# Companies House

**Canonical:** https://apis.io/providers/companies-house/  
**Website:** https://www.gov.uk/government/organisations/companies-house  
**APIs profiled:** 9

Companies House is the UK government executive agency and trading fund responsible for incorporating and dissolving limited companies and registering company information in Great Britain. The Companies House REST API provides a free, open, and standardised way to search and retrieve company registration data, including company profiles, officer appointments, persons of significant control, filing history, charges, and insolvency records. Developers can also access a real-time Streaming API that delivers changes to Companies House data as they happen, enabling applications to stay up-to-date without polling. Authentication is handled via API key using HTTP Basic Auth, and all access is provided free of charge with a generous rate limit.

## Kin Score — 47.8 / 100 (developing)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 47.8).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 60.5 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 42.1 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

Regulatory layer — **Government & Public Sector**: 42.6 (matched via tags).

## Agent readiness — 42.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | na |
| Error Semantics | verified |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (9)

- **Companies House Streaming API** — The Companies House Streaming API delivers real-time changes to Companies House data via long-running HTTP connections. It streams updates across nine data categories including ...
- **Companies House charges API** — Charges
- **Companies House filingHistory API** — Filing history
- **Companies House insolvency API** — Insolvency
- **Companies House officerDisqualifications API** — Officer disqualifications
- **Companies House officers API** — Officers
- **Companies House personsWithSignificantControl API** — Persons with significant control
- **Companies House registeredOfficeAddress API** — Registered office address
- **Companies House search API** — Search

## Agentic access (1)

- **Companies House Agentic Access** — 28 operations

## Security (3)

- **Companies House Authentication** — apiKey · 1 scheme
- **Companies House Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Companies House Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Companies House Plans Pricing**

## Tags

Companies, UK Government, Business Registration, Company Search, Officers, Filing History, Insolvency, Charges, Persons of Significant Control, Open Data

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/companies-house/). Scores are computed from the provider's own public artifacts under a published rubric.