Company lists · Data refreshed September 2026

Top 25 IT security consulting firms based in France

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 1,013 companies tracked

RevenueBase identified 1,013 IT security consulting firms headquartered in France as of September 2026 and tracks 12,695 professional contacts across them, including 3,530 with verified work emails and 290 with mobile numbers. Paris is the largest hub.

This list covers IT security 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 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 Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

1,013Companies

12,695Contacts tracked

3,530Verified emails

290Mobile numbers

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The 25 largest IT security consulting firms based in France

Ranked by team size

Top 25 of 1,013 IT security consulting firms based in France, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names IT security consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	I-TracingIndirect evidence	Courbevoie, FranceHQ checked Sep 4, 2026	1,001-5,000	643
	“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: company website · checked Sep 4, 2026
2	Byblos GroupIndirect evidence	Lissieu, FranceHQ checked Sep 4, 2026	1,001-5,000	529
	“Byblos Group est un groupe indépendant spécialisé dans la protection des personnes, des biens et des données, avec une approche sur mesure, fondée sur l’excellence opérationnelle…” Source: company website · checked Sep 4, 2026
3	own.securityIndirect evidence	Paris, FranceHQ checked Sep 4, 2026	51-200	506
	“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: company website · checked Sep 4, 2026
4	SynetisPartial evidence	Paris, FranceHQ checked Sep 4, 2026	201-500	369
	“Founded in 2010, Synetis is the leading independent French consultancy firm specialising in information systems security (ISS).” Source: company website · checked Sep 4, 2026
5	Devoteam Cyber TrustIndirect evidence	Levallois-Perret, FranceHQ checked Sep 4, 2026	10001+	342
	“Devoteam Cyber Trust is the cybersecurity specialist arm of the Devoteam Group.” Source: company website · checked Sep 4, 2026
6	CylleneIndirect evidence	Paris, FranceHQ checked Sep 4, 2026	201-500	279
	“Chez Cyllene, on couvre le spectre complet de votre besoin en termes de : Conseils 🧬 Définition d’architectures Hébergement & Services managés Cybersécurité & Formations…” Source: company website · checked Sep 4, 2026
7	FormindIndirect evidence	Issy-Les-Moulineaux, FranceHQ checked Sep 4, 2026	201-500	252
	“Formind est un leader français indépendant, expert en cybersécurité.” Source: company website · checked Sep 4, 2026
8	IntrinsecPartial evidence	Courbevoie, FranceHQ checked Sep 4, 2026	201-500	247
	“Intrinsec is focused on Information Security.” Source: company website · checked Sep 4, 2026
9	ADNOVIndirect evidence	Venelles, FranceHQ checked Sep 4, 2026	201-500	139
	“ADNOV, filiale du groupe ADSN, acteur de renommée française à l'ancrage national, développe depuis plus de 40 ans une expertise reconnue dans la cybersécurité et la protection des…” Source: company website · checked Sep 4, 2026
10	ItrustIndirect evidence	Toulouse, FranceHQ checked Sep 4, 2026	51-200	126
	“Since January 2007, ITrust has been offering cybersecurity solutions and expertise in 6 different countries on the European market.” Source: company website · checked Sep 4, 2026
11	XMCOPartial evidence	Paris, FranceHQ checked Sep 4, 2026	51-200	112
	“Our services : Penetration tests and Security Audits, Gap Analysis and PCI DSS Certification, CERT-XMCO (vulnerability watch, Cyber Survellance/Threat Intelligence, Forensics).” Source: company website · checked Sep 4, 2026
12	EgeriePartial evidence	Toulon, FranceHQ checked Sep 4, 2026	51-200	110
	“At Egerie, we believe cybersecurity shouldn't be a constraint, it should be a true driver of sustainable performance.” Source: company website · checked Sep 4, 2026
13	SekeraIndirect evidence	Saint-quentin-en-yvelines, FranceHQ checked Sep 4, 2026	51-200	86
	“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: company website · checked Sep 4, 2026
14	IsitixIndirect evidence	Thorigne-Fouillard, France	n/a	83
	“Depuis 20 ans, Isitix accompagne vos projets informatiques et numériques.” Source: company website · checked Sep 4, 2026
15	KNSIndirect evidence	Lyon, FranceHQ checked Sep 4, 2026	11-50	82
	“Fondée à Lyon en 2002, KNS est une Entreprise de Service du Numérique qui intervient à tous les niveaux de la sécurisation des Systèmes d'Information en France et à l'étranger.” Source: company website · checked Sep 4, 2026
16	Hara ConsultingPartial evidence	Strasbourg, FranceHQ checked Sep 4, 2026	51-200	81
	“HARA Consulting est un groupe spécialisé dans la transformation numérique des entreprises par la mise en place d'outils IA, data et tech.+ 1⃣ 0⃣ 0⃣ Collaborateurs - Experts…” Source: company website · checked Sep 4, 2026
17	CS In CybersecurityIndirect evidence	Le Plessis-Robinson, FranceHQ checked Sep 4, 2026	51-200	75
	“Acteur majeur de la cybersécurité, CS Group s'appuie sur ses équipes sont composées d’experts pluridisciplinaires qui offrent à nos clients une vision claire et une capacité…” Source: company website · checked Sep 4, 2026
18	AduneoIndirect evidence	Malakoff, FranceHQ checked Sep 4, 2026	51-200	73
	“Aduneo vous accompagne à chaque étape pour protéger vos identités, sécuriser vos données et simplifier votre quotidien.” Source: company website · checked Sep 4, 2026
19	LEXFOPartial evidence	Paris, FranceHQ checked Sep 4, 2026	51-200	65
	“LEXFO is an offensive security firm that assesses and strengthens your systems with an expert, pragmatic, results-driven approach.” Source: company website · checked Sep 4, 2026
20	WakersIndirect evidence	Lille, FranceHQ checked Sep 4, 2026	11-50	60
	“Les WAKERS sont des consultant·e·s spécialisé·s dans la sécurité et l’adoption des solutions Cloud au service de ses clients.” Source: company website · checked Sep 4, 2026
21	Login SécuritéIndirect evidence	Saint-Cloud, FranceHQ checked Sep 4, 2026	51-200	60
	“LA SÉCURITÉ CRÉATRICE DE VALEUR POUR LES CLIENTS Login Sécurité accompagne les DSI dans la définition et la mise en œuvre de leur stratégie de Confiance Numérique.” Source: company website · checked Sep 4, 2026
22	FOKUSIndirect evidence	Lyon, FranceHQ checked Sep 4, 2026	51-200	60
	“FOKUS, où l’Humain et la Technologie se rencontrent.” Source: company website · checked Sep 4, 2026
23	Vona ConsultingIndirect evidence	Paris, FranceHQ checked Sep 4, 2026	51-200	57
	“VONA, cabinet de conseil indépendant en cybergouvernance et stratégie digitale accompagne les entreprises et les acteurs publics à sécuriser, piloter et valoriser leur…” Source: company website · checked Sep 4, 2026
24	ScassiPartial evidence	Paris / Toulouse / Madrid, FranceHQ checked Sep 4, 2026	51-200	57
	“Nos collaborateurs, experts dans les domaines de la security et la safety, interviennent depuis la réalisation des analyses de risque jusqu'à la recette sécurité du projet confié…” Source: company website · checked Sep 4, 2026
25	CyberliftIndirect evidence	Paris, FranceHQ checked Sep 4, 2026	51-200	55
	“Cyberlift, l'excellence et l'engagement, au service de votre cybersécurité.” Source: company website · checked Sep 4, 2026

Showing 25 of 1,013 IT security consulting firms based in France

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IT security consulting firms based in France at a glance

As of Sep 4, 2026

1-10Median size (employees)

ParisLargest hub · 286 HQs

290Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

711

11-50

230

51-200

201-500

1,001-5,000

10001+

Verified emails by last verification

0–30

31–60

235

61–90

1,931

90–180

1,354

180+

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 IT security consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in France whose own description of what they do matches “IT security consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among IT security 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 an evidence 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, 3,530 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 4, 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.

IT security consulting firms by metro

IT security consulting firms in Paris286
IT security consulting firms in Lyon36

Frequently asked

How many IT security consulting firms are there based in France?

RevenueBase identified 1,013 IT security 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?

I-Tracing, headquartered in Courbevoie, tops this list with the largest team on record.

Which city has the most IT security consulting firms?

Paris leads with 286 headquartered companies, followed by Lyon (36) and Toulouse (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 3,530 verified decision-maker contacts tracked across these 1,013 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 4, 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.