Abnormal AI
Funding History
| Secondary Market (Nasdaq Private Market Estimate) · 08/2026 | $19.98 |
|---|
About
Abnormal AI (formerly Abnormal Security) builds a behavioral AI-native security platform that models the identity, behavior, and relationships of every employee, vendor, and application within an organization to detect and stop email- and identity-based attacks such as phishing, business email compromise, and account takeover that bypass traditional secure email gateways.
- CEO
- Evan Reiser
- Headquarters
- San Francisco, California
- Founded
- 2018
- Website
- Abnormal.ai
Overview
Abnormal AI (formerly Abnormal Security) is a San Francisco-based cybersecurity company that provides a behavioral AI-native email and identity security platform used to detect and stop socially-engineered attacks such as phishing, business email compromise, and account takeover that evade traditional secure email gateways.
Founded in 2018 by Evan Reiser and Sanjay Jeyakumar, the company rebranded from Abnormal Security to Abnormal AI in 2025 as it expanded beyond email into a broader behavioral security platform covering identity, SaaS applications, and AI agents.
Abnormal AI has raised more than $530 million in disclosed venture funding across four priced rounds (with the company's own release citing total expected proceeds of $546 million, a figure that includes participation beyond the four individually disclosed round amounts), most recently a $250 million Series D closed in August 2024 at a $5.1 billion valuation, led by Wellington Management with participation from Greylock Partners, Menlo Ventures, Insight Partners, and the CrowdStrike Falcon Fund.
As of 2026 the company remains privately held, with shares trading on private secondary marketplaces including Forge Global and Nasdaq Private Market, and no S-1 filing or confirmed IPO date announced.
Private securities are speculative, illiquid, and involve risk of complete loss of principal. You should be prepared to hold private securities for an extended period; there is no assurance of a secondary market, an IPO, or other liquidity event. You are fully responsible for conducting your own due diligence. Pricing is indicative — nothing here is an offer of securities.