Company lists · Data refreshed September 2026

Top 25 IT security consulting firms based in Belgium

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, 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 HQ checked on every row Match evidence 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. 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.
#CompanyHeadquartersEmployeesContacts
1
Approach CyberIndirect evidence
Mont-saint-guibert, BelgiumHQ checked Sep 4, 202651-20093

“Approach Cyber is a trusted cyber resilience partner supporting organizations across Belgium and Switzerland.”

Source: company website · checked Sep 4, 2026
2
SpotitPartial evidence
Merelbeke, BelgiumHQ checked Sep 4, 202651-20089

“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: company website · checked Sep 4, 2026
3
ToreonPartial evidence
Antwerpen, BelgiumHQ checked Sep 4, 202651-20067

“At Toreon, we believe that security is vital for people to live and work confidently, with trust in our digital society.”

Source: company website · checked Sep 4, 2026
4
ACENIndirect evidence
Kontich, BelgiumHQ checked Sep 4, 202651-20050

“Tailored, end-to-end solutions, suited to your cybersecurity needs.”

Source: company website · checked Sep 4, 2026
5
SecwisePartial evidence
Leuven, BelgiumHQ checked Sep 4, 202611-5029

“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: company website · checked Sep 4, 2026
6
The Collective ConsultingPartial evidence
Lochristi, BelgiumHQ checked Sep 4, 202611-5028

“The Collective is a highly-skilled and accredited Microsoft Partner with expertise in security, compliance, endpoint management, and cloud infrastructure.”

Source: company website · checked Sep 4, 2026
7
SertalinkIndirect evidence
St-niklaas, BelgiumHQ checked Sep 4, 202611-5027

“Sertalink is a premier cybersecurity expert in Belgium and Luxembourg, serving as your organization's vigilant guardian in the digital world.”

Source: company website · checked Sep 4, 2026
8
Upright SecurityIndirect evidence
Kontich, BelgiumHQ checked Sep 4, 202611-5021

“As a strategic partner of Okta, SailPoint, Wiz, and Netskope, we deliver end-to-end cybersecurity across identity, cloud, and data.”

Source: company website · checked Sep 4, 2026
9
Resilient SecurityPartial evidence
Antwerp, BelgiumHQ checked Sep 4, 202611-5020

“Resilient Security is your trusted partner in cybersecurity, bridging the gap between big consultancy firms and system integrators.”

Source: company website · checked Sep 4, 2026
10BelgiumHQ checked Sep 4, 202611-5020

“At Thales Cyber Solutions Belgium, we strive for security & privacy.”

Source: company website · checked Sep 4, 2026
11
The Security FactoryPartial evidence
Niel, BelgiumHQ checked Sep 4, 202611-5019

“The main goal of the Security Factory is to test/assess the current security maturity level of clients.”

Source: company website · checked Sep 4, 2026
12
ActwisePartial evidence
Kontich, BelgiumHQ checked Sep 4, 202611-5018

“ActWise is the partner of choice for securing your identities and protecting what matters most within your company.”

Source: company website · checked Sep 4, 2026
13
RedsystemIndirect evidence
Froyennes, BelgiumHQ checked Sep 4, 202611-5018

“Our mission is to advise and support you in minimizing the attack surface that could threaten your business.”

Source: company website · checked Sep 4, 2026
14
PreteraPartial evidence
Prishtinë, BelgiumHQ checked Sep 4, 202611-5018

“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: company website · checked Sep 4, 2026
15
RST ConsultancyPartial evidence
Turnhout, BelgiumHQ checked Sep 4, 202611-5017

“RST consultancy guides your company to the desired level of security.”

Source: company website · checked Sep 4, 2026
16
MCGIndirect evidence
Ottignies-Louvain-La-Neuve, BelgiumHQ checked Sep 4, 20261-1016

“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: company website · checked Sep 4, 2026
17
Cobra-TechnologyIndirect evidence
Erpe-Mere, BelgiumHQ checked Sep 4, 202611-5012

“Uw beveiligingsfirma in Oost-Vlaanderen ACTIEF IN 5 DOMEINEN In 2007 richtte Hans Rottiers de beveiligingsfirma Cobra Technology op.”

Source: company website · checked Sep 4, 2026
18
Easi NetworkIndirect evidence
Vise, BelgiumHQ checked Sep 4, 20261-1011

“EASI Network : Société de services et de conseils active dans les réseaux informatiques, IoT et télécoms à destination des entreprises et des institutions.”

Source: company website · checked Sep 4, 2026
19Ixelles, BelgiumHQ checked Sep 4, 202611-5011

“A&P offers consulting expertise in data protection, cybersecurity and IT & Digital governance”

Source: company website · checked Sep 4, 2026
20
SplynterIndirect evidence
Kontich, BelgiumHQ checked Sep 4, 20261-1010

“At Splynter we want to help companies understand their adversaries and how to combat them.”

Source: company website · checked Sep 4, 2026
21
CuriosIndirect evidence
BelgiumHQ checked Sep 4, 20261-1010

“Curiosity is a powerful force.”

Source: company website · checked Sep 4, 2026
22
NetcureIndirect evidence
Zaventem, BelgiumHQ checked Sep 4, 20261-109

“In a world where everything is connected and people are online all the time, data and resources are distributed and mobile.”

Source: company website · checked Sep 4, 2026
23
Brand Solutions EuropePartial evidence
Sint-niklaas, BelgiumHQ checked Sep 4, 20261-108

“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: company website · checked Sep 4, 2026
24
CTI ConsultingPartial evidence
BelgiumHQ checked Sep 4, 20261-108

“Our services: • Digital transformation: Strategy, needs analysis, diagnostics, project management, IT governance, etc.”

Source: company website · checked Sep 4, 2026
25
4netIndirect evidence
Mechelen, BelgiumHQ checked Sep 4, 202611-507

“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: company website · checked Sep 4, 2026

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
1-10Median size (employees)
BrusselsLargest hub · 24 HQs
98Contacts with mobile numbers
Sep 4, 2026Data refreshed

Companies by employee count

1-10
205
11-50
43
51-200
6
201-500
3
1,001-5,000
2

Verified emails by last verification

0–30
0
31–60
168
61–90
1,443
90–180
997
180+
14

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 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.
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 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, 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

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 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.