Registrum

Registrum is a Model Context Protocol endpoint that provides UK company data from Companies House in JSON format.

Registrum serves a Model Context Protocol endpoint that answers with live Companies House data. It provides company search, officers, filing and verification state, parsed accounts, and ownership traced through corporate shareholders to the people who hold control. Users add the endpoint to their client configuration and ask questions about UK companies directly. The server is open source on GitHub and requires no installation or API key for the free tier. Anonymous callers share an upstream Companies House budget, and users can obtain a free key to raise usage caps.

Registrum at a glance

Best for: Software engineer, Founder, Researcher
Runs on: Web, API
Pricing: Free keyless tier with metered upstream cost; free API key available to raise caps
Released: October 2026
Category: AI research tool
Website: registrum.co.uk

Key features

Search UK companies
View company officers
Check filing and verification state
Access parsed accounts and financials
Trace ownership chains to people with control
Connect via Model Context Protocol endpoint

Use it for

Query company ownership chains
Check filing currency and compliance
Inspect company turnover and net assets
Investigate director networks across companies

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