Company lists · Data refreshed September 2026

Top 25 Web application security companies based in the Netherlands

Name: Web application security companies based in the Netherlands
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 123 companies tracked

RevenueBase identified 123 web application security companies headquartered in the Netherlands as of September 2026 and tracks 1,735 professional contacts across them, including 808 with verified work emails. Amsterdam is the largest hub.

This list covers web application 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, 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

123Companies

1,735Contacts tracked

808Verified emails

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The 25 largest web application security companies based in the Netherlands

Ranked by team size

Top 25 of 123 web application security companies based in the Netherlands, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to web application security companies: 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	Irdeto	Indirect evidence	Hoofddorp, NetherlandsHQ checked Sep 21, 2026	1,001-5,000	1,026 contacts →
	Indirect evidence “Irdeto, a CANAL+ company, is the world leader in digital platform cybersecurity, empowering businesses to innovate for a secure, connected future.” Source: RevenueBase Database · checked Sep 21, 2026
2	Xalient Benelux	Partial evidence	The Hague, NetherlandsHQ checked Sep 21, 2026	201-500	72 contacts →
	Partial evidence “Xalient ondersteunt toonaangevende organisaties bij het beschermen van hun meest waardevolle middelen: hun medewerkers, applicaties en data.” Source: RevenueBase Database · checked Sep 21, 2026
3	Surelock IT Security Services	Partial evidence	3447gg, NetherlandsHQ checked Sep 21, 2026	11-50	37 contacts →
	Partial evidence “Surelock IT Security Services helpt organisatie inzicht te krijgen in de IT-kwetsbaarheden van hun organisatie.” Source: RevenueBase Database · checked Sep 21, 2026
4	Securify	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	11-50	34 contacts →
	Partial evidence “Penetration Testing \| Agile Security Testing \| Red Teaming Securify is a cybersecurity company with a team of professional and passionate ethical hackers, secure coding experts…” Source: RevenueBase Database · checked Sep 21, 2026
5	MSML	Indirect evidence	Deventer, NetherlandsHQ checked Sep 21, 2026	11-50	30 contacts →
	Indirect evidence “MSML is focussing on small/medium sized companies who are in need of a dynamic and professional website or webapplication on a trusted and secure platform.” Source: RevenueBase Database · checked Sep 21, 2026
6	LBVD	Partial evidence	Delft, NetherlandsHQ checked Sep 21, 2026	11-50	25 contacts →
	Partial evidence “LBVD is een Delfts onderzoeks- en adviesbureau gespecialiseerd in digitale veiligheid, cybersecurity (ICT-security) en informatiebeveiliging, met 20+ jaar ervaring.” Source: RevenueBase Database · checked Sep 21, 2026
7	Threadstone Cyber Security	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “ThreadStone is uw toonaangevende specialist op het gebied van cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
8	Securesult	Indirect evidence	The Hague, NetherlandsHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “Bij Securesult richten we ons op het bieden van hoogwaardige informatiebeveiligingsoplossingen voor organisaties van elke omvang.” Source: RevenueBase Database · checked Sep 21, 2026
9	Dongit	Strong evidence	Leiden, NetherlandsHQ checked Sep 21, 2026	11-50	18 contacts →
	Strong evidence “DongIT is an independent web security and web development company specializing in penetration testing, secure software development, and custom-built web applications.” Source: RevenueBase Database · checked Sep 21, 2026
10	Un1quely	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 21, 2026	11-50	18 contacts →
	Indirect evidence “Founded in 2021 as a member of BrightMarbles Holding group from Rotterdam, Netherlands.” Source: RevenueBase Database · checked Sep 21, 2026
11	Reqon B.V	Indirect evidence	Leiderdorp, NetherlandsHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “REQON is gespecialiseerd in het uitvoeren van technische beveiligingsonderzoeken in de vorm van (maatwerk) penetratietesten en exposure onderzoeken.” Source: RevenueBase Database · checked Sep 21, 2026
12	HOB ICT Security	Partial evidence	Lopik, NetherlandsHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “Bij HOB ICT Security werken we dagelijks aan het versterken van de weerbaarheid van middelgrote en grote organisaties tegen alle vormen van cyberdreigingen.” Source: RevenueBase Database · checked Sep 21, 2026
13	Base Cyber Security	Partial evidence	Rotterdam, NetherlandsHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “Base is a niche consultancy & managed security solutions provider, offering services enabling organizations, and professionals, to build knowledge & capabilities in information…” Source: RevenueBase Database · checked Sep 21, 2026
14	Secwatch B.V	Partial evidence	Almere, NetherlandsHQ checked Sep 21, 2026	11-50	11 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
15	Whitehats B.V	Indirect evidence	Eindhoven, NetherlandsHQ checked Sep 21, 2026	11-50	11 contacts →
	Indirect evidence “We are eager to use our expertise to create a digital world where information is secure and websites are reliable.” Source: RevenueBase Database · checked Sep 21, 2026
16	Sekurno Cybersecurity	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	1-10	11 contacts →
	Partial evidence “Sekurno is a cybersecurity company that provides security services beyond mere compliance.” Source: RevenueBase Database · checked Sep 21, 2026
17	Cyber Cloud	Strong evidence	Bleskensgraaf, NetherlandsHQ checked Sep 21, 2026	1-10	10 contacts →
	Strong evidence “Cyber Cloud is een jong, ambitieus en innovatief bedrijf, gespecialiseerd in het uitvoeren van technische testen met als doel kwetsbaarheden in uw (web/mobiele)applicaties…” Source: RevenueBase Database · checked Sep 21, 2026
18	Cert2connect	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	1-10	9 contacts →
	Partial evidence “Cert2Connect BV is the go-to party in the field of advanced digital security solutions, security services and cyber security.” Source: RevenueBase Database · checked Sep 21, 2026
19	ONVIO	Indirect evidence	Utrecht, NetherlandsHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “Onvio is dé specialist in het uitvoeren van Pentesten.” Source: RevenueBase Database · checked Sep 21, 2026
20	Data4 Cyber Security	Indirect evidence	Maastricht-airport, NetherlandsHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Zoekt u digitale rust en zekerheid?” Source: RevenueBase Database · checked Sep 21, 2026
21	Websafety Ninja	Strong evidence	Reuver, NetherlandsHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “Keeping your web applications secure is vitally important for business those days.” Source: RevenueBase Database · checked Sep 21, 2026
22	Securiment	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	11-50	8 contacts →
	Partial evidence “SECURiMENT provides software solutions and services for security needs of your company.” Source: RevenueBase Database · checked Sep 21, 2026
23	Websec B.V	Partial evidence	Amsterdam, NetherlandsHQ checked Sep 21, 2026	11-50	8 contacts →
	Partial evidence “WebSec is an all-in-one security company.” Source: RevenueBase Database · checked Sep 21, 2026
24	Attic Security	Indirect evidence	Zevenbergen, NetherlandsHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “With Attic, the hacking experts from Zolder provide organizations with high-end cybersecurity operations.” Source: RevenueBase Database · checked Sep 21, 2026
25	Hackdefense	Indirect evidence	Leiden, NetherlandsHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “HackDefense is sinds 2023 onderdeel van Securance.” 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: web application security companies. 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 web application security companies.
Partial evidence: Its own public description names part of web application security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name web application security companies. 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 123 web application security companies based in the Netherlands

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Web application security companies based in the Netherlands at a glance

As of Sep 21, 2026

46.6%Verified-email coverage

14.1Average contacts per company

1-10Median size (employees)

15.4%Largest-city concentration · Amsterdam

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured worldwide rather than for Netherlands, so it is reported there. Company counts and contact totals on this page are exact for Netherlands, over 123 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 web application security companies, 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 the Netherlands whose own description of what they do matches “web application security companies”. 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 web application security companies), 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 web application 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 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, 808 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 web application security companies, 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 web application security companies are there based in the Netherlands?

RevenueBase identified 123 web application 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?

Irdeto, headquartered in Ls, tops this list with the largest team on record.

Which city has the most web application security companies?

Amsterdam leads with 19 headquartered companies, followed by Groningen (5) and Rotterdam (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 808 verified decision-maker contacts tracked across these 123 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.