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CASTLE BIOSCIENCES INC (CSTL) Annual Reports

Q: Where can I read CASTLE BIOSCIENCES INC (CSTL) annual reports?

Every year on this page links straight to the full text on SEC EDGAR. US annual reports are web pages (HTML) rather than PDFs, so you can read and search them in the browser. 3 filings are currently indexed.

Q: What is the difference between a 10-K and a 20-F?

A 10-K is the annual report of a US domestic issuer; a 20-F is filed by foreign private issuers (Taiwanese companies with US ADRs, such as TSMC, file 20-F). A 40-F applies to Canadian issuers under the MJDS.

CASTLE BIOSCIENCES INC is listed on Nasdaq, classified by the SEC under Services-Medical Laboratories (SIC 8071). This page indexes 3 annual reports, each linking to the full text on the SEC's EDGAR system.

Company profile

Exchange： Nasdaq
Fiscal year end： 12/31
SEC CIK： 1447362 →

Website：Official site ↗

Financial Highlights

FY2026 Q2 (quarterly, ended 2026-06-30)
	Current	Prior year	YoY
Revenue	$103.5M	$86.2M	+20.1%
Operating income	$-3.1M	$-4.3M	+27.8%
Net income	$-2.1M	$4.5M	-145.5%
EPS (diluted)	$-0.07	$0.15	-146.7%

Source: SEC EDGAR (XBRL company facts)

Financial history

Revenue & profit

Quarterly · In mn (USD)

Revenue 104 mn Net income -2.06 mn

Show table：Income statement

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
Revenue	3.66	3.98	3.71	11.4	8.72	10.7	14.8	17.6	17.4	12.7	15.2	17.3	22.8	22.8	23.5	25.0	26.9	34.8	37.0	38.3	42.0	50.1	61.5	66.1	73.0	87.0	85.8	86.3	88.0	86.2	83.0	87.0	83.7	104
Gross profit	2.41	2.65	2.36	10.1	7.12	8.75	13.1	15.6	15.0	10.6	12.7	14.6	19.8	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Operating income	—	-2.67	-2.85	4.77	-0.32	0.61	4.43	2.61	1.04	-0.64	-3.90	-3.03	-4.28	-8.81	-11.8	-15.2	-24.5	-3.97	-21.5	-22.8	-31.5	-21.2	-9.64	-5.66	-5.47	5.01	5.08	4.05	-27.9	-4.25	-6.80	-3.83	-18.4	-3.07
Net income	-3.63	-3.15	-3.45	3.87	-1.36	-1.27	5.85	2.06	0.57	-1.38	-4.59	-4.89	-4.28	-8.79	-11.8	-6.43	-24.6	-1.65	-20.3	-20.6	-29.2	-18.8	-6.90	-2.58	-2.53	8.92	2.27	9.59	-25.9	4.52	-0.5	-2.33	-14.5	-2.06

Balance sheet

Quarterly · In mn (USD)

Total assets 561 mn Total liabilities 91.2 mn

Equity = assets − liabilities. Balance-sheet figures are period-end balances, not cumulative.

Show table：Balance sheet

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
Current assets	—	—	—	18.1	—	28.5	110	117	117	196	201	430	427	392	390	354	336	305	299	292	271	269	280	296	296	320	345	360	349	349	358	361	329	341
Total assets	—	—	—	22.4	—	33.4	113	120	120	202	210	439	437	436	434	463	444	458	458	447	427	425	436	453	459	487	515	531	502	545	563	579	548	561
Current liabilities	—	—	—	6.74	—	11.8	9.24	15.3	15.3	28.2	30.2	20.9	17.6	18.6	21.0	24.9	39.5	27.5	31.9	36.1	30.1	33.7	36.3	47.7	32.0	39.5	44.3	49.4	37.3	50.9	55.3	68.7	48.8	56.5
Total liabilities	—	—	—	32.5	—	36.9	30.9	34.6	32.3	43.9	43.8	23.6	18.8	19.6	22.0	50.8	47.1	36.7	46.4	48.2	41.7	46.6	50.2	62.1	56.0	63.4	73.5	75.4	61.4	89.3	95.7	108	86.4	91.2
Equity	-53.9	-57.0	-60.5	-56.6	-49.4	-50.2	82.3	85.1	87.9	158	167	416	419	416	412	412	397	422	411	399	385	379	386	391	402	424	441	456	440	455	467	471	461	470

Cash flow

Quarterly · In mn (USD)

Operating 15.2 mn Investing -16.0 mn Financing -0.89 mn

Positive = cash in, negative = cash out.

Show table：Cash flow statement

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
Operating	—	-7.21	-1.88	-3.21	1.29	0.48	0.75	4.49	-0.25	13.5	-2.95	-0.43	-3.63	-6.44	-6.13	-2.78	-21.4	-9.00	-5.22	-6.00	-25.4	-3.79	5.01	18.6	-6.83	24.0	23.3	24.4	-6.04	20.8	22.6	26.9	-22.1	15.2
Investing	—	-0.18	-0.09	-0.01	-0.24	-0.18	-0.17	-0.35	-0.5	-1.76	-1.90	-0.59	-0.75	-34.1	-0.92	-30.9	-0.4	-27.5	-134	-4.48	16.6	-15.4	-9.71	-7.67	-19.7	-21.4	-14.8	5.77	-22.4	-28.4	-18.4	8.83	-25.8	-16.0
Financing	—	11.4	0.04	4.42	10.7	0.94	76.4	0.22	0.56	69.4	8.15	228	1.51	1.89	1.89	0.13	1.22	0.66	0.39	-0.75	0.73	0.23	0.05	-3.30	10.6	0.04	0.84	-5.38	-1.55	0.1	-0.92	-4.59	-5.03	-0.89
Cash at period end	—	5.21	3.28	4.48	16.2	17.5	94.5	98.8	98.7	180	183	410	407	368	363	330	309	273	134	123	115	95.9	91.2	98.8	83.0	85.6	95.0	120	89.7	82.2	85.6	117	63.8	62.1

Profitability

Quarterly · %

Gross margin 86.7% Operating margin -3.0% Net margin -2.0%

Gross, operating and net margin = the respective profit ÷ revenue.

Show table：Profitability

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
Gross margin	65.8%	66.7%	63.6%	88.1%	81.7%	81.4%	88.4%	88.6%	86.3%	83.1%	83.7%	84.5%	86.7%	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Operating margin	—	-67.0%	-76.8%	41.7%	-3.7%	5.7%	30.0%	14.8%	6.0%	-5.1%	-25.6%	-17.5%	-18.8%	-38.7%	-50.3%	-60.6%	-91.3%	-11.4%	-58.2%	-59.5%	-75.0%	-42.2%	-15.7%	-8.6%	-7.5%	5.8%	5.9%	4.7%	-31.7%	-4.9%	-8.2%	-4.4%	-22.0%	-3.0%
Net margin	-99.2%	-79.3%	-93.0%	33.8%	-15.6%	-11.8%	39.6%	11.7%	3.3%	-10.8%	-30.2%	-28.3%	-18.8%	-38.6%	-50.2%	-25.7%	-91.7%	-4.7%	-54.7%	-53.8%	-69.5%	-37.5%	-11.2%	-3.9%	-3.5%	10.3%	2.6%	11.1%	-29.4%	5.3%	-0.6%	-2.7%	-17.4%	-2.0%

Returns & leverage

Quarterly · %

ROE -4.2% ROA -3.5% Debt ratio 16.2%

ROE / ROA = trailing four-quarter net income ÷ average equity / total assets (annual mode: the year’s net income ÷ average of opening and closing). Not computed when the denominator is zero or negative.

Show table：Returns & leverage

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
ROE	—	—	—	—	—	—	64.8%	37.0%	37.4%	13.2%	-2.7%	-4.1%	-6.0%	-7.9%	-10.3%	-7.6%	-12.7%	-10.6%	-12.9%	-16.6%	-18.3%	-22.2%	-18.9%	-14.5%	-7.8%	-0.8%	1.5%	4.3%	-1.2%	-2.1%	-2.7%	-5.2%	-2.9%	-4.2%
ROA	—	—	—	-28.4%	—	-6.6%	6.3%	7.4%	6.0%	6.0%	-2.1%	-3.7%	-5.4%	-7.1%	-9.2%	-6.9%	-11.7%	-9.9%	-11.9%	-14.8%	-16.5%	-20.1%	-16.9%	-12.8%	-7.0%	-0.7%	1.3%	3.7%	-1.1%	-1.8%	-2.3%	-4.3%	-2.5%	-3.5%
Debt ratio	—	—	—	144.9%	—	110.8%	27.3%	28.9%	26.9%	21.8%	20.8%	5.4%	4.3%	4.5%	5.1%	11.0%	10.6%	8.0%	10.1%	10.8%	9.8%	11.0%	11.5%	13.7%	12.2%	13.0%	14.3%	14.2%	12.2%	16.4%	17.0%	18.6%	15.8%	16.2%

EPS

Quarterly · US$

EPS US$-0.07

Show table：EPS

Item	2018Q1	2018Q2	2018Q3	2018Q4	2019Q1	2019Q2	2019Q3	2019Q4	2020Q1	2020Q2	2020Q3	2020Q4	2021Q1	2021Q2	2021Q3	2021Q4	2022Q1	2022Q2	2022Q3	2022Q4	2023Q1	2023Q2	2023Q3	2023Q4	2024Q1	2024Q2	2024Q3	2024Q4	2025Q1	2025Q2	2025Q3	2025Q4	2026Q1	2026Q2
EPS（US$）	-2.37	-2.15	-2.33	0.38	-1.22	-1.05	0.05	0.11	0.03	-0.08	-0.23	-0.23	-0.17	-0.35	-0.47	-0.25	-0.97	-0.06	-0.77	-0.79	-1.10	-0.70	-0.26	-0.09	-0.09	0.31	0.08	0.32	-0.90	0.15	-0.02	-0.07	-0.49	-0.07

Revenue & profit

Year-to-date · In mn (USD)

Revenue 187 mn Net income -16.6 mn

Year-to-date = summed from the first quarter of the fiscal year; balance-sheet items are period-end balances.

Balance sheet

Year-to-date · In mn (USD)

Total assets 561 mn Total liabilities 91.2 mn

Equity = assets − liabilities. Balance-sheet figures are period-end balances, not cumulative.

Cash flow

Year-to-date · In mn (USD)

Operating -6.93 mn Investing -41.8 mn Financing -5.92 mn

Positive = cash in, negative = cash out.

Profitability

Year-to-date · %

Gross margin 86.7% Operating margin -11.5% Net margin -8.9%

Gross, operating and net margin = the respective profit ÷ revenue.

Returns & leverage

Year-to-date · %

ROE -4.2% ROA -3.5% Debt ratio 16.2%

EPS

Year-to-date · US$

EPS US$-0.56

Revenue & profit

Annual · In mn (USD)

Revenue 344 mn Net income -24.2 mn

Annual = sum of four quarters of a complete fiscal year (incomplete years are omitted); balance-sheet items are year-end balances.

Show table：Income statement

Item	2018	2019	2020	2021	2022	2023	2024	2025
Revenue	22.8	51.9	62.6	94.1	137	220	332	344
Gross profit	17.5	44.5	53.0	—	—	—	—	—
Operating income	—	7.33	-6.54	-40.1	-72.8	-68.0	8.67	-42.8
Net income	-6.37	5.28	-10.3	-31.3	-67.1	-57.5	18.3	-24.2

Balance sheet

Annual · In mn (USD)

Total assets 579 mn Total liabilities 108 mn

Equity = assets − liabilities. Balance-sheet figures are period-end balances, not cumulative.

Show table：Balance sheet

Item	2018	2019	2020	2021	2022	2023	2024	2025
Current assets	18.1	117	430	354	292	296	360	361
Total assets	22.4	120	439	463	447	453	531	579
Current liabilities	6.74	15.3	20.9	24.9	36.1	47.7	49.4	68.7
Total liabilities	32.5	34.6	23.6	50.8	48.2	62.1	75.4	108
Equity	-56.6	85.1	416	412	399	391	456	471

Cash flow

Annual · In mn (USD)

Operating 64.3 mn Investing -60.4 mn Financing -6.96 mn

Positive = cash in, negative = cash out.

Show table：Cash flow statement

Item	2018	2019	2020	2021	2022	2023	2024	2025
Operating	—	7.02	9.87	-19.0	-41.6	-5.63	64.9	64.3
Investing	—	-0.94	-4.75	-66.7	-167	-16.2	-50.1	-60.4
Financing	—	88.3	306	5.42	1.52	-2.30	6.14	-6.96
Cash at period end	4.48	98.8	410	330	123	98.8	120	117

Profitability

Annual · %

Gross margin 84.5% Operating margin -12.4% Net margin -7.0%

Gross, operating and net margin = the respective profit ÷ revenue.

Show table：Profitability

Item	2018	2019	2020	2021	2022	2023	2024	2025
Gross margin	76.8%	85.9%	84.5%	—	—	—	—	—
Operating margin	—	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%

Returns & leverage

Annual · %

ROE -5.2% ROA -4.3% Debt ratio 18.6%

Show table：Returns & leverage

Item	2018	2019	2020	2021	2022	2023	2024	2025
ROE	—	37.0%	-4.1%	-7.6%	-16.6%	-14.5%	4.3%	-5.2%
ROA	-28.4%	7.4%	-3.7%	-6.9%	-14.8%	-12.8%	3.7%	-4.3%
Debt ratio	144.9%	28.9%	5.4%	11.0%	10.8%	13.7%	14.2%	18.6%

EPS

Annual · US$

EPS US$-0.84

Show table：EPS

Item	2018	2019	2020	2021	2022	2023	2024	2025
EPS（US$）	-6.47	-2.11	-0.51	-1.24	-2.59	-2.15	0.62	-0.84

Source: SEC EDGAR (XBRL company facts)

Annual reports by year

	10-K
2025	Open full text →
2024	Open full text →
2023	Open full text →

10-K: annual report of a US domestic issuer. Filings are the original documents hosted on SEC EDGAR — this site neither mirrors nor edits them.

FAQ

Where can I read CASTLE BIOSCIENCES INC (CSTL) annual reports?

Every year in the table above links straight to the full text on SEC EDGAR. US annual reports are web pages (HTML) rather than PDFs, so you can read and search them in the browser without downloading anything. 3 filings are currently indexed.

What is the difference between a 10-K and a 20-F?

A 10-K is the annual report of a US domestic issuer, with sections fixed by law: Item 1 Business, Item 1A Risk Factors, Item 7 Management's Discussion and Analysis. A 20-F is filed by foreign private issuers — Taiwanese companies with US ADRs, such as TSMC, file 20-F rather than 10-K. A 40-F applies to Canadian issuers under the MJDS.

Are earnings call materials available here?

No. Earnings calls are not SEC filings, so US pages on this site cover annual reports only. Taiwan has a mandatory investor-conference disclosure regime, and those materials are indexed under Annual Reports.

Source: US Securities and Exchange Commission (SEC) EDGAR. This site indexes public filings and links to them; it hosts no copies, offers no investment advice, and makes no warranty as to timeliness or completeness.
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