Company lists · Data refreshed September 2026

Top 25 Cybersecurity defense contractors based in Belgium

Name: Cybersecurity defense contractors based in Belgium
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 143 companies tracked

RevenueBase identified 143 cybersecurity defense contractors headquartered in Belgium as of September 2026 and tracks 8,030 professional contacts across them, including 2,433 with verified work emails and 326 with mobile numbers. Brussels is the largest hub.

This list covers cybersecurity defense contractors 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 1, 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 RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

143Companies

8,030Contacts tracked

2,433Verified emails

326Mobile numbers

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The 25 largest cybersecurity defense contractors based in Belgium

Ranked by team size

Top 25 of 143 cybersecurity defense contractors based in Belgium, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity defense contractors: 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	Orange Cyberdefense	Partial evidence	Belgium	1,001-5,000	3,706 contacts →
	Partial evidence “Orange Cyberdefense is the expert cybersecurity business unit of the Orange Group.” Source: RevenueBase Database · checked Sep 1, 2026
2	Terma Group	Partial evidence	Belgium	1,001-5,000	1,522 contacts →
	Partial evidence “Defense is a silent shield in an unpredictable world.” Source: RevenueBase Database · checked Sep 1, 2026
3	Approach Cyber	Indirect evidence	Mechelen, Belgium	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 1, 2026
4	Xalient Benelux	Indirect evidence	Asse, Belgium	201-500	74 contacts →
	Indirect evidence “Xalient ondersteunt toonaangevende organisaties bij het beschermen van hun meest waardevolle middelen: hun medewerkers, applicaties en data.” Source: RevenueBase Database · checked Sep 1, 2026
5	ACEN	Partial evidence	Kontich, Belgium	51-200	50 contacts →
	Partial evidence “Tailored, end-to-end solutions, suited to your cybersecurity needs.” Source: RevenueBase Database · checked Sep 1, 2026
6	Secwise	Indirect evidence	Leuven, Belgium	11-50	29 contacts →
	Indirect 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 1, 2026
7	Sertalink	Partial evidence	Belsele, Belgium	11-50	27 contacts →
	Partial 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 1, 2026
8	Upright Security	Partial evidence	Kontich, Belgium	11-50	21 contacts →
	Partial 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 1, 2026
9	Resilient Security	Partial evidence	Belgium	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 1, 2026
10	Thales Cyber Solutions Belgium	Indirect evidence	Belgium	11-50	20 contacts →
	Indirect evidence “At Thales Cyber Solutions Belgium, we strive for security & privacy.” Source: RevenueBase Database · checked Sep 1, 2026
11	Actwise	Indirect evidence	Kontich, Belgium	11-50	18 contacts →
	Indirect evidence “ActWise is the partner of choice for securing your identities and protecting what matters most within your company.” Source: RevenueBase Database · checked Sep 1, 2026
12	Redsystem	Indirect evidence	Froyennes, Belgium	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 1, 2026
13	MCG	Indirect evidence	Ottignies-Louvain-La-Neuve, Belgium	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 1, 2026
14	Splynter	Indirect evidence	Kontich, Belgium	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 1, 2026
15	Curios	Indirect evidence	Belgium	1-10	10 contacts →
	Indirect evidence “Curiosity is a powerful force.” Source: RevenueBase Database · checked Sep 1, 2026
16	Netcure	Indirect evidence	Zaventem, Belgium	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 1, 2026
17	Brand Solutions Europe	Partial evidence	Sint-Niklaas, Belgium	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 1, 2026
18	Cyberplan	Partial evidence	Oostkamp, Belgium	11-50	6 contacts →
	Partial evidence “Wij geloven dat cybersecurity niet zo complex hoeft te zijn.” Source: RevenueBase Database · checked Sep 1, 2026
19	Defend-Ot	Strong evidence	Kampenhout, Belgium	1-10	6 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 1, 2026
20	Focal Point SRL	Partial evidence	Belgium	11-50	6 contacts →
	Partial evidence “At Focal Point, we specialise in cyber defence capability development, cyber resilience, and operational readiness, helping governments, SOCs, and critical infrastructure…” Source: RevenueBase Database · checked Sep 1, 2026
21	Atendo I Secure	Indirect evidence	Paal-Beringen, Belgium	1-10	6 contacts →
	Indirect evidence “Highly skilled IT consultants with focus on network & security.” Source: RevenueBase Database · checked Sep 1, 2026
22	Guardis	Indirect evidence	Hannut, Belgium	1-10	5 contacts →
	Indirect evidence “Guardis helps organizations design, secure and operate their IT infrastructure, from cloud-native environments to industrial systems.” Source: RevenueBase Database · checked Sep 1, 2026
23	Apex Networks	Indirect evidence	Wingene, Belgium	1-10	4 contacts →
	Indirect evidence “Een goed werkend netwerk is voor elk bedrijf van cruciaal belang.” Source: RevenueBase Database · checked Sep 1, 2026
24	Safepoint	Indirect evidence	Zoutleeuw, Belgium	1-10	4 contacts →
	Indirect evidence “We are a team of cyber security experts with extensive experience in many industries.” Source: RevenueBase Database · checked Sep 1, 2026
25	Icteryus	Indirect evidence	Gentbrugge, Belgium	1-10	4 contacts →
	Indirect evidence “To protect global enterprises from emerging cyber security threats by delivering reliable and transparent services around the clock.” Source: RevenueBase Database · checked Sep 1, 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: cybersecurity defense contractors. 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 cybersecurity defense contractors.
Partial evidence: Its own public description names part of cybersecurity defense contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity defense contractors. 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 143 cybersecurity defense contractors based in Belgium

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Cybersecurity defense contractors based in Belgium at a glance

As of Sep 1, 2026

30.3%Verified-email coverage

4.1%Mobile-number coverage

56.2Average contacts per company

1-10Median size (employees)

7.7%Largest-city concentration · Brussels

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

103

11-50

51-200

201-500

1,001-5,000

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 cybersecurity defense contractors, 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 “cybersecurity defense contractors”. 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 cybersecurity defense contractors), 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 cybersecurity defense contractors, 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, 2,433 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 1, 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 cybersecurity defense contractors, 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 cybersecurity defense contractors are there based in Belgium?

RevenueBase identified 143 cybersecurity defense contractors 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?

Orange Cyberdefense, headquartered in Belgium, tops this list with the largest team on record.

Which city has the most cybersecurity defense contractors?

Brussels leads with 11 headquartered companies, followed by Antwerp (8) and Kontich (6).

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 2,433 verified decision-maker contacts tracked across these 143 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 1, 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.