United Kingdom Business Registry (Companies House UK) & Open Business Companies Data: 8-character Company Registration Number (CRN), Official Portals & Master Data

What You Need to Know at a Glance: United Kingdom Business Registry & Company Master Data (Companies House UK)

The statutory backbone for company register search in United Kingdom is Companies House (UK Registrar of Companies — Find and Update Company Information & API), keyed by each organization’s 8-character Company Registration Number (CRN). Around that core register, United Kingdom’s institutional data landscape comprises 11 verified official sources managed by official company register, official company register API documentation, official company register bulk-download service, official company register search. Primary legal-entity lookup routes include Companies House search (official company register) and Companies House advanced search (official company register search).

To supplement statutory registration records from Companies House UK, official verification workflows in United Kingdom draw upon fiscal and taxpayer registration via GOV.UK Tax ID number check (official tax-identifier lookup guidance); open data catalogues and statistical business frames through Companies House developer API (official company register API documentation) and Companies House bulk downloads (official company register bulk-download service); financial supervision, capital-market disclosures, and LEI records from Charity Commission register (official charity regulator register) and United Kingdom LEI records via GLEIF (GLEIF global LEI system); public procurement notices, official gazettes, and intellectual-property registers such as Find a Tender (official UK procurement notice service) and Contracts Finder (official UK public contracts service).

How the Official United Kingdom Business Registry (Companies House UK) & Public Data Ecosystem Work

Company-register coverage: Companies House is the central authority for incorporated company records. Company number, registered name, status, filing history and registered-office context are core research fields. Check the applicable conditions of documents and person-linked fields before reusing them.

API and bulk access: the developer API and bulk-download service make the UK commercially useful for data operations. API access is best for targeted lookups and workflow automation. Bulk downloads are best for population-scale reconciliation and periodic refresh. Both still need source terms, update dates, field dictionaries, authentication/rate notes and error-handling records.

Procurement and public notices: Find a Tender and Contracts Finder add supplier and buyer events. The Gazette adds statutory notice context, especially for insolvency and formal public notices. These are event layers. They are useful for risk, procurement intelligence and public-sector sales research, but they should be matched back to the Companies House core with confidence scores.

Charity, tax, IP and LEI context: Charity Commission records identify charity entities in England and Wales. GOV.UK Tax ID checks can support tax-identifier validation where the service terms and use case allow it. UK IPO trademark routes add brand/IP context. GLEIF adds standardized LEI records for entities that have LEIs. None of those layers is complete UK business coverage.

Update risk: UK company records, filings, procurement notices, Gazette notices, charity records, Tax ID checks, trademark records and LEI records update on different schedules. A reliable dataset needs per-source access dates, observed update dates, source owner, field scope and data-retention policy rather than one generic last-updated timestamp.

Official United Kingdom Business Registry, Company Data API & Master Data Portals (11 Verified Sources)

Core Corporate Registry, Entity Lookup & Statutory Filings

Companies House search — official company register

Data & Access: registry — public web search

Terms & Operational Scope: Companies House terms and Crown/open-government licensing conditions apply by dataset/field. Companies House is the core official UK company-register source. Do not infer marketing-contact permission or beneficial-owner reuse from company filings.

Companies House advanced search — official company register search

Data & Access: registry — public advanced web search

Terms & Operational Scope: Companies House service terms apply. Advanced search supports manual discovery across company status and attributes. Do not treat UI search as a bulk-reuse endpoint.

The Gazette — official public record / insolvency notices

Data & Access: gazette_insolvency — public notice search

Terms & Operational Scope: Gazette terms apply; use notices as evidence with context. The Gazette is a high-quality official notice layer for insolvency and statutory events. Do not treat notice data as a complete live trading-status source.

Tax Authority, Fiscal Registration & Customs Identifiers

GOV.UK Tax ID number check — official tax-identifier lookup guidance

Data & Access: tax_identifier — public guidance and lookup route

Terms & Operational Scope: GOV.UK/HMRC service terms apply. Tax ID lookup can be a practical identifier-validation supplement. Do not claim Tax ID data is a company-register substitute or full business directory.

National Open Data Portals, Bulk Feeds & Statistical Agencies

Companies House developer API — official company register API documentation

Data & Access: api — API documentation, API key/authentication

Terms & Operational Scope: Companies House API terms and source-field limits apply. Companies House provides official API access for company-profile and filing workflows. Do not claim unlimited API use or private-contact coverage.

Companies House bulk downloads — official company register bulk-download service

Data & Access: bulk_open_data — bulk download

Terms & Operational Scope: Companies House/Crown licensing and dataset notices apply. The UK has official Companies House bulk data options for core company records. Do not imply every filing/document field is free bulk data.

Central Bank, Financial Supervision, Capital Markets & LEI

Charity Commission register — official charity regulator register

Data & Access: regulator — public web register

Terms & Operational Scope: regulator-publication terms; charity/officer data needs privacy-aware reuse. The Charity Commission register is the official charity-entity layer for England and Wales. Do not treat trustees/person fields as marketing contacts.

United Kingdom LEI records via GLEIF — GLEIF global LEI system

Data & Access: lei — public API

Terms & Operational Scope: GLEIF open data licence/API terms apply. GLEIF is a high-quality enrichment layer for UK entities that have LEIs. Do not claim LEI coverage is comprehensive for all businesses.

Public Procurement & Intellectual Property Registers

Find a Tender — official UK procurement notice service

Data & Access: procurement — public notice search

Terms & Operational Scope: public notice terms/open-government conditions apply. Find a Tender is an official procurement layer for UK supplier and buyer context. Do not describe procurement notices as a company register.

Contracts Finder — official UK public contracts service

Data & Access: procurement — public web search

Terms & Operational Scope: public notice/open-government terms apply. Contracts Finder is useful for UK public-sector sales and supplier enrichment. Do not infer complete private-sector coverage.

UK IPO trademark search — official IP office route

Data & Access: ip — public web search guidance

Terms & Operational Scope: UK IPO/GOV.UK terms apply. UK trademark search can enrich company records with brand/IP context. Do not treat trademarks as proof of company registration or activity.

Complete Comparison Matrix: United Kingdom Business Registry (Companies House UK), Company Master Data & Open Data APIs

Official Source	Issuing Authority	Access & Data Provided	Reuse & Licensing	Operational Scope & Boundaries
Companies House search	official company register	registry — public web search	Companies House terms and Crown/open-government licensing conditions apply by dataset/field	Companies House is the core official UK company-register source. Do not infer marketing-contact permission or beneficial-owner reuse from company filings.
Companies House developer API	official company register API documentation	api — API documentation, API key/authentication	Companies House API terms and source-field limits apply	Companies House provides official API access for company-profile and filing workflows. Do not claim unlimited API use or private-contact coverage.
Companies House bulk downloads	official company register bulk-download service	bulk_open_data — bulk download	Companies House/Crown licensing and dataset notices apply	The UK has official Companies House bulk data options for core company records. Do not imply every filing/document field is free bulk data.
Companies House advanced search	official company register search	registry — public advanced web search	Companies House service terms apply	Advanced search supports manual discovery across company status and attributes. Do not treat UI search as a bulk-reuse endpoint.
Find a Tender	official UK procurement notice service	procurement — public notice search	public notice terms/open-government conditions apply	Find a Tender is an official procurement layer for UK supplier and buyer context. Do not describe procurement notices as a company register.
Contracts Finder	official UK public contracts service	procurement — public web search	public notice/open-government terms apply	Contracts Finder is useful for UK public-sector sales and supplier enrichment. Do not infer complete private-sector coverage.
The Gazette	official public record / insolvency notices	gazette_insolvency — public notice search	Gazette terms apply; use notices as evidence with context	The Gazette is a high-quality official notice layer for insolvency and statutory events. Do not treat notice data as a complete live trading-status source.
Charity Commission register	official charity regulator register	regulator — public web register	regulator-publication terms; charity/officer data needs privacy-aware reuse	The Charity Commission register is the official charity-entity layer for England and Wales. Do not treat trustees/person fields as marketing contacts.
UK IPO trademark search	official IP office route	ip — public web search guidance	UK IPO/GOV.UK terms apply	UK trademark search can enrich company records with brand/IP context. Do not treat trademarks as proof of company registration or activity.
GOV.UK Tax ID number check	official tax-identifier lookup guidance	tax_identifier — public guidance and lookup route	GOV.UK/HMRC service terms apply	Tax ID lookup can be a practical identifier-validation supplement. Do not claim Tax ID data is a company-register substitute or full business directory.
United Kingdom LEI records via GLEIF	GLEIF global LEI system	lei — public API	GLEIF open data licence/API terms apply	GLEIF is a high-quality enrichment layer for UK entities that have LEIs. Do not claim LEI coverage is comprehensive for all businesses.

Operational Scope, Access Workflows & What Is Missing from Public United Kingdom Registry Records

The free monthly basic-company-data product is a snapshot of live companies. Document the snapshot month and fields; it is not a contact list or a statement of current trading activity. See Companies House data products for the source owner’s current documentation. Source types and evaluation criteria are described here; check the conditions of the specific service or product when using it.

The United Kingdom is one of the best jurisdictions for official company data because Companies House provides public search, API documentation and bulk-download routes. That strength can also create false confidence. A serious UK company-data workflow still needs to separate the company-register core from procurement notices, Gazette events, charity records, Tax ID checks, trademark context, LEI records and regulated financial-services data. Those layers answer different questions and carry different reuse, privacy and update risks.

This guide explains how to combine Companies House identifiers with procurement, notices and specialist registers. It separates company records, filings, contact information and sector-specific coverage, and provides a method for checking provenance and update dates.

Start with Companies House search, API and bulk data for company identity. Add procurement, statutory notices, charity, tax, IP or LEI sources only when they answer a defined question. Each supplementary source has its own scope and conditions; none establishes contact permission.

Manual verification: use Companies House search and advanced search to validate company number, registered name, status and filing context. Manual routes are best for data validation checks and edge cases. They should not be documented as bulk extraction methods.

API workflows: use the Companies House developer API for repeatable lookup, profile and filing-history workflows. Store endpoint, authentication note, query parameter, response field, source timestamp and transformation logic. If a workflow exposes officer or PSC data, keep privacy and lawful-use flags with those fields.

• Best official backbone: Companies House search, developer API and bulk downloads provide the core company-register evidence.
• Best enrichment layers: Find a Tender, Contracts Finder, The Gazette, Charity Commission, UK IPO, GOV.UK Tax ID checks and GLEIF add context but are not complete company registers.
• Main reuse boundary: company filings, officer fields, persons with significant control, dissolved-history details, paid documents and contact data need field-level caution.
• Marketing-contact caution: public company visibility is not permission to build email, phone or lead-list exports.
• Coverage boundary: registered companies, charities, regulated firms and trading businesses are different populations. State which population a source or dataset covers.
• Company core: company number, registered name, jurisdiction, company type, status, incorporation date, registered-office country and source provenance.
• Filing layer: filing type, filing date, document availability, source route, paid/free flag and document-level reuse note.
• People-control layer: officer, trustee or PSC fields stored separately with privacy category, suppression flag, lawful-use note and source date.

Frequently Asked Questions: United Kingdom Business Registry (Companies House UK) & Company Data

What is the best official source for UK company data?

Companies House is the core official company-register source. Use search for manual validation, the developer API for workflow integration and bulk downloads for population-scale reconciliation.

Does the UK provide API and bulk company data?

Yes. Companies House provides API documentation and bulk-data products for defined company information. Different products have different fields and dates; their availability does not establish unrestricted reuse of every document, officer/PSC field or contact record.

Can Companies House data be used for marketing contact lists?

No. Public company filings are not consent for private email, phone, lead-list or sales-prospecting contact enrichment. Contact-data workflows require separate sourcing, compliance and suppression controls.

Should The Gazette be treated as a company register?

No. The Gazette is an official public-notice layer. It is useful for insolvency and statutory events, but it does not replace the live company-register core.

How should procurement data be used?

Find a Tender and Contracts Finder should be stored as event layers and matched back to company identifiers. They are valuable for supplier intelligence and public-sector sales research, not complete business population data.

Are charity records part of ordinary company data?

They are a specialist entity layer. Charity Commission records are useful for charity validation, but trustee/person fields require privacy-aware handling.

What does the FCA register cover?

It covers regulated financial-services firms and related records within the FCA’s remit. Check the official service for the scope and status of a specific record; do not generalise the results to all UK companies.

How should a commercial dataset be evaluated?

Before choosing a supplier, inspect a sample and the exact edition specification. Compare provenance, field definitions, duplicate handling, update dates and applicable use conditions against the intended task.

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