YTJ — Finnish companies (PRH Open Data)

The Finnish business register: company lookups and search via the PRH Open Data API v3.

Yritys- ja yhteisötietojärjestelmä (YTJ) is the Finnish business register operated by the Finnish Patent and Registration Office (PRH). Provides access to company data, business IDs (Y-tunnus), addresses, industries and registration status for all Finnish companies and organisations.