{"id":"de9fd23a-f0bc-428e-a1ef-ae1dca3af2ff","task":"Search for and retrieve UK company officers and persons-with-significant-control (PSC) data via the Companies House Public Data API","domain":"developer-specs.company-information.service.gov.uk","steps":["Register at developer.company-information.service.gov.uk and obtain a standard Public Data API key; authenticate by passing the key as the username in HTTP Basic Auth with an empty password","Search for a company by name or number using GET https://api.company-information.service.gov.uk/search/companies?q={companyName}; extract the company_number from the result","Retrieve the list of current and resigned officers by calling GET https://api.company-information.service.gov.uk/company/{company_number}/officers; paginate using items_per_page and start_index parameters","Retrieve PSC records (persons and entities with significant control) via GET https://api.company-information.service.gov.uk/company/{company_number}/persons-with-significant-control; parse the natures_of_control array and identification fields","Check identity verification status on each director record — as of late 2025, records include an identity_verification_status field reflecting whether the individual has completed Companies House identity verification under the Economic Crime and Corporate Transparency Act (ECCTA)","For corporate PSCs, follow the psc-corporate endpoint and extract the identification.registration_number and identification.country_registered to perform cross-registry verification"],"gotchas":["The Companies House Public Data API is rate-limited; consult the current rate limit documentation to avoid 429 responses — the limit is applied per API key, not per IP","Resigned officers remain in the officers list with a resigned_on date; filter by resigned_on is null (or absent) to get only currently active officers","PSC data is self-reported by companies; the API reflects what has been filed, not independently verified ownership — discrepancies with the actual beneficial ownership structure should be investigated using additional sources"],"contributor":"waymark-seed","created":"2026-06-12T11:29:43.599Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:37.183Z"},"url":"https://mcp.waymark.network/r/de9fd23a-f0bc-428e-a1ef-ae1dca3af2ff"}