Company lists · Data verified August 2026

Top 25 Cybersecurity consulting agencies based in France

Name: Cybersecurity consulting agencies based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 1,140 companies tracked

There are 1,140 cybersecurity consulting agencies headquartered in France (RevenueBase, August 2026). RevenueBase tracks 14,299 professional contacts across them, including 4,239 with verified work emails and 354 with mobile numbers. Paris is the largest hub.

This list covers cybersecurity consulting agencies headquartered in France, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

1,140Companies

14,299Contacts tracked

4,239Verified emails

354Mobile numbers

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The 25 largest cybersecurity consulting agencies based in France

Ranked by team size

Top 25 of 1,140 cybersecurity consulting agencies based in France, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	I-Tracing	Courbevoie	1,001-5,000	643	394
2	Byblos Group	Lissieu	1,001-5,000	529	34
3	own.security	Rennes	51-200	506	26
4	Metsys	Lille	501-1,000	408	246
5	Synetis	Cesson-Sevigne	201-500	369	209
6	Devoteam Cyber Trust	Levallois-Perret	10001+	342	145
7	Cyllene	Nanterre	201-500	279	206
8	Formind	Issy-Les-Moulineaux	201-500	252	136
9	Intrinsec	Courbevoie	201-500	247	140
10	Airbus Defence And Space Cyber	Elancourt	501-1,000	223	133
11	Synacktiv	Toulouse	51-200	170	125
12	ADNOV	n/a	201-500	139	67
13	Itrust	Toulouse	51-200	126	76
14	Alleo DE Bouygues Telecom	Dardilly	51-200	119	42
15	XMCO	Labege	51-200	112	4
16	Egerie	Paris	51-200	110	50
17	Quarkslab	Paris	51-200	94	45
18	Exclusive Networks France	Boulogne Billancourt	51-200	93	62
19	Sekera	Saint-Quentin-En-Yvelines	51-200	86	28
20	Magellan Sécurité	Romilly-Sur-Seine	51-200	76	33
21	CS In Cybersecurity	Le Plessis-Robinson	51-200	75	20
22	Celios	Bordeaux	51-200	73	48
23	Aduneo	Malakoff	51-200	73	36
24	Login Sécurité	Saint-Cloud	51-200	60	28
25	FOKUS	Lyon	51-200	60	12

Showing 25 of 1,140 cybersecurity consulting agencies based in France

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Cybersecurity consulting agencies based in France at a glance

As of Aug 28, 2026

1-10Median size (employees)

ParisLargest hub · 327 HQs

354Contacts with mobile numbers

6Emails re-verified in last 30 days

Companies by employee count

1-10

797

11-50

256

51-200

201-500

501-1,000

1,001-5,000

10001+

Cybersecurity consulting agencies by metro

Metro	Companies
Cybersecurity consulting agencies in Paris	327
Cybersecurity consulting agencies in Lyon	36
Cybersecurity consulting agencies in Toulouse	21
Cybersecurity consulting agencies in Lille	16
Cybersecurity consulting agencies in Rennes	15
Cybersecurity consulting agencies in Boulogne-Billancourt	14
Cybersecurity consulting agencies in Puteaux	14

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cybersecurity consulting agencies”, with match quality audited by blind human judging, and headquartered in France.
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: Contact records re-verify on a rolling cadence; 6 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cybersecurity consulting agencies are there based in France?

There are 1,140 cybersecurity consulting agencies headquartered in France as of August 2026 (RevenueBase).

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 cybersecurity consulting agencies?

Paris leads with 327 headquartered companies, followed by Lyon (36) and Toulouse (21).

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 4,239 verified decision-maker contacts tracked across these 1,140 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.