Company lists · Data refreshed September 2026

Top 25 IT security consulting firms based in Belgium

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 262 companies tracked

RevenueBase identified 262 IT security consulting firms headquartered in Belgium as of September 2026 and tracks 5,005 professional contacts across them, including 2,622 with verified work emails and 98 with mobile numbers. Brussels is the largest hub.

This list covers IT security consulting firms headquartered in Belgium, 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 4, 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 4, 2026 86% judged on-target in blind review

262Companies

5,005Contacts tracked

2,622Verified emails

98Mobile numbers

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The 25 largest IT security consulting firms based in Belgium

Ranked by team size

Top 25 of 262 IT security consulting firms based in Belgium, ranked by team size, largest first. Data refreshed Sep 4, 2026. RevenueBase Smart Search rates how each company's information relates to IT security 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	Approach Cyber	Indirect evidence	Mont-saint-guibert, BelgiumHQ checked Sep 4, 2026	51-200	93 contacts →
	Indirect evidence “Approach Cyber is a trusted cyber resilience partner supporting organizations across Belgium and Switzerland.” Source: RevenueBase Database · checked Sep 4, 2026
2	Spotit	Partial evidence	Merelbeke, BelgiumHQ checked Sep 4, 2026	51-200	89 contacts →
	Partial evidence “Spotit is the trusted advisor for its customers and collaborates with them on innovative security & networking architectures that bring a big strategic advantage and insight.” Source: RevenueBase Database · checked Sep 4, 2026
3	Toreon	Partial evidence	Antwerpen, BelgiumHQ checked Sep 4, 2026	51-200	67 contacts →
	Partial evidence “At Toreon, we believe that security is vital for people to live and work confidently, with trust in our digital society.” Source: RevenueBase Database · checked Sep 4, 2026
4	ACEN	Indirect evidence	Kontich, BelgiumHQ checked Sep 4, 2026	51-200	50 contacts →
	Indirect evidence “Tailored, end-to-end solutions, suited to your cybersecurity needs.” Source: RevenueBase Database · checked Sep 4, 2026
5	Secwise	Partial evidence	Leuven, BelgiumHQ checked Sep 4, 2026	11-50	29 contacts →
	Partial evidence “As Belgium’s largest Microsoft Security team and #1 Microsoft Gold Security Partner of the BeLux, we provide you a solid end-to-end security strategy to protect your organization…” Source: RevenueBase Database · checked Sep 4, 2026
6	The Collective Consulting	Partial evidence	Lochristi, BelgiumHQ checked Sep 4, 2026	11-50	28 contacts →
	Partial evidence “The Collective is a highly-skilled and accredited Microsoft Partner with expertise in security, compliance, endpoint management, and cloud infrastructure.” Source: RevenueBase Database · checked Sep 4, 2026
7	Sertalink	Indirect evidence	St-niklaas, BelgiumHQ checked Sep 4, 2026	11-50	27 contacts →
	Indirect evidence “Sertalink is a premier cybersecurity expert in Belgium and Luxembourg, serving as your organization's vigilant guardian in the digital world.” Source: RevenueBase Database · checked Sep 4, 2026
8	Upright Security	Indirect evidence	Kontich, BelgiumHQ checked Sep 4, 2026	11-50	21 contacts →
	Indirect evidence “As a strategic partner of Okta, SailPoint, Wiz, and Netskope, we deliver end-to-end cybersecurity across identity, cloud, and data.” Source: RevenueBase Database · checked Sep 4, 2026
9	Resilient Security	Partial evidence	Antwerp, BelgiumHQ checked Sep 4, 2026	11-50	20 contacts →
	Partial evidence “Resilient Security is your trusted partner in cybersecurity, bridging the gap between big consultancy firms and system integrators.” Source: RevenueBase Database · checked Sep 4, 2026
10	Thales Cyber Solutions Belgium	Partial evidence	BelgiumHQ checked Sep 4, 2026	11-50	20 contacts →
	Partial evidence “At Thales Cyber Solutions Belgium, we strive for security & privacy.” Source: RevenueBase Database · checked Sep 4, 2026
11	The Security Factory	Partial evidence	Niel, BelgiumHQ checked Sep 4, 2026	11-50	19 contacts →
	Partial evidence “The main goal of the Security Factory is to test/assess the current security maturity level of clients.” Source: RevenueBase Database · checked Sep 4, 2026
12	Actwise	Partial evidence	Kontich, BelgiumHQ checked Sep 4, 2026	11-50	18 contacts →
	Partial evidence “ActWise is the partner of choice for securing your identities and protecting what matters most within your company.” Source: RevenueBase Database · checked Sep 4, 2026
13	Redsystem	Indirect evidence	Froyennes, BelgiumHQ checked Sep 4, 2026	11-50	18 contacts →
	Indirect evidence “Our mission is to advise and support you in minimizing the attack surface that could threaten your business.” Source: RevenueBase Database · checked Sep 4, 2026
14	Pretera	Partial evidence	Prishtinë, BelgiumHQ checked Sep 4, 2026	11-50	18 contacts →
	Partial evidence “Pretera is an offensive security company offering a wide range of services such as network and application penetration testing, social engineering, and red teaming.” Source: RevenueBase Database · checked Sep 4, 2026
15	RST Consultancy	Partial evidence	Turnhout, BelgiumHQ checked Sep 4, 2026	11-50	17 contacts →
	Partial evidence “RST consultancy guides your company to the desired level of security.” Source: RevenueBase Database · checked Sep 4, 2026
16	MCG	Indirect evidence	Ottignies-Louvain-La-Neuve, BelgiumHQ checked Sep 4, 2026	1-10	16 contacts →
	Indirect evidence “Notre collaboration vous permet de vous défendre face aux diverses cyberattaques complexes et structurées pour protéger vos actifs, hébergés en interne ou dans le Cloud, et ainsi…” Source: RevenueBase Database · checked Sep 4, 2026
17	Cobra-Technology	Indirect evidence	Erpe-Mere, BelgiumHQ checked Sep 4, 2026	11-50	12 contacts →
	Indirect evidence “Uw beveiligingsfirma in Oost-Vlaanderen ACTIEF IN 5 DOMEINEN In 2007 richtte Hans Rottiers de beveiligingsfirma Cobra Technology op.” Source: RevenueBase Database · checked Sep 4, 2026
18	Easi Network	Indirect evidence	Vise, BelgiumHQ checked Sep 4, 2026	1-10	11 contacts →
	Indirect evidence “EASI Network : Société de services et de conseils active dans les réseaux informatiques, IoT et télécoms à destination des entreprises et des institutions.” Source: RevenueBase Database · checked Sep 4, 2026
19	Ataya And Partners - HTP Group	Strong evidence	Ixelles, BelgiumHQ checked Sep 4, 2026	11-50	11 contacts →
	Strong evidence “A&P offers consulting expertise in data protection, cybersecurity and IT & Digital governance” Source: RevenueBase Database · checked Sep 4, 2026
20	Splynter	Indirect evidence	Kontich, BelgiumHQ checked Sep 4, 2026	1-10	10 contacts →
	Indirect evidence “At Splynter we want to help companies understand their adversaries and how to combat them.” Source: RevenueBase Database · checked Sep 4, 2026
21	Curios	Indirect evidence	BelgiumHQ checked Sep 4, 2026	1-10	10 contacts →
	Indirect evidence “Curiosity is a powerful force.” Source: RevenueBase Database · checked Sep 4, 2026
22	Netcure	Indirect evidence	Zaventem, BelgiumHQ checked Sep 4, 2026	1-10	9 contacts →
	Indirect evidence “In a world where everything is connected and people are online all the time, data and resources are distributed and mobile.” Source: RevenueBase Database · checked Sep 4, 2026
23	Brand Solutions Europe	Partial evidence	Sint-niklaas, BelgiumHQ checked Sep 4, 2026	1-10	8 contacts →
	Partial evidence “Cybersecurity \| Algemene IT-diensten \| Digitale media Het digitale tijdperk heeft een enorme stroomversnelling gekend afgelopen jaren, dit is een trend die alleen nog maar zal…” Source: RevenueBase Database · checked Sep 4, 2026
24	CTI Consulting	Partial evidence	BelgiumHQ checked Sep 4, 2026	1-10	8 contacts →
	Partial evidence “Our services: • Digital transformation: Strategy, needs analysis, diagnostics, project management, IT governance, etc.” Source: RevenueBase Database · checked Sep 4, 2026
25	4net	Indirect evidence	Mechelen, BelgiumHQ checked Sep 4, 2026	11-50	7 contacts →
	Indirect evidence “The philosophy underlying our approach is one of open-mindedness and flexibility, whereby we do not restrict ourselves to any particular vendor or product, but instead remain…” Source: RevenueBase Database · checked Sep 4, 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: IT security 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 IT security consulting firms.
Partial evidence: Its own public description names part of IT security consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT security 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 262 IT security consulting firms based in Belgium

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IT security consulting firms based in Belgium at a glance

As of Sep 4, 2026

52.4%Verified-email coverage

2.0%Mobile-number coverage

19.1Average contacts per company

1-10Median size (employees)

9.2%Largest-city concentration · Brussels

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

205

11-50

51-200

201-500

1,001-5,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

00–30

16831–60

1,44361–90

99790–180

14180+

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 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 Belgium 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.
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 IT security 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 IT security consulting firms, and records with no verified work email. Companies headquartered outside Belgium 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, 2,622 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.

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 IT security 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 IT security consulting firms are there based in Belgium?

RevenueBase identified 262 IT security consulting firms headquartered in Belgium 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?

Approach Cyber, headquartered in Mechelen, tops this list with the largest team on record.

Which city has the most IT security consulting firms?

Brussels leads with 24 headquartered companies, followed by Antwerp (10) and Antwerpen (8).

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 2,622 verified decision-maker contacts tracked across these 262 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 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.