Top California Cybersecurity Startups (170)

The Abnormal Security platform protects enterprises from targeted email attacks. Abnormal Behavior Technology (ABX) models the identity of both employees and external senders, profiles relationships and analyzes email content to stop attacks that lead to account takeover, financial damage and organizational mistrust. Though one-click, API-based Office 365 and G Suite integration, Abnormal sets up in minutes and does not disrupt...

Adaptive is a next-generation cybersecurity platform. We're working with pioneering security teams to protect critical systems from AI-powered cyber attacks. Our customers today include one of the largest payment aggregators in the United States, hedge funds and private equity firms, regional and national banks, leading technology companies, and critical healthcare systems. Join us in building the future of cybersecurity.

The Opal security platform, backed by Greylock, enables organizations to implement least privilege at scale. Through a combination of insights and workflows, Opal decentralizes access management away from overburdened teams. Without using agents or proxies, Opal is deployed on-premise and cloud in minutes. Opal is based in San Francisco and New York. For more information, please visit www.opal.dev or reach...

Release the Cracken. Defend what matters. Cracken is the first Red-AI Copilot built for real offense, not an ordinary CNAPP or endpoint security. We arm defenders with nation-state grade attack logic at machine speed, under full human command. Not black boxes. No fluff. Born on the hardest frontlines of cyber conflict -- Ukraine, US, EU -- Cracken is built by...

Horizon3.ai's mission is to help you find and fix attack vectors before attackers can exploit them. NodeZero, our autonomous penetration testing solution, enables organizations to continuously assess the security posture of their enterprise, including external, identity, on-prem, IoT, and cloud attack surfaces. Like APTs, ransomware, and other threat actors, our algorithms discover and fingerprint your attack surface, identifying the ways...

Stellar Cyber Open XDR platform delivers comprehensive, unified security without complexity, empowering lean security teams of any skill to successfully secure their environments. With Stellar Cyber, organizations reduce risk with early and precise identification and remediation of threats while slashing costs, retaining investments in existing tools, and improving analyst productivity, delivering a 20X improvement in MTTD and an 8X improvement...

BlueRock delivers the first Compute Firewall, revolutionizing runtime security in an era of AI-speed cyberattacks and escalating third-party software risks. Traditional security tools and agents can't keep pace, leaving enforcement gaps exposed. Attackers now exploit vulnerabilities within minutes of disclosure, outpacing reactive detection methods. BlueRock solves this by embedding real-time, preemptive enforcement directly into the compute layer, halting exploits precisely...

Cyolo is redefining SRA for OT with a hybrid Remote Privileged Access Solution (RPAM) solution that provides safe and secure remote access and operations, even in the most sensitive environments. The Cyolo PRO (Privileged Remote Operations) solution seamlessly integrates secure access, connectivity and supervision through features such as VPN-less zero-trust access, MFA identity authentication (even for legacy apps), credentials vault,...

Fortune 500 companies rely on XYPRO to secure their systems. Our diverse 700+ customer base includes the world’s leaders in finance, telecommunications, manufacturing, retail, and government. The XYGATE solution includes risk management, analytics, authentication, privileged privileged access management, auditing and compliance.

Industry’s first Real-time Attack Interception and Defense Platform built to deterministically detect and stop attackers navigating your infrastructure.

In today's world, most successful cyberattacks start by a human failure. We're making the platform that makes it easy to prepare your employees for cyberattacks, in a way they love.

Secureframe is the leading, all-in-one compliance automation platform that helps companies achieve and maintain compliance with the most rigorous frameworks including CMMC, FedRAMP 20x, SOC 2, ISO 27001, and HIPAA.

With our feet firmly planted on San Francisco bedrock — we’ve got our eyes set on our North Star: Ushering in a new era of where enterprises are free to embrace data safely with clarity, control, and confidence. Powered by the industry’s only AI Reasoning (AIR) Engine, Bedrock automatically understands what is most material to enterprises to protect their most...

Organizations of all sizes use AISLE to autonomously discover and remediate critical vulnerabilities at superhuman speed and depth. We secure the entire software stack — from operating systems, libraries, and protocols to the application layer — so teams can build, deploy, and innovate faster and more securely.

Secure code, cloud, and runtime in one central system. Find and fix vulnerabilities automatically, with Aikido AI. Get security done. World-class engineering teams choose Aikido to secure everything they build, host, and run: 1) One platform, total coverage. 2) Automate remediation, end-to-end. 3) Eliminate security debt. Get the fix, not the ticket. Aikido gets developers back to building.

Bee Techy is a top-tier, remote-first software development agency that builds high-quality digital products with precision, speed, and reliability. We specialize in web and mobile development, AI-driven solutions, and end-to-end engineering support for startups and fast-growing companies. Our team delivers clean, scalable, and production-ready systems that help businesses move faster and innovate confidently. As a growing engineering team, we’re actively hiring...

Open Source has become the critical supplier for modern software companies, changing everything about how people think about their code. FOSSA builds the infrastructure for modern teams to be successful with open source. FOSSA's flagship product helps teams track the open source used in their code and automate license scanning and compliance. Since then, over 7,000 open source projects (Kubernetes, Webpack,...

Halcyon is a cybersecurity company building products that stop ransomware from impacting enterprise customers. Halcyon's core platform offers layered ransomware protection that combines pre-execution detection, behavioral modeling, deception techniques and, if all else fails, resiliency, recovery and isolation of impacted nodes. To learn more and get a demo, contact us today.

Innovative IT Solutions Built for Your Business. InterSources Inc is your partner in Growth and CyberSecurity. “We’re building a next-gen Managed Security Services Provider that enables small to mid-sized businesses to access enterprise-grade cybersecurity protection—without the enterprise cost.” “Cyber threats are evolving daily, and most companies don’t have the resources or talent to defend themselves. We offer 24/7 monitoring, threat detection, and...

Proficio is a world-class Managed Security Service Provider (MSSP) providing managed detection and response solutions, 24×7 security monitoring and advanced data breach prevention services to organizations globally. Our rapid growth is being fueled by the rise in cloud-based services, the acceptance of the Software-as-a-Service (SaaS) model, and the increasing number of cyber security attacks on businesses, hospitals and government. We...