Company lists · Data refreshed September 2026

Top 25 Ot cyber solutions based in Belgium

Name: Ot cyber solutions based in Belgium
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 59 companies tracked

RevenueBase identified 59 ot cyber solutions headquartered in Belgium as of September 2026 and tracks 737 professional contacts across them, including 372 with verified work emails. Antwerp is the largest hub.

This list covers ot cyber solutions 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 21, 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 21, 2026 86% judged on-target in blind review

59Companies

737Contacts tracked

372Verified emails

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The 25 largest ot cyber solutions based in Belgium

Ranked by team size

Top 25 of 59 ot cyber solutions based in Belgium, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to ot cyber solutions: 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	Nviso Security	Partial evidence	Brussels, BelgiumHQ checked Sep 21, 2026	201-500	315 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
2	Approach Cyber	Partial evidence	Mont-saint-guibert, BelgiumHQ checked Sep 21, 2026	51-200	88 contacts →
	Partial evidence “Approach Cyber is a trusted cyber resilience partner supporting organizations across Belgium and Switzerland.” Source: RevenueBase Database · checked Sep 21, 2026
3	Sertalink	Indirect evidence	St-niklaas, BelgiumHQ checked Sep 21, 2026	11-50	28 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 21, 2026
4	Thales Cyber Solutions Belgium	Strong evidence	BelgiumHQ checked Sep 21, 2026	11-50	20 contacts →
	Strong evidence “At Thales Cyber Solutions Belgium, we strive for security & privacy.” Source: RevenueBase Database · checked Sep 21, 2026
5	Cresco Cybersecurity	Indirect evidence	Belgium France Luxembourg Netherlands, BelgiumHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “Cresco is your partner in cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
6	Resilient Security	Indirect evidence	Antwerp, BelgiumHQ checked Sep 21, 2026	11-50	18 contacts →
	Indirect evidence “Resilient Security is your trusted partner in cybersecurity, bridging the gap between big consultancy firms and system integrators.” Source: RevenueBase Database · checked Sep 21, 2026
7	Actwise, An Acen Company	Indirect evidence	Kontich, BelgiumHQ checked Sep 21, 2026	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 21, 2026
8	SANDT	Partial evidence	Brussels, BelgiumHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “At SANDT, we pride ourselves on being at the forefront of IT/OT convergence by combining teams of strategic and technological consultants, offering a unique blend of services that…” Source: RevenueBase Database · checked Sep 21, 2026
9	MCG	Indirect evidence	Ottignies-louvain-la-neuve, BelgiumHQ checked Sep 21, 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 21, 2026
10	Soterics, Your End-To-End Partner In OT Security	Indirect evidence	Kontich, BelgiumHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “Soterics is more than a service provider.” Source: RevenueBase Database · checked Sep 21, 2026
11	Curios	Indirect evidence	Antwerp, BelgiumHQ checked Sep 21, 2026	1-10	10 contacts →
	Indirect evidence “Curios is a boutique cybersecurity and compliance consultancy in Antwerp, serving enterprises across Belgium and Europe.” Source: RevenueBase Database · checked Sep 21, 2026
12	Splynter	Indirect evidence	Kontich, BelgiumHQ checked Sep 21, 2026	1-10	8 contacts →
	Indirect evidence “At Splynter we want to help companies understand their adversaries and how to combat them.” Source: RevenueBase Database · checked Sep 21, 2026
13	Defend-Ot	Partial evidence	Kampenhout, BelgiumHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial 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 21, 2026
14	Aspida	Indirect evidence	Bruges, BelgiumHQ checked Sep 21, 2026	1-10	5 contacts →
	Indirect evidence “At, we understand the unique challenges of securing Operational Technology environments.” Source: RevenueBase Database · checked Sep 21, 2026
15	Resilix	Partial evidence	Hasselt, BelgiumHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “At Resilix, we focus on providing targeted security solutions designed from a pragmatic approach to best protect your organisation from today's complex threats.” Source: RevenueBase Database · checked Sep 21, 2026
16	Guardis	Indirect evidence	Hannut, BelgiumHQ checked Sep 21, 2026	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 21, 2026
17	Soteria	Partial evidence	Ghent, BelgiumHQ checked Sep 21, 2026	1-10	4 contacts →
	Partial evidence “Experten in IT en OT Cyberveiligheid - Cybersecurity diensten op maat van uw organisatie- Security doorlichtingen, audits, pen-tests - NIS2, Cyfun en ISO27001 begeleidingen -…” Source: RevenueBase Database · checked Sep 21, 2026
18	Infosec4you	Indirect evidence	Bruxelles Bruxelles, BelgiumHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “INFOSEC4YOU est une Start-up spécialisée exclusivement dans la cybersécurité, nous protégeons les données, les entreprises et les citoyens contre la cybercriminalité et les…” Source: RevenueBase Database · checked Sep 21, 2026
19	Cybervalue	Indirect evidence	Leuven, BelgiumHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “He who defends everything, defends nothing” - No IT Security team can monitor every application, network, system and information asset that a company has, no incident response…” Source: RevenueBase Database · checked Sep 21, 2026
20	Claireity Consulting	Indirect evidence	Brussels, BelgiumHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “Claireity Consulting: Cybersecurity Reimagined At Claireity Consulting, we blend the art of security with the precision of technology to safeguard your digital journey.” Source: RevenueBase Database · checked Sep 21, 2026
21	Kemsec	Strong evidence	Leuvensesteenweg, BelgiumHQ checked Sep 21, 2026	1-10	2 contacts →
	Strong evidence “KemSec provides a comprehensive portfolio of integrated cyber security solutions providing unified enterprise wide protection for operators of industrial environments.” Source: RevenueBase Database · checked Sep 21, 2026
22	Odsc Sprl	Indirect evidence	Namur, BelgiumHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “Chez ODSC, nous accompagnons les entreprises dans la sécurisation de leurs actifs numériques à travers une approche complète et humaine de la cybersécurité.” Source: RevenueBase Database · checked Sep 21, 2026
23	Otsecure BV	Indirect evidence	Ekeren, BelgiumHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “In Belgium, there are an estimated industrial manufacturing companies.” Source: RevenueBase Database · checked Sep 21, 2026
24	Securenza	Indirect evidence	Genk, BelgiumHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “We aim to improve the overall security posture and security practices of our clients.” Source: RevenueBase Database · checked Sep 21, 2026
25	Zuonet	Indirect evidence	Kapellen, BelgiumHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “We deliver end-to-end datacommunication and security architecture services.” Source: RevenueBase Database · checked Sep 21, 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: ot cyber solutions. 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 ot cyber solutions.
Partial evidence: Its own public description names part of ot cyber solutions, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ot cyber solutions. 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 59 ot cyber solutions based in Belgium

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Ot cyber solutions based in Belgium at a glance

As of Sep 21, 2026

50.5%Verified-email coverage

12.5Average contacts per company

1-10Median size (employees)

10.2%Largest-city concentration · Antwerp

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for Belgium, so it is reported there. Company counts and contact totals on this page are exact for Belgium, over 59 companies.

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 ot cyber solutions, 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 “ot cyber solutions”. 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 ot cyber solutions), 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 ot cyber solutions, 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, 372 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 21, 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 ot cyber solutions, 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 ot cyber solutions are there based in Belgium?

RevenueBase identified 59 ot cyber solutions 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 ot cyber solutions?

Antwerp leads with 6 headquartered companies, followed by Brussels (4) and Kontich (4).

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 372 verified decision-maker contacts tracked across these 59 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 21, 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.