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  1. Fonteum
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  3. Glossary
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  5. Companies House
Fonteum Data GlossaryData Standards

What is Companies House?

Companies House is the United Kingdom public company register, run by an executive agency of the UK Department for Business and Trade. It publishes company numbers, names, status, registered-office fields, incorporation dates, SIC codes, filings, and other public company facts through search, API, and monthly bulk data.

Short explanation

Companies House is the official UK company-register authority and the source behind Fonteum's `uk-companies-house` family. Fonteum uses the Free Company Data Product as the bulk spine, keyed by company number, and treats changing names, offices, SIC codes, filing dates, and status fields as dated register facts. The source is licensed under the Open Government Licence v3.0 and is distinct from a tax identifier, credit file, or private due-diligence report.

Related platform: Source library

Last updated: 2026-07-11Reviewed by: Fonteum data standards desk — Source-provenance editorial review. Definitions checked against primary federal sources.

How it’s used

  • UK company profiles: the company number is the source key for names, company status, incorporation date, registered office, and SIC fields.
  • Bulk company-register ingestion: Fonteum's `uk-companies-house` adapter reads the monthly Free Company Data Product and stores the source date and OGL attribution.
  • Cross-border entity resolution: Companies House records can be read beside LEI, UEI, ABN, ACN, SIREN, and NZBN records without treating names as enough evidence by themselves.

Frequently asked questions

Who runs Companies House?
Companies House is an executive agency of the UK Department for Business and Trade.
What identifier anchors a Companies House record?
The company number anchors the public register record and stays with the registered body even when its name changes.
What Companies House data does Fonteum ingest?
Fonteum ingests the public Free Company Data Product as the `uk-companies-house` source family and stores company-level register facts with source and license attribution.

Related terms

  • UK Company Number
  • Company Register Bulk Data
  • LEI
  • SIC Code
  • Entity Resolution
  • Provenance

Explore in Fonteum

How Fonteum sources, resolves, and publishes data tied to this term.

  • PlatformSource library
  • PlatformGlobal company register pages
  • PlatformEntity graph

Authoritative sources

  • Companies House: search the register↗
  • Companies House: Free Company Data Product↗
  • Open Government Licence v3.0↗
← All glossary terms

What’s on file, by the numbers

Platform snapshot · 2026-07-15

13.4Mproviders & companiesProviders, organizations, owners, and facilities on file
26.2Msource-linked factsSource-linked field facts in the dated platform snapshot
—sources liveCrosswalk-resolved sources with a proved content transition in the preceding 45 days
111sources integratedActive registry rows; integration does not establish a load
13state Medicaid jurisdictionsDistinct states represented in the state-exclusions serving table

Built on the authoritative federal record

The primary sources, named on every page.

These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.

  • CMS
  • HHS-OIG
  • HRSA
  • FDA
  • NLM
  • NUCC
  • Census
  • BLS
  • BEA

See the full source registry, with license and refresh cadence for each →

Reproducible by design

Published figures name their source and date.

Source and date

Published research identifies its government file and observation date. Source-file SHA-256 coverage is disclosed separately; facts do not currently link deterministically to signatures.

Reproducible SQL

Each study ships the exact query behind its figures, run against the same dated copy of the federal file we used. Re-run it yourself.

Daily observations

The platform records table row counts daily. Those observations detect local drift; they do not imply that an upstream publisher released or Fonteum ingested new data that day.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

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Trust & legal
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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

© 2026 Fonteum LLC. All rights reserved.

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A public-records graph that exposes source and observation metadata where supplied.

Fonteum's provenance ledger contained 26.2M source-linked facts on July 12, 2026. All but 14 carried a source-file SHA-256; 0 linked deterministically to a signature. Inspect a supplied snapshot id at fonteum.com/verify · source-mark coverage and limitations.
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