CSTL · Nasdaq · CIK 0001447362

CASTLE BIOSCIENCES INC

CASTLE BIOSCIENCES INC’s most recent SEC filing in our snapshot is a Form 4 filed on Oct 21, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $344.2M and net income of -$24.2M, according to its XBRL data on EDGAR. Its EDGAR record lists 87 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$344.2M
Net income, FY2025
-$24.2M
Form 4 filings on record, past 12 months
87

Company overview

Legal name (as filed)
CASTLE BIOSCIENCES INC
Ticker
CSTL
SEC Central Index Key (CIK)
0001447362
Industry (SIC)
Services-Medical Laboratories (code 8071)
Business address
FRIENDSWOOD, TX
State or country of incorporation
DE
Fiscal year ends
December 31
SEC filer category
Accelerated filer
Position in SEC ticker list
#2426 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from CASTLE BIOSCIENCES INC’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$94.1MFY2021$137.0MFY2022$219.8MFY2023$332.1MFY2024$344.2MFY2025
Net income
-$31.3MFY2021-$67.1MFY2022-$57.5MFY2023$18.2MFY2024-$24.2MFY2025
CSTL annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$94.1M$137.0M$219.8M$332.1M$344.2M
Net income-$31.3M-$67.1M-$57.5M$18.2M-$24.2M
Diluted EPS-$1.24-$2.58-$2.14$0.62-$0.83
Total assets$462.6M$447.3M$453.3M$531.2M$578.6M
Cash and equivalents$329.6M$122.9M$98.8M$119.7M$116.7M

XBRL tags used: revenue = RevenueFromContractWithCustomerExcludingAssessedTax; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashAndCashEquivalentsAtCarryingValue. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

CSTL latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 26, 202610-KAnnual report· period Dec 31, 2025Document · Index
Jul 30, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 30, 20268-KResults of operations; Regulation FD disclosure· period Jul 30, 2026Document · Index
Apr 8, 2026DEF 14ADefinitive proxy statement· period May 28, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about CASTLE BIOSCIENCES INC, by form type:

4 ×25144 ×11CERT ×18-A12B ×110-Q ×18-K ×1
CSTL recent filings
FiledFormWhat it isOriginal
Oct 21, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 19, 2026Document · Index
Oct 14, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 12, 2026Document · Index
Oct 13, 2026144Notice of proposed sale of securitiesDocument · Index
Oct 7, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 5, 2026Document · Index
Oct 5, 2026144Notice of proposed sale of securitiesDocument · Index
Oct 5, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 1, 2026Document · Index
Oct 1, 2026144Notice of proposed sale of securitiesDocument · Index
Oct 1, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 29, 2026Document · Index
Sep 23, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 21, 2026Document · Index
Sep 16, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 14, 2026Document · Index
Sep 15, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 11, 2026Document · Index
Sep 14, 2026144Notice of proposed sale of securitiesDocument · Index
Sep 11, 2026144Notice of proposed sale of securitiesDocument · Index
Sep 3, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 1, 2026Document · Index
Sep 2, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 31, 2026Document · Index
Sep 1, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 28, 2026Document · Index
Aug 27, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 25, 2026Document · Index
Aug 26, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 24, 2026Document · Index
Aug 25, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 24, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 19, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 17, 2026Document · Index
Aug 18, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 18, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 2026CERTCERTDocument · Index
Aug 14, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 14, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 14, 20268-A12B8-A12BDocument · Index
Aug 6, 20264Statement of changes in beneficial ownership (insider trade)· period Nov 24, 2025Document · Index
Aug 6, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 4, 2026Document · Index
Aug 5, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 3, 2026Document · Index
Aug 4, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 31, 2026Document · Index
Aug 4, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 31, 2026Document · Index
Jul 31, 2026144Notice of proposed sale of securitiesDocument · Index
Jul 31, 2026144Notice of proposed sale of securitiesDocument · Index
Jul 30, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 30, 20268-KResults of operations; Regulation FD disclosure· period Jul 30, 2026Document · Index
Jul 29, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 27, 2026Document · Index
Jul 16, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 14, 2026Document · Index
Jul 6, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 1, 2026Document · Index
Jul 6, 20264Statement of changes in beneficial ownership (insider trade)· period Jul 1, 2026Document · Index

Insider filing activity

87 Form 4 filings appear in CASTLE BIOSCIENCES INC’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

Other companies in Services-Medical Laboratories

All 17 companies in Services-Medical Laboratories· Companies headquartered in Texas

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0001447362 and XBRL company facts. CASTLE BIOSCIENCES INC on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.