Abnormal Security vs Fortinet
Side-by-side comparison of AI visibility scores, market position, and capabilities
San Francisco AI email security (private, $5.1B valuation); $250M Series D (Wellington Management), behavioral AI detects novel BEC/phishing in Microsoft 365/Google Workspace competing with Proofpoint and Microsoft Defender.
About
Abnormal Security is a San Francisco, California-based AI-native cloud email security company — founded in 2018 by Evan Reiser (CEO) and Sanjay Jha (CTO), both former Google engineers — using behavioral AI to detect and block business email compromise (BEC), phishing, ransomware, account takeovers, and AI-generated social engineering attacks against enterprise email environments (Microsoft 365, Google Workspace) through approximately 600 employees. The company raised a $250 million Series D funding round at a $5.1 billion valuation, led by Wellington Management with participation from existing investors Greylock Partners, Menlo Ventures, Insight Partners, and the CrowdStrike Falcon Fund — bringing Abnormal's total funding to approximately $580 million. Abnormal Security's approach to email security is fundamentally different from traditional signature and rule-based approaches: rather than scanning emails for known malware hashes or suspicious links against threat databases, Abnormal's AI models each employee's historical communication behavior (who they email, how they write, what times they send messages, what financial requests they make) and flags deviations from established baselines as anomalies requiring investigation — enabling detection of novel BEC attacks that have no prior signature, AI-generated phishing that passes link reputation checks, and vendor invoice fraud that impersonates legitimate suppliers.
Network security leader with $5.3B revenue; custom ASIC-powered FortiGate firewalls, Security Fabric platform, and expanding SASE and OT security offerings.
About
Fortinet is a global leader in network security, providing enterprise firewalls, endpoint protection, network access control, and cloud security products under the FortiGate and Fortinet Security Fabric brand. Founded in 2000 by brothers Ken Xie and Michael Xie and headquartered in Sunnyvale, California, Fortinet pioneered the unified threat management (UTM) appliance category and has grown into one of the largest pure-play cybersecurity companies with approximately $5.3 billion in annual revenue. The company is listed on NASDAQ.
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