Legal forms in Finland: Oy, Oyj, Ky and more

Every legal form in Finland, each with its abbreviation, the kind of entity it is, liability and typical use where they are well established, and the values the Prometiam company object returns.

This guide lists the 44 legal forms the Prometiam dictionary knows for Finland: what each is called, how it is abbreviated, what kind of entity it is and how it appears in the company object. Use it to read the legal_form of a company registered in Finland, or to decode a form you meet in a contract or on an invoice. It is a general reference, not legal advice.

Coverage and limits for Finland: company records only (no officers, no registry-compliance signal); insolvency notices are linked by business ID.

The main legal forms in Finland

FormAbbreviationKindWhat to know
OsakeyhtiöOy, AbPrivate limited companyA limited company (osakeyhtiö): shareholders’ liability is limited to their investment. There has been no minimum share capital since 2019, and it cannot offer shares to the public. The usual form for businesses.
Julkinen osakeyhtiöOyj, AbpPublic limited company (joint-stock company)A public limited company: it may offer its shares to the public and be listed.
Avoin yhtiöAy, ÖbGeneral partnershipA general partnership: the partners are jointly and personally liable without limit.
KommandiittiyhtiöKy, KbLimited partnershipA limited partnership: at least one partner is liable without limit, the limited partners only up to their contribution.
ToiminimiTmi, T:miSole proprietorshipA sole trader: no separate legal person, and the owner is personally liable.

How a legal form appears in the API

Every company object carries four legal-form fields: legal_form (the standard abbreviation, null when the form is not mapped), legal_form_family (the cross-country family, so a private limited company compares across countries), local_legal_form (the register’s own value or code as stored) and local_legal_form_name (the register’s name for it, where it publishes one). Each form below shows the values the API returns for it.

curl -H "Authorization: Bearer rk_live_..." \
  "https://api.prometiam.com/functions/v1/risk-api/companies/search?country=FI&name=<company name>"

# each result carries, for example:
#   "legal_form": "Oy"
#   "legal_form_family": "private_limited_company"

Private limited companies in Finland

Private limited company: a company with its own legal personality whose owners are, as a rule, not personally liable for its debts and whose shares are not offered to the public.

Osakeyhtiö (Oy)

A limited company (osakeyhtiö): shareholders’ liability is limited to their investment. There has been no minimum share capital since 2019, and it cannot offer shares to the public. The usual form for businesses.

  • English: Limited company
  • Also: Aktiebolag (Swedish)
  • Abbreviations: Oy, Ab, Oy Ab
  • In the API: legal_form Oy, legal_form_family private_limited_company, local_legal_form OY

Asunto-osakeyhtiö (As Oy)

  • Variant: real estate
  • English: Housing company
  • Also: Bostadsaktiebolag (Swedish)
  • Abbreviations: As Oy, Asunto Oy, Bostads Ab
  • In the API: legal_form As Oy, legal_form_family private_limited_company, local_legal_form AOY

Keskinäinen kiinteistöosakeyhtiö

  • Variant: real estate
  • English: Limited liability joint-stock property company
  • Also: Ömsesidigt fastighetsaktiebolag (Swedish)
  • Abbreviations: Kiinteistö Oy, Fastighets Ab
  • In the API: legal_form Kiinteistö Oy, legal_form_family private_limited_company, local_legal_form KOY

Vakuutusosakeyhtiö

  • English: Limited insurance company
  • Also: Försäkringsaktiebolag (Swedish)
  • In the API: legal_form Limited insurance company, legal_form_family private_limited_company, local_legal_form VOY

Muu kiinteistöosakeyhtiö

  • Variant: real estate
  • English: Other real estate limited company
  • Also: Annat fastighetsaktiebolag (Swedish)
  • In the API: legal_form Other real estate limited company, legal_form_family private_limited_company, local_legal_form 56

Public limited companies in Finland

Public limited company (joint-stock company): a company with its own legal personality and share capital whose owners are, as a rule, not personally liable; the family of forms that can usually raise money from the public.

Julkinen osakeyhtiö (Oyj)

A public limited company: it may offer its shares to the public and be listed.

  • English: Public limited company
  • Also: Publikt aktiebolag (Swedish)
  • Abbreviations: Oyj, Abp, Oyj Abp
  • In the API: legal_form Oyj, legal_form_family public_limited_company, local_legal_form OYJ

Eurooppayhtiö (SE)

  • Variant: European-law form
  • English: European company
  • Also: Europabolag (SE) (Swedish)
  • Abbreviations: SE
  • In the API: legal_form SE, legal_form_family public_limited_company, local_legal_form SE

Julkinen vakuutusosakeyhtiö

  • English: Public limited insurance company
  • Also: Publikt försäkringsaktiebolag (Swedish)
  • In the API: legal_form Public limited insurance company, legal_form_family public_limited_company, local_legal_form VOJ

General partnerships in Finland

General partnership: the owners run the business together and, as a rule, answer personally for its debts.

Avoin yhtiö (Ay)

A general partnership: the partners are jointly and personally liable without limit.

  • English: General partnership
  • Also: Öppet bolag (Swedish)
  • Abbreviations: Ay, Öb
  • In the API: legal_form Ay, legal_form_family general_partnership, local_legal_form AY

Limited partnerships in Finland

Limited partnership: at least one partner answers without limit for the debts, the others only up to what they contributed.

Kommandiittiyhtiö (Ky)

A limited partnership: at least one partner is liable without limit, the limited partners only up to their contribution.

  • English: Limited partnership
  • Also: Kommanditbolag (Swedish)
  • Abbreviations: Ky, Kb
  • In the API: legal_form Ky, legal_form_family limited_partnership, local_legal_form KY

Sole proprietorships in Finland

Sole proprietorship: one person trading in their own name with no separate company; the owner is, as a rule, personally liable.

Toiminimi (Tmi)

A natural person, not a company. A sole trader: no separate legal person, and the owner is personally liable.

  • English: Sole trader
  • Also: Firma (Swedish)
  • Abbreviations: Tmi, T:mi
  • In the API: legal_form Tmi, legal_form_family sole_proprietorship, local_legal_form the register’s own text

Cooperatives in Finland

Cooperative: an organisation owned and run by its members.

Osuuskunta (osk)

  • English: Cooperative
  • Also: Andelslag (Swedish)
  • Abbreviations: osk
  • In the API: legal_form osk, legal_form_family cooperative, local_legal_form OK

Eurooppaosuuskunta

  • Variant: European-law form
  • English: European co-operative society
  • Also: Europaandelslag (Swedish)
  • In the API: legal_form European co-operative society, legal_form_family cooperative, local_legal_form SCE

Eurooppaosuuspankki

  • Variant: European-law form, banking and credit
  • English: European co-operative bank
  • Also: Europaandelsbank (Swedish)
  • In the API: legal_form European co-operative bank, legal_form_family cooperative, local_legal_form SCP

Hypoteekkiyhdistys

  • Variant: banking and credit
  • English: Mortgage society
  • Also: Hypoteksförening (Swedish)
  • In the API: legal_form Mortgage society, legal_form_family cooperative, local_legal_form HY

Osuuspankki (OP)

  • Variant: banking and credit
  • English: Co-operative bank
  • Also: Andelsbank (Swedish)
  • Abbreviations: OP
  • In the API: legal_form OP, legal_form_family cooperative, local_legal_form OP

Taloudellinen yhdistys

  • Variant: legacy value
  • English: Association for carrying on economic activity
  • Also: Ekonomisk förening (Swedish)
  • In the API: legal_form Association for carrying on economic activity, legal_form_family cooperative, local_legal_form TYH

Asunto-osuuskunta

  • Variant: real estate
  • English: Housing co-operative
  • Also: Bostadsandelslag (Swedish)
  • In the API: legal_form Housing co-operative, legal_form_family cooperative, local_legal_form 1

Muu taloudellinen yhdistys

  • English: Other economic association
  • Also: Annan ekonomisk förening (Swedish)
  • In the API: legal_form Other economic association, legal_form_family cooperative, local_legal_form 38

Civil partnerships in Finland

Civil partnership: a company under civil rather than commercial law, often used for property holding, farming or professional practices.

Elinkeinoyhtymä

  • English: Business partnership
  • Also: Näringssammanslutning (Swedish)
  • In the API: legal_form Business partnership, legal_form_family civil_partnership, local_legal_form 57

Economic interest groupings in Finland

Economic interest grouping: members cooperate in a shared activity while staying independent businesses.

Eurooppalainen taloudellinen etuyhtymä

  • Variant: European-law form
  • English: European economic interest grouping
  • Also: Europeisk ekonomisk intressegruppering (Swedish)
  • In the API: legal_form European economic interest grouping, legal_form_family economic_interest_grouping, local_legal_form ETY

Associations in Finland

Association: a membership body, usually non-profit.

Rekisteröity yhdistys (ry)

  • English: Registered association
  • Also: Registrerad förening (Swedish)
  • Abbreviations: ry, rf, r.y.
  • In the API: legal_form ry, legal_form_family association, local_legal_form AYH

Asumisoikeusyhdistys

  • Variant: real estate
  • English: Right-of-occupancy association
  • Also: Bostadsrättsförening (Swedish)
  • In the API: legal_form Right-of-occupancy association, legal_form_family association, local_legal_form ASY

Muu yhdistys

  • English: Other association
  • Also: Annan förening (Swedish)
  • In the API: legal_form Other association, legal_form_family association, local_legal_form 29

Metsänhoitoyhdistys

  • English: Forest management association
  • Also: Skogsvårdsförening (Swedish)
  • In the API: legal_form Forest management association, legal_form_family association, local_legal_form 35

Uskonnollinen yhdyskunta

  • English: Religious community
  • Also: Religiöst samfund (Swedish)
  • In the API: legal_form Religious community, legal_form_family association, local_legal_form 46

Foundations in Finland

Foundation: assets set aside for a purpose, with no owners.

Säätiö (sr)

  • English: Foundation
  • Also: Stiftelse (Swedish)
  • Abbreviations: sr, sr.
  • In the API: legal_form sr, legal_form_family foundation, local_legal_form SÄÄ

Muu säätiö

  • English: Other foundation
  • Also: Annan stiftelse (Swedish)
  • In the API: legal_form Other foundation, legal_form_family foundation, local_legal_form 39

Mutuals in Finland

Mutual: a body owned by its members, typical for insurance and guarantees.

Julkinen keskinäinen vakuutusyhtiö

  • English: Public mutual insurance company
  • Also: Publikt ömsesidigt försäkringsbolag (Swedish)
  • In the API: legal_form Public mutual insurance company, legal_form_family mutual, local_legal_form KVJ

Keskinäinen vakuutusyhtiö

  • English: Mutual insurance company
  • Also: Ömsesidigt försäkringsbolag (Swedish)
  • In the API: legal_form Mutual insurance company, legal_form_family mutual, local_legal_form KVY

Vakuutusyhdistys

  • English: Insurance association
  • Also: Försäkringsförening (Swedish)
  • In the API: legal_form Insurance association, legal_form_family mutual, local_legal_form VY

Branches of foreign companies in Finland

Branch of a foreign company: an establishment or registration of a company incorporated abroad.

Euroopp.taloudell.etuyht.sivutoimipaikka

  • Variant: European-law form
  • English: Finnish branch of a European economic interest grouping
  • Also: Filial till europeisk ekonomisk intressegruppering (Swedish)
  • In the API: legal_form Finnish branch of a European economic interest grouping, legal_form_family branch_of_foreign_company, local_legal_form ETS

Sivuliike

  • English: Branch of a foreign trader
  • Also: Filial (Swedish)
  • In the API: legal_form sivuliike, legal_form_family branch_of_foreign_company, local_legal_form SL

Public bodies in Finland

Public body: a state, local-authority or other public-law entity.

Valtion liikelaitos

  • Variant: publicly owned
  • English: State-owned company
  • Also: Statens affärsverk (Swedish)
  • In the API: legal_form State-owned company, legal_form_family public_body, local_legal_form VALTLL

Co-ownerships in Finland

Co-ownership: joint ownership of property by several owners, often without legal personality.

Yhteisetuudet

  • English: Joint interest groups
  • Also: Samfällda förmåner (Swedish)
  • In the API: legal_form Joint interest groups, legal_form_family co_ownership, local_legal_form 50

Yhteismetsä

  • English: Collective forest
  • Also: Samfälld skog (Swedish)
  • In the API: legal_form Collective forest, legal_form_family co_ownership, local_legal_form 55

Estates and trusts in Finland

Estate or trust: assets held for heirs, creditors or beneficiaries.

Konkurssipesä

  • English: Bankrupt's estate
  • Also: Konkursbo (Swedish)
  • In the API: legal_form Bankrupt's estate, legal_form_family estate_or_trust, local_legal_form 54

Other entity types in Finland

Other entity type.

Asukashallintoalue

  • English: Resident-administered area
  • Also: Boendeförvaltningsområde (Swedish)
  • In the API: legal_form Resident-administered area, legal_form_family other, local_legal_form ASH

Säästöpankki

  • Variant: banking and credit
  • English: Savings bank
  • Also: Sparbank (Swedish)
  • In the API: legal_form Savings bank, legal_form_family other, local_legal_form SP

Ulkomainen yhteisö

  • English: Foreign organisation
  • Also: Utländskt samfund (Swedish)
  • In the API: legal_form Foreign organisation, legal_form_family other, local_legal_form 60

Verotusyhtymä

  • English: Taxable grouping
  • Also: Beskattningssammanslutning (Swedish)
  • In the API: legal_form Taxable grouping, legal_form_family other, local_legal_form 51

Muu yhteisvast.pidätysvelvollinen

  • English: Other subject with joint liability to tax withholding
  • Also: Annan solidariskt ansvarig innehållningspliktig (Swedish)
  • In the API: legal_form Other subject with joint liability to tax withholding, legal_form_family other, local_legal_form 52

Paikallisyhteisö

  • English: Local community
  • Also: Lokalsamfund (Swedish)
  • In the API: legal_form Local community, legal_form_family other, local_legal_form 71

Muut oikeushenkilöt

  • English: Other juridical persons
  • Also: Övriga juridiska personer (Swedish)
  • In the API: legal_form Other juridical persons, legal_form_family other, local_legal_form 63

Look up a FI company

See the Finland company data API guide for the register behind these records and the free Y-tunnus lookup to try an identifier. For the register states that go with these forms, read company status in Finland. All countries: company legal forms.

Check legal forms in your own data

Search by name or identifier and read legal_form, legal_form_family and local_legal_form on every result, or filter a bulk list by family.

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Frequently asked questions

What does Oy mean in Finland?
Oy stands for Osakeyhtiö, in English limited company. A limited company (osakeyhtiö): shareholders’ liability is limited to their investment. There has been no minimum share capital since 2019, and it cannot offer shares to the public. The usual form for businesses. In the Prometiam API it is returned as legal_form "Oy" with legal_form_family "private_limited_company".
What does Oyj mean in Finland?
Oyj stands for Julkinen osakeyhtiö, in English public limited company. A public limited company: it may offer its shares to the public and be listed. In the Prometiam API it is returned as legal_form "Oyj" with legal_form_family "public_limited_company".
How do I find out which legal form a FI company has?
Search GET /companies/search?country=FI&name=... and read legal_form (the standard abbreviation), legal_form_family and local_legal_form (the register's own value) on each result.