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CompanyStack

Official registry Search and web

UK company data: search, officers, owners, shareholders, filed accounts, new companies, KYB checks.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http companystack 'https://api.companystack.co.uk/mcp' --header 'X-Api-Key: <Optional: your CompanyStack API key (starts with cs_). Leave it out to sign in with CompanyStack (OAuth) instead. Create an account free at https://companystack.co.uk/signup?product=api>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "companystack": {
            "type": "http",
            "url": "https://api.companystack.co.uk/mcp",
            "headers": {
                "X-Api-Key": "<Optional: your CompanyStack API key (starts with cs_). Leave it out to sign in with CompanyStack (OAuth) instead. Create an account free at https://companystack.co.uk/signup?product=api>"
            }
        }
    }
}

Frequently asked questions

What is CompanyStack?

UK company data: search, officers, owners, shareholders, filed accounts, new companies, KYB checks.

How do I install CompanyStack?

It runs as a remote server. In Claude Code: claude mcp add --transport http companystack 'https://api.companystack.co.uk/mcp' --header 'X-Api-Key: <Optional: your CompanyStack API key (starts with cs_). Leave it out to sign in with CompanyStack (OAuth) instead. Create an account free at https://companystack.co.uk/signup?product=api>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does CompanyStack need an API key?

Yes. It expects X-Api-Key, which you set in its configuration.

Who maintains CompanyStack?

It is published by uk.co.companystack. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.