Abnormal Security Corp Overview
Pro stress-test →Abnormal Security is an AI-native cloud email security company founded in 2018 by former Google engineers Evan Reiser (CEO) and Sanjay Jeyakumar (CTO), 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. The company has surpassed $100 million in annual recurring revenue, with approximately 1,543 employees as of April 2026.
Strategic Profile
Pro stress-test →In August 2024, Abnormal closed 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. The $5.1 billion valuation positions Abnormal as one of the highest-valued enterprise security unicorns, reflecting enterprise customer demand for AI-native email security that replaces aging signature-based systems. The CrowdStrike Falcon Fund participation provides a strategic partnership signal — Abnormal integrates with CrowdStrike's endpoint detection and response platform.
Competitive Landscape
Pro stress-test →Abnormal competes in cloud email security and AI threat detection against Microsoft Defender for Office 365 (the default Microsoft 365 security layer), Proofpoint (private, Thoma Bravo portfolio), and Mimecast (private, Permira portfolio) for enterprise security spending on email threat protection.
Industry Context
Abnormal Security Corp operates in Cybersecurity Software.
Key facts
Founded: 2018 · Headquarters: San Francisco, US · Employees: 1,543 · Revenue: $100M+ ARR