# Free Company Register APIs

Page: https://free-web-services.com/web-services/open-data/companies/

Company APIs give official company registers and identifiers: UK companies and their officers, the global LEI register and the filings of US-listed companies. Use them to check a business partner or show a company's financial results.

## Services

| Service | API key | Formats | Free use |
|---|---|---|---|
| [Companies House API](https://free-web-services.com/web-services/open-data/companies/companies-house-api.md) | Needed, free | JSON | Free with a free API key, up to 600 requests per five minutes. |
| [GLEIF LEI API](https://free-web-services.com/web-services/open-data/companies/gleif-lei-api.md) | Not needed | JSON | Free, no key needed. |
| [SEC EDGAR APIs](https://free-web-services.com/web-services/open-data/companies/sec-edgar-apis.md) | Not needed | JSON | Free, no key needed. |

## Questions

**Which free company register APIs work without an API key?**  
GLEIF LEI API and SEC EDGAR APIs work without a key, according to their documentation. Most keyless services ask you to keep the number of requests reasonable, and some ask for a User-Agent that names your app.

**Are these company register APIs really free?**  
The services here can be used without paying, at least on a free plan or free tier, often with limits such as a number of requests per day or non-commercial use only. The table above quotes what each service says about its free use; check the provider's own terms before you rely on it.

**How up to date is this list?**  
The address of every service is checked about once a week, and services that stop working or stop being free are removed. This list last changed on November 8th, 2026.