Company lists · Data refreshed September 2026

Top 25 Defense IT consulting firms based in France

Name: Defense IT consulting firms based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 973 companies tracked

RevenueBase identified 973 defense IT consulting firms headquartered in France as of September 2026 and tracks 23,573 professional contacts across them, including 8,539 with verified work emails. Paris is the largest hub.

This list covers defense IT consulting firms 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 28, 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 28, 2026 86% judged on-target in blind review

973Companies

23,573Contacts tracked

8,539Verified emails

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The 25 largest defense IT consulting firms based in France

Ranked by team size

Top 25 of 973 defense IT consulting firms based in France, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to defense IT consulting firms: 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	Groupe SII	Indirect evidence	Paris, FranceHQ checked Sep 28, 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 28, 2026
2	CS Group	Indirect evidence	Le Plessis Robinson, FranceHQ checked Sep 28, 2026	5,001-10,000	2,092 contacts →
	Indirect evidence “Expert des systèmes critiques Conception, réalisation, déploiement & maintenance de systèmes critiques, basés sur des solutions et des produits innovants, garantissant…” Source: RevenueBase Database · checked Sep 28, 2026
3	Viveris	Strong evidence	Boulogne-billancourt, FranceHQ checked Sep 28, 2026	1,001-5,000	833 contacts →
	Strong evidence “Viveris is a consulting and engineering company with two main activities - IT consulting.” Source: RevenueBase Database · checked Sep 28, 2026
4	I-Tracing	Indirect evidence	Courbevoie, FranceHQ checked Sep 28, 2026	1,001-5,000	639 contacts →
	Indirect evidence “I-TRACING, pure player and cybersecurity service provider leader in France, supports over 600 clients around the world in managing their cyber risks, from anticipating threats to…” Source: RevenueBase Database · checked Sep 28, 2026
5	Klanik	Strong evidence	Marseille, FranceHQ checked Sep 28, 2026	501-1,000	585 contacts →
	Strong evidence “KLANIK is a consulting company specialized in IT Engineering which accompanies its partners in their digital and technological projects.” Source: RevenueBase Database · checked Sep 28, 2026
6	Tenexa	Partial evidence	Roissy Cdg Cedex, FranceHQ checked Sep 28, 2026	1,001-5,000	551 contacts →
	Partial evidence “Fondée en 1985, Tenexa est une Entreprise de services du numérique (ESN), Le groupe Tenexa est composé de deux filiales (Infodis IT, & Prolival) et se positionne résolument vers…” Source: RevenueBase Database · checked Sep 28, 2026
7	DCS Easyware	Partial evidence	Lyon, FranceHQ checked Sep 28, 2026	1,001-5,000	532 contacts →
	Partial evidence “Filiale du Groupe SYNERGIE, DCS SYNERGIE GROUP capitalise sur son histoire pour accompagner chaque jour les enjeux IT de ses clients.” Source: RevenueBase Database · checked Sep 28, 2026
8	own.security	Indirect evidence	Paris, FranceHQ checked Sep 28, 2026	51-200	506 contacts →
	Indirect evidence “Founded in 2008, OWN is a Pure Player in cybersecurity, with offices in Paris, Rennes and Toulouse, but with a presence throughout France with its fully remote employees.” Source: RevenueBase Database · checked Sep 28, 2026
9	Metsys	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 28, 2026	501-1,000	397 contacts →
	Indirect evidence “Metsys est un intégrateur de solutions de cybersécurité, d’infrastructure et de cloud.” Source: RevenueBase Database · checked Sep 28, 2026
10	Objectware	Strong evidence	Paris, FranceHQ checked Sep 28, 2026	501-1,000	395 contacts →
	Strong evidence “Objectware Group is an IT Services Company (or ESN: Entreprise de Services du Numérique), founded in and dedicated to consulting and IT system engineering.” Source: RevenueBase Database · checked Sep 28, 2026
11	Devoteam Microsoft Partner	Partial evidence	Levallois Perret, FranceHQ checked Sep 28, 2026	1,001-5,000	325 contacts →
	Partial evidence “Devoteam is a leading provider of Premium Microsoft Cloud Consulting and Managed services in EMEA.” Source: RevenueBase Database · checked Sep 28, 2026
12	Cyllene	Indirect evidence	Paris, FranceHQ checked Sep 28, 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 28, 2026
13	Airbus Defence And Space Cyber	Partial evidence	Elancourt, FranceHQ checked Sep 28, 2026	501-1,000	225 contacts →
	Partial evidence “The Cyber business of Airbus Defence and Space is a European specialist in cyber security for defence and aerospace systems and assets.” Source: RevenueBase Database · checked Sep 28, 2026
14	Stanley Security France	Indirect evidence	Ivry-sur-seine, FranceHQ checked Sep 28, 2026	1,001-5,000	191 contacts →
	Indirect evidence “STANLEY Security est devenu Securitas Technology en 2022.” Source: RevenueBase Database · checked Sep 28, 2026
15	MARGO	Strong evidence	Paris, FranceHQ checked Sep 28, 2026	201-500	174 contacts →
	Strong evidence “More than a simple IT consulting group, MARGO is an alchemy of talents with constantly enriched expertise, always encouraged to be dynamic and to flourish.” Source: RevenueBase Database · checked Sep 28, 2026
16	Acelys Services Numériques	Indirect evidence	Montpellier, FranceHQ checked Sep 28, 2026	51-200	169 contacts →
	Indirect evidence “Créée en 1997, Acelys Services Numériques est une entreprise de services numériques (ESN) basée en Occitanie.” Source: RevenueBase Database · checked Sep 28, 2026
17	Norgay	Partial evidence	Paris, FranceHQ checked Sep 28, 2026	201-500	167 contacts →
	Partial 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 28, 2026
18	Labsoft	Indirect evidence	Labège, FranceHQ checked Sep 28, 2026	51-200	132 contacts →
	Indirect evidence “Labsoft SSII accompagne des grands comptes régionaux et national ainsi que des PME PMI.” Source: RevenueBase Database · checked Sep 28, 2026
19	Abicom	Indirect evidence	Aubiere, FranceHQ checked Sep 28, 2026	51-200	122 contacts →
	Indirect evidence “Avec plus de 155 experts, Abicom Groupe OCI est le partenaire informatique de tous les professionnels.” Source: RevenueBase Database · checked Sep 28, 2026
20	Evabssi	Partial evidence	Paris, FranceHQ checked Sep 28, 2026	201-500	117 contacts →
	Partial evidence “EvaBssi is an international consulting firm specialized in cybersecurity and IS performance.” Source: RevenueBase Database · checked Sep 28, 2026
21	Team-It	Indirect evidence	Aix-en-provence, FranceHQ checked Sep 28, 2026	51-200	115 contacts →
	Indirect evidence “Mais qui sommes-nous?” Source: RevenueBase Database · checked Sep 28, 2026
22	ENGIT	Partial evidence	Valbonne, FranceHQ checked Sep 28, 2026	51-200	102 contacts →
	Partial evidence “engIT \| Innovation IT & Transformation digitale - Faire du conseil différemment Depuis 2017, engIT accompagne les entreprises dans leurs projets stratégiques d'innovation…” Source: RevenueBase Database · checked Sep 28, 2026
23	Aramys	Indirect evidence	Lens, FranceHQ checked Sep 28, 2026	51-200	96 contacts →
	Indirect evidence “ARAMYS est une société de Conseil et d'Expertise intervenant sur l'ensemble des problématiques des PME/PMI et Grands Comptes liées aux Systèmes d'Information et de Communication…” Source: RevenueBase Database · checked Sep 28, 2026
24	Sekera	Indirect evidence	Saint-quentin-en-yvelines, FranceHQ checked Sep 28, 2026	51-200	88 contacts →
	Indirect evidence “Sekera Services est un cabinet de conseil homologué par la DGSSI comme prestataire d’audit de sécurité SI (PASSI) répondant aux exigences en termes de démarche et qualifications…” Source: RevenueBase Database · checked Sep 28, 2026
25	Geci International	Indirect evidence	Paris, FranceHQ checked Sep 28, 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 28, 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: defense IT consulting firms. 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 defense IT consulting firms.
Partial evidence: Its own public description names part of defense IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name defense IT consulting firms. 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 973 defense IT consulting firms based in France

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Defense IT consulting firms based in France at a glance

As of Sep 28, 2026

36.2%Verified-email coverage

24.2Average contacts per company

1-10Median size (employees)

25.5%Largest-city concentration · Paris

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

580

11-50

277

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 973 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 defense IT consulting firms, 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 “defense IT consulting firms”. 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 defense IT consulting firms), 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 defense IT consulting firms, 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, 8,539 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 28, 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.

Defense IT consulting firms by metro

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 defense IT consulting firms, 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 defense IT consulting firms are there based in France?

RevenueBase identified 973 defense IT consulting firms 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?

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

Which city has the most defense IT consulting firms?

Paris leads with 248 headquartered companies, followed by Lyon (34) and Boulogne-Billancourt (15).

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 8,539 verified decision-maker contacts tracked across these 973 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 28, 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.