Top 10 European Cybersecurity Companies 2026

Cambridge-based Darktrace has revolutionized cybersecurity with its pioneering AI-driven autonomous defense, utilizing unsupervised machine learning to detect novel threats in real-time. The company, which listed on the London Stock Exchange in 2021, now serves over 10,000 customers across 110 countries. This customer base is significantly larger than WithSecure's 5,000+ enterprise clients. Darktrace's cutting-edge Cyber AI Loop processes an astounding 1 trillion signals daily, allowing it to identify and neutralize attacks with unparalleled speed. For instance, Darktrace AI stops ransomware on average within one second, a response time that is significantly faster than traditional security solutions. Their innovative approach has also been recognized with Darktrace / EMAIL™ being named a Challenger in the first Gartner® Magic Quadrant™ for Email Security Platforms.

Helsinki-based WithSecure, formerly known as F-Secure, strategically spun off its B2B cybersecurity operations in 2022 to focus exclusively on enterprise clients. The company reported €120.2 million in revenue in 2024, serving over 5,000 enterprise clients through its robust Elements cloud platform for endpoint and cloud security. This revenue figure represents a modest decrease of 1% compared to 2023, showcasing a more measured growth trajectory than some of its rapidly expanding counterparts like Darktrace. WithSecure employs 1,700 staff across 25 countries, demonstrating a significant international presence, though its revenue is currently considerably lower than the cybersecurity division of Thales Group, which generates over €1.5 billion annually.

Thales Group, a French defense and technology conglomerate, boasts a formidable cybersecurity division that generates over €1.5 billion annually, establishing it as one of Europe's largest players in the cyber arena. This revenue dwarfs that of individual cybersecurity firms like WithSecure, which reported €120.2 million in 2024. The company's comprehensive Cortex platform delivers advanced data protection, cloud security, and identity management solutions to governments and critical infrastructure across 68 countries. Thales’ commitment to innovation is supported by significant investment, with the group allocating approximately 6% of its revenues to R&D. With a global workforce of 81,000 employees, Thales Group's cybersecurity offerings are a critical component of its broader technological expertise, providing a robust and integrated security approach that few specialized firms can match.

CrowdStrike's EU operations are a cybersecurity powerhouse, with the Falcon platform stopping breaches in a median of just 1 minute from detection – significantly faster than the industry average of 162 hours. This US-founded company has established a substantial European presence, with major R&D hubs in the UK and Germany, and European headquarters in London. CrowdStrike serves an impressive 60% of Fortune 500 companies and generated $619.48 million in revenue from EMEA in fiscal year 2025.

The Swiss-listed Kudelski Group is a prominent player in digital security, with its Nagra cybersecurity arm generating $108.5 million in revenue in 2024, an increase of 1.8% compared to 2023. The company holds over 2,980 patents and patents pending, covering areas like digital security, access control, and rights management, which is a significantly larger intellectual property portfolio than many emerging cybersecurity firms. Kudelski protects content delivery for over 1 billion consumer devices and employs 3,100 people across 25 countries, showcasing its extensive global reach and established market presence.

Paris-based Devoteam Cyber Trust, the specialized cybersecurity arm of the larger Devoteam Group, reported €500 million in cybersecurity revenues in 2025. This makes it a significant contender in the European market, demonstrating a strong focus on digital trust. The firm serves over 100 major EU institutions and corporations, offering essential services such as penetration testing, SOC services, and GDPR/NIS2 compliance. With 10,000 technology specialists across 18 European countries, Devoteam Cyber Trust’s expansive workforce and geographic coverage give it a distinct advantage over smaller, regionally focused competitors.

Oxford-founded Sophos, acquired by Thoma Bravo in 2020 for $3.9 billion, maintains deep European engineering roots and boasts a substantial global footprint, managing security for 600,000 organizations across 150 countries. The company reported over $1 billion in revenue and billings for the three quarters ending December 31, 2025. Its flagship Intercept X endpoint product is a standout, utilizing deep learning to prevent 99.7% of malware, a higher rate than many standard antivirus solutions. Sophos’s annual recurring revenue (ARR) was above $1.2 billion in 2026 with approximately 15% year-over-year subscription growth, positioning it strongly against rivals like Kudelski Group, which saw a 4.8% decrease in cybersecurity revenues in the first half of 2025.

ESET is one of the few independent security pioneers still thriving after 37 years, having earned over 100 consecutive VB100 awards from Virus Bulletin for its NOD32 antivirus engine. In 2024, the Slovakian firm reported €900 million in revenue—an 18% year-on-year increase—and now protects 110+ million users across 200 countries. That user base is more than 15,700 times larger than the 7,000 enterprise customers served by #10 Varonis, illustrating ESET’s unmatched scale in consumer and SMB security. Its cloud‑based detection blocks 300,000 new malware samples daily, and the company invests 12% of revenue back into R&D, ensuring its lightweight, low‑false‑positive detection remains faster than the industry average of 48 hours for zero‑day response.

Varonis Systems delivers Europe’s most deployed data‑centric security platform, analyzing 10 billion events daily to stop insider threats and ransomware before they cause damage. Over 35% of its $520 million annual revenue comes from European enterprise clients, supported by R&D centres in Tel Aviv and offices in London, Paris, and Frankfurt. The platform now protects 7,000+ enterprise deployments across the continent—a focused, high‑value footprint compared to #9 ESET’s 110 million consumer endpoints. Varonis’s automated threat response cuts mean time to containment by 72%, and its data‑classification engine processes 1.8 billion file metadata tags per day. For regulated industries such as finance and healthcare, Varonis reduces audit preparation time from weeks to hours, outperforming the typical rival’s manual approach.