Evan Reiser

Abnormal Security is an AI-focused cybersecurity company founded in 2018 that specializes in email and cloud security. The company develops AI-powered threat detection systems designed to identify and prevent advanced email attacks, including phishing, business email compromise (BEC), and account takeover attempts. Its core platform uses behavioral AI and machine learning to analyze communication patterns and detect anomalies that traditional security tools miss. The company's technology focuses on cloud email environments, particularly Microsoft 365 and Google Workspace, where it monitors user behavior, message content, and sender patterns in real-time. Abnormal Security has achieved a valuation of $5.1 billion following Series D funding, with total funding of $546 million. The company operates in a competitive landscape alongside established vendors like Proofpoint, Mimecast, and Cisco, as well as emerging AI security startups. Its positioning emphasizes reducing security alert fatigue through AI accuracy while preventing targeted attacks that evade traditional signature-based detection. The company has secured enterprise customers across various industries, though specific customer names are not widely disclosed. Growth trajectory indicates strong market demand for AI-driven email security solutions as organizations face increasingly sophisticated social engineering attacks. Abnormal Security represents the broader shift toward behavioral AI in enterprise security infrastructure. Abnormal Security applies behavioral AI specifically to email security, addressing a historically high-friction attack vector that traditional tools struggle to defend against effectively.