Company lists · Data refreshed September 2026

Top 25 Mechanical assembly companies based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 390 companies tracked

RevenueBase identified 390 mechanical assembly companies headquartered in France as of September 2026 and tracks 4,525 professional contacts across them, including 780 with verified work emails. Annecy is the largest hub.

This list covers mechanical assembly companies 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 20, 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 20, 2026 86% judged on-target in blind review

390Companies

4,525Contacts tracked

780Verified emails

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The 25 largest mechanical assembly companies based in France

Ranked by team size

Top 25 of 390 mechanical assembly companies based in France, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to mechanical assembly companies: 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	Defontaine Rollix	Strong evidence	La Bruffière, FranceHQ checked Sep 20, 2026	1,001-5,000	228 contacts →
	Strong evidence “Defontaine Group is an international group that designs and manufactures complex mechanical parts and sub-assemblies.” Source: RevenueBase Database · checked Sep 20, 2026
2	OSE Group	Indirect evidence	Angers, FranceHQ checked Sep 20, 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 20, 2026
3	Mecahers Group	Partial evidence	Launaguet, FranceHQ checked Sep 20, 2026	501-1,000	155 contacts →
	Partial evidence “MECAHERS est une filiale du groupe MECACHROME, spécialisée dans la tôlerie, l’assemblage, l’usinage, le traitement de surface et les composites.” Source: RevenueBase Database · checked Sep 20, 2026
4	Neyret Group GUY Neyret SA & Lagniel SA & Neyret INC	Partial evidence	Chaponost, FranceHQ checked Sep 20, 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 20, 2026
5	Chastagner	Indirect evidence	La Ferté Bernard, FranceHQ checked Sep 20, 2026	51-200	89 contacts →
	Indirect 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 20, 2026
6	GNT Industrie Maintenance	Indirect evidence	Champigneulles, FranceHQ checked Sep 20, 2026	201-500	78 contacts →
	Indirect evidence “Ensemblier Industriel \| Process-Génie électromécanique-Thermique industrielle-Tuyauterie-Chaudronnerie-Chauffage urbain” Source: RevenueBase Database · checked Sep 20, 2026
7	Conorm	Indirect evidence	Pierres, FranceHQ checked Sep 20, 2026	51-200	68 contacts →
	Indirect evidence “Expert depuis plus de vingt ans en sous-traitance mécanique de précision pour les secteurs de l’Aéronautique, de l’Armement et de la Défense, nous sommes spécialisés dans…” Source: RevenueBase Database · checked Sep 20, 2026
8	Selva Electronique	Partial evidence	Vallet, FranceHQ checked Sep 20, 2026	51-200	59 contacts →
	Partial evidence “Selva, implantée à Vallet & Chalon-sur-Saône, est spécialisée dans la conception, la fabrication et l'assemblage de cartes électroniques.” Source: RevenueBase Database · checked Sep 20, 2026
9	Bronze ALU Group	Indirect evidence	La Couture Boussey, FranceHQ checked Sep 20, 2026	51-200	57 contacts →
	Indirect evidence “Bronze Alu conçoit, industrialise et fabrique des pièces et ensembles mécaniques” Source: RevenueBase Database · checked Sep 20, 2026
10	Otima Industries	Indirect evidence	Région De Rennes, FranceHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “OTIMA Industries est une entreprise spécialisée dans la sous-traitance industrielle en tôlerie fine située à Fougères, à proximité de Rennes.” Source: RevenueBase Database · checked Sep 20, 2026
11	Groupe OTS	Partial evidence	Malestroit, FranceHQ checked Sep 20, 2026	201-500	44 contacts →
	Partial 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 20, 2026
12	Mecanyvois	Indirect evidence	Carignan, FranceHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “MECANYVOIS offre des solutions entièrement intégrées en ingénierie et outillage.” Source: RevenueBase Database · checked Sep 20, 2026
13	Defi Group SAS	Partial evidence	Mitry-mory, FranceHQ checked Sep 20, 2026	501-1,000	38 contacts →
	Partial 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 20, 2026
14	Stal Industrie	Indirect evidence	Romorantin, FranceHQ checked Sep 20, 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 20, 2026
15	Devismes	Indirect evidence	Feuquieres-en-vimeu, FranceHQ checked Sep 20, 2026	51-200	35 contacts →
	Indirect evidence “Implantée en Picardie à 1h30 au nord de Paris (autoroutes A1 et A16), DEVISMES S.A.” Source: RevenueBase Database · checked Sep 20, 2026
16	Ateliers Roche	Indirect evidence	Reims, FranceHQ checked Sep 20, 2026	11-50	32 contacts →
	Indirect 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 20, 2026
17	Lagniel SAS	Partial evidence	Douvres-la-délivrande, FranceHQ checked Sep 20, 2026	51-200	31 contacts →
	Partial evidence “LAGNIEL, appartenant au groupe NEYRET, est une entreprise spécialisée dans le domaine de la conception et la réalisation de machines spéciales d'assemblage et de contrôle à haute…” Source: RevenueBase Database · checked Sep 20, 2026
18	Actemium Annecy Automation	Indirect evidence	Annecy, FranceHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “TECHNIC AUTOMATION SUISSE S.A.R.L.” Source: RevenueBase Database · checked Sep 20, 2026
19	Ouest Industrie	Partial evidence	Dangers, FranceHQ checked Sep 20, 2026	51-200	31 contacts →
	Partial 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 20, 2026
20	ERIL	Indirect evidence	Pierre Bénite, FranceHQ checked Sep 20, 2026	11-50	29 contacts →
	Indirect evidence “En 2021, signataire de la charte FrenchFab, offreurs de solutions pour tous les projets industriels.” Source: RevenueBase Database · checked Sep 20, 2026
21	Altitude Industrie	Partial evidence	Vinzelles, FranceHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “ALTITUDE INDUSTRIE provides its expertise for your subcontracting projects in precision machining and assembly.” Source: RevenueBase Database · checked Sep 20, 2026
22	Actemium Mont Blanc Automation	Partial evidence	Cluses, FranceHQ checked Sep 20, 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 20, 2026
23	DGC Industries	Partial evidence	Magland, FranceHQ checked Sep 20, 2026	11-50	24 contacts →
	Partial evidence “Our expertise in traditional bar turning, CNC machining, and co-design, associated with a modern machinery enables us to manufacture a wide array of mechanical parts, from Ø2mm up…” Source: RevenueBase Database · checked Sep 20, 2026
24	Imetal	Indirect evidence	Saint-laurent-de-brèvedent, FranceHQ checked Sep 20, 2026	11-50	23 contacts →
	Indirect evidence “iMetal, entreprise de 40 ans de savoir-faire du travail du métal.” Source: RevenueBase Database · checked Sep 20, 2026
25	Garnier Durand	Indirect evidence	Foecy, FranceHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “Entreprises spécialisée dans le domaine de la sous traitance mécanique” Source: RevenueBase Database · checked Sep 20, 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: mechanical assembly companies. 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 mechanical assembly companies.
Partial evidence: Its own public description names part of mechanical assembly companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mechanical assembly companies. 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 390 mechanical assembly companies based in France

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Mechanical assembly companies based in France at a glance

As of Sep 20, 2026

17.2%Verified-email coverage

11.6Average contacts per company

11-50Median size (employees)

1.0%Largest-city concentration · Annecy

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

126

11-50

195

51-200

201-500

501-1,000

1,001-5,000

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 390 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 mechanical assembly companies, 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 “mechanical assembly companies”. 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 mechanical assembly companies), 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 mechanical assembly companies, 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, 780 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 20, 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 mechanical assembly companies, 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 mechanical assembly companies are there based in France?

RevenueBase identified 390 mechanical assembly companies 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?

Defontaine Rollix, headquartered in La Bruffiere, tops this list with the largest team on record.

Which city has the most mechanical assembly companies?

Annecy leads with 4 headquartered companies, followed by Chassieu (3) and Civens (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 780 verified decision-maker contacts tracked across these 390 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 20, 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.