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

What is a SIRET?

A SIRET is a 14-digit French establishment identifier. It combines the nine-digit SIREN of the legal unit with a five-digit NIC establishment code. Use SIRET when the question is about a specific location or site; use SIREN when the question is about the legal unit.

Full name: French SIRET Number

Short explanation

The SIRET number identifies an establishment in France's Sirene register. It is built from the legal unit's SIREN plus a five-digit NIC code assigned to the establishment. That structure makes SIRET useful for location-level questions, such as matching a branch, site, or office. It should not replace SIREN when the fact belongs to the legal unit as a whole.

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 establishment lookup: SIRET points to a specific site, office, or establishment linked to a legal unit.
  • Location matching: a company with several establishments can share one SIREN but hold separate SIRET values for each establishment.
  • Fonteum treats SIRET as a location-level identifier so addresses and operating sites are not merged into one legal-entity-only record.

Frequently asked questions

How many digits are in a SIRET?
A SIRET has 14 digits: the nine-digit SIREN plus a five-digit NIC establishment code.
What does a SIRET identify?
A SIRET identifies a specific establishment, such as a site, office, branch, or operating location.
Why does a SIRET start with a SIREN?
The SIRET embeds the legal unit's SIREN, then adds the NIC code that distinguishes one establishment from another.

Related terms

  • SIREN
  • 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: SIRET number↗
  • INSEE: NIC number↗
← 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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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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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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