Company lists · Data refreshed September 2026
Top 25 IT security companies based in Belgium
RevenueBase identified 181 IT security companies headquartered in Belgium as of September 2026 and tracks 4,662 professional contacts across them, including 2,441 with verified work emails and 87 with mobile numbers. Brussels is the largest hub.
This list covers IT security companies 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.
The 25 largest IT security companies based in Belgium
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 93 | ||||
“Approach Cyber is a trusted cyber resilience partner supporting organizations across Belgium and Switzerland.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 50 | ||||
“Tailored, end-to-end solutions, suited to your cybersecurity needs.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 29 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 27 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 5 | 21 | ||||
“Protecting companies of all sizes with user-friendly, innovative and affordable cybersecurity solutions.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 21 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 7 | 20 | ||||
“Resilient Security is your trusted partner in cybersecurity, bridging the gap between big consultancy firms and system integrators.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | Thales Cyber Solutions BelgiumPartial evidence | 20 | |||
“At Thales Cyber Solutions Belgium, we strive for security & privacy.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 18 | ||||
“ActWise is the partner of choice for securing your identities and protecting what matters most within your company.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 18 | ||||
“Our mission is to advise and support you in minimizing the attack surface that could threaten your business.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 18 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 12 | 16 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 13 | Easi NetworkIndirect evidence | 11 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 14 | 10 | ||||
“At Splynter we want to help companies understand their adversaries and how to combat them.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 10 | ||||
“Soterics is more than a service provider.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 10 | ||||
“Curiosity is a powerful force.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 9 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 18 | 8 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 19 | XcelleratePartial evidence | 7 | |||
“IT-infrastructuur & cybersecurity NIS2 compliance advies 24/7 monitoring & response Bedrijfskritische continuïteit Transformeren uw IT van risicofactor naar concurrentievoordeel.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | 6 | ||||
“Bij Fox & Fish Cyberdefense werken we op vier domeinen om uw organisatie te beveiligen tegen hacking en cyberaanvallen- Cybersecurity audits & risicoanalyses - Bewustmaking &…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 | ||||
“Wij geloven dat cybersecurity niet zo complex hoeft te zijn.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 | ||||
“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 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 6 | ||||
“Highly skilled IT consultants with focus on network & security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 24 | 6 | ||||
“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 4, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 | ||||
“Most companies discover a security gap only after a breach.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 181 IT security companies based in Belgium
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IT security companies based in Belgium at a glance
As of Sep 4, 2026Companies by employee count
Verified emails by last verification
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 companies, 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 companies”. 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 companies, 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, 2,441 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 companies are there based in Belgium?
RevenueBase identified 181 IT security companies 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 companies?
Brussels leads with 13 headquartered companies, followed by Antwerp (7) and Kontich (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 2,441 verified decision-maker contacts tracked across these 181 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.
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