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

Hacker hand with key to hacking to victim laptop computer protected with cloud security.Vector illustration cloud computing security design.

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.

Founded 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 operation 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.


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