Data / France companies / Yvelines / Montfort-l'Amaury

Companies in Montfort-l'Amaury, Yvelines: 502 active companies by industry

Updated November 7, 2026. Source: INSEE, base Sirene des entreprises et de leurs établissements, on data.gouv.fr.

502 active companies have their head office in Montfort-l'Amaury, Yvelines, in the Sirene register stock dated 1 November 2026. 23 were registered in the last 12 months, 1 of them in October 2026, and 84 have employees.

The request: Every French company with head office in Montfort-l'Amaury, with SIREN, NAF code, registration date, address and employee band. $10 of work on sign-up, no card.

SpecStream is the live web data engine for teams and agents. It reads the Sirene register every month, and this page is that reading. Ask for the companies you track by industry, place or registration date and each new company arrives in your sheet, CRM, Slack or agent.

• 502Active companies
• 23Registered in the last 12 months
• 1Registered in October 2026
• 84 (16.7%)With employees
• YvelinesDepartment
• 78420Commune code

Registrations in the last 12 months

Active companies by the month their registration date falls in. The newest month is the last full month before the stock date.

Registrations per year

Companies registered in each year that are still active in the 1 November 2026 stock. Companies that closed earlier are not counted, so older years read low.

By number of employees

The employee band the register holds for each company, as declared for its latest reference year.

Biggest industries

A link opens the industry in this town where 80 or more companies list it.

Newest registered companies

Newest first. Only companies with a name that is clearly a business are listed; the counts above include every active company. Each row links to the public record.

Licence Ouverte / Open Licence 2.0 (Etalab), source INSEE. Counts are of active companies in the Sirene register stock dated 1 November 2026: commercial companies (SARL, SAS, SA and the like) and civil companies such as SCI property companies. Sole traders, associations and public bodies are not counted, and the register lists dormant holding and property companies as active, so a count is of companies on the register, not of trading businesses. A company is counted under its main activity (NAF rev. 2 code) and the commune of its head office; companies whose register entry holds no NAF rev. 2 code are in the totals only. "With employees" means the register holds an employee band of one or more. Industry titles are English renderings of the INSEE labels. Contains data from INSEE, reused under the Licence Ouverte 2.0. This page is not endorsed by INSEE. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.