Companies House MCP server

Companies House CLI and MCP

Read the UK Companies House public register from your terminal, your scripts, or an AI assistant. Search companies, read their records, trace ownership, pull filings and download the filed documents themselves.

Everything runs on your own free API key. No hosted backend, no shared key, no proxy — requests go from your machine straight to Companies House.

Documentation: companies-house.uk

Pick your route

In an AI assistant — Claude Code, Claude Desktop, Codex, Cursor, Zed:

npx -y companies-house-mcp

Set COMPANIESHOUSEAPI_KEY in the client's config. Full setup for each client: companies-house.uk/mcp.

In the terminal — the ch command:

npm install -g companies-house-cli
ch config set-key your-key-here
ch report 00445790

Full reference: companies-house.uk/cli.

On your own server — an optional Cloudflare Worker you deploy into your own account, so Claude Code can reach it remotely. See companies-house.uk/self-hosting, or the deployment guide.

Get a free API key at developer.company-information.service.gov.uk. It takes about a minute.

What you can do

Find a company — searchcompanies / ch search by name, with filters for status, type, incorporation date, location and SIC code. searchofficers / ch search-officers finds people across the whole register.

Read its record — getcompanyprofile / ch profile for status, addresses, SIC codes and filing dates. getcharges, getinsolvency, getcompanyregisters, getexemptions and getuk_establishments for the rest.

Trace people and ownership — getofficers / ch officers for who is in post, getappointments and officernetwork for everywhere one person is appointed, getownership / ch ownership for persons with significant control, and getofficerdisqualifications for the disqualified directors register.

Read the filings — getfilings / ch filings for the filing history, getfilingdocument for one filing in detail, and downloadfiling_document / ch document for the filed PDF itself.

Get the whole picture at once — companyreport / ch report reads the main records in a single call. duediligence_check / ch check screens a company against the register and reports the entries a reviewer would want to look at.

Full parameter reference: companies-house.uk/tools.

What this is not

Companies House records what companies file. It carries out basic completeness checks but does not verify that the information is accurate.

So nothing here is a verification, a credit check, a sanctions or politically-exposed-person screening, or a clearance decision. duediligencecheck is a screening summary: it tells you what is on the register and what it could not check. It never concludes that a company is sound. An absence of adverse entries means nothing adverse has been filed.

Shortened. The full README is on GitHub.