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An AI-powered cloud email security platform for enterprises, focused on protecting Microsoft 365 and Google Workspace from BEC and phishing.
Abnormal AI has raised $1.0B across 7 funding rounds.
Key people at Abnormal AI.
Abnormal AI was founded in 2018 by Evan Reiser (Co-Founder) and Sanjay Jeyakumar (Co-Founder).
Abnormal AI has raised $1.0B in total across 7 funding rounds.
San Francisco-based Abnormal AI develops a cloud-native email security platform that utilizes behavioral machine learning to detect anomalies and block advanced socially engineered cyberattacks. Operating on a SaaS subscription model, the enterprise cybersecurity firm serves more than 2,000 corporate customers and generates over $100 million in annual recurring revenue. The growing company employs a workforce of over 500 people to support its cloud collaboration security integrations across various complex enterprise environments. Backed by nearly $550 million in total venture capital funding from lead investors including Wellington Management and Greylock Partners, the enterprise reached a $5.1 billion valuation following its Series D round. Its threat protection software is utilized by large global corporations such as Xerox and Mattel to prevent business email compromise and ransomware incidents. Abnormal AI was officially founded in 2018 by Evan Reiser and Sanjay Jeyakumar.
Key people at Abnormal AI.
Abnormal AI was founded in 2018 by Evan Reiser (Co-Founder) and Sanjay Jeyakumar (Co-Founder).
Abnormal AI has raised $1.0B in total across 7 funding rounds.
Abnormal AI's investors include Wellington Management, Andreessen Horowitz, A'Z Angels, Battery Ventures, Conviction Partners, Cyberstarts VC, Greylock, Index Ventures, Insight Partners, Menlo Ventures, Sweater Ventures, Grant Miller.
Abnormal AI is an AI-native cybersecurity company that builds the Abnormal Behavior Platform, a cloud-native software solution using behavioral AI to detect and stop advanced cyber threats like phishing, social engineering, account takeovers, and business email compromise (BEC).[1][2][3][4] It serves over 3,000 organizations, including more than 20% of the Fortune 500, protecting 20M+ people, mitigating $10B+ in annual risk, and saving 2.8M+ SOC hours in 2024, with a 99% customer recommendation rate and near-99.99% attack stop rate.[1][3][4] The platform analyzes over 45,000 signals to profile normal human behavior and flag anomalies that traditional rules-based or signature-matching tools miss, enabling fast API-based integrations and autonomous decisions.[2][3]
Originally focused on email security, Abnormal AI has expanded to safeguard the entire digital workplace across cloud environments, rebranding from Abnormal Security in April 2025 to emphasize its AI foundation and future innovations like autonomous AI agents for detection, response, and collaboration.[1][4]
Abnormal AI was founded in 2018 by AI experts with roots in advertising technology dating back to 2010, where they developed AI models to analyze massive datasets, detect patterns, and model human behavior in real-time.[1][4] Founders Sanjay (likely Sanjay Jeyakumar, CEO) and others combined "AI insiders" expertise in anomaly detection with a mission to combat cybercrime after recognizing how AI could protect against human-targeted attacks.[1][4] The idea emerged from their hypothesis that behavioral modeling—initially prototyped as "Abnormal AI"—could uniquely stop sophisticated crimes bypassing legacy security.[4]
Early traction came from proving superior precision (99.9%+ vs. industry 77%) in email protection, leading to rapid growth as the only solution blocking all socially engineered emails and remediating compromised accounts.[3][4] By 2025, it had stopped nearly $1B in fraud and earned trust for millions of daily autonomous decisions.[4]
Abnormal AI rides the explosive growth of AI-driven cyber threats, where attackers use generative AI to scale personalized social engineering against humans—cybercrime's weakest link—rendering traditional cybersecurity obsolete.[1][2][4] Timing is ideal amid rising BEC losses ($26B+ per IC3 reports) and cloud migration, as knowledge workers face risks everywhere.[2] Market forces like AI proliferation and regulatory pressures favor its behavioral approach, which stops what others can't, influencing the ecosystem by setting new standards for precision (e.g., protecting 20% of Fortune 500) and inspiring AI integration in security operations.[3][4][6]
It accelerates the shift to autonomous, human-centered defense, partnering with MDR providers like Arctic Wolf to blend AI with expertise, while expanding beyond email to redefine cloud-wide protection.[4][6]
Abnormal AI is poised for hypergrowth, leveraging its AI-native foundation to deploy autonomous agents across the digital workplace, potentially dominating as cybercrime evolves with AI adversaries.[1][4] Trends like agentic AI, zero-trust cloud security, and rising fraud ($10B+ mitigated already) will propel it, with influence expanding through ecosystem integrations and Fortune 500 adoption.[1][4][6] Expect further platform extensions, acquisitions, or IPO as it protects an internet under siege—proving that behavioral AI is the ultimate shield for humans in a post-signature era.[2][4] This positions Abnormal AI not just as a cybersecurity leader, but as a pioneer reimagining safety in an AI-accelerated world.
Abnormal AI has raised $1.0B across 7 funding rounds. Most recently, it raised $250.0M Abnormal Security - Series D in August 2024.
