OyvsOYJ— What's the difference?
Oy (Osakeyhtiö) and OYJ (Julkinen osakeyhtiö) are both business entity forms. The core distinction is ownership: Oy is private while OYJ is public.
At a glance
Key differences
Where each is used
Both used in
Normalizing Oy and OYJ in your data
When deduplicating company records, both suffixes are noise — “Acme Oy” and “Acme OYJ” should resolve to the same entity. The Ambect API strips either suffix at the legal_suffix stage and records it separately:
// "Acme Oy" → canonical: "acme oy" // "Acme OYJ" → canonical: "acme oyj"
Frequently asked questions
What is the main difference between Oy and OYJ?
Oy is a private limited liability company, while OYJ is a public limited liability company. The key difference is ownership structure — Oy is private while OYJ is public.
Is Oy the same as OYJ?
No. Oy is a private limited liability company (limited liability, private) while OYJ is a public limited liability company (limited liability, public).
Which countries use both Oy and OYJ?
Both suffixes appear in Finland.
How does Ambect normalize Oy and OYJ?
The Ambect API strips both suffixes at the `legal_suffix` pipeline stage, recording each as `legal_type` in the response. This means "Acme Oy" and "Acme OYJ" both normalize to the canonical token "acme", enabling cross-suffix deduplication.
Explore each suffix
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