Company lists · Data refreshed September 2026

Top 25 Cybersecurity and defense software companies based in France

Name: Cybersecurity and defense software companies based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 223 companies tracked

RevenueBase identified 223 cybersecurity and defense software companies headquartered in France as of September 2026 and tracks 54,782 professional contacts across them, including 21,277 with verified work emails and 2,247 with mobile numbers. Paris is the largest hub.

This list covers cybersecurity and defense software 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 1, 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 RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

223Companies

54,782Contacts tracked

21,277Verified emails

2,247Mobile numbers

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The 25 largest cybersecurity and defense software companies based in France

Ranked by team size

Top 25 of 223 cybersecurity and defense software companies based in France, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity and defense software 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	Thales	Partial evidence	Meudon, France	10001+	51,367 contacts →
	Partial evidence “Thales (Euronext Paris: HO) is a global leader in advanced technologies for the Defence, Aerospace, and Cyber & Digital sectors.” Source: RevenueBase Database · checked Sep 1, 2026
2	own.security	Partial evidence	Rennes, France	51-200	506 contacts →
	Partial 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 1, 2026
3	Airbus Defence And Space Cyber	Partial evidence	Elancourt, France	501-1,000	223 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 1, 2026
4	Itrust	Partial evidence	Toulouse, France	51-200	126 contacts →
	Partial evidence “Since January 2007, ITrust has been offering cybersecurity solutions and expertise in 6 different countries on the European market.” Source: RevenueBase Database · checked Sep 1, 2026
5	Quarkslab	Indirect evidence	Paris, France	51-200	94 contacts →
	Indirect evidence “Fondée en 2011 par Fred Raynal, Quarkslab est une entreprise française spécialisée dans la cybersécurité et plus spécifiquement dans la protection et l'analyse des logiciels.” Source: RevenueBase Database · checked Sep 1, 2026
6	CS In Cybersecurity	Indirect evidence	Le Plessis-Robinson, France	51-200	75 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 1, 2026
7	Eset France	Indirect evidence	Marne-La-Vallee, France	51-200	71 contacts →
	Indirect evidence “Depuis plus de 30 ans, nous sommes là pour veiller à la protection du progrès et de l'innovation.” Source: RevenueBase Database · checked Sep 1, 2026
8	Amossys Groupe Almond	Indirect evidence	Rennes, France	201-500	57 contacts →
	Indirect evidence “Toute l’expertise cyber, une seule marque : AMOSSYS devient ALMOND.” Source: RevenueBase Database · checked Sep 1, 2026
9	Omnitech Security	Indirect evidence	France	51-200	55 contacts →
	Indirect evidence “Depuis 2005, OMNITECH SECURYTY propose son expertise dans la sûreté et la Cyber-sécurité sur toute la France.” Source: RevenueBase Database · checked Sep 1, 2026
10	Sealsq	Indirect evidence	Meyreuil, France	51-200	53 contacts →
	Indirect evidence “SEALSQ develops sovereign semiconductor security technologies designed to protect connected devices, communications, and digital infrastructure in the AI and quantum era.” Source: RevenueBase Database · checked Sep 1, 2026
11	Sysdream	Indirect evidence	Levallois-Perret, France	51-200	53 contacts →
	Indirect evidence “À propos de SYSDREAM : Fondée il y a plus de 20 ans, Sysdream, filiale Cybersécurité du Groupe Hub One, propose aux comptes publics et privés une offre globale de solutions…” Source: RevenueBase Database · checked Sep 1, 2026
12	Vistory	Strong evidence	Velizy-Villacoublay, France	11-50	43 contacts →
	Strong evidence “Founded in 2015, Vistory is a software editor specialized in cybersecurity and digital trust.” Source: RevenueBase Database · checked Sep 1, 2026
13	CYSEC	Partial evidence	Toulouse, France	11-50	39 contacts →
	Partial evidence “CYSEC is a European cybersecurity company based in Luxembourg with additional locations in Switzerland and France.” Source: RevenueBase Database · checked Sep 1, 2026
14	ERIUM	Partial evidence	France	51-200	38 contacts →
	Partial evidence “To be confident in your cyber defences, every person and technology must be confronted by reality.” Source: RevenueBase Database · checked Sep 1, 2026
15	Kytl Security	Indirect evidence	Paris, France	11-50	34 contacts →
	Indirect evidence “KYTL \| Spécialiste de la protection des données et des environnements critiques; Fondée par des experts en cybersécurité cumulant plus de 15 ans d’expérience, KYTL accompagne les…” Source: RevenueBase Database · checked Sep 1, 2026
16	Bsecure	Indirect evidence	Paris, France	51-200	33 contacts →
	Indirect evidence “Bsecure est un cabinet d'expertise en cybersécurité 100% français, fondé en 2009, et détenu en fonds propres par ses dirigeants.” Source: RevenueBase Database · checked Sep 1, 2026
17	Randorisec	Partial evidence	Paris, France	11-50	31 contacts →
	Partial evidence “Cybersecurity company founded by security experts providing the following services: Security audits, Vulnerability research, SecOps, SecArch and Trainings” Source: RevenueBase Database · checked Sep 1, 2026
18	Five Nines	Indirect evidence	Paris, France	11-50	26 contacts →
	Indirect evidence “Five Nines est née en 2019 d’un constat simple, celui d’un manque crucial de compétences et d’expérience dans la sécurisation de la transformation digitale des entreprises.” Source: RevenueBase Database · checked Sep 1, 2026
19	Sophos France	Indirect evidence	Bezons, France	51-200	24 contacts →
	Indirect evidence “Plus de 100 millions d’utilisateurs dans 150 pays ont retenu Sophos comme la meilleure défense du marché contre les menaces complexes et les risques de pertes de données.” Source: RevenueBase Database · checked Sep 1, 2026
20	Seclab	Indirect evidence	Perols, France	11-50	22 contacts →
	Indirect evidence “As France's leading provider of cyber protection for critical systems, Seclab secures exchanges by simplifying interconnection architectures and eliminating the risks associated…” Source: RevenueBase Database · checked Sep 1, 2026
21	Kyron Solutions Informatiques	Indirect evidence	Toulouse, France	11-50	22 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 1, 2026
22	Sylink Technologie	Partial evidence	Saint-Jacques-De-La-Lande, France	201-500	21 contacts →
	Partial evidence “SYLink Technologie is an innovative player in the field of cybersecurity, dedicated to protecting networks, connected devices, and sensitive company data.” Source: RevenueBase Database · checked Sep 1, 2026
23	Ého.Link	Indirect evidence	France	11-50	16 contacts →
	Indirect evidence “ÉHO.LINK est une équipe de 25 personnes ancrée à Marseille.” Source: RevenueBase Database · checked Sep 1, 2026
24	Diateam	Indirect evidence	Brest, France	11-50	16 contacts →
	Indirect evidence “Founded in 2002, on the French MoD needs, DIATEAM is a R&D company specializing in computer security.” Source: RevenueBase Database · checked Sep 1, 2026
25	u.neat	Indirect evidence	France	11-50	15 contacts →
	Indirect evidence “Nous veillons sur la sécurité de votre Système d’Information.” Source: RevenueBase Database · checked Sep 1, 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: cybersecurity and defense software 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 cybersecurity and defense software companies.
Partial evidence: Its own public description names part of cybersecurity and defense software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity and defense software 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 223 cybersecurity and defense software companies based in France

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Cybersecurity and defense software companies based in France at a glance

As of Sep 1, 2026

38.8%Verified-email coverage

4.1%Mobile-number coverage

245.7Average contacts per company

1-10Median size (employees)

26.0%Largest-city concentration · Paris

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

134

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

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 cybersecurity and defense software 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 “cybersecurity and defense software 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 cybersecurity and defense software 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 cybersecurity and defense software 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, 21,277 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 1, 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.

Cybersecurity and defense software companies by metro

Cybersecurity and defense software companies in Paris58

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 cybersecurity and defense software 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 cybersecurity and defense software companies are there based in France?

RevenueBase identified 223 cybersecurity and defense software 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?

Thales, headquartered in Meudon, tops this list with the largest team on record.

Which city has the most cybersecurity and defense software companies?

Paris leads with 58 headquartered companies, followed by Lyon (12) and Toulouse (7).

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 21,277 verified decision-maker contacts tracked across these 223 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 1, 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.