# UK Companies House due diligence and KYB (Registrum) (npm · @registrum/mcp)

UK Companies House due diligence: beneficial owners, directors, ECCTA, accounts. Hosted, no key

- Trust score: 91/100 (high trust)
- Change this week: +19
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-06

## Components

- remote · `registrum.co.uk`: 84/100, [markdown](https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/api-mcp.md), [page](https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/api-mcp)
- npm · `@registrum/mcp`: 91/100 (this document), [markdown](https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp.md), [page](https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp)

## Channel facts

- Registry: `npm`
- Package: `@registrum/mcp`
- Version: `2.1.3`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-06.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 3 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to RegistrumUK/uk-companies-house-mcp).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 6 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 3055 tokens (~277/item across 11 items; 11 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 77/100
  - Stability observed for 23 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 11 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 12 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the UK Companies House due diligence and KYB (Registrum) MCP server?

UK Companies House due diligence and KYB (Registrum) runs locally as an npm package, launched with npx -y @registrum/mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add registrumuk-uk-companies-house-mcp -- npx -y @registrum/mcp
```

### Cursor

```json
{
  "mcpServers": {
    "registrumuk-uk-companies-house-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@registrum/mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "registrumuk-uk-companies-house-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@registrum/mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add registrumuk-uk-companies-house-mcp -- npx -y @registrum/mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "registrumuk-uk-companies-house-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@registrum/mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add registrumuk-uk-companies-house-mcp --command npx --arg -y --arg @registrum/mcp
```

### Hermes

```yaml
mcp_servers:
  registrumuk-uk-companies-house-mcp:
    command: "npx"
    args: ["-y", "@registrum/mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "registrumuk-uk-companies-house-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@registrum/mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add registrumuk-uk-companies-house-mcp -t stdio -c npx -a -y @registrum/mcp
```

### Other

```json
{
  "mcpServers": {
    "registrumuk-uk-companies-house-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@registrum/mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-06 (score 91, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-04 (score 90, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 89, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 88, +16)

- [security improvement] Malware scan: unverified → pass
- [functional] Package version: 2.0.15 → 2.1.3

### 2026-10-30 (score 72, −15)

- [security regression] Malware scan: pass → unverified
- [functional] Package version: 2.1.2 → 2.1.3

### 2026-10-29 (score 87, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 85, +1)

- [functional] Package version: 2.0.15 → 2.1.2

## MCP tools (11)

### `search_company` (~81 tokens)

Search for companies

Search for UK companies by name. Returns a list of matching companies with their company number, status, type, and registered address. Use this first when you only have a company name and need its company number.

Input parameters:

- `limit` (integer): Maximum number of results to return (default 20)
- `query` (string, required): Company name or keywords to search for

### `get_company` (~107 tokens)

Get company profile

Get an enriched profile for a UK company by its Companies House number. Returns name, status, type, incorporation date, registered address, SIC codes with descriptions, accounts status, confirmation statement status, and derived fields like company_age_years and accounts.overdue that are not available from the raw Companies House API.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.

### `get_financials` (~361 tokens)

Get company financials

Get structured financial data for a UK company, parsed from its iXBRL accounts filed at Companies House. Returns revenue, cost of sales, gross profit, operating profit, net profit, fixed assets, current assets, total equity, net assets, creditors, and average employees for the current and prior reporting year. Also includes accounts_type (full, abbreviated, micro, dormant or unknown) and a data_quality block indicating which fields were extracted and which were absent. period_end is the end of the accounting period the figures cover (the year the accounts end), NOT the date the accounts were filed; the filing date is data_quality.filed_on. Other data_quality fields: filing_type (Companies House form code: AA, AAMD or AC(NI)), period_end_source and accounts_type_source (how those two values were determined), and accounts_description_code (the verbatim Companies House code, e.g. unaudited-abridged, micro-entity). Unaudited-abridged, small and audit-exemption-subsidiary filings are abbreviated, not full, and carry no profit and loss (check has_profit_loss). accounts_type is unknown when it could not be determined; do not assume full. The response can be available: false with an unavailable_reason: image_pdf (accounts filed as a scanned PDF, common for large companies such as Tesco), no_ixbrl_filings (no digital filing), or dissolved. That means no figures could be extracted; it does not mean the company has no accounts. Cached for 7 days.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.

### `get_directors` (~209 tokens)

Get company officers (directors and secretaries)

Get the current and past officers for a UK company. Despite the tool name, not every entry is a director: the list is the full officer register, so each entry carries an officer_role such as 'director', 'secretary', 'corporate-secretary' or 'llp-member', plus an is_board_director boolean that is false for secretaries. Report each person by their own officer_role - never describe the whole list as directors. Each officer includes name, officer_role, is_board_director, appointment date, resignation date (if applicable), nationality, occupation, month and year of birth, ECCTA verification status, and a list of other companies they are or were appointed to, each with its own officer_role. This gives you a full picture of an officer's corporate history in one call.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.

### `get_compliance` (~205 tokens)

Check ECCTA identity-verification compliance

Check a UK company's ECCTA identity-verification status - who has verified their identity with Companies House, who is still pending, and who is overdue. The Economic Crime and Corporate Transparency Act requires every director and PSC to verify their identity; enforcement begins 18 November 2026, after which unverified officers can block filings. Returns per-company counts (directors_total, directors_verified, directors_pending, directors_overdue) and the same for PSCs, plus unverified_persons with each person's name, role, status and their individual deadline. IMPORTANT: 'pending' means the deadline has not yet passed - it is NOT a failure and must not be reported as one. Only 'overdue' means a deadline was missed. Requires a Pro plan or above. Cached for 24 hours.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.

### `get_psc` (~339 tokens)

Get persons with significant control

Get the PSC (Persons with Significant Control) register for a UK company. Returns individuals, corporate entities, and legal persons who own 25%+ of shares, hold 25%+ of voting rights, or have significant influence or control. Each PSC includes decoded control types in plain English (e.g. 'Owns 25-50% of shares' instead of raw codes). Individual PSCs also carry ECCTA identity verification: verification_status (verified, pending, overdue or unknown), identity_verified, identity_verified_on, and verification_deadline. pending means that person's deadline has not yet passed and is not a compliance failure; unknown means Companies House publishes no record for them, an absence of data rather than a breach. Only overdue means a deadline was missed. Corporate entity PSCs carry none of the verification fields. Their company_number is set only for a confirmed Companies House registration and is otherwise null, so never treat a null as a missing value to look up. What they filed is in registry_number and registry_name, and registry_is_companies_house says how to read it: true is a Companies House registration, null means a number was filed but cannot be tied to the UK register (e.g. a foreign registry), false means no number was filed. kind can be unknown for a PSC type we do not classify, with Companies House's verbatim string in kind_raw. Also detects PSC exemptions for listed PLCs. Cached for 24 hours.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.

### `get_bundle` (~301 tokens)

Get a whole company in one request

Get several views of one UK company in a single request: profile, ECCTA compliance, financials, PSCs and directors. Prefer this over calling get_company, get_compliance, get_financials, get_psc and get_directors separately - it returns the same data for one API call and one credit instead of five, and in a single round trip. Pass include to fetch only the sections you need; omit it to get all five. The profile is always returned. Partial results are normal and are not errors: any section can come back null when it is unavailable for that company or not included in the caller's plan - financials are null for a company that has filed no machine-readable accounts, and compliance requires a Pro plan. Report a null section as 'not available', never as a failed lookup or as an absence of the underlying fact. Only a missing company is an error, and that is a 404. Each section carries exactly what its own endpoint returns, including ECCTA verification_status on individuals, so the pending-versus-overdue rules apply here too.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.
- `include` (array): Sections to fetch. Omit for all five. Valid values: profile, compliance, financials, psc, directors. The profile is always included regardless.

### `get_psc_chain` (~510 tokens)

Resolve PSC ownership chain to find ultimate beneficial owners

Trace the full ownership chain for a UK company by recursively following corporate entity PSCs. Returns a tree showing who ultimately controls the company - natural persons (UBOs), foreign entities, or legal persons - along with why each branch terminated. Each node has a terminal_reason: natural_person, foreign_entity, legal_person, super_secure, unverified_registry, unknown_kind, depth_limit, not_found, cycle_detected, or psc_exempt. Two of those are easy to misread: unverified_registry means a registration number was filed but cannot be tied to the Companies House register (a foreign registry, or one we do not recognise), which is a finding about the ownership structure and not an error or an outage; unknown_kind means Companies House returned a PSC type we do not classify (kind is then unknown), with the raw value in kind_raw. Both are findings, not errors. A corporate node's company_number is set only for a confirmed Companies House registration, otherwise null; the number it filed is in registry_number with registry_name, and registry_is_companies_house is true (Companies House), null (a number was filed but cannot be tied to the UK register) or false (no number filed). ECCTA identity verification: every individual node, at any depth including the ultimate beneficial owners this chain exists to find, carries verification_status (verified, pending, overdue or unknown), identity_verified (true, false for overdue only, or null otherwise), identity_verified_on, and verification_deadline. IMPORTANT: pending means that person's own deadline has not yet passed - it is not a compliance failure and must not be reported as one. A status of unknown means Companies House publishes no record for them, which is an absence of data rather than a breach. Only overdue means a deadline was missed. Corporate, legal-person and super-secure nodes carry none of these fields, so never describe a company itself as having unverified identity. chain_metadata reports how many companies…

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.
- `max_depth` (integer): Maximum chain depth to traverse (1-10, default 5). Each level costs 1 upstream API call per corporate entity found.

### `get_network` (~149 tokens)

Get director network

Map the corporate network connected to a UK company via shared directors. Returns all companies connected through shared board members, up to the specified depth. Each connected company includes its name, number, status, and the directors it shares with the focal company. Useful for identifying corporate group structures, related party relationships, and director interlocks.

Input parameters:

- `company_number` (string, required): Companies House company number, e.g. '00445790' for Tesco PLC. Numeric-only numbers should be zero-padded to 8 digits.
- `depth` (integer): Traversal depth: 1 = direct connections only, 2 = connections of connections (default 1). Depth 2 can return many results for large companies.

### `search` (~102 tokens)

Search companies

Search UK companies at Companies House by name or keywords. Returns an object with a results array; each result has id (company:<number>, pass it to fetch), title (company name, number and status) and url (the company page on registrum.co.uk). Up to 10 results, in relevance order; results is empty when nothing matches. Use fetch on an id to read the company.

Input parameters:

- `query` (string, required): Company name or keywords to search for

### `fetch` (~144 tokens)

Fetch a company

Fetch one UK company by an id from search (company:<number>; a bare company number also works). Returns an object with id, title (company name), url (company page on registrum.co.uk), text (a plain-English summary followed by the full enriched profile as JSON: status, type, incorporation date, registered address, SIC codes, accounts and confirmation statement status) and metadata (company_number, company_status, company_type, source). Profile only; use get_bundle, get_psc, get_directors or get_financials for ownership, officers and accounts.

Input parameters:

- `id` (string, required): Company id from search, e.g. 'company:00445790'

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp#diagnostics

## Score history

- 2026-11-06: 91
- 2026-11-05: 90
- 2026-11-04: 90
- 2026-11-03: 89
- 2026-11-02: 89
- 2026-11-01: 88
- 2026-10-31: 88
- 2026-10-30: 72
- 2026-10-29: 87
- 2026-10-28: 86
- 2026-10-27: 86
- 2026-10-26: 85
- 2026-10-25: 85
- 2026-10-24: 85
- 2026-10-23: 84
- 2026-10-22: 84
- 2026-10-21: 83
- 2026-10-20: 83
- 2026-10-19: 82
- 2026-10-18: 82
- 2026-10-17: 80
- 2026-10-16: 80
- 2026-10-15: 80
- 2026-10-14: 80
- 2026-10-13: 50
- 2026-10-12: 50

## Common questions

### What is the UK Companies House due diligence and KYB (Registrum) MCP server?

UK Companies House due diligence and KYB (Registrum) is an MCP server listed in the public MCP registry as io.github.RegistrumUK/uk-companies-house-mcp. UK Companies House due diligence: beneficial owners, directors, ECCTA, accounts. Hosted, no key. This page covers its npm package (@registrum/mcp).

### Is the UK Companies House due diligence and KYB (Registrum) MCP server safe to use?

UK Companies House due diligence and KYB (Registrum) scores 91 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 6 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the UK Companies House due diligence and KYB (Registrum) MCP server expose?

UK Companies House due diligence and KYB (Registrum) exposes 11 tools: search_company, get_company, get_financials, get_directors, get_compliance, and 6 more. Their descriptions and schemas cost roughly 2,508 tokens of context every time the server is loaded.

### Is the UK Companies House due diligence and KYB (Registrum) MCP server still maintained?

UK Companies House due diligence and KYB (Registrum) is still listed as active in the MCP registry. We last reached this channel on 6 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the UK Companies House due diligence and KYB (Registrum) MCP server under?

UK Companies House due diligence and KYB (Registrum) declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

### What did VerifyMCP test on the UK Companies House due diligence and KYB (Registrum) MCP server?

VerifyMCP ran 16 checks on UK Companies House due diligence and KYB (Registrum), covering Malware scan, Known CVEs, Install scripts, Dependency health and 12 more. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/@registrum/mcp
- Socket report: https://socket.dev/npm/package/@registrum/mcp
- Repository: https://github.com/RegistrumUK/uk-companies-house-mcp
- Changelog RSS feed: https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp.json
- HTML version of this page: https://verifymcp.io/servers/registrumuk-uk-companies-house-mcp/registrum-mcp