Top 10 European Cybersecurity Companies 2026

Cambridge-based Darktrace pioneered AI-driven autonomous cyber defence, using unsupervised machine learning to detect novel threats in real time. Listed on the London Stock Exchange in 2021 with a peak valuation of $5 billion, the company now serves 9,000+ customers across 110 countries. Its Cyber AI Loop processes 1 trillion signals daily.

Formerly known as F-Secure, Helsinki-based WithSecure was spun off in 2022 focusing on B2B cybersecurity. The company reported €130 million in revenue in 2024 and serves 5,000+ enterprise clients via its Elements cloud platform for endpoint and cloud security. It employs 1,700 staff across 25 countries.

French defence and technology conglomerate Thales operates a dedicated cybersecurity division generating over €1.5 billion annually, making it one of Europe's largest cyber players. Its Cortex platform provides data protection, cloud security, and identity management to governments and critical infrastructure in 68 countries. Thales employs 81,000 globally.

US-founded but with major European R&D hubs in the UK and Germany, CrowdStrike serves 60% of Fortune 500 companies and has built a €2 billion+ European business. Its Falcon platform, built on cloud-native architecture, stops breaches in an average of 1 minute from detection. European headquarters are in London with 2,000+ EU-based staff.

Swiss-listed Kudelski Group generated CHF 920 million in revenue in 2024, with its cybersecurity arm Nagra providing digital security solutions to media, IoT, and enterprise sectors. The company holds over 1,200 patents and protects content delivery for 1 billion+ consumer devices. It employs 3,100 people across 25 countries.

Paris-based Devoteam is a leading European digital consultancy with a specialised Cyber Trust practice reporting €500 million in cybersecurity revenues in 2025. The firm serves 100+ major EU institutions and corporates with penetration testing, SOC services, and GDPR/NIS2 compliance. It has 10,000 technology specialists across 18 European countries.

Oxford-founded Sophos, acquired by Thoma Bravo in 2020 for $3.9 billion, retains its European engineering roots with 4,000+ employees and $1 billion in annual recurring revenue. Its Intercept X endpoint product uses deep learning to prevent 99.7% of malware. The company manages security for 600,000 organisations across 150 countries.

Founded in Bratislava, Slovakia in 1987, ESET is one of the oldest independent cybersecurity companies globally, protecting 110+ million users across 200+ countries. It reported €900 million in revenues for 2024, growing 18% year-on-year. ESET NOD32 Antivirus has received over 100 consecutive VB100 awards from Virus Bulletin.

While headquartered in New York, Varonis derives over 35% of its $520 million annual revenue from European enterprise clients, with R&D centres in Tel Aviv and offices across London, Paris, and Frankfurt. Its data security platform analyzes 10 billion events daily to prevent insider threats and ransomware. European deployments cover 7,000+ enterprise customers.

Cambridge-based Darktrace pioneered AI-driven autonomous cyber defence, using unsupervised machine learning to detect novel threats in real time. Listed on the London Stock Exchange in 2021 with a peak valuation of $5 billion, the company now serves 9,000+ customers across 110 countries. Its Cyber AI Loop processes 1 trillion signals daily.

Formerly known as F-Secure, Helsinki-based WithSecure was spun off in 2022 focusing on B2B cybersecurity. The company reported €130 million in revenue in 2024 and serves 5,000+ enterprise clients via its Elements cloud platform for endpoint and cloud security. It employs 1,700 staff across 25 countries.

French defence and technology conglomerate Thales operates a dedicated cybersecurity division generating over €1.5 billion annually, making it one of Europe's largest cyber players. Its Cortex platform provides data protection, cloud security, and identity management to governments and critical infrastructure in 68 countries. Thales employs 81,000 globally.

US-founded but with major European R&D hubs in the UK and Germany, CrowdStrike serves 60% of Fortune 500 companies and has built a €2 billion+ European business. Its Falcon platform, built on cloud-native architecture, stops breaches in an average of 1 minute from detection. European headquarters are in London with 2,000+ EU-based staff.

Swiss-listed Kudelski Group generated CHF 920 million in revenue in 2024, with its cybersecurity arm Nagra providing digital security solutions to media, IoT, and enterprise sectors. The company holds over 1,200 patents and protects content delivery for 1 billion+ consumer devices. It employs 3,100 people across 25 countries.

Paris-based Devoteam is a leading European digital consultancy with a specialised Cyber Trust practice reporting €500 million in cybersecurity revenues in 2025. The firm serves 100+ major EU institutions and corporates with penetration testing, SOC services, and GDPR/NIS2 compliance. It has 10,000 technology specialists across 18 European countries.

Oxford-founded Sophos, acquired by Thoma Bravo in 2020 for $3.9 billion, retains its European engineering roots with 4,000+ employees and $1 billion in annual recurring revenue. Its Intercept X endpoint product uses deep learning to prevent 99.7% of malware. The company manages security for 600,000 organisations across 150 countries.

Founded in Bratislava, Slovakia in 1987, ESET is one of the oldest independent cybersecurity companies globally, protecting 110+ million users across 200+ countries. It reported €900 million in revenues for 2024, growing 18% year-on-year. ESET NOD32 Antivirus has received over 100 consecutive VB100 awards from Virus Bulletin.

While headquartered in New York, Varonis derives over 35% of its $520 million annual revenue from European enterprise clients, with R&D centres in Tel Aviv and offices across London, Paris, and Frankfurt. Its data security platform analyzes 10 billion events daily to prevent insider threats and ransomware. European deployments cover 7,000+ enterprise customers.