Top 10 Penetration Testing Companies in the Netherlands

Finding the right penetration testing partner in the Netherlands is not a decision to take lightly. Dutch organizations face a growing volume of cyber threats alongside strict regulatory obligations under GDPR, NIS2, and the Dutch Cybersecurity Act. A qualified penetration testing firm does more than run automated scans — it simulates real-world attacks, surfaces hidden vulnerabilities, and delivers actionable remediation guidance your team can actually use.

This guide evaluates ten of the most reputable penetration testing providers operating in the Netherlands, covering their areas of specialization, notable strengths, and the types of organizations they are best suited to serve.

What to Look For in a Dutch Penetration Testing Provider

Before reviewing specific companies, it helps to know which criteria separate a capable provider from a generic one.

Recognized certifications are a baseline indicator of technical credibility. Look for testers holding OSCP (Offensive Security Certified Professional), CREST, CEH (Certified Ethical Hacker), or GPEN credentials. Firms certified to ISO 27001 or holding CREST organizational accreditation offer an additional layer of assurance.

Regulatory familiarity matters enormously in the Netherlands. Your provider should understand GDPR Article 32 security obligations, NIS2 requirements for critical infrastructure operators, and sector-specific frameworks such as DORA for financial services.

Methodology transparency is a quality signal. Reputable firms follow established frameworks like PTES (Penetration Testing Execution Standard), OWASP for application testing, and TIBER-EU for red team exercises in the financial sector. Ask to see a sample report before engaging.

Report quality is where many providers fall short. A good penetration test report clearly prioritizes findings by business risk, explains each vulnerability in plain language, and provides concrete remediation steps — not just a list of CVEs.

The 10 Best Penetration Testing Companies in the Netherlands

1. Fox-IT (Part of NCC Group) — Delft

Fox-IT is widely regarded as one of the most technically rigorous cybersecurity firms in the Netherlands. Founded in 1999, the company has a long track record in high-security environments including government, critical infrastructure, and financial services. Since becoming part of NCC Group, it has access to global research resources while maintaining strong local expertise.

Specializations: Advanced red teaming, cryptography, digital forensics, incident response integration, government and defense sector testing.

Best suited for: Large enterprises and public sector organizations requiring deep technical expertise and security-cleared personnel.

Notable strength: Fox-IT operates its own dedicated research team (Fox-IT Labs) and has been involved in several high-profile national cybersecurity investigations, lending its commercial engagements significant credibility.

2. Secura B.V. — Amsterdam & Eindhoven

Secura is one of the Netherlands’ most established independent security consultancies, with deep expertise in both IT and operational technology (OT) environments. The firm is particularly well known for testing industrial control systems and critical infrastructure — a niche that demands specialized skills most generalist firms do not possess.

Specializations: OT/ICS security, IoT penetration testing, critical infrastructure assessments, NIS2 compliance testing, social engineering.

Best suited for: Manufacturing, energy, utilities, and transport organizations with complex OT environments alongside traditional IT infrastructure.

Notable strength: Secura holds CREST accreditation and is one of the few Dutch firms with demonstrable OT/ICS testing experience at scale.

3. Northwave — Utrecht

Northwave operates as a full-spectrum cybersecurity firm combining strategic consulting, managed security services, and technical testing under one roof. This integrated model is particularly valuable for organizations that want penetration test findings to feed directly into a broader risk management and remediation program.

Specializations: Application and network penetration testing, red teaming, risk assessments, managed detection and response.

Best suited for: Mid-to-large enterprises seeking a long-term security partner rather than a one-off test engagement.

Notable strength: Northwave’s incident response team works alongside its pen testing practice, meaning they understand both the attacker’s perspective and the defender’s operational reality.

4. Computest Security — The Hague

Computest Security focuses on application security and infrastructure testing with a strong emphasis on integrating security into development pipelines. Their DevSecOps-aligned approach makes them a natural fit for software companies and organizations running agile development environments.

Specializations: Web application testing, mobile security, API security, cloud infrastructure testing, red teaming, DevSecOps integration.

Best suited for: Technology companies, SaaS providers, and organizations with fast-moving development cycles that need security embedded into their release process.

Notable strength: Computest has built a reputation for communicating findings clearly to both technical and non-technical stakeholders, making remediation more actionable across the business.

5. Tesorion — Nieuwegein (Utrecht Region)

Tesorion serves a broad client base from SMEs to larger enterprises, with a particular focus on making enterprise-grade security accessible to organizations that may not have large in-house security teams. Their testing services are designed to integrate with their managed security offering, providing continuity between assessment and ongoing monitoring.

Specializations: Internal and external network testing, phishing and social engineering simulations, endpoint security assessments, managed SOC services.

Best suited for: Small-to-medium enterprises and organizations looking to combine penetration testing with ongoing managed security support.

Notable strength: Tesorion’s approachable engagement model and clear reporting make it a strong choice for organizations running their first formal penetration test.

6. WebSec B.V. — Amsterdam

WebSec is a specialist offensive security firm with a tight focus on web applications, mobile platforms, and IoT. As a boutique provider, they operate with a small team of senior researchers rather than scaling with junior staff — a model that tends to produce higher quality findings on complex targets.

Specializations: Web application penetration testing, mobile application security, IoT security, API testing, red team exercises.

Best suited for: Technology companies, fintech firms, and any organization where application security is the primary concern.

Notable strength: WebSec’s researchers are actively involved in the security research community and have disclosed vulnerabilities in widely used platforms, reflecting genuine offensive security depth.

7. Hadrian Security — Amsterdam

Hadrian takes a technology-forward approach to penetration testing, using automated attack surface management to continuously map and assess external exposure. Their platform is particularly useful for organizations that need ongoing visibility rather than point-in-time assessments.

Specializations: Automated and manual penetration testing, attack surface management, SaaS security reviews, cloud security assessments, compliance readiness.

Best suited for: Scale-ups, tech-first companies, and organizations with large and frequently changing external attack surfaces.

Notable strength: Hadrian’s combination of automation and manual testing allows for faster coverage at scale, making continuous security monitoring more economically viable.

8. Cyver.io — Amsterdam

Cyver.io operates a Penetration Testing as a Service (PTaaS) model, delivering findings through a client-facing platform that makes vulnerability tracking and remediation management significantly more efficient than traditional PDF-based reporting.

Specializations: PTaaS, continuous vulnerability management, web and infrastructure testing, automated security workflows.

Best suited for: Organizations that run frequent testing cycles and want real-time visibility into their security posture rather than periodic reports.

Notable strength: The platform approach to reporting gives security and development teams a shared workspace for tracking remediation progress, reducing the gap between finding and fix.

9. Dark Entry — Amsterdam

Dark Entry is a boutique firm specializing in offensive security with a focus on simulating sophisticated, targeted attacks. Their engagements are designed to go beyond checklist-style testing and model the tactics, techniques, and procedures (TTPs) used by actual threat actors.

Specializations: Red team operations, ethical hacking, wireless and network penetration testing, custom threat simulation, physical security testing.

Best suited for: Organizations with mature security programs looking to validate their detection and response capabilities under realistic attack conditions.

Notable strength: Dark Entry’s engagement approach is highly customized — they build threat scenarios around a client’s specific industry and likely adversaries, rather than running generic test playbooks.

10. Factosecure — Amsterdam, Rotterdam, The Hague

Factosecure offers penetration testing alongside a broader portfolio of cybersecurity services including SOC-as-a-Service and threat intelligence. Their coverage of multiple Dutch cities gives them practical reach for organizations with distributed operations, and their experience spans finance, healthcare, and logistics sectors.

Specializations: Web, mobile, and network penetration testing, cloud and IoT security assessments, red teaming, vulnerability management, GDPR and ISO 27001 compliance audits.

Best suited for: Organizations seeking a single vendor for both penetration testing and ongoing managed security services.

Notable strength: Factosecure’s integrated service model means that findings from a penetration test can be handed directly to their SOC team for ongoing monitoring — useful for clients who want assessment and detection under one umbrella.

Comparing Your Options: Key Considerations

The right provider depends heavily on your organization’s size, sector, and security maturity.

For OT/ICS environments: Secura is the clear specialist choice, with Fox-IT as a strong alternative for high-security contexts.

For application-heavy organizations: WebSec, Computest, and Cyver.io each bring strong application security credentials, with Cyver.io offering the most modern delivery model.

For SMEs running their first test: Tesorion and Factosecure offer structured, accessible engagement models without assuming a high level of in-house security expertise.

For mature security programs: Fox-IT, Northwave, and Dark Entry are best positioned to deliver the adversarial realism and strategic depth that organizations with existing security controls need.

For continuous testing: Hadrian and Cyver.io are designed for ongoing assessment rather than annual point-in-time engagements.

Understanding Dutch Regulatory Context

Organizations operating in the Netherlands should ensure their penetration testing aligns with current regulatory expectations. NIS2, which came into force in the EU in October 2024, requires operators of essential and important entities to conduct regular security assessments — penetration testing is increasingly cited in guidance as a core mechanism for meeting this obligation.

GDPR Article 32 similarly requires organizations to implement appropriate technical and organizational measures, and regulators have begun to view the absence of regular security testing as evidence of inadequate security practice.

For financial institutions, the DORA (Digital Operational Resilience Act) regulation introduces specific requirements for threat-led penetration testing (TLPT), aligned with the TIBER-EU framework. If your organization falls under DORA, verify that your chosen provider has experience with TIBER-EU engagements specifically.

Questions to Ask Before You Hire

Regardless of which provider you shortlist, ask these questions before signing an engagement:

• What methodology do you follow, and can you share a sanitized sample report?
• Which certifications do your testers hold (OSCP, CREST, CEH, GPEN)?
• How do you scope engagements, and how is scope creep handled?
• What is your process for handling critical vulnerabilities discovered during testing?
• How do you support our team through remediation after the report is delivered?
• Have you worked with organizations in our sector before?

The answers will tell you a great deal about the maturity and professionalism of a firm before any testing begins.

Final Word

The Netherlands has a mature and competitive penetration testing market. Whether you are a large enterprise seeking adversarial red team exercises or an SME running your first structured security assessment, there is a provider on this list suited to your needs.

The best approach is to request scoping calls with two or three providers, compare their methodology and reporting samples, and choose the firm whose technical depth and communication style best fits your organization’s context.