Company lists · Data refreshed September 2026

Top 25 Managed security service providers based in Belgium

RevenueBase identified 170 managed security service providers headquartered in Belgium as of September 2026 and tracks 1,248 professional contacts across them, including 549 with verified work emails and 26 with mobile numbers. Brussels is the largest hub.

This list covers managed security service providers 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 5, 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 5, 2026 86% judged on-target in blind review
170Companies
1,248Contacts tracked
549Verified emails
26Mobile numbers
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The 25 largest managed security service providers based in Belgium

Ranked by team size
Top 25 of 170 managed security service providers based in Belgium, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed security service providers: 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
Nviso SecurityStrong evidence
Brussels, BelgiumHQ checked Sep 5, 2026201-500315

“NVISO is a cyber security services firm composed of outstanding security professionals - each has a specific field of expertise, ranging from security research and risk management…”

Source: company website · checked Sep 5, 2026
2
SecutecIndirect evidence
Aartselaar, BelgiumHQ checked Sep 5, 202651-200102

“Cybersecurity company Secutec was founded in 2005 and is considered an authority in the field of cybersecurity, threat intelligence, and incident response services tailored to…”

Source: company website · checked Sep 5, 2026
3
Approach CyberIndirect evidence
Mont-saint-guibert, BelgiumHQ checked Sep 5, 202651-20088

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

Source: company website · checked Sep 5, 2026
4
ACENIndirect evidence
Kontich, BelgiumHQ checked Sep 5, 202651-20051

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

Source: company website · checked Sep 5, 2026
5
SecwisePartial evidence
Leuven, BelgiumHQ checked Sep 5, 202611-5028

“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 5, 2026
6
SertalinkIndirect evidence
St-niklaas, BelgiumHQ checked Sep 5, 202611-5028

“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 5, 2026
7
Upright SecurityIndirect evidence
Kontich, BelgiumHQ checked Sep 5, 202611-5022

“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 5, 2026
8
JimberIndirect evidence
Oostkamp, BelgiumHQ checked Sep 5, 202611-5022

“Protecting companies of all sizes with user-friendly, innovative and affordable cybersecurity solutions.”

Source: company website · checked Sep 5, 2026
9BelgiumHQ checked Sep 5, 202611-5020

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

Source: company website · checked Sep 5, 2026
10
Cresco CybersecurityIndirect evidence
Belgium France Luxembourg Netherlands, BelgiumHQ checked Sep 5, 202611-5019

“Cresco is your partner in cybersecurity.”

Source: company website · checked Sep 5, 2026
11
Resilient SecurityPartial evidence
Antwerp, BelgiumHQ checked Sep 5, 202611-5018

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

Source: company website · checked Sep 5, 2026
12
Actwise, An Acen CompanyPartial evidence
Kontich, BelgiumHQ checked Sep 5, 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 5, 2026
13
RedsystemIndirect evidence
Froyennes, BelgiumHQ checked Sep 5, 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 5, 2026
14
MCGIndirect evidence
Ottignies-louvain-la-neuve, BelgiumHQ checked Sep 5, 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 5, 2026
15
Easi NetworkIndirect evidence
Vise, BelgiumHQ checked Sep 5, 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 5, 2026
16Kontich, BelgiumHQ checked Sep 5, 202611-5010

“Soterics is more than a service provider.”

Source: company website · checked Sep 5, 2026
17
CuriosIndirect evidence
Antwerp, BelgiumHQ checked Sep 5, 20261-1010

“Curios is a boutique cybersecurity and compliance consultancy in Antwerp, serving enterprises across Belgium and Europe.”

Source: company website · checked Sep 5, 2026
18
NetcureIndirect evidence
Zaventem, BelgiumHQ checked Sep 5, 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 5, 2026
19
SplynterIndirect evidence
Kontich, BelgiumHQ checked Sep 5, 20261-108

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

Source: company website · checked Sep 5, 2026
20
Brand Solutions EuropeIndirect evidence
Sint-niklaas, BelgiumHQ checked Sep 5, 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 5, 2026
21
4netIndirect evidence
Mechelen, BelgiumHQ checked Sep 5, 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 5, 2026
22
Defend-OtIndirect evidence
Kampenhout, BelgiumHQ checked Sep 5, 20261-106

“Protecting What Keeps the World Running At Defend-OT, we specialize in cybersecurity for Operational Technology (OT) and forming the bridge between IT, helping organizations…”

Source: company website · checked Sep 5, 2026
23
CyberplanIndirect evidence
Oostkamp, BelgiumHQ checked Sep 5, 202611-506

“Wij geloven dat cybersecurity niet zo complex hoeft te zijn.”

Source: company website · checked Sep 5, 2026
24
Atendo I SecurePartial evidence
Paal-beringen, BelgiumHQ checked Sep 5, 20261-106

“Highly skilled IT consultants with focus on network & security.”

Source: company website · checked Sep 5, 2026
25
VeneritIndirect evidence
Dendermonde, BelgiumHQ checked Sep 5, 20261-106

“Venerit- beveiligt en beschermt het netwerk en de data van jouw kmo voor cyberaanvallen- stelt je (internationale) netwerk op punt en vereenvoudigt het beheer zodat je dat…”

Source: company website · checked Sep 5, 2026

Showing 25 of 170 managed security service providers based in Belgium

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Managed security service providers based in Belgium at a glance

As of Sep 5, 2026
1-10Median size (employees)
BrusselsLargest hub · 11 HQs
26Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
121
11-50
38
51-200
6
201-500
3
1,001-5,000
1

Verified emails by last verification

0–30
520
31–60
27
61–90
1
90–180
0
180+
1

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 managed security service providers, 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 “managed security service providers”. 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 managed security service providers, 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, 549 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 5, 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 managed security service providers are there based in Belgium?

RevenueBase identified 170 managed security service providers 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?

Nviso Security, headquartered in Belgium, tops this list with the largest team on record.

Which city has the most managed security service providers?

Brussels leads with 11 headquartered companies, followed by Kontich (10) and Antwerp (9).

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 549 verified decision-maker contacts tracked across these 170 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 5, 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.