Company numbers
You hold company registration numbers for customers, suppliers or prospects — from your accounts system, contracts or credit checks. It is the cleanest join in UK data: one company, one number, no ambiguity.
Charity Register (England & Wales)
Company numbers — for charitable companies — About 31,000 charities are also companies and carry a CRN; zero-pad to 8 digits before joining to Companies House
Filed Company Accounts (Companies House Accounts Data)
Company numbers you hold for customers, suppliers or prospects — The CRN is embedded in each filing's filename (position 3, zero-padded to 8 digits) — join straight to the UK Company Register
UK Company Register (Companies House Company Data)
Company numbers you hold for customers, suppliers or prospects — CompanyNumber is the 8-character CRN, zero-padded — the master key across every Companies House product
Persons with Significant Control (PSC)
Company numbers — Already zero-padded to 8 digits — joins directly to Companies House company data and accounts
Gender Pay Gap Reports
Company numbers — Zero-pad to 8 digits before joining to Companies House; not populated for some public-sector bodies
Public Contracts (Contracts Finder)
Company numbers — Suppliers and buyers registered with Companies House carry a CRN; take the identifier where the scheme is GB-COH and zero-pad to 8 digits