Abnormal AI

Abnormal AI (formerly Abnormal Security) is an AI-native security company headquartered in San Francisco, California, delivering behavioral AI-powered protection for email, cloud applications, and the modern digital workplace. Founded in 2018, the company raised a $250 million Series D funding round at a $5.1 billion valuation led by Wellington Management, with participation from Greylock Partners, Menlo Ventures, Insight Partners, and the CrowdStrike Falcon Fund, bringing total funding to approximately $580 million.

As of 2025, Abnormal AI has exceeded $200 million in annual recurring revenue with 100%+ year-over-year growth. The company serves over 3,200 organizations across 35 countries, including over 20% of the Fortune 500 and has stopped nearly $1 billion in fraud.

The Abnormal platform uses behavioral AI baselines built from thousands of signals per user to detect business email compromise (BEC), account takeover, supply chain compromise, and AI-generated attacks that bypass traditional secure email gateways and filters. Abnormal AI expanded beyond email in 2025 to cover collaboration tools (Slack, Teams), cloud identity providers, and financial platforms, rebranding from Abnormal Security to Abnormal AI in April 2025.

The company was named to the CNBC 2025 Disruptor 50 list. Abnormal AI integrates with Microsoft 365, Google Workspace, and major SIEM/SOAR platforms, and holds SOC 2 Type II certification.

The company employs approximately 500–700 people globally.