Email Security Firm Abnormal Security Raises $210 Million at $4 Billion Valuation

Email security startup Abnormal Security announced today that it has reached a $4 billion valuation after raising $210 million in a Series C investment, which brings the total raised by the AI-focused cybersecurity company to $285 million.

The fresh funding round was led by Insight Partners, with additional investment from Greylock Partners and Menlo Ventures.

Abnormal Security LogoFounded in 2018, and emerging from stealth mode in November 2019, the San Francisco-based firm leverages artificial intelligence to detect abnormal behavior and stop threats such as business email compromise (BEC) before they can reach the inbox.

Its engine analyzes and correlates user behavior, business context, and relationships to prevent socially-engineered attacks, and provides users with transparency on why an email was blocked.

Abnormal Security CEO and co-founder Evan Reiser says the new funds will help the company accelerate product development and invest in growth across Europe, Asia, and Japan.

The company was founded by Reiser and Sanjay Jeyakumar, who serves as CTO. Reiser and Jeyakumar previously worked on the development and operating of Twitter’s ad engine. The Abnormal Security team also includes people who previously worked for Twitter, Google, Amazon, Palo Alto Networks, Proofpoint, FireEye and Duo Security.

The company raised $50 million through a Series B round in late 2020.

Abnormal Security will be participating in SecurityWeek’s Threat Intelligence Summit, taking place next week as a virutal event. 

Related: Zero Trust VPN Company Tailscale Raises $100 Million

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Related: Smallstep Raises $26 Million for Automated Certificate Management Platform

Related: Data Security Firm Veza Emerges From Stealth With $110 Million in Funding

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Ionut Arghire is an international correspondent for SecurityWeek.

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