Abnormal Email Security
Identify suspicious messages and signs that a mailbox has been taken over.
Abnormal AI Funding History
Abnormal AI provides AI-based email and behavioral security software targeting business email compromise, account takeover and insider risk.
Company Overview
Founded 2018 · San Francisco, California, US
Official WebsiteAbnormal AI Funding Timeline
Series D
US$250 million · $5.1B valuation
Abnormal said the round would support further investment in its behavioral AI platform. At the time, it was expanding outside the US and pursuing federal authorization.
Led by Wellington Management. Participation included Greylock, Menlo Ventures, Insight Partners.
Source · cooley.com ↗Series C
US$210 million · $4B valuation
Abnormal said the financing would help it add support for more languages and bring new security products to market.
Led by Insight Partners. Participation included Greylock, Menlo Ventures.
Source · abnormal.ai ↗Series B
US$50 million · $500M valuation
Abnormal said the round brought cumulative funding to $75 million as it expanded its enterprise email security business.
Led by Menlo Ventures. Participation included Greylock.
Source · abnormal.ai ↗Series A
US$24 million
Abnormal Security launched its enterprise email protection platform alongside the financing.
Led by Greylock.
Source · abnormal.ai ↗
Abnormal AI Founding Team
Abnormal AI’s founders came from product and engineering work at Twitter. Their company applies behavioral analysis to email attacks such as impersonation and account takeover. The founding team included Sanjay Jeyakumar.
- Evan Reiser — CEO. Previously led product teams at Twitter and TellApart.
Abnormal AI Products
Abnormal AI Company Development
The Mailbox Became One Signal Among Several
In 2024, Abnormal extended account-takeover protection beyond email to identity, collaboration and cloud applications. An investigation that started with an unusual email could now draw on behavior in other systems tied to the same user.
Abnormal AI Competitive Landscape
Account Behavior and Data Exposure
Abnormal AI looks for anomalous behavior in email and accounts, including messages associated with impersonation and account takeover. Cyera starts with sensitive data and the identities that can access it, so its remit is closer to exposure management than email defense.
