Get the PSC (Persons with Significant Control) register for a company.

Returns all active and ceased PSCs, split into categories. kind is a closed enum decided by an explicit allow-list of every Companies House PSC kind:

• individual - a natural person with significant control
• corporate-entity - a company with significant control
• legal-person - a legal person (e.g., government body) with significant control
• super-secure - a person whose details are protected by court order
• unknown - Companies House returned a kind we have not classified. Nothing is inferred from it: no verification status, no chain traversal.

Every PSC also carries kind_raw - the verbatim Companies House kind string (e.g. individual-beneficial-owner). Before 2026-08-01 an unrecognised kind was echoed into kind itself; it is now normalised to unknown and the original value is always available in kind_raw.

Corporate-entity PSCs - which register the number belongs to. Companies House stores a corporate PSC's number as the entity's number at whatever registry identification.place_registered names, which is often not Companies House (Guernsey Registry, Jersey Financial Services Commission, Commercial Register Of Liechtenstein, ...). Four fields make this explicit:

• registry_number - the number exactly as filed, at whatever registry issued it
• registry_name - that registry's name as filed
• registry_is_companies_house - true (confirmed UK register), null (a number is present but cannot be tied to the UK register), false (no registration number filed at all)
• company_number - populated only when registry_is_companies_house is true, and always in canonical Companies House form (zero-padded, upper-cased), so it can be passed straight back to this API

Before 2026-08-01 company_number carried the raw filed value whatever register it came from, so a foreign number could zero-pad onto an unrelated UK company (CH-Api#59). Clients that need the old raw behaviour should read registry_number.

Each PSC includes decoded natures_of_control_decoded with human-readable descriptions of the control type (e.g., "Owns 25-50% of shares" instead of ownership-of-shares-25-to-50-percent).

Companies exempt from PSC filing (e.g., listed PLCs on regulated markets) return has_psc_exemption: true with empty PSC lists.

Data is cached for 30 days. If the Companies House API is down, stale cached data is returned with cached: true in the response.

Example: /v1/company/12345678/psc

---

Upstream usage: 1 upstream call per unique company on first fetch (cached for 30 days). Companies with >100 PSCs require additional pagination calls.

{
  "cache_age_seconds": 3421,
  "cached": true,
  "credits_remaining": 487,
  "credits_used": 1,
  "data": {
    "company_age_years": 78,
    "company_name": "TESCO PLC",
    "company_number": "00445790",
    "company_status": "active",
    "company_type": "plc"
  },
  "data_source": "cached",
  "status": "success"
}