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Osakeyhtiö literally a "stock company", is the Finnish equivalent of a limited company (Ltd or LLC) or Gesellschaft mit beschränkter Haftung (GmbH). It is abbreviated to Oy [oː yː] and is used either before or after the company's name, sometimes with the addition of (or replaced by) the Finland-Swedish equivalent Ab. (In Sweden, the abbreviation is written AB.)
Although some, especially larger, Finnish companies now use English as their corporate language (with Nokia being the most notable example), most Finnish companies use only Oy in the company name. If a company uses both Finnish and Swedish, then the order of the Finnish and Swedish abbreviations defines the main language of the company: Oy Company Ab or Company Oy Ab would have Finnish as its main language whereas Ab Company Oy or Company Ab Oy would have Swedish, Ab being the Swedish equivalent of Oy.
Julkinen osakeyhtiö (pl. Julkiset osakeyhtiöt) means "public stock company" and is abbreviated to Oyj (pronounced [oː yː jiː]). A julkinen osakeyhtiö can be listed on the Helsinki Stock Exchange. The term's Finland-Swedish equivalent is Abp (publikt aktiebolag); in Sweden, "AB (publ)". An Oyj may be called a public limited company or public company in English and may use the abbreviation PLC in the company name, for example.