Top 10 Best Cybersecurity Companies in South Holland

South Holland: A European Cybersecurity Capital

South Holland plays an outsized role in European cybersecurity. The Hague hosts The Hague Security Delta, the largest security cluster in Europe, bringing together companies, government agencies and knowledge institutions. The city is also home to the Dutch National Cyber Security Centre and the European Cybercrime Centre at Europol. Delft, meanwhile, has produced some of the most respected security companies in the Netherlands.

The region's critical infrastructure, including the Port of Rotterdam, energy facilities, government ministries and international organisations, makes strong cybersecurity essential. As threats such as ransomware, supply chain attacks and state-sponsored espionage grow, demand for specialised security expertise continues to rise.

Our Selection Criteria

We evaluated companies on technical expertise, incident response capabilities, reputation, certifications, innovation and their presence in South Holland. The list includes managed detection and response providers, penetration testers, network security specialists and large security organisations.

The Top 10 Cybersecurity Companies in South Holland

1. Fox-IT

Founded in Delft and now part of NCC Group, Fox-IT is one of the most renowned cybersecurity firms in Europe. It is known for incident response, threat intelligence, forensic investigations and high-assurance security solutions for government and critical infrastructure. Fox-IT's researchers have been involved in uncovering major cyber operations, earning international recognition.

2. Eye Security

The Hague-based Eye Security protects small and mid-sized European businesses with a combination of managed detection and response and cyber insurance. Its around-the-clock security operations centre monitors endpoints and cloud environments, and its integrated insurance offering helps companies recover financially if an incident occurs.

3. Hunt & Hackett

Hunt & Hackett, based in The Hague, specialises in proactive cyber defence against advanced adversaries. Its experts combine threat intelligence, detection engineering and incident response to protect organisations that are likely targets of sophisticated attacks, including those in critical sectors.

4. Computest Security

Computest Security, headquartered in Zoetermeer, is a leading Dutch provider of penetration testing, red teaming and security research. Its ethical hackers have discovered vulnerabilities in widely used products, and the company helps organisations identify and fix weaknesses before attackers exploit them.

5. KPN Security

As part of The Hague-based KPN, KPN Security offers managed security services, a security operations centre, network protection and consultancy. Its scale and deep insight into Dutch network traffic give it a unique position in detecting and mitigating threats for businesses and public organisations.

6. Nomios

Nomios, with roots in Leiden through Infradata, provides network security, zero trust architecture and managed security services. Its engineers design and operate firewalls, secure access solutions and security monitoring for enterprises and service providers across the region.

7. Thales Netherlands

Thales has a significant presence in the Netherlands, including activities in Delft. It offers cybersecurity solutions for defence, government and critical infrastructure, including encryption, secure communications and security monitoring. Its expertise in high-security environments is especially valued by public sector clients in The Hague.

8. Northwave

Northwave is a Dutch intelligent security operations provider that serves many organisations in South Holland. It combines managed detection and response, a computer emergency response team and information security management consultancy, offering a holistic approach to cyber resilience.

9. Secura

Secura, part of Bureau Veritas, is a Dutch security specialist providing penetration testing, security audits, awareness training and certification services. It is particularly active in industrial and operational technology security, which is highly relevant for the port, energy and manufacturing sectors around Rotterdam.

10. Deloitte Cyber

Deloitte's cyber practice operates from offices including Rotterdam and The Hague. It advises large organisations and government agencies on cyber strategy, risk management, identity and access management and incident response, helping boards understand and manage cyber risk as a business issue.

Cybersecurity Trends in 2026

The implementation of the European NIS2 directive has significantly expanded the number of organisations subject to strict cybersecurity obligations, driving investment in risk management and incident reporting. Ransomware remains a major threat, and managed detection and response services have become essential for organisations without large in-house security teams.

Operational technology security is gaining attention as ports, energy grids and greenhouses become more connected. AI is being used on both sides, with attackers automating phishing and defenders using machine learning to detect anomalies faster. Zero trust architectures and secure cloud configurations are becoming standard practice.

How to Choose a Cybersecurity Partner

Begin with a clear understanding of your risks and regulatory obligations. Look for providers with relevant certifications, proven incident response experience and transparent reporting. Ask how quickly they can respond to incidents, what their detection capabilities cover and how they keep up with emerging threats. The right partner should strengthen your team, not just sell products.

Building a Security Culture

Technology alone cannot stop every attack. Many incidents begin with a phishing email or a weak password, which is why leading security companies in South Holland also emphasise awareness training, phishing simulations and clear incident procedures. Regular tabletop exercises help management teams practise decision making during a crisis. Organisations that combine strong technical controls with engaged, well-informed employees are far more resilient, and a good security partner will help build both layers of defence over time.

Conclusion

South Holland's cybersecurity ecosystem, anchored by The Hague Security Delta and Delft's security heritage, offers world-class protection. These ten companies help organisations defend against evolving threats, comply with regulation and build lasting cyber resilience.