Company lists · Data refreshed September 2026
Top 25 Security audit firms based in the Netherlands
RevenueBase identified 148 security audit firms headquartered in the Netherlands as of September 2026 and tracks 985 professional contacts across them, including 235 with verified work emails and 53 with mobile numbers. Amsterdam is the largest hub.
This list covers security audit firms headquartered in the Netherlands, 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 audit firms based in the Netherlands
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 37 | ||||
“Surelock IT Security Services helpt organisatie inzicht te krijgen in de IT-kwetsbaarheden van hun organisatie.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | 25 | ||||
“LBVD is een Delfts onderzoeks- en adviesbureau gespecialiseerd in digitale veiligheid, cybersecurity (ICT-security) en informatiebeveiliging, met 20+ jaar ervaring.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 24 | ||||
“In the 13 years that InAudit has been in existence, we have grown from a provider of internal audit services into a group that does much more than that.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 23 | ||||
“ThreadStone is uw toonaangevende specialist op het gebied van cybersecurity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 19 | ||||
“Bij Securesult richten we ons op het bieden van hoogwaardige informatiebeveiligingsoplossingen voor organisaties van elke omvang.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 18 | ||||
“DongIT is an independent web security and web development company specializing in penetration testing, secure software development, and custom-built web applications.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | 18 | ||||
“2-Control is an IT audit organization and offers support in providing insight into and improving the reliability of automated information.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | 16 | ||||
“REQON is gespecialiseerd in het uitvoeren van technische beveiligingsonderzoeken in de vorm van (maatwerk) penetratietesten en exposure onderzoeken.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 15 | ||||
“At Cyber Seals, we believe in a digital world where you can work, innovate, and grow securely.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 15 | ||||
“Argis IT Consultants is your partner in IT Control.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 14 | ||||
“Base is a niche consultancy & managed security solutions provider, offering services enabling organizations, and professionals, to build knowledge & capabilities in information…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 11 | ||||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 11 | ||||
“Even when your security is well underpinned, it remains important to remain alert to possible vulnerabilities, to the system's alerting and response capabilities and to the…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 11 | ||||
“Sekurno is a cybersecurity company that provides security services beyond mere compliance.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 11 | ||||
“Cyber7 Cyber Security Consultancy” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 10 | ||||
“Cyber Security Challengers (CSC) is uw onafhankelijke cybersecurity expert en dienstverlener.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 10 | ||||
“Hoe vatbaar is jouw organisatie voor hacks?” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | Hoek EN Blok.ItIndirect evidence | 10 | |||
“Hoek en Blok.IT is de professionele IT dienstverlener van Hoek en Blok.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 9 | ||||
“Diggle is een jonge, energieke organisatie met ervaren professionals, gericht op IT-audit, data-analyse en cybersecurity.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | Cyber Connects BVIndirect evidence | 9 | |||
“Zoeken naar verbinding, en het bieden van totaaloplossingen, dat is waar wij continu mee bezig zijn.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 | ||||
“NetBoss is committed to assisting companies, in the era of a growing number of Artificial Intelligence solutions, to understand potential cybersecurity risks that could directly…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 | ||||
“Blueprint Security specialises in manual penetration testing and multiple IT security certification consultancy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | Cqure ConsultingIndirect evidence | 5 | |||
“Het internet ontvouwt zich sinds de jaren 90 in razendsnel tempo.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 | ||||
“Shellback is an enthusiastic and dedicated team of security specialists based in Weert.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 4 | ||||
“ThreatLabs specializes in security assessments providing valuable insights in vulnerabilities and weaknesses as well as actionable advise to increase the security posture of IT…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 148 security audit firms based in the Netherlands
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Security audit firms based in the Netherlands 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 audit 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 the Netherlands whose own description of what they do matches “security audit 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 audit firms, and records with no verified work email. Companies headquartered outside Netherlands 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, 235 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 audit firms are there based in the Netherlands?
RevenueBase identified 148 security audit firms headquartered in the Netherlands 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?
Surelock IT Security Services, headquartered in Woerden, tops this list with the largest team on record.
Which city has the most security audit firms?
Amsterdam leads with 17 headquartered companies, followed by Utrecht (6) and The Hague (5).
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 235 verified decision-maker contacts tracked across these 148 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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