Company lists · Data refreshed September 2026
Top 24 IT security companies based in the Netherlands
RevenueBase identified 383 IT security companies headquartered in the Netherlands as of September 2026 and tracks 22,051 professional contacts across them, including 12,372 with verified work emails and 6,443 with mobile numbers. Amsterdam is the largest hub.
This list covers IT security companies 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 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 24 largest IT security companies based in the Netherlands
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 237 | ||||
“Fox-IT prevents, solves and mitigates the most serious cyber threats with innovative solutions for government, defense, law enforcement, critical infrastructure, banking, and…” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 2 | 210 | ||||
“Eye Security protects small and medium-sized European enterprises from cyber threats and the high costs that follow after a successful attack.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 3 | 153 | ||||
“Wij ontwerpen, implementeren en beheren veilige IT-infrastructuur en Cybersecurity Services.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 4 | 106 | ||||
“Pinewood te Delft is al 28 jaar de specialist in cybersecurity en voor veel bedrijven en organisaties de one-stop security partner.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 5 | On2it CybersecurityIndirect evidence | 83 | |||
“ON2IT is a global pure-play cybersecurity service provider.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 6 | 59 | ||||
“Nedscaper delivers pragmatic, accessible cybersecurity services across Europe and Africa.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 7 | 40 | ||||
“Hunt & Hackett helps European companies prevent, detect and respond to today’s most advanced adversaries, safeguarding them against cyberthreats and espionage.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 8 | 37 | ||||
“Surelock IT Security Services helpt organisatie inzicht te krijgen in de IT-kwetsbaarheden van hun organisatie.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 9 | 28 | ||||
“At Nubix, we stand for innovation and top quality in IT solutions.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 10 | 27 | ||||
“Tachyon Security BV is based just outside The Hague in the Netherlands.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 11 | 25 | ||||
“Onze missie, visie & strategie Wij willen onze samenleving veiliger maken en dat doen we dankzij de zeer specialistische kennis van onze cybersecurity experts.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 12 | 24 | ||||
“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 4, 2026Thanks. The Data Team will review it. | |||||
| 13 | 23 | ||||
“Founded in 2021 as a member of BrightMarbles Holding group from Rotterdam, Netherlands.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 14 | 23 | ||||
“ThreadStone is uw toonaangevende specialist op het gebied van cybersecurity.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 15 | 21 | ||||
“PuraSec levert expertise op het gebied van cybersecurity binnen de deelgebieden; mens, beleid en techniek.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 16 | 20 | ||||
“Digitale veiligheid is van levensbelang voor bedrijven, de maatschappij en de mens.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 17 | 20 | ||||
“Want to take your company’s digital security to the next level?” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 18 | 19 | ||||
“Bij Securesult richten we ons op het bieden van hoogwaardige informatiebeveiligingsoplossingen voor organisaties van elke omvang.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 19 | West ConsultingIndirect evidence | 19 | |||
Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 4, 2026Thanks. The Data Team will review it. | |||||
| 21 | 18 | ||||
“Defenced is the IT security knowledge partner for large and medium-sized organizations.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 22 | 16 | ||||
“Route443 – Uw Cybersecurity Crime Fighters Bij Route443 beschouwen we onszelf als de onverschrokken misdaadbestrijders van het digitale tijdperk.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 23 | 16 | ||||
“Onyx Cyber Security provides a number of services related to the field of IT security.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
| 24 | 15 | ||||
“At Cyber Seals, we believe in a digital world where you can work, innovate, and grow securely.” Source: company website · checked Sep 4, 2026Thanks. The Data Team will review it. | |||||
Showing 24 of 383 IT security companies based in the Netherlands
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IT security companies based in the Netherlands 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 the Netherlands 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 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, 12,372 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 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.
IT security companies by metro
- IT security companies in Amsterdam36
Frequently asked
How many IT security companies are there based in the Netherlands?
RevenueBase identified 383 IT security companies 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?
Fox-It, headquartered in Gk, tops this list with the largest team on record.
Which city has the most IT security companies?
Amsterdam leads with 36 headquartered companies, followed by Rotterdam (12) and The Hague (12).
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 12,372 verified decision-maker contacts tracked across these 383 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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