What is “OU”?
OU (Limited liability company (Estonian private limited company)) is a private limited liability company used primarily in Estonia. It signals limited liability and private ownership.
Where it's used
OU appears in company names registered in the following jurisdiction:
What it tells you about the company
Equivalent forms around the world
These are the closest structural equivalents to OU in other jurisdictions — same entity category, different national law.
Normalizing “OU” in your data
When matching or deduplicating company records, the legal suffix is noise — “Acme OU” and “Acme” should resolve to the same entity. One API call strips it and returns a stable canonical form:
curl -X POST https://api.ambect.com/v1/normalize/company \
-H "Authorization: Bearer $AMBECT_KEY" \
-H "Content-Type: application/json" \
-d '{"name": "Acme OU", "country": "ee"}'{
"data": {
"canonical": "acme ou",
"legal_type": null,
"tokens": [
"acme",
"ou"
]
},
"meta": {
"pipeline": [
"lowercase",
"legal_suffix"
],
"confidence": 0.99
}
}Frequently asked questions
What does OU mean?
OU means "Limited liability company (Estonian private limited company)".
Is a OU public or private?
A OU is a private entity — its shares are not publicly listed or traded on a stock exchange.
What is the liability in a OU?
Owners of a OU have limited liability. Their personal assets are protected, and their exposure is capped at the amount they invested.
Which countries use OU?
OU is used in Estonia.
Is a OU the same as a LLC?
Functionally comparable — both are private limited liability company forms — but they operate under different national laws with distinct formation, capital, and governance requirements.
Need to normalize OU at scale? The Ambect API handles it across 100+ countries in under 5 ms.
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