Castle Biosciences (CSTL) Free Cash Flow (2018 - 2026)
Castle Biosciences' (CSTL) quarterly Free Cash Flow came in at $6.6 million in Q2 2026, down 43.32% year-over-year from $11.6 million in Q2 2025, and up 118.94% quarter-over-quarter from -$34.6 million in Q1 2026.
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Analysis
Castle Biosciences (CSTL) Free Cash Flow (2018 - 2026) Analysis & Trends
Castle Biosciences has disclosed Free Cash Flow across 9 years of filings, most recently posting $6.6 million for Q2 2026.
- In Q2 2026, Free Cash Flow fell 43.32% year-over-year to $6.6 million; the TTM figure through Jun 2026 stood at -$489000.0 (down 101.42% YoY), while the FY2025 annual figure was $28.3 million, down 22.48% from the prior year.
- Free Cash Flow came in at $6.6 million for Q2 2026 at Castle Biosciences, up from -$34.6 million in the prior quarter.
- In the past five years, Free Cash Flow ranged from a high of $19.7 million in Q4 2025 to a low of -$34.6 million in Q1 2026.
- Average Free Cash Flow over 5 years is -$1.7 million, with a median of -$2.4 million recorded in 2022.
- Year-over-year, Free Cash Flow plunged 398.33% in 2022 and soared 563.28% in 2024.
- Over 5 years, Free Cash Flow stood at -$7.8 million in 2022, then soared by 289.98% to $14.8 million in 2023, then advanced by 13.55% to $16.8 million in 2024, then gained by 17.56% to $19.7 million in 2025, then plunged by 66.83% to $6.6 million in 2026.
- Per Business Quant data, the three most recent Free Cash Flow figures were $6.6 million in Q2 2026, -$34.6 million in Q1 2026, and $19.7 million in Q4 2025.
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) | Free Cash Flow (Qtr) |
|---|---|---|---|---|---|
| 1 | Natera | 53.05 Bn | 51.95 Bn | 486.15 Mn | -8.64 Mn |
| 2 | Quest Diagnostics | 27.19 Bn | 26.87 Bn | 1.03 Bn | 459.00 Mn |
| 3 | Labcorp Holdings | 25.93 Bn | 25.81 Bn | 1.11 Bn | 313.90 Mn |
| 4 | Guardant Health | 23.97 Bn | 22.91 Bn | 219.03 Mn | -69.54 Mn |
| 5 | Tempus AI | 13.64 Bn | 12.82 Bn | 274.25 Mn | -13.65 Mn |
| 6 | Caris Life Sciences | 8.47 Bn | 7.68 Bn | 182.38 Mn | 6.40 Mn |
| 7 | Sotera Health | 5.35 Bn | 4.99 Bn | 177.96 Mn | 42.05 Mn |
| 8 | BillionToOne | 4.96 Bn | 4.41 Bn | 77.11 Mn | 5.09 Mn |
| 9 | Adaptive Biotechnologies | 4.55 Bn | 4.21 Bn | 51.39 Mn | -7.58 Mn |
| 10 | Castle Biosciences | 1.08 Bn | 811.36 Mn | 79.85 Mn | 6.55 Mn |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Jun 30, 2026 | 6.55 Mn |
| Mar 31, 2026 | -34.58 Mn |
| Dec 31, 2025 | 19.75 Mn |
| Sep 30, 2025 | 7.80 Mn |
| Jun 30, 2025 | 11.56 Mn |
| Mar 31, 2025 | -10.78 Mn |
| Dec 31, 2024 | 16.80 Mn |
| Sep 30, 2024 | 16.96 Mn |
| Jun 30, 2024 | 18.77 Mn |
| Mar 31, 2024 | -15.99 Mn |
| Dec 31, 2023 | 14.79 Mn |
| Sep 30, 2023 | 2.56 Mn |
| Jun 30, 2023 | -7.82 Mn |
| Mar 31, 2023 | -28.78 Mn |
| Dec 31, 2022 | -7.79 Mn |
| Sep 30, 2022 | -7.26 Mn |
| Jun 30, 2022 | -10.41 Mn |
| Mar 31, 2022 | -21.83 Mn |
| Dec 31, 2021 | 26.92 Mn |
| Sep 30, 2021 | -6.13 Mn |
API Access
Castle Biosciences Free Cash Flow 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=free-cash-flow&ticker=CSTL&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "free-cash-flow", "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=free-cash-flow&ticker=CSTL&period=max&api_key=YOUR_API_KEY");
const data = await res.json();