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How do I get a Siren number or a Siret?

Verified 01 January 2023 - Directorate for Legal and Administrative Information (Prime Minister)

Siren means company Directory Identification System.

It is composed of 9 digits.

Siret means Establishment Directory Identification System.

It is composed of 14 digits: the 9 digits of the Siren + 5 digits specific to each establishment (these 5 digits are called NIC, Insee internal classification number).

Please note

The Siren number is included in the Siret number, that is why you will often be asked the Siret your principal place of business or your head office.

The number Siren is unique identification number of a company.

The number Siret is the identifier of each establishments company. He gives geographical indication that the Siren doesn't give.

Example :

1 head office and 2 sales stores = 3 Siret numbers + 1 Siren.

1 head office and 1 production plant = 1 Siren + 2 Siret

2 different activities within a individual business = 1 Siren and as many Siret as establishments

1 individual business and 1 business = 2 Siren for each company and as many Siret as establishments

They assigned following your company registration (also called an activity report).

You have no steps to ask for them.

You will receive them automatically as soon as your application for registration is accepted.

You will then find your Siren and Siret in your personal space on Single window of company formalities.

Company formalities window


From 1to January 2023, it is no longer possible to make your paperwork in a company Formalities Centre (CFE). You have to make them on the website of company formalities window.

If you haven't received your Siren yet and you need it, you can make a search on Sirene directory ::

Know your Siren if you haven't received it yet

If you do not find it, your application for registration has not yet been accepted.


Insee no longer provides certificate of registration from 1to January 2023. You can find all your registration information on the website of the Single Window.

It allows access to all legal information and financial of a company.

These data are public. Anyone who wishes to do so can consult them.

You must mention the Siren on the payslip of employees, on all business documents and courier and administrative forms.

Assigning it automatically causes your company to be registered in the Sirene directory.

The Siren number enters composition other company identification numbers : the Siret and the intra-Community VAT number.

The Siret number is used to identify geographic your company and each establishment that makes it up.

Identifies the where activity.

You must mention the Siret on the payroll of the employees who work in the establishment concerned.

The Siret must be on the company invoices.

The Siren is assigned to you for life if you are an individual entrepreneur ISIS: titleContent.

If you are head of several companies as businesses (legal entities), you have a Siren number for each of them.

The Siren can only be removed in certain cases:

  • For an Individual Contractor (IO): upon the death of the Contractor or upon termination of business
  • For a business: When settlement

If your situation (or that of your company) changes or if your main activity changes: report each change to Single window of company formalities, regardless of the legal form of your company.

Company formalities window

The Siret changes every time the address of one of your establishments changes.

You need to report this change of address to Company formalities window.

You will then receive a new Siret number, which can be consulted on your personal space.

Company formalities window

This data is public.

Anyone can find or find the Siren or Siret number of a company if necessary. The legal and financial characteristics of the companies are accessible to all, either on the Sirene directory, or onCompany Directory.

Company Directory

TheCompany Directory allows:

  • Find the Siret or Siren number your company
  • Find company info other than yours (legal, financial)

Example :

You will find in particular the intra-Community VAT number, the APE code, the Siret of all companies registered in France and all publications at Bodacc: titleContent

Company Directory: Find all company information

You can search by name, by number of Siret or by number of Siren.

Sirene Directory

You can also consult the Sirene directory and request a company's "identity card":

Sirene Directory Situation Notice


You can use the MyIdenum online service to enable your company's digital identity.

This service is linked to the Commercial and business Register (CHN).

MyIdenum: The recognised digital identity to access your online services

If you see a anomaly in assigning your Siren or Siret numbers, you must written to INSEE Regional Directorate ::

Who shall I contact

Who can help me?

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