EUID (European Unique Identifier)

The EUID is the key the EU's Business Registers Interconnection System uses to name a company: a country code, a register code and the national registration number, in one string. BRIS was created to let member state registers exchange information about cross-border companies, and the EUID is what they exchange it against. Structurally it is the complete form of a company number, carrying the country and the issuing register in the identifier itself rather than leaving them to be inferred — exactly the information a bare national number loses.

It is the only pan-European registry-issued key that exists, and its practical weakness is supply. Member states publish it inconsistently, so a dataset keyed on EUID covers far less than the union it nominally spans, and most European company data in circulation is keyed on national numbers instead.

Where it is available it removes a whole class of joining error, because two EUIDs are comparable without any knowledge of which register issued which number space.

Entity Bind carries EUID as a typed identifier where a register publishes it — Finland's PRH feed is the most reliable current supply — and treats it the way it treats any authority-scoped registration number: matched on scope-aware equality, with a conflict treated as decisive rather than as weak evidence.