Abnormal AI
Headquarters
San Francisco, CAFounded
2018CEO / Founder
Evan ReiserEmployees
501-1000Funding
Series D+ — $284MProducts
1 product listedAvg. AI Score
7.9/10Website
abnormal.ai/
Profile updated
About Abnormal AI
Abnormal AI is a cloud-native email security company founded in 2019 by Evan Reiser and Sanjay Jeyakumar, headquartered in San Francisco, California. The company focuses on protecting enterprise email environments from socially engineered attacks, including business email compromise (BEC), credential phishing, and account takeover.
Abnormal's platform uses behavioral AI to establish baselines of normal communication patterns across employees, vendors, and partners, then flags anomalies that indicate malicious activity. The product integrates with Microsoft 365 and Google Workspace via API, requiring no changes to mail routing. The company serves customers across financial services, healthcare, retail, and other sectors, and has disclosed relationships with large enterprises.
Abnormal raised a $210 million Series C round in May 2022 at a $4 billion valuation, led by Insight Partners, bringing total funding to approximately $284 million. Earlier rounds included a $50 million Series B in 2021 and a $24 million Series A in 2020. The company has grown headcount significantly since its founding and employs several hundred people as of 2024.
Specialties
Financials
Dated, source-cited figures. Estimates are marked.
Products by Abnormal AI
All products by Abnormal AI reviewed by our AI panel of experts.
How Our Review Panel Scores Abnormal AI
Six independent reviewer personalities assessed Abnormal AI's product on their own terms. They disagreed by 1.9 points — The Finance Lead was the hardest to convince, The Decision Maker the most positive.
Averaged across 1 reviewed product in our catalog. Scores are out of 10.
Competitive Landscape
Who Abnormal AI competes with, and how they differ.
The largest independent email-security vendor by revenue and reviewer count, competing head-to-head on BEC and phishing detection; sells a broader DLP/insider-threat/archiving suite that Abnormal does not offer natively.
Bundles email security with archiving, continuity and human-risk-management/awareness training into one integrated cyber-resilience suite, versus Abnormal's narrower, API-first behavioral-AI approach to inbound threat detection.
1 product reviewed on TopReviewed
Ships bundled into Microsoft 365 E5 licenses at effectively zero marginal cost, competing on default-install and price advantage rather than detection sophistication; Abnormal is typically deployed as a layered API add-on on top of it.
9 products reviewed on TopReviewed
Applies the same self-learning/anomaly-detection philosophy across network, cloud, OT and endpoint telemetry (not just email) via Darktrace/EMAIL, positioning it as a unified detection platform rather than an email-only point solution.
1 product reviewed on TopReviewedCompany Timeline
Key milestones in Abnormal AI's history, with sources.
- Milestone
Rebrands from Abnormal Security to Abnormal AI
Legal entity renamed from Abnormal Security Corporation to Abnormal AI, Inc.; domain moved to abnormal.ai as the company repositioned as a broader AI-native human-behavior security platform beyond email.
abnormal.ai - Funding
Series D — $250M led by Wellington Management at a $5.1B valuation
Round brought total funding to $546M; company had recently surpassed $200M in ARR with 100%+ YoY growth and 2,400+ customers, including 17% of the Fortune 500.
securityweek.com - Milestone
Surpasses $100M in annual recurring revenue
Reached $100M ARR in four years with 1,300+ customers including Domino's, Mattel and Xerox; CEO Evan Reiser said the company would prepare for an eventual IPO.
finance.yahoo.com - Funding
Series C — $210M led by Insight Partners at a $4B valuation
Greylock Partners and Menlo Ventures also participated. The round valued the then 4-year-old company at $4 billion.
abnormal.ai - Funding
Series B — $50M led by Menlo Ventures
Round brought cumulative funding to $75M, following 3x YoY ARR growth and a tripling of Fortune 500-level customers during 2020.
abnormal.ai - Funding
Series A — $24M led by Greylock Partners; platform launches from stealth
Abnormal Security launched publicly with general availability of its cloud email security platform alongside a $24M Series A led by Greylock Partners.
abnormal.ai - Founded
Abnormal Security founded by Evan Reiser and Sanjay Jeyakumar
Evan Reiser (CEO, ex-Twitter) and Sanjay Jeyakumar (CTO, ex-Google) founded the company in San Francisco to apply behavioral AI to email security.
abnormal.ai
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