Business v1 / Firme

Related companies

The companies linked to this one through shared people (directors and shareholders), ordered by the number of people in common. Paginated (?pagina=&per_pagina=). Useful for identifying groups of companies.

GET

https://oneapi.ro/api/business/v1/firme/{cui}/conexe

Path parameters

NameTypeDescriptionExample

cuirequired string The company tax identification number, without the RO prefix (e.g. 6719278).

Query parameters

This route accepts no query parameters.

How it behaves

How we identify a person: by name + county of birth + date of birth, hashed into a fingerprint. The birth data is stored nowhere and never appears in the API; the fingerprint only separates people who share a name. Until 18 Sep 2026 identity was 'name + county', and the Trade Register leaves the county empty for 99.3% of representatives: every namesake in the country collapsed into one person, and companies with no real connection showed up as related (68% of the graph edges). Where the register has no date of birth (13% of mentions, mostly corporate liquidators), the person stays distinct at each company: we would rather lose a real link than invent one.
The companies related to the given one — those that share at least one person (administrator or associate). It is the basis for ownership and control graphs.
For the concrete path between two companies (how they are linked, through whom), use /firme/{cui}/conexe/{cui2} — a path search in the connection graph, up to a given depth.
Keep in mind the limitation from people: links are based on name + county matching, so there can be both omissions (the same person written differently) and false positives (namesakes in the same county).

What it is for

Ownership graphs and mapping of company groups.
Risk analysis of exposure to a group.
Investigations and data journalism.

Response structure

FieldTypeDescription

data[].cui integer The tax ID.

data[].denumire string | null The name.

data[].stare string | null The company status, as an object: denumire is the raw ONRC text (107 distinct values in use), categorie is our classification into 7 buckets — activa, suspendata, dizolvata, lichidare, radiata, insolventa, alta — which is what you filter or group by. cod is the ONRC code of the status.

data[].judet string | null The county.

data[].localitate string | null The locality.

data[].persoane_comune integer How many people hold mandates in both companies.

meta.paginare.pagina integer Pagina curentă.

meta.paginare.per_pagina integer Rezultate pe pagină.

meta.paginare.total integer Total rezultate.

meta.paginare.pagini integer Număr de pagini.

Response examples

GEThttps://oneapi.ro/api/business/v1/firme/6719278/conexe

{
    "data": [
        {
            "cui": 16114842,
            "denumire": "MASCO MANAGEMENT SRL",
            "stare": {
                "cod": "1084",
                "denumire": "radiată",
                "categorie": "radiata"
            },
            "judet": "București",
            "localitate": "București Sectorul 5",
            "persoane_comune": 1
        }
    ],
    "meta": {
        "paginare": {
            "pagina": 1,
            "per_pagina": 20,
            "total": 4,
            "pagini": 1
        }
    }
}

GEThttps://oneapi.ro/api/business/v1/firme/14399840/conexe

{
    "data": [
        {
            "cui": 404416,
            "denumire": "Bancpost SA",
            "stare": {
                "cod": "1084",
                "denumire": "radiată",
                "categorie": "radiata"
            },
            "judet": "București",
            "localitate": "București Sectorul 2",
            "persoane_comune": 1
        }
    ],
    "meta": {
        "paginare": {
            "pagina": 1,
            "per_pagina": 20,
            "total": 3,
            "pagini": 1
        }
    }
}

GEThttps://oneapi.ro/api/business/v1/firme/2054341/conexe

{
    "data": [
        {
            "cui": 49335041,
            "denumire": "ALGESO ADMIN S.R.L.",
            "stare": {
                "cod": "1048",
                "denumire": "funcțiune",
                "categorie": "activa"
            },
            "judet": "Neamț",
            "localitate": "Roman",
            "persoane_comune": 1
        }
    ],
    "meta": {
        "paginare": {
            "pagina": 1,
            "per_pagina": 20,
            "total": 2,
            "pagini": 1
        }
    }
}

GEThttps://oneapi.ro/api/business/v1/firme/24890577/conexe

{
    "data": [
        {
            "cui": 46003960,
            "denumire": "UNIVERS-ALL KMCS S.R.L.",
            "stare": {
                "cod": "1048",
                "denumire": "funcțiune",
                "categorie": "activa"
            },
            "judet": "Harghita",
            "localitate": "Gheorgheni",
            "persoane_comune": 1
        }
    ],
    "meta": {
        "paginare": {
            "pagina": 1,
            "per_pagina": 20,
            "total": 1,
            "pagini": 1
        }
    }
}

Error codes

Code	Slug	When it occurs
401	neautentificat	Token missing, invalid, expired or revoked.
403	feature_indisponibil	The current plan does not include the feature the route depends on.
404	negasit	The company with tax ID [{cui}] was not found.
422	validare	The route takes no parameters apart from `lang`: any other parameter returns 422 instead of being ignored.
429	cota_depasita	The plan's monthly quota has been exceeded (see `Retry-After`).

All errors share the same shape. eroare.cod is stable and is the value you should branch on in code — not the text in mesaj, which may change.

{
    "eroare": {
        "cod": "validare",
        "mesaj": "The route takes no parameters apart from lang: any other parameter returns 422 instead of being ignored.",
        "detalii": {
            "cui": [
                "The value sent does not satisfy the parameter rule."
            ]
        }
    }
}