Company lists · Data refreshed September 2026

Top 25 Industrial assembly contractors based in France

Name: Industrial assembly contractors based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 362 companies tracked

RevenueBase identified 362 industrial assembly contractors headquartered in France as of September 2026 and tracks 3,848 professional contacts across them, including 876 with verified work emails. Brest is the largest hub.

This list covers industrial assembly contractors headquartered in France, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

362Companies

3,848Contacts tracked

876Verified emails

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The 25 largest industrial assembly contractors based in France

Ranked by team size

Top 25 of 362 industrial assembly contractors based in France, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to industrial assembly contractors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	OSE Group	Indirect evidence	Angers, FranceHQ checked Sep 30, 2026	201-500	194 contacts →
	Indirect evidence “For more than 30 years, we have been working alongside you to bring you a global solution with ever more innovation.” Source: RevenueBase Database · checked Sep 30, 2026
2	Neyret Group GUY Neyret SA & Lagniel SA & Neyret INC	Partial evidence	Chaponost, FranceHQ checked Sep 30, 2026	201-500	129 contacts →
	Partial evidence “The Neyret Group is a major player recognized worldwide as one of the greatest manufacturer of customized assembly, test and print machines with an accumulated know how of more…” Source: RevenueBase Database · checked Sep 30, 2026
3	Steap Stailor	Indirect evidence	Seyssins, FranceHQ checked Sep 30, 2026	51-200	101 contacts →
	Indirect evidence “Design * Plant layout counselling * Comprehensive design of factories and manufacturing plant * Prototype design * Metal structure designs SteapStailor carries out complete…” Source: RevenueBase Database · checked Sep 30, 2026
4	Acerel	Partial evidence	Offranville, FranceHQ checked Sep 30, 2026	51-200	100 contacts →
	Partial evidence “EXPERTISES électricité industrielle (courants forts, courants faibles) automatisme / informatique industrielle 🦾 Robotique industrielle Instrumentation COMPETENCES 1⃣ Conception …” Source: RevenueBase Database · checked Sep 30, 2026
5	Chastagner	Partial evidence	La Ferté Bernard, FranceHQ checked Sep 30, 2026	51-200	89 contacts →
	Partial evidence “Basé en Pays de Loire, au cœur d'une des plus grandes régions industrielles de France, Chastagner conjugue depuis plus de 70 ans savoir-faire industriel, curiosité technologique…” Source: RevenueBase Database · checked Sep 30, 2026
6	GNT Industrie Maintenance	Partial evidence	Champigneulles, FranceHQ checked Sep 30, 2026	201-500	78 contacts →
	Partial evidence “Ensemblier Industriel \| Process-Génie électromécanique-Thermique industrielle-Tuyauterie-Chaudronnerie-Chauffage urbain” Source: RevenueBase Database · checked Sep 30, 2026
7	Ascent Integration Europe	Indirect evidence	Blagnac, FranceHQ checked Sep 30, 2026	51-200	71 contacts →
	Indirect evidence “Ascent Integration is a business unit of Ascent Aerospace, covering Europe and beyond based on customers' needs.” Source: RevenueBase Database · checked Sep 30, 2026
8	Probent	Partial evidence	Cherbourg En Cotentin, FranceHQ checked Sep 30, 2026	51-200	50 contacts →
	Partial evidence “Le groupe PROBENT est un groupe industriel Normand à envergure internationale.” Source: RevenueBase Database · checked Sep 30, 2026
9	Groupe Gonzales	Indirect evidence	Estrablin, FranceHQ checked Sep 30, 2026	201-500	48 contacts →
	Indirect evidence “Founded in 1971, Gonzales has established a solid reputation for expertise, high-quality services, versatility and responsiveness.” Source: RevenueBase Database · checked Sep 30, 2026
10	MAXEI	Partial evidence	Monchy Le Preux, FranceHQ checked Sep 30, 2026	51-200	45 contacts →
	Partial evidence “Créée en 1898, ARRAS MAXEI est une société industrielle française spécialisée dans la conception, fabrication et maintenance de machines & équipements sur mesure pour de nombreux…” Source: RevenueBase Database · checked Sep 30, 2026
11	Groupe OTS	Strong evidence	Malestroit, FranceHQ checked Sep 30, 2026	201-500	44 contacts →
	Strong evidence “Le Groupe OTS est un sous-traitant en tôlerie fine et industrielle, mécanique de précision, peinture, assemblage et montage.” Source: RevenueBase Database · checked Sep 30, 2026
12	Groupe Gami	Partial evidence	Corbas, FranceHQ checked Sep 30, 2026	51-200	39 contacts →
	Partial evidence “Groupe GAMI is a manufacturer of industrial equipment, with competences to support its clients from design to installation on site.” Source: RevenueBase Database · checked Sep 30, 2026
13	Defi Group SAS	Strong evidence	Mitry-mory, FranceHQ checked Sep 30, 2026	501-1,000	38 contacts →
	Strong evidence “Spécialisé dans l'industrialisation et la production de produits par transformation des métaux et assemblage de fonctions, DEFI GROUP est fournisseur européen de premier rang des…” Source: RevenueBase Database · checked Sep 30, 2026
14	MIS Maintenance Industrielle SUR Site	Partial evidence	Beauvais, FranceHQ checked Sep 30, 2026	51-200	37 contacts →
	Partial evidence “Fort de son expertise dans les métiers de l'usinage, la métallerie, la mécanique et l'électricité-automatisme, M.I.S c'est l'expertise au service des industriels dans des domaines…” Source: RevenueBase Database · checked Sep 30, 2026
15	Stal Industrie	Indirect evidence	Romorantin, FranceHQ checked Sep 30, 2026	51-200	36 contacts →
	Indirect evidence “10 m² de production à ROMORANTIN bureau d'études ateliers de fabrication métal et bois intégration de systèmes d'éclairage intégration de signalétiques atelier de préparation de…” Source: RevenueBase Database · checked Sep 30, 2026
16	Seeb Automation	Indirect evidence	St Priest En Jarez, FranceHQ checked Sep 30, 2026	51-200	32 contacts →
	Indirect evidence “Forte de son expérience, SEEB AUTOMATION décline son activité autour de trois métiers : l'ingénierie, la gestion de process et l'automatisme.” Source: RevenueBase Database · checked Sep 30, 2026
17	Ateliers Roche	Partial evidence	Reims, FranceHQ checked Sep 30, 2026	11-50	32 contacts →
	Partial evidence “Ateliers Roche : Le sur-mesure industriel Ateliers Roche, filiale dédiée du Groupe CIF dans la mécanosoudure, l’usinage de moyenne dimension et la gestion de projets d'industriels…” Source: RevenueBase Database · checked Sep 30, 2026
18	Ouest Industrie	Strong evidence	Dangers, FranceHQ checked Sep 30, 2026	51-200	31 contacts →
	Strong evidence “Ouest Industrie, créée en 1974, est une société de Tôlerie fine, d'assemblage et d'intégration d'ensembles et de sous-ensembles.” Source: RevenueBase Database · checked Sep 30, 2026
19	ERIL	Partial evidence	Pierre Bénite, FranceHQ checked Sep 30, 2026	11-50	29 contacts →
	Partial evidence “En 2021, signataire de la charte FrenchFab, offreurs de solutions pour tous les projets industriels.” Source: RevenueBase Database · checked Sep 30, 2026
20	Ms-Industrie	Partial evidence	Brécé, FranceHQ checked Sep 30, 2026	11-50	28 contacts →
	Partial evidence “MACHINES SPECIALES‑INDUSTRIE is a company specializing in the design and manufacturing of INDUSTRIAL MACHINES, AUTOMATION SYSTEMS, and ROBOTICS.” Source: RevenueBase Database · checked Sep 30, 2026
21	Aextis	Indirect evidence	Nonant, FranceHQ checked Sep 30, 2026	51-200	28 contacts →
	Indirect evidence “An on-site service provider committed to delivering complete solutions to meet your operational needs.” Source: RevenueBase Database · checked Sep 30, 2026
22	Actemium Mont Blanc Automation	Partial evidence	Cluses, FranceHQ checked Sep 30, 2026	11-50	27 contacts →
	Partial evidence “At ACTEMIUM MONT BLANC AUTOMATION, formerly known as ATIS, we are revolutionizing the manufacturing industry with our modular, flexible, and customizable assembly and testing…” Source: RevenueBase Database · checked Sep 30, 2026
23	RMI	Indirect evidence	Nomeny, FranceHQ checked Sep 30, 2026	11-50	26 contacts →
	Indirect evidence “MAINTENANCE Préventive, curative, prédictive et améliorative CONSTRUCTION, RECONSTRUCTION, MODIFICATION et RETOOLING * De la conception à l'intégration * Bureau d'études…” Source: RevenueBase Database · checked Sep 30, 2026
24	Rivoire Solutions Industrielles	Partial evidence	Reventin-vaugris, FranceHQ checked Sep 30, 2026	51-200	25 contacts →
	Partial evidence “Depuis plus de 30 ans, la société RIVOIRE vous accompagne dans vos projets industriels.” Source: RevenueBase Database · checked Sep 30, 2026
25	Transvis - CTI	Partial evidence	Rebréchien, FranceHQ checked Sep 30, 2026	11-50	25 contacts →
	Partial evidence “Fabricant de machines spéciales automatisées et robotisées et intégrateur de solutions industrielles sur mesure, TRANSVIS – CTI est une entreprise française située en plein cœur…” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: industrial assembly contractors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names industrial assembly contractors.
Partial evidence: Its own public description names part of industrial assembly contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial assembly contractors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 362 industrial assembly contractors based in France

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Industrial assembly contractors based in France at a glance

As of Sep 30, 2026

22.8%Verified-email coverage

10.6Average contacts per company

11-50Median size (employees)

0.8%Largest-city concentration · Brest

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

157

11-50

143

51-200

201-500

501-1,000

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 362 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among industrial assembly contractors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in France whose own description of what they do matches “industrial assembly contractors”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names industrial assembly contractors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among industrial assembly contractors, and records with no verified work email. Companies headquartered outside France are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 876 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names industrial assembly contractors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many industrial assembly contractors are there based in France?

RevenueBase identified 362 industrial assembly contractors headquartered in France as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

OSE Group, headquartered in Annemasse, tops this list with the largest team on record.

Which city has the most industrial assembly contractors?

Brest leads with 3 headquartered companies, followed by Chalon Sur Saone (3) and Ennery (3).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 876 verified decision-maker contacts tracked across these 362 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.