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Osakeyhtiö (Finnish pronunciation: [ˈosɑkeˌyhtiø], "stock company") is the Finnish equivalent of a limited company (e.g., Ltd, LLC, or GmbH). It is abbreviated to oy (IPA: [oː yː]), and is used either before or after the company's name.
Some (mostly larger) Finnish companies such as Nokia now use English as their corporate language, but most Finnish companies use only Oy in the company name. However, the Swedish equivalent Aktiebolag, abbreviated Ab, can be used instead. If a company uses both Finnish and Swedish, then both may be used and the order of the abbreviations represents 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. For instance, Abloy was a primarily Swedish-speaking company.
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). 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.