Top Cybersecurity companies in San Francisco

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

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

We are a crowdsourced security company that safeguards organizations' assets from sophisticated threat actors before they can strike—by uniting our customers with trusted hackers via our AI-powered platform to take back control and stay ahead of attackers. Bugcrowd is backed by Blackbird Ventures, Costanoa Ventures, Industry Ventures, Paladin Capital Group, Rally Ventures, Salesforce Ventures and Triangle Peak Partners.

• Debt
• 3.8k employees
• Founded 2012

Armis, the cyber exposure management & security company, protects theentire attack surface and manages an organization’s cyber risk exposure inreal time.In a rapidly evolving, perimeter-less world, Armis ensures that organizations continuously see, protect and manage all critical assets - from the ground to the cloud. Armis secures Fortune 100, 200 and 500 companies as well as national governments, state and local entities to help keep critical infrastructure, economies and society stay safe and secure 24/7. Armis is now part of ServiceNow. Learn more at servicenow.com.

• Series unknown
• 945 employees
• Founded 2015

Cobalt is the pioneer in pentesting as a service and a leader in offensive security services. We are focused on combining talent and technology with speed, scalability, and expertise. Thousands of customers and hundreds of partners rely on the Cobalt Offensive Security Platform, along with 500+ trusted pentesters, to find and fix vulnerabilities across their environments. By enabling faster pentest launches, real-time collaboration with pentesters, and seamless integration with remediation workflows, we help organizations identify critical issues and accelerate risk mitigation so they can operate fearlessly and innovate securely.

• Series B
• 596 employees
• Founded 2013