Company lists · Data refreshed November 2026

Top 25 Legacy system integration services based in France

RevenueBase identified 79 company matches for legacy system integration services associated with France as of November 2026 and tracks 896 professional contacts across them, including 317 with verified work emails. Paris is the largest hub.

This list covers company matches for legacy system integration services associated with France, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built
79Companies
896Contacts tracked
317Verified emails
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The 25 largest legacy system integration services based in France

Ranked by team size
Top 25 of 79 company matches for legacy system integration services based in France, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLabège, FranceHQ recorded Nov 6, 202651-200146 contacts →

Exact match

“Labsoft SSII accompagne des grands comptes régionaux et national ainsi que des PME PMI.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchMont-saint-aignan, FranceHQ recorded Nov 6, 202651-20072 contacts →

Exact match

“Attineos Infrastructures est une jeune ESN, spécialisée dans les Systèmes & Réseaux informatiques.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchRennes, FranceHQ recorded Nov 6, 202651-20046 contacts →

Exact match

“SpikeeLabs travaille auprès de ses clients sur la conception et la réalisation de leur système d’information.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchMoûtiers, FranceHQ recorded Nov 6, 2026n/a45 contacts →

Exact match

“STH, intégrateur informatique et Télécom vous accompagne depuis 20 ans sur vos déploiements, migrations et la disponibilité de vos infrastructures.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchParis, FranceHQ recorded Nov 6, 202611-5044 contacts →

Exact match

“Systemic, one of the first integrators of DELL Technologies in France, supports large companies in the study, recommendation, implementation and monitoring of their information…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact match69002, FranceHQ recorded Nov 6, 202651-20037 contacts →

Exact match

“Move Solutions is an IT services company specialized in development and transformation of information systems : Data Migration, Modernization and Maintenance.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchMalakoff, FranceHQ recorded Nov 6, 202651-20036 contacts →

Exact match

“Created in INFIDIS - Digital Services Company - is an integrator of technologies and services with high added value in IT.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchBoulogne-billancourt, FranceHQ recorded Nov 6, 202611-5029 contacts →

Exact match

“Architecte & intégrateur en infrastructures Cloud - privé, hybride ou public.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchParis, FranceHQ recorded Nov 6, 202611-5023 contacts →

Exact match

“Notre ADN : la qualité des développements et l’industrialisation des processus.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchParis, FranceHQ recorded Nov 6, 202611-5023 contacts →

Exact match

“Partis du constat il y a maintenant 15 ans qu’une informatique performante est au cœur d’une activité fructueuse, nous accompagnons depuis plus de 600 clients au quotidien dans la…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchSaint-jean-de-moirans, FranceHQ recorded Nov 6, 202611-5023 contacts →

Exact match

“Depuis plus de 15 ans, nos équipes œuvrent dans un but unique : Vous accompagner dans vos projets informatiques, des analyses et audit, à l’exploitation courante de votre SI, en…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchClermont-ferrand, FranceHQ recorded Nov 6, 202611-5018 contacts →

Exact match

“Créée en 1997, BECOMS (anciennement dénommé OMS) est un assembleur de technologies et de talents qui vous accompagne dans la transformation et les innovations technologiques de…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchParis, FranceHQ recorded Nov 6, 202611-5015 contacts →

Exact match

“Energy Way est une ESN spécialisée dans la modernisation et la transformation digitale des systèmes d’information critiques, avec une expertise reconnue en environnements…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchMassy, FranceHQ recorded Nov 6, 202611-5013 contacts →

Exact match

“Entreprise spécialisée dans le conseil en systèmes d'informations innovants intervenant dans des secteurs d’activité variés.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15Exact matchBoulogne-billancourt, FranceHQ recorded Nov 6, 202611-5012 contacts →

Exact match

“Square a pour ambition d’accompagner les entreprises dans la modernisation de leur système d’information et leur mouvement vers l’hybridation de leur infrastructure.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16Exact matchRoubaix, FranceHQ recorded Nov 6, 202611-5011 contacts →

Exact match

“We support businesses in managing and optimizing their data.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17Exact matchTours, FranceHQ recorded Nov 6, 202611-5011 contacts →

Exact match

“Depuis plus de 30 ans, NG Solutions (Neroisel) est un acteur majeur dans l'intégration de solutions de Gestion, systèmes réseaux et maintenance informatique.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18Exact matchGrasse, FranceHQ recorded Nov 6, 20261-1010 contacts →

Exact match

“Emerging-IT est spécialisée dans la gestion et le maintien en condition opérationnel d’infrastructure numérique.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19Exact matchSaint-apollinaire, FranceHQ recorded Nov 6, 20261-109 contacts →

Exact match

“Notre société est spécialisée dans l’intégration informatique.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20Exact matchParis, FranceHQ recorded Nov 6, 202651-2009 contacts →

Exact match

“Dans un marché obsédé par le time-to-market, nous défendons une idée simple : une application n'est pas un livrable, c'est un actif.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21Exact matchParis / Bordeaux, FranceHQ recorded Nov 6, 20261-108 contacts →

Exact match

“INOSI est un intégrateur spécialisé dans les INFRASTRUCTURES DES SYSTEMES D'INFORMATION.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22Exact matchAix En Provence Cedex 3, FranceHQ recorded Nov 6, 20261-107 contacts →

Exact match

“itheis is a major actor in the IBM i iSeries System i modernization market.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23Exact matchPompey, FranceHQ recorded Nov 6, 202611-507 contacts →

Exact match

“Fondée en 2007, Global Info est une Entreprise de Services du Numérique (ESN) qui délivre ses compétences dans trois domaines d’expertise différents : o L’intégration de solutions…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24Exact matchGuyancourt, FranceHQ recorded Nov 6, 202611-506 contacts →

Exact match

“KALIVA est une société de conseil et de services qui accompagne les entreprises dans leur transformation numérique.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25Exact matchBrignais, FranceHQ recorded Nov 6, 202611-505 contacts →

Exact match

“Dès sa création, Amilease Informatique s’est positionnée comme un des principaux acteurs de l’expertise des systèmes d’information en apportant une réponse globale aux besoins de…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 25 of 79 legacy system integration services based in France

See the full list, filter by size, metro and specialty, and access 317 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system integration services based in France at a glance

As of Nov 6, 2026
35.4%Verified-email coverage
11.3Average contacts per company
1-10Median size (employees)
24.1%Largest-city concentration · Paris
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
42
11-50
28
51-200
9

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 79 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with France whose business descriptions match “legacy system integration services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 317 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “legacy system integration services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system integration services are there based in France?

RevenueBase identified 79 company matches for legacy system integration services associated with France as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Labsoft tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most legacy system integration services?

Paris leads with 19 company records, followed by Lyon (4) and Boulogne Billancourt (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 317 professional contacts with verified work emails tracked across these 79 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.