Abnormal Security today announced the close of its Series D funding round, with total expected proceeds of $250 million at a $5.1 billion valuation. The current round brings the total expected proceeds to $546 million and is led by Wellington Management, with participation from existing investors Greylock Partners, Menlo Ventures, Insight Partners and CrowdStrike Falcon Fund. The latest infusion of capital will enable the company to continue its mission of protecting humans from cybercrime through the power of AI, understanding human behavior to detect and prevent today's most dangerous socially-engineered attacks.

Abnormal Security is the leading AI-native human behavior security platform, leveraging machine learning to stop sophisticated inbound attacks and detect compromised accounts across email and connected applications. The anomaly detection engine leverages identity and context to understand human behavior and analyze the risk of every cloud email event-detecting and stopping sophisticated, socially-engineered attacks that target the human vulnerability.