Castle Biosciences (CSTL) Cash Flow: Operating & Free Cash Flow

Castle Biosciences Cash Flow Statement Analysis

Values in millions USD

Income Statement Balance Sheet Cash Flow Ratios

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Cash flow statement showing operating, investing, and financing activities for Castle Biosciences, Inc. (CSTL) - Annual data in millions USD
Breakdown	FY 2025	FY 2024	FY 2023	FY 2022	FY 2021	FY 2020	FY 2019	FY 2018	FY 2017
Period ending	Dec 2025	Dec 2024	Dec 2023	Dec 2022	Dec 2021	Dec 2020	Dec 2019	Dec 2018	Dec 2017
Operating Activities
Net Income	-24.16	18.25	-57.47	-67.14	-31.29	-10.28	5.28	-6.37	-12.37
Depreciation & Amortization	40.77	16.00	12.33	10.54	3.41	0.47	0.36	0.32	0.31
Deferred Income Tax	-6.23	1.40	-0.22	-1.88	-8.74	0.00	-2.28	0.27	-0.16
Stock Based Compensation	45.89	50.32	51.22	36.32	21.74	8.31	1.25	0.29	0.11
Change in Working Capital	13.60	-14.13	-6.63	-0.01	-4.10	9.15	0.04	-7.36	-0.64
Change in Accounts Receivable	6.88	-12.64	-14.93	-6.22	-4.63	1.66	-0.90	-8.41	-0.43
Change in Inventory	-2.14	-0.19	-3.96	-1.68	0.33	-0.98	-0.36	-0.58	-0.12
Change in Accounts Payable	3.08	-4.37	5.71	0.58	-0.18	0.17	0.56	0.20	0.37
Change in Other Working Capital	5.79	-0.85	6.56	7.31	0.38	8.30	0.74	1.43	-0.47
Other Operating Activities	-5.53	-5.57	-4.86	-19.50	0.00	1.38	2.37	0.54	0.52
Net Cash from Operating Activities	64.35	64.87	-5.63	-41.66	-18.98	9.87	7.02	-12.29	-12.23
Investing Activities
Capital Expenditures	-36.02	-28.33	-13.62	-5.63	-3.48	-4.75	-0.94	-0.28	-0.49
Acquisitions	-18.73	0.02	0.00	-26.97	-63.18	0.00	0.00	0.00	0.00
Purchases of Investments	-188.71	-205.73	-189.08	-134.69	0.00	0.00	0.00	0.00	0.00
Sales/Maturities of Investments	190.73	183.90	186.50	0.00	0.00	0.00	0.00	0.00	0.00
Other Investing Activities	-7.64	0.00	0.01	0.74	0.01	0.00	0.00	0.00	0.00
Net Cash from Investing Activities	-60.37	-50.14	-16.18	-166.55	-66.66	-4.75	-0.94	-0.28	-0.49
Financing Activities
Debt Repayment	-0.12	-0.10	-0.14	-0.12	-0.01	-27.36	20.92	5.42	8.57
Common Stock Issued	2.21	5.00	0.00	0.00	0.00	333.25	65.93	10.42	0.29
Common Stock Repurchased	0.00	-8.76	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Other Financing Activities	-9.05	-0.10	-2.16	1.64	5.43	3.21	1.44	10.38	0.29
Net Cash from Financing Activities	-6.96	6.14	-2.30	1.52	5.42	305.89	88.29	15.84	8.87
Summary
Net Change in Cash	-2.98	20.87	-24.11	-206.69	-80.22	311.01	94.37	3.27	-3.86
Cash at Beginning of Period	119.71	98.84	122.95	329.63	409.85	98.85	4.48	1.21	5.07
Cash at End of Period	116.73	119.71	98.84	122.95	329.63	409.85	98.85	4.48	1.21
Free Cash Flow	28.33	36.54	-19.25	-47.29	-22.47	5.11	6.08	-12.57	-12.73
Supplemental Disclosures
Interest Paid	-	0.43	0.01	0.02	0.00	1.98	-	-	-
Income Taxes Paid	-	2.50	0.20	0.12	0.02	0.10	-	-	-

Source: Company financial statements from annual and quarterly filings. Data as of Jun 30, 2026. Data sources and methodology

Frequently Asked Questions About Castle Biosciences Cash Flow

What is Castle Biosciences's free cash flow?

Castle Biosciences generated free cash flow of $28.33M in fiscal 2025 (fiscal year ended Dec 31, 2025), operating cash flow of $64.35M minus $36.02M of capital expenditures. That was down 22.5% from $36.54M a year earlier. Free cash flow equaled 8.2% of revenue.

How much does Castle Biosciences spend on capital expenditures?

Castle Biosciences spent $36.02M on capital expenditures in fiscal 2025, compared with $28.33M a year earlier. That equals 56.0% of operating cash flow.

Does Castle Biosciences pay dividends or buy back shares?

Castle Biosciences's cash flow statement for fiscal 2025 shows no dividend payments or share repurchases.

What is free cash flow?

Free cash flow is operating cash flow minus capital expenditures. It is the cash a company has left for dividends, buybacks, debt repayment or acquisitions after funding its operations and investment. Full definition