117.86% |
API Access
Castle Biosciences FCF Margin API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=fcf-margin&ticker=CSTL&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "fcf-margin", "ticker": "CSTL", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=fcf-margin&ticker=CSTL&period=max&api_key=YOUR_API_KEY");
const data = await res.json();