Company lists · Data refreshed September 2026

Top 25 Legacy system modernization companies based in Paris, France

Name: Legacy system modernization companies based in Paris, France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 542 companies tracked

RevenueBase identified 542 legacy system modernization companies headquartered in Paris, France as of September 2026 and tracks 338,450 professional contacts across them, including 141,675 with verified work emails. Paris is the largest hub.

This list covers legacy system modernization companies headquartered in Paris, 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

542Companies

338,450Contacts tracked

141,675Verified emails

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The 25 largest legacy system modernization companies based in Paris, France

Ranked by team size

Top 25 of 542 legacy system modernization companies based in Paris, France, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization 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	Capgemini	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	284,286 contacts →
	Indirect evidence “Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value.” Source: RevenueBase Database · checked Sep 20, 2026
2	Sopra Steria	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	36,960 contacts →
	Indirect evidence “Sopra Steria, a major Tech player in Europe with employees in nearly 30 countries, is recognised for its consulting, digital services and solutions.” Source: RevenueBase Database · checked Sep 20, 2026
3	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	10001+	4,928 contacts →
	Indirect evidence “Le groupe SII est une société d’ingénierie et de conseil en technologies (ICT) et une entreprise de services numériques (ESN) créée en 1979 par Bernard HUVÉ, ingénieur de…” Source: RevenueBase Database · checked Sep 20, 2026
4	Prodware	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	1,001-5,000	1,394 contacts →
	Indirect evidence “At Prodware, we believe that Trust, Audacity, and Passion are the driving forces behind meaningful digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
5	Neosoft	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	1,001-5,000	1,240 contacts →
	Indirect evidence “Néosoft est un groupe indépendant de conseil en transformation digitale de 1800 collaborateurs réunis en communautés d’experts : Conseil & Agilité, Cybersécurité, Data, DevOps…” Source: RevenueBase Database · checked Sep 20, 2026
6	Meritis	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	549 contacts →
	Indirect evidence “Meritis is a consulting firm specializing in the digital transformation of organizations, co-founded in 2007 by Sébastien Videment.” Source: RevenueBase Database · checked Sep 20, 2026
7	Ippon Technologies	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	510 contacts →
	Indirect evidence “USING OUR COLLECTIVE ENERGY FOR POSITIVE TECHNOLOGY Ippon is a consulting and expertise firm, who is convinced that technology is a source of progress for society.” Source: RevenueBase Database · checked Sep 20, 2026
8	Zenika	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	430 contacts →
	Indirect evidence “Zenika is an IT consulting firm with 550 employees that helps companies with their digital transformation.” Source: RevenueBase Database · checked Sep 20, 2026
9	LÙKLA	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	331 contacts →
	Indirect evidence “Together, aiming higher and going further to unlock your potential.” Source: RevenueBase Database · checked Sep 20, 2026
10	Cyllene	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	279 contacts →
	Indirect evidence “Chez Cyllene, on couvre le spectre complet de votre besoin en termes de : Conseils 🧬 Définition d’architectures Hébergement & Services managés Cybersécurité & Formations…” Source: RevenueBase Database · checked Sep 20, 2026
11	Theodo	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	236 contacts →
	Indirect evidence “A Theodo, toute notre énergie est tournée vers la satisfaction de nos clients.” Source: RevenueBase Database · checked Sep 20, 2026
12	Meltone Advisory	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	206 contacts →
	Indirect evidence “MeltOne is a consulting firm specialized in Organization and Solution Integration that helps companies and their employees in journey toward their transformation.” Source: RevenueBase Database · checked Sep 20, 2026
13	AS International Group	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	204 contacts →
	Indirect evidence “Société du groupe Neurones, AS International Group soutient les entreprises dans leur transformation digitale en proposant des solutions informatiques innovantes.” Source: RevenueBase Database · checked Sep 20, 2026
14	Syxperiane	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	183 contacts →
	Indirect evidence “Dans un monde qui change constamment, SYXPERIANE porte la mission de faire de chaque projet de transformation digitale, d’abord une transformation humaine.” Source: RevenueBase Database · checked Sep 20, 2026
15	Wemanity Reply Paris	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	178 contacts →
	Indirect evidence “Wemanity Reply is a consulting and delivery firm specialized in technological, organizational, and cultural transformation.” Source: RevenueBase Database · checked Sep 20, 2026
16	Norgay	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	167 contacts →
	Indirect evidence “NORGAY IT services, la proximité au cœur de votre transformation digitale NORGAY IT Services est une entreprise de services numériques (ESN), implantée sur Brest, Nantes, Paris…” Source: RevenueBase Database · checked Sep 20, 2026
17	Tesselate	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	158 contacts →
	Indirect evidence “We’re a Digital Transformation Consultancy and Integrator formed from the strategic merger of the French company, Efficiency Management Consulting, and the Belgian company, Raven…” Source: RevenueBase Database · checked Sep 20, 2026
18	HR Team Group	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	501-1,000	157 contacts →
	Indirect evidence “Since 2005, HR Team, Digital Services Company, has been ensuring a digital strategy in line with the ambition of its customers.” Source: RevenueBase Database · checked Sep 20, 2026
19	Saegus	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	134 contacts →
	Indirect evidence “Saegus: digital use at heart of the transformation of business models The creation of Saegus is a response to a persistent issue for clients: companies that are at a loss when…” Source: RevenueBase Database · checked Sep 20, 2026
20	ITEC	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	131 contacts →
	Indirect evidence “ITEC est une Entreprise de Services Numériques fondée en 2015 qui accompagne les organisations et les institutions dans leur quotidien et leurs transformations IT.” Source: RevenueBase Database · checked Sep 20, 2026
21	APSIA	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	124 contacts →
	Indirect evidence “Get a head start Apsia innove, conseille et construit pour vous donner un coup d'avance en toute responsabilité humaine.” Source: RevenueBase Database · checked Sep 20, 2026
22	Web-Atrio	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	111 contacts →
	Indirect evidence “Bienvenue chez WEB-ATRIO, l’#ESN qui change la donne!” Source: RevenueBase Database · checked Sep 20, 2026
23	Orness	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	106 contacts →
	Indirect evidence “ORNESS conseille et réalise les solutions IT permettant à ses clients de se transformer et d'innover.” Source: RevenueBase Database · checked Sep 20, 2026
24	Hello Pomelo	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	51-200	92 contacts →
	Indirect evidence “Depuis 2017, Hello Pomelo accompagne les ETI françaises dans leur transformation digitale.” Source: RevenueBase Database · checked Sep 20, 2026
25	Geci International	Indirect evidence	Paris, FranceHQ checked Sep 20, 2026	201-500	86 contacts →
	Indirect evidence “Smart Solutions for a Smart World” Le Groupe GECI International est spécialisé dans le Conseil en Technologies et dans la Transformation Digitale.” 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: legacy system modernization 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 legacy system modernization companies.
Partial evidence: Its own public description names part of legacy system modernization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization 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 542 legacy system modernization companies based in Paris, France

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Legacy system modernization companies based in Paris, France at a glance

As of Sep 20, 2026

41.9%Verified-email coverage

624.4Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Paris

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

274

11-50

171

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole France list rather than for Paris, so it is reported there. Company counts and contact totals on this page are exact for Paris, over 542 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 legacy system modernization 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 Paris, France whose own description of what they do matches “legacy system modernization 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 legacy system modernization 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 legacy system modernization companies, and records with no verified work email. Companies headquartered outside Paris 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, 141,675 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.

Legacy system modernization companies by metro in France

Legacy system modernization companies in Paris542
Legacy system modernization companies in Lyon63
Legacy system modernization companies in Lille32
Legacy system modernization companies in Toulouse31
Legacy system modernization companies in Courbevoie28
Legacy system modernization companies in Nantes28

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 legacy system modernization 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 legacy system modernization companies are there based in Paris, France?

RevenueBase identified 542 legacy system modernization companies headquartered in Paris, 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?

Capgemini, headquartered in Paris, tops this list with the largest team on record.

Which city has the most legacy system modernization companies?

Paris leads with 542 headquartered companies, followed by Lyon (63) and Lille (32).

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 141,675 verified decision-maker contacts tracked across these 542 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.