# Companies House API

Category: [Companies](https://free-web-services.com/web-services/open-data/companies/)  
Page: https://free-web-services.com/web-services/open-data/companies/companies-house-api.html  
Documentation: https://developer.company-information.service.gov.uk/

The Companies House API gives the UK register of companies: search companies, and get their profile, registered address, officers, persons with significant control, charges and filing history, for example to check a supplier. Responses are JSON. Free with a free API key, up to 600 requests per five minutes.

- API key: Needed, free
- Pricing: Free with a free API key, up to 600 requests per five minutes.
- From the browser: Yes (CORS)
- Formats: JSON
- Interface: REST, HTTP-GET
- Provider: developer.company-information.service.gov.uk
- Last checked: Working on November 7th, 2026

Example request:

```sh
curl 'https://api.company-information.service.gov.uk/search/companies?q=tesco' \
  -H 'Authorization: Basic YOUR_BASE64_API_KEY'
```

Replace YOUR_BASE64_API_KEY with your own values from your account. The JavaScript works in a web page as well as in Node.js 18 or newer.