Company · CSTL · CIK 1447362

Castle Biosciences Inc (CSTL) SEC filings and CIK.

CSTL’s SEC Central Index Key (CIK) is 0001447362, or 1447362 without leading zeros. The SEC’s ticker file lists it as CASTLE BIOSCIENCES INC.

Ticker: CSTL
CIK: 0001447362
Other tickers: None
Insider transactions, Q3 2026: 106

Insider trading

In Q3 2026, insiders at Castle Biosciences Inc reported 106 non-derivative transactions on 20 Forms 3, 4 and 5, including 0 open-market purchases and 94 sales. See every CSTL insider transaction →

Recent filings we observed

No filings for this CIK appear in our current observation window. The full history is available from the filings endpoint below and on SEC.gov.

Get CSTL SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=1447362&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/1447362" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/1447362?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · Castle Biosciences Inc on SEC.gov

Questions

What is CSTL’s CIK number?

CSTL’s SEC Central Index Key (CIK) is 0001447362, or 1447362 without leading zeros. The SEC’s ticker file lists it as CASTLE BIOSCIENCES INC.

How do I find Castle Biosciences Inc’s 10-K?

Request /api/v1/filings?cik=1447362&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/cstl.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.