The SIRET has 14 digits, split into two parts:
For example, for company 123 456 789, the headquarters might have the SIRET 123 456 789 00012 and a branch 123 456 789 00020. Same SIREN, different NICs.
Each physically distinct establishment — a location where the company operates — receives its own SIRET. The registered office always has one, marked as the head office in the directory.
The confusion is common. The rule is simple:
| Criteria | SIREN | SIRET |
|---|---|---|
| Length | 9 digits | 14 digits |
| Identifies | The company (legal entity) | An establishment |
| Composition | Standalone | SIREN + NIC (5 digits) |
| Number per company | 1 | As many as there are establishments |
| Changes if relocated | No | Yes (new SIRET) |
In short: the SIREN says who, the SIRET says where. A single-establishment company has one SIREN and one SIRET; a multi-site company has one SIREN and multiple SIRETs.
The SIRET is the data that allows you to invoice and deliver to the correct establishment. Two branches of the same group share the SIREN but have different addresses, contacts and sometimes terms: the SIRET distinguishes them.
Linking an opportunity to the SIRET rather than just the SIREN prevents mistakenly aggregating the turnover of an entire group into a single record, and ensures documents (quotes, invoices, delivery notes) are routed to the correct site. A CRM that manages the SIREN/SIRET pair properly distinguishes the parent company from its establishments.
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Essai gratuit 14 jours What the Orizen CRM module costsYes. If a business establishment changes its address, INSEE assigns it a new SIRET (the NIC changes), as the NIC is tied to a specific location. The company’s SIREN, however, remains unchanged. This is a key difference from the SIREN, which never changes throughout the company’s lifetime.
Yes. A company has as many SIRETs as it has establishments: the head office has its own, and each branch, workshop or separate point of sale has its own SIRET. All share the first 9 digits (the common SIREN), only the 5-digit NIC varies from one establishment to another.
The SIRET appears on the establishment’s SIRENE status notice, on its invoices (mandatory mention) and in the official business directory. It is also accessible via the INSEE Sirene API. A CRM like Orizen can query this source to automatically link a record to the correct establishment and avoid confusing head offices with branches.