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  1. Fonteum
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  3. Glossary
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  5. SIREN
Fonteum Data GlossaryData Standards

What is a SIREN?

A SIREN is the nine-digit French identifier assigned by INSEE to a legal unit, such as a company, association, entrepreneur, or public body. It stays at the legal-entity level. Establishments operated by that legal unit receive SIRET numbers that begin with the same SIREN.

Full name: French SIREN Number

Short explanation

The SIREN number is the legal-unit identifier in France's Sirene system, maintained by INSEE. It identifies the legal unit rather than a specific establishment or location. In company-register and entity-resolution work, SIREN is the legal-entity key for French organizations, while SIRET is the establishment-level key used when the question is about a physical site, branch, or operating location.

Related platform: Entity graph - resolved organization records

Last updated: 2026-07-11Reviewed by: Fonteum data standards desk — Source-provenance editorial review. Definitions checked against primary federal sources.

How it’s used

  • French legal-unit lookup: SIREN identifies the company, association, entrepreneur, or public body in French public registers.
  • SIREN/SIRET hierarchy: each establishment-level SIRET begins with the parent legal unit's nine-digit SIREN.
  • Fonteum keeps SIREN at the legal-entity layer so company-level facts do not collapse into location-level establishment facts.

Frequently asked questions

How many digits are in a SIREN?
A SIREN has nine digits and identifies a French legal unit.
Is SIREN the same as SIRET?
No. SIREN identifies the legal unit. SIRET identifies a specific establishment and starts with the same SIREN.
Can one SIREN have multiple SIRETs?
Yes. One French legal unit can operate multiple establishments, each with its own SIRET under the same SIREN.

Related terms

  • SIRET
  • SIREN vs SIRET
  • UK Company Number
  • LEI
  • Entity Resolution
  • Provenance
  • Due Diligence

Explore in Fonteum

How Fonteum sources, resolves, and publishes data tied to this term.

  • PlatformEntity graph - resolved organization records
  • PlatformProvider and organization data API
  • PlatformSource provenance model

Authoritative sources

  • INSEE: SIREN number↗
  • INSEE: Sirene business register↗
← All glossary terms

What’s on file, by the numbers

Platform snapshot · 2026-07-15

13.4Mproviders & companiesProviders, organizations, owners, and facilities on file
26.2Msource-linked factsSource-linked field facts in the dated platform snapshot
—sources liveCrosswalk-resolved sources with a proved content transition in the preceding 45 days
111sources integratedActive registry rows; integration does not establish a load
13state Medicaid jurisdictionsDistinct states represented in the state-exclusions serving table

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The platform records table row counts daily. Those observations detect local drift; they do not imply that an upstream publisher released or Fonteum ingested new data that day.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

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A public-records graph that exposes source and observation metadata where supplied.

Fonteum's provenance ledger contained 26.2M source-linked facts on July 12, 2026. All but 14 carried a source-file SHA-256; 0 linked deterministically to a signature. Inspect a supplied snapshot id at fonteum.com/verify · source-mark coverage and limitations.
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