Companies House API

by developer.company-information.service.gov.uk

Companies Added on November 7th, 2026 Checked and working on November 7th, 2026

Visit developer.company-information.service.gov.uk →

What it does

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
HTTP-GET
JSON
REST

At a glance

API key: Needed, free · More APIs with a free key
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

More information: https://developer.company-information.service.gov.uk/

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HTML

<a href="https://free-web-services.com/web-services/open-data/companies/companies-house-api.html"><img src="https://free-web-services.com/badge.svg" width="208" height="44" alt="Listed on Free Web Services" /></a>

Markdown

[![Listed on Free Web Services](https://free-web-services.com/badge.svg)](https://free-web-services.com/web-services/open-data/companies/companies-house-api.html)

Companies House API — developer.company-information.service.gov.uk

Example request

curl

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

JavaScript

const response = await fetch("https://api.company-information.service.gov.uk/search/companies?q=tesco", {
  headers: {
    "Authorization": "Basic YOUR_BASE64_API_KEY",
  },
});
const data = await response.json();
console.log(data);

Python

import requests

response = requests.get(
    "https://api.company-information.service.gov.uk/search/companies?q=tesco",
    headers={
        "Authorization": "Basic YOUR_BASE64_API_KEY",
    },
    timeout=30,
)
print(response.json())

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.