Top Cybersecurity companies

Companies defending or attacking software, networks, and cloud infrastructure.

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Ranked by current headcount across the largest Cybersecurity companies. Refreshed daily.

1
Palo Alto Networks· Santa Clara, California, United States
Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate. Our mission is to be the cybersecurity partner of choice, protecting our digital way of life. We help address the world's greatest security challenges with continuous innovation that seizes the latest breakthroughs in artificial intelligence, analytics, automation, and orchestration. By delivering an integrated platform and empowering a growing ecosystem of partners, we are at the forefront of protecting tens of thousands of organizations across clouds, networks, and mobile devices. Our vision is a world where each day is safer and more secure than the one before. For more information, visit www.paloaltonetworks.com.
- Series C
- 23.1k employees
- Founded 2005
2
Fortinet· Sunnyvale, California, United States
Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere. This is why the world’s largest enterprises, service providers, and government organizations choose Fortinet to securely accelerate their digital journey.
- Series unknown
- 16.5k employees
- Founded 2000
3
CrowdStrike· Remote, Oregon, United States
CrowdStrike (Nasdaq: CRWD), a global cybersecurity leader, has redefined modern security with the world’s most advanced cloud-native platform for protecting critical areas of enterprise risk — endpoints and cloud workloads, identity and data.Powered by the CrowdStrike Security Cloud and world-class AI, the CrowdStrike Falcon® platform leverages real-time indicators of attack, threat intelligence, evolving adversary tradecraft and enriched telemetry from across the enterprise to deliver hyper-accurate detections, automated protection and remediation, elite threat hunting and prioritized observability of vulnerabilities.Purpose-built in the cloud with a single lightweight-agent architecture, the Falcon platform delivers rapid and scalable deployment, superior protection and performance, reduced complexity and immediate time-to-value.CrowdStrike: We stop breaches.
- Post-IPO equity
- 12k employees
- Founded 2011
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4
NETWORK-SECURITY-SOLUTIONS· Poznan, Wielkopolskie, Poland
We design, secure and operate mission-critical Linux/Unix environments, modern network infrastructures and battle-tested security controls engineered for reliability, scalability and measurable risk reduction.
- 10.4k employees
- Founded 2010
5
Zscaler· San Jose, California, United States
Zscaler (NASDAQ: ZS) is a pioneer and global leader in zero trust security. The world’s largest businesses, critical infrastructure organizations, and government agencies rely on Zscaler to secure users, branches, applications, data & devices, and to accelerate digital transformation initiatives. Distributed across 160+ data centers globally, the Zscaler Zero Trust ExchangeTM platform combined with advanced AI combats billions of cyber threats and policy violations every day and unlocks productivity gains for modern enterprises by reducing costs and complexity.Stay Connected:LinkedIn: https://www.linkedin.com/company/zscalerTwitter: https://www.twitter.com/zscalerFacebook: https://www.facebook.com/Zscaler/Instagram: https://www.instagram.com/zscalerinc/
- Post-IPO debt
- 9.1k employees
- Founded 2008

6
Check Point Software· Redwood City, California, United States
Check Point Software Technologies Ltd. is a leading protector of digital trust, utilizing AI-powered cyber security solutions to safeguard over 100,000 organizations globally. Through its Infinity Platform and an open garden ecosystem, Check Point’s prevention-first approach delivers industry-leading security efficacy while reducing risk. Employing a hybrid mesh network architecture with SASE at its core, the Infinity Platform unifies the management of on-premises, cloud, and workspace environments to offer flexibility, simplicity and scale for enterprises and service providers.
- Post-IPO debt
- 8.6k employees
- Founded 1993
7
Cloudflare· San Francisco, California, United States
Cloudflare, Inc. (NYSE: NET) is the leading connectivity cloud company. It empowers organizations to make their employees, applications and networks faster and more secure everywhere, while reducing complexity and cost. Cloudflare’s connectivity cloud delivers the most full-featured, unified platform of cloud-native products and developer tools, so any organization can gain the control they need to work, develop, and accelerate their business. Powered by one of the world’s largest and most interconnected networks, Cloudflare blocks billions of threats online for its customers every day. It is trusted by millions of organizations – from the largest brands to entrepreneurs and small businesses to nonprofits, humanitarian groups, and governments across the globe.
- Post-IPO debt
- 8.4k employees
- Founded 2009
8
TrendAI· Japan
TrendAITM, a business unit of Trend Micro and global AI security leader, empowers enterprises, governments, and organizations with proactive solutions designed to inspire innovation and eliminate risk.Taking the uncertainty out of security, TrendAITM protects over 25,000 enterprise organizations and millions of individuals across AI, cloud, networks, endpoints, and devices. TrendAI Vision OneTM, the only industry-leading AI security platform that centralizes cyber risk exposure management and security operations across on-premises, hybrid, and multi-cloud environments. Built for the AI age with world-class threat intelligence, TrendAITM enables organizations to reduce cyber risk by 92% and prevent threats three months earlier.With more than 6,000 experts across 75 countries and over 35 years defending the digital frontier and relentless customer support, TrendAITM keeps security leaders, including 70% of Fortune Global 500 companies, ahead of threats, adversaries, and the competition. This includes critical environments like AWS, Google, Microsoft, and NVIDIA. AI Fearlessly.
- 8.1k employees
- Founded 1996
9
Own Company· Englewood Cliffs, New Jersey, United States
Own, now part of Salesforce, offers robust data resilience, compliance, and security solutions. Own's products are trusted by over 7,000 organizations to protect and manage their SaaS data to drive business growth and accelerate Agentforce. Platform support includes Salesforce, ServiceNow®, and Microsoft Dynamics CRM. For more information, visit https://www.salesforce.com/platform/own-integration/.
- Series E
- 7.2k employees
- Founded 2012
10
HackerOne· San Francisco, California, United States
HackerOne is a global leader in Continuous Threat Exposure Management (CTEM) and the only solution provider that pairs the simultaneous trust of the Fortune 500 and the world's largest community of security researchers to secure the AI-native enterprise. The H1 Platform unites agentic AI solutions with security researchers ingenuity to continuously discover, validate, prioritize, and remediate exposures across code, cloud, and AI systems. Through solutions like bug bounty, vulnerability disclosure, agentic pentesting, AI red teaming, and code security, HackerOne delivers measurable, continuous reduction of cyber risk for enterprises. Industry leaders, including Anthropic, Crypto.com, General Motors, Goldman Sachs, Lufthansa, Uber, UK Ministry of Defence, and the U.S. Department of Defense, trust HackerOne to safeguard their digital ecosystems. HackerOne was recognized in Gartner’s Emerging Tech Impact Radar: AI Cybersecurity Ecosystem report for its leadership in AI Security Testing.
- Series unknown
- 7.1k employees
- Founded 2012

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Find engineers and designers at top Cybersecurity companies

The Cybersecurity industry runs on the people who build it. The list above ranks the largest Cybersecurity companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across the 4,129 Cybersecurity companies in Refolk’s index, you’ll find software engineers, ML researchers, designers, founders, and recruiters worth talking to - whether you’re hiring, investing, or doing market research.

Each company on the list is a hub of talent. The biggest Cybersecurity companies tend to attract specialised engineers, while younger ones run on small founding teams and hire generalists. Looking at headcount, last funding round, and HQ location side by side gives you a quick read on where the talent density is highest.

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How this list is built

Refolk pulled the largest companies in Cybersecurity from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Thu, 06 Aug 2026 00:52:05 GMT

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