Company lists · Data refreshed September 2026
Top 25 Security auditing firms based in Belgium
RevenueBase identified 110 security auditing firms headquartered in Belgium as of September 2026 and tracks 995 professional contacts across them, including 485 with verified work emails and 54 with mobile numbers. Brussels is the largest hub.
This list covers security auditing 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 6, 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 security auditing firms based in Belgium
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 315 | ||||
“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 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 154 | ||||
“From vulnerability management to penetration testing, secure everything you build, host, and run with Aikido.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 67 | ||||
“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 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 29 | ||||
“i-Force is an idenpendent forensic audit firm offering the following services : investigation, advice, interim and training in relation to tfe following topics : fraud, IT-risk…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 28 | ||||
“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 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 21 | ||||
“The main goal of the Security Factory is to test/assess the current security maturity level of clients.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | Thales Cyber Solutions BelgiumPartial evidence | 20 | |||
“At Thales Cyber Solutions Belgium, we strive for security & privacy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 19 | ||||
“Cresco is your partner in cybersecurity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 18 | ||||
“Resilient Security is your trusted partner in cybersecurity, bridging the gap between big consultancy firms and system integrators.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 10 | ||||
“Curios is a boutique cybersecurity and compliance consultancy in Antwerp, serving enterprises across Belgium and Europe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 8 | ||||
“At Splynter we want to help companies understand their adversaries and how to combat them.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 6 | ||||
“Wij geloven dat cybersecurity niet zo complex hoeft te zijn.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 6 | ||||
“Highly skilled IT consultants with focus on network & security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 5 | ||||
“Apogado is a vendor-neutral company focusing on the multidisciplinary field of information security, privacy, and eGovernment.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 5 | ||||
“Most companies discover a security gap only after a breach.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 5 | ||||
“Guardis helps organizations design, secure and operate their IT infrastructure, from cloud-native environments to industrial systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 | ||||
“Leveraging our profound expertise in IT, Cybersecurity and Risk Management, DigiSôter aims to be your preferred partner in aligning these capabilities with your business needs.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 3 | ||||
“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: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 3 | ||||
“Qfirst helps companies to protect their data through both technical solutions and by applying cyber security processes and frameworks to their processes and their IT…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 3 | ||||
“Claireity Consulting: Cybersecurity Reimagined At Claireity Consulting, we blend the art of security with the precision of technology to safeguard your digital journey.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 3 | ||||
“At Spectre Advisory, we go beyond the basics of information security.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 2 | ||||
“Robrechts & Thienpont guides your company to the desired security level.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 2 | ||||
“MP8 Consulting S.P.R.L.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 2 | ||||
“Chez ODSC, nous accompagnons les entreprises dans la sécurisation de leurs actifs numériques à travers une approche complète et humaine de la cybersécurité.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 110 security auditing firms based in Belgium
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Security auditing firms based in Belgium at a glance
As of Sep 6, 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 security auditing 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 “security auditing 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 security auditing 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, 485 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 6, 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 security auditing firms are there based in Belgium?
RevenueBase identified 110 security auditing 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?
Nviso Security, headquartered in Belgium, tops this list with the largest team on record.
Which city has the most security auditing firms?
Brussels leads with 11 headquartered companies, followed by Antwerp (7) and Antwerpen (3).
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 485 verified decision-maker contacts tracked across these 110 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 6, 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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