Company Information Service UK Companies House Public Data API

Name: UK Companies House Public Data API
Brand: UK Companies House Public Data API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentData EnrichmentCompany DataapiKey27 EndpointsREST

For Agents

Install Jentic One Beta

Connect the UK Companies House Public Data API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the UK Companies House Public Data API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with UK Companies House Public Data API.

Search companies, officers, and disqualified officers via /search/* endpoints

Run advanced and alphabetical company searches with filters

Fetch a full company profile by company number via GET /company/{companyNumber}

GET STARTED

Start building with UK Companies House Public Data API

Explore with Jentic

View OpenAPI Document

Jentic publishes the only available OpenAPI specification for the UK Companies House Public Data API, keeping it validated and agent-ready. Companies House is the UK government registrar of companies; the API exposes read-only access to every UK-registered company's profile, officers, filing history, charges, insolvency status, persons with significant control (PSC), exemptions, and disqualified-officer records. Use it for KYC, supplier due diligence, beneficial-ownership analysis, and AI agents that answer 'who owns this company?' or 'when did they file last?'.

Use Cases

Patterns agents use UK Companies House Public Data API for, with concrete tasks.

★ KYC and Supplier Due Diligence

Verify a UK supplier by calling GET /company/{companyNumber} for the profile, GET /company/{company_number}/officers for current directors, and GET /company/{company_number}/persons-with-significant-control for ownership. Combined, these answer 'is this company real, who runs it, and who owns it?' — the core questions of supplier onboarding and AML checks.

Given company number 12345678, fetch the profile, list of officers, and PSC list, and return a one-paragraph summary

Beneficial Ownership Analysis

Walk the persons-with-significant-control endpoints to map ownership structures across multiple companies. The /persons-with-significant-control/corporate-entity/{psc_id} variant lets analysts trace corporate parents up the chain, while /persons-with-significant-control-statements surfaces statements where PSC information is restricted or missing.

List PSCs for a company and follow corporate-entity PSCs up to two levels of parent companies

Filing Watchlist for Investors

Subscribe to a portfolio's filing activity by polling GET /company/{company_number}/filing-history per holding. Surface new filings (annual accounts, confirmation statements, charge registrations) into an investor dashboard so analysts see material updates without manually checking each company page.

Fetch the latest 20 filings for company number 12345678 and flag any of category 'insolvency' or 'mortgage'

AI Agent Company Lookup via Jentic

An AI agent connected to Jentic can answer 'who's on the board of [company]?' by searching for the right Companies House operation and executing it. Jentic stores the API key in the MAXsystem vault and uses Basic auth (key as username, blank password) so the agent never sees the raw key.

Use Jentic to search 'look up a uk company on companies house', load GET /company/{companyNumber}, and execute for company number 12345678

Key Endpoints

27 endpoints — jentic publishes the only available openapi specification for the uk companies house public data api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/search/companies

Search companies

GET

/company/{companyNumber}

Get a company profile

GET

/company/{company_number}/officers

List company officers

GET

/company/{company_number}/filing-history

List filing history

GET

/company/{company_number}/persons-with-significant-control

List persons with significant control

GET

/company/{company_number}/charges

List company charges

GET

/officers/{officer_id}/appointments

List officer appointments

GET

/disqualified-officers/natural/{officer_id}

Get a disqualified natural officer

GET

/search/companies

Search companies

GET

/company/{companyNumber}

Get a company profile

GET

/company/{company_number}/officers

List company officers

GET

/company/{company_number}/filing-history

List filing history

GET

/company/{company_number}/persons-with-significant-control

List persons with significant control

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

The Companies House API key is stored encrypted in the Jentic vault (MAXsystem) and injected as Basic auth (key as username, blank password) at request time. The raw key never enters the agent's context window or logs.

Intent-based discovery

Agents search Jentic by intent (e.g., 'look up a uk company on companies house') and Jentic returns the matching operation with its full input schema, so the agent calls the right endpoint without browsing Companies House documentation.

Time to first call

Direct Companies House integration: half a day to handle Basic auth (with the empty-password quirk), pagination, and rate limits. Through Jentic: under 30 minutes — search, load, execute.

FAQs

Specific to using UK Companies House Public Data API through Jentic.

Why is there no official OpenAPI spec for the UK Companies House API?

Companies House publishes human documentation at developer.company-information.service.gov.uk but does not publish a machine-readable OpenAPI specification. Jentic generates and maintains this spec so AI agents and developers can call it via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Companies House API use?

Companies House uses HTTP Basic authentication, with the API key as the username and an empty password. The header looks like Authorization: Basic <base64(key:)>. Through Jentic the key is stored encrypted in the MAXsystem vault and never enters the agent's context.

Can I search companies by name with the Companies House API?

Yes. GET /search/companies accepts a query string and returns matching companies. GET /advanced-search/companies adds richer filters (incorporated date range, SIC code, status), and GET /alphabetical-search/companies orders results alphabetically.

How do I list persons with significant control for a company?

GET /company/{company_number}/persons-with-significant-control lists current PSC entries. The variants /persons-with-significant-control/individual/{psc_id}, /corporate-entity/{psc_id}, and /legal-person/{psc_id} return the typed detail per PSC kind. Use /persons-with-significant-control-statements for restricted or missing PSC statements.

What are the rate limits for the Companies House API?

Companies House enforces a rate limit of 600 requests per IP per 5-minute window. Exceeding this returns 429. For sustained workloads, batch lookups by company number rather than re-searching, and cache profile data which changes infrequently.

How do I look up a UK company through Jentic?

Search Jentic for 'look up a uk company on companies house', load the schema for GET /company/{companyNumber}, and execute with the target company number. The Jentic Python SDK pattern is await client.search(...), await client.load(...), await client.execute(...).