19+ Series A Cybersecurity Startups — $528M Raised, $28M Median

Series A cybersecurity in 2025-2026 is shaped by the dual challenge of AI-powered threats and AI-powered defenses. Our dataset tracks 15 Series A cybersecurity companies that raised a combined $528M at a $28M median — 33% above the overall Series A median of $21M, reflecting investor conviction in the category's strong unit economics. Autonomous SOC (Security Operations Center) platforms, AI-powered application security, and identity security are the hottest Series A categories. Companies building security solutions specifically for AI-generated code and AI workloads are attracting premium valuations. The most active investors include Bain Capital Ventures, Accel, and Cyberstarts. For GTM teams, 15 cybersecurity companies with $528M in fresh capital are high-intent buyers of cloud infrastructure, developer tools, and analytics platforms. CISOs and VP of Engineering are the primary purchasers. These companies have above-average technology budgets due to the mission-critical nature of their products — the $28M median budget means they can make meaningful vendor commitments from day one.