Companies House

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.

Companies House publishes 8 APIs on the APIs.io network, including charges API, filingHistory API, insolvency API, and 5 more. Tagged areas include Companies, UK Government, Business Registration, Company Search, and Officers.

The Companies House catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Companies House’s developer surface includes authentication, documentation, engineering blog, pricing, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.8/100 developing ▬ flat Agent 48/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessFreeSelf serve⚡ Free to try

9 APIs

CompaniesUK GovernmentBusiness RegistrationCompany SearchOfficersFiling HistoryInsolvencyChargesPersons of Significant ControlOpen Data

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 50.8/100 · developing

Contract Quality 15.6 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 2.7 / 13

Governance 10.4 / 12

Discoverability 10.0 / 10

Agent readiness — 48/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 15 / 15

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/companies-house: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Companies House Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 127

Standalone JSON Schema definitions for this provider's data models.

Scroll for all 127

Examples 1

Example request and response payloads for these APIs.

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

BlogIndex

BlogIndex

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Forums

Forums

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

BlogRSS

BlogRSS

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: https://raw.githubusercontent.com/api-evangelist/companies-house/refs/heads/main/apis.yml
name: Companies House
description: '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.

  '
type: Index
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/companies-house.png
url: https://raw.githubusercontent.com/api-evangelist/companies-house/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.19'
tags:
- Companies
- UK Government
- Business Registration
- Company Search
- Officers
- Filing History
- Insolvency
- Charges
- Persons of Significant Control
- Open Data
apis:
- name: Companies House Streaming API
  description: '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 company information, filing history, insolvency,
    charges, officers, persons with significant control, disqualified officers, exemptions, and PSC statements. Each account
    is limited to two concurrent streaming connections and requires an API key for authentication.

    '
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developer-specs.company-information.service.gov.uk/streaming-api/guides/overview
  baseURL: https://stream.companieshouse.gov.uk
  tags:
  - Streaming
  - Real-Time
  - Companies
  - Officers
  - Filing History
  properties:
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/streaming-api/guides/overview
  contact:
  - FN: Companies House Developer Forum
    url: https://forum.companieshouse.gov.uk/
- aid: companies-house:companies-house-charges-api
  name: Companies House charges API
  description: Charges
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - charges
  properties:
  - type: OpenAPI
    url: openapi/companies-house-charges-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-filinghistory-api
  name: Companies House filingHistory API
  description: Filing history
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - filingHistory
  properties:
  - type: OpenAPI
    url: openapi/companies-house-filinghistory-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-insolvency-api
  name: Companies House insolvency API
  description: Insolvency
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - insolvency
  properties:
  - type: OpenAPI
    url: openapi/companies-house-insolvency-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-officerdisqualifications-api
  name: Companies House officerDisqualifications API
  description: Officer disqualifications
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - officerDisqualifications
  properties:
  - type: OpenAPI
    url: openapi/companies-house-officerdisqualifications-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-officers-api
  name: Companies House officers API
  description: Officers
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - officers
  properties:
  - type: OpenAPI
    url: openapi/companies-house-officers-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-personswithsignificantcontrol-api
  name: Companies House personsWithSignificantControl API
  description: Persons with significant control
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - personsWithSignificantControl
  properties:
  - type: OpenAPI
    url: openapi/companies-house-personswithsignificantcontrol-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-registeredofficeaddress-api
  name: Companies House registeredOfficeAddress API
  description: Registered office address
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - registeredOfficeAddress
  properties:
  - type: OpenAPI
    url: openapi/companies-house-registeredofficeaddress-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
- aid: companies-house:companies-house-search-api
  name: Companies House search API
  description: Search
  humanURL: https://developer.company-information.service.gov.uk/overview
  baseURL: https://api.company-information.service.gov.uk
  tags:
  - search
  properties:
  - type: OpenAPI
    url: openapi/companies-house-search-api-openapi.yml
  - type: Documentation
    url: https://developer-specs.company-information.service.gov.uk/companies-house-public-data-api/reference
  - type: JSONSchema
    url: json-schema/
  - type: Examples
    url: examples/companies-house-examples.json
common:
- type: AgenticAccess
  url: agentic-access/companies-house-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/companies-house-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/companies-house-domain-security.yml
- type: Authentication
  url: authentication/companies-house-authentication.yml
- type: Website
  url: https://www.gov.uk/government/organisations/companies-house
- type: Documentation
  url: https://developer.company-information.service.gov.uk/overview
- type: GitHubOrg
  url: https://github.com/companieshouse
- type: LinkedIn
  url: https://www.linkedin.com/company/companies-house
- type: Blog
  url: https://companieshouse.blog.gov.uk
- type: Pricing
  url: https://developer.company-information.service.gov.uk/overview
- type: StatusPage
  url: https://forum.companieshouse.gov.uk/c/api-changes/7
- type: X
  url: https://x.com/CompaniesHouse
- type: Forums
  url: https://forum.companieshouse.gov.uk
- type: Authentication
  url: https://developer-specs.company-information.service.gov.uk/guides/authorisation
- type: Plans
  url: plans/companies-house-plans-pricing.yml
- type: RateLimits
  url: rate-limits/companies-house-rate-limits.yml
- type: FinOps
  url: finops/companies-house-finops.yml
- type: Vocabulary
  url: vocabulary/companies-house-vocabulary.yml
- type: JSONLDContext
  url: json-ld/companies-house-context.jsonld
- type: BlogRSS
  url: https://companieshouse.blog.gov.uk/feed/
- type: BlogIndex
  url: blogs/blogs.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Companies House

APIs 9

Pricing Plans 1

Rate Limits 1

FinOps 1

Semantic Vocabularies 1

Spectral Rules 1

JSON Schema 127