companies
Abnormal AI
Behavioral AI platform that models normal communication patterns across email, cloud apps, and identities to stop phishing, BEC, and account takeover.
Abnormal AI, founded in 2018 as Abnormal Security by Evan Reiser and Sanjay Jeyakumar, builds behavioral AI that profiles how people, vendors, and cloud identities normally communicate, then flags deviations rather than hunting for known-bad signatures or links. Both founders came from ad-tech and marketing backgrounds rather than traditional security, which shaped an approach built around statistical modeling of relationships and language instead of static rules. The company raised a $250 million Series D in August 2024 led by Wellington Management at a $5.1 billion valuation, and rebranded from Abnormal Security to Abnormal AI in 2025 as its platform expanded from inbound email defense into account takeover protection, vendor email compromise detection, and behavioral monitoring across Slack, Workday, Dropbox, and AWS identities. It is headquartered in San Francisco and deploys via API integration with Microsoft 365 and Google Workspace rather than as an MX-record mail gateway.
- Founded
- 2018
- Headquarters
- Las Vegas, United States
- Sector
- applications
Tools
- Abnormal Inbound Email Security
AI-based inbound email security that detects BEC, phishing, vendor fraud, and account takeover using behavioral analysis.
- Abnormal Account Takeover Protection
AI security service that detects compromised email and SaaS accounts, investigates takeover activity, and automates account remediation.