Abnormal Security is an AI-native security company that protects organizations against advanced email and identity-based attacks using behavioral artificial intelligence. The platform models the normal behavior of people and systems across an organization's communication environment, then detects deviations that signal phishing, business email compromise, social engineering, and account takeover.
Rather than relying primarily on known signatures or static rules, Abnormal builds behavioral baselines for users, vendors, and applications. By understanding what normal looks like, the platform can flag attacks that bypass traditional secure email gateways, including socially engineered messages that contain no malware or obviously malicious links.
The company reports that its platform is trusted by thousands of customers, including a significant share of the Fortune 500, and has expanded beyond inbound email protection into account takeover detection, security posture management, and protection for connected cloud collaboration applications.
Abnormal Security has raised substantial venture funding across multiple rounds, with reporting in 2025 describing financing at a multibillion-dollar valuation as the company scaled its AI-native platform and broadened its product portfolio. The funding has supported expansion of its detection capabilities and go-to-market reach across enterprise segments.
The company competes with established email security vendors and secure email gateway providers, as well as the native security controls of large cloud productivity suites. Its differentiation rests on a behavioral AI approach that emphasizes detecting subtle, identity-centric attacks rather than only known threats.
Abnormal Security is best suited to mid-market and enterprise organizations, particularly those on cloud email platforms, that face targeted phishing and business email compromise risk and want layered, AI-driven defense beyond built-in filtering.
