UK Companies House API: access card
What is the UK company register API?
UK Companies House API is the official UK company register: profiles, filing history, directors, and beneficial owners, published by Companies House (UK government). Coverage: United Kingdom; scale: 5,000,000+ companies, according to Companies House statistics, according to the catalog manifest. In our data — the Aidenix Atlas catalog of verified sources — this endpoint was last probed on 2026-07-24 and returned HTTP 200. What the card gives you:
- The exact endpoint and a working request you can copy.
- Authentication and rate limits: free API key as basic-auth username.
- The query keys the source accepts and the fields it returns, verified against the live endpoint.
How do you query it?
A working query is one plain HTTP GET — in our data this exact request form was verified on 2026-07-24:
curl -u "YOUR_API_KEY:" "https://api.company-information.service.gov.uk/company/{number}/persons-with-significant-control"
The catalog recipe records these endpoints, all verified:
/company/{number}— company profile./company/{number}/officers— directors and secretaries./company/{number}/persons-with-significant-control— beneficial owners above 25%.
What does it accept and return?
The interface contract is a short one: 2 query facets in, 4 field groups out. The table is generated from the catalog manifest, according to the probe of 2026-07-24 — every row below was checked against the live endpoint, not copied from vendor marketing:
| Facet | Value |
|---|---|
| Endpoint | https://api.company-information.service.gov.uk/company/{company_number} |
| Auth | free API key as basic-auth username, blank password; limit 600 requests per 5 minutes |
| Query by | company number, OE number (Register of Overseas Entities) |
| Returns | company profile, officers, beneficial owners (PSC >25%), registered office address |
| Provider | Companies House (UK government) |
| Coverage | United Kingdom |
| Last probe | 2026-07-24 — HTTP 200 |
Related sources
A related source is a dataset that joins to the UK company register API through shared keys, according to the join map of our catalog. In our data, each of the 3 cards below was probed on 2026-07-24 and is live:
- GLEIF LEI records API — Global.
- New York Active Corporations dataset — United States — New York.
- SEC EDGAR submissions API — United States (federal).
The workflow this source belongs to is covered in the full guide: UK Companies House API — free company registry data guide.
Source card generated from the Aidenix Atlas catalog; facts as probed on 2026-07-24.
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