Fundraising Fox
Abnormal Ai
Unicorn · $5.1BSan Francisco, US · Founded 2018 · 13 known investors
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Abnormal is an AI-native cybersecurity company that uses behavioral AI to detect and prevent email-based attacks and anomalous threats. The platform protects enterprises, including over 25% of the Fortune 500, by analyzing human behavior patterns to identify attacks that exploit them.
Founders & leadership
Abnormal Ai was founded in 2018 by Evan Reiser and Sanjay Jeyakumar.
Investors · 13
How we know: Alkeon Innovation's portfolio page · Not right? Tell us
How we know: Artisanal Ventures's portfolio page · Not right? Tell us
How we know: Ballistic Ventures's portfolio page · the VCSheet dataset · Not right? Tell us
How we know: EQUIAM's portfolio page · Not right? Tell us
How we know: Greylock Partners's portfolio page · board seat on SEC Form D · funding news · abnormalsecurity.com · the VCSheet dataset · research · businesswire.com · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: Inflection Ventures's portfolio page · Not right? Tell us
How we know: abnormalsecurity.com · funding news · research · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: Menlo Ventures's portfolio page · a partner's Signal profile · press coverage · funding news · the VCSheet dataset · research · abnormalsecurity.com · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: Rogue Insight Capital's portfolio page · Not right? Tell us
Also in the syndicate · 2
Funding
SEC filings, press & company announcements$306.6M disclosed across 4 of 13 rounds · 2018–2026
- Undisclosed amountSeries DMar 2026Source ↗
- Undisclosed amountSeries DDec 2025Source ↗
- Undisclosed amountSeries DAug 2024 · 2 sources
Wellington Management (lead), CrowdStrike Falcon Fund, Greylock Partners, Insight Partners, Menlo Ventures
Source ↗ - $24MSeries ANov 2019 · 2 sources
Greylock (lead)
Source ↗
▶$209.7MraisedMay 2022 · 18 investors · OtherRule 506(b)
- Asheem ChandnaDirector
- Evan ReiserExecutive Officer, Director
- Saam MotamediDirector
- Venky GanesanDirector
- Sanjay JeyakumarExecutive Officer, Director
- Stephen WardDirector
- Rajiv GuptaDirector
- Offering amount
- $300M
- Amount sold
- $209.7M
- First sale
- Mar 2022
- Incorporated
- Corporation, Delaware, 2018
- Federal exemptions
- 06b
▶$50.5MraisedMar 2021 · 19 investors · OtherRule 506(b)
- Evan ReiserExecutive Officer, Director
- Sanjay JeyakumarExecutive Officer, Director
- Asheem ChandnaDirector
- Saam MotamediDirector
- Venky GanesanDirector
- Rajiv GuptaDirector
- Offering amount
- $60M
- Amount sold
- $50.5M
- First sale
- Oct 2020
- Incorporated
- Corporation, Delaware, 2018
- Federal exemptions
- 06b
▶$22.5MraisedDec 2019 · 7 investors · Other TechnologyRule 506(b)
- Evan ReiserExecutive Officer, Director
- Sanjay JeyakumarExecutive Officer, Director
- Asheem ChandnaDirector
- Saam MotamediDirector
- Offering amount
- $24M
- Amount sold
- $22.5M
- First sale
- Apr 2018
- Incorporated
- Corporation, Delaware, 2018
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Valuation · disclosed
Disclosed eventsSource: SEC prospectus filings, and round valuations the company or its investors disclosed — follow each entry's link for the claim.
Company profile
researched Aug 2026DATA-QUALITY NOTE: This profile (id 10009763) is a duplicate database entry for the same company as profile id 10005564 (Abnormal Security / Abnormal AI, abnormalai.com) — likely representing a different funding-round snapshot or a data-import artifact that used the abnormal.ai domain instead of abnormalai.com. Direct verification (HTTP fetch, Aug 2026) confirms abnormal.ai is the company's live, current official website (title: "Behavioral AI Email Security Platform | Abnormal AI"; footer copyright: "Abnormal AI, Inc."), while abnormalai.com now resolves to a GoDaddy "domain for sale" parked page (confirmed via curl: the site issues a client-side redirect to /lander, which itself returns a GoDaddy forsale.godaddy.com parking redirect). This strongly indicates the company has consolidated its brand onto the abnormal.ai domain (consistent with its April 2025 rebrand from 'Abnormal Security' to 'Abnormal AI') and no longer actively operates abnormalai.com, which appears to have lapsed or been allowed to expire. There is no evidence these are two different companies; all research below (founders, funding, investors, product, customers) describes the single entity that should be reconciled with profile 10005564 in the underlying database, ideally by merging/deduplicating the two rows rather than tracking them as separate portfolio companies.
Abnormal Security (now Abnormal AI) was founded in 2018 by Evan Reiser (CEO) and Sanjay Jeyakumar (CTO), two operators who had spent much of the 2010s building large-scale behavioral AI and machine-learning systems in the adtech industry. Jeyakumar was a founding engineer at TellApart, an e-commerce marketing/adtech company acquired by Twitter for over $500 million, where he later worked on search and Android; Reiser founded and ran AdStack from 2010-2013. Believing that the behavioral-AI techniques they had used to model consumer behavior at scale could be applied to detect the subtle, human-targeted attacks (phishing, business email compromise, account takeover) that traditional signature- and gateway-based security tools missed, they founded Abnormal Security in San Francisco in 2018 — initiated and incubated at Greylock's own offices — and emerged from stealth in November 2019 with a $24 million Series A led by Greylock Partners.
The company grew quickly by building an API-based, behavioral-AI email security product that integrated directly with Microsoft 365 and Google Workspace without requiring MX record changes, differentiating it from legacy secure email gateways. It raised a $50 million Series B in November 2020 (lead: Menlo Ventures, with Greylock participating), taking total funding to roughly $75 million. In 2022, the company closed a $210 million Series C at a $4 billion valuation (lead: Insight Partners, with Greylock Partners and Menlo Ventures participating) after tripling ARR and doubling headcount in the prior year, and it launched its next-generation Integrated Cloud Email Security (ICES) platform. CrowdStrike also made a strategic investment and launched a partnership with Abnormal in March 2023.
Business model
B2B SaaS; sells enterprise cybersecurity subscriptions (per-mailbox/per-seat licensing) primarily to mid-market and large enterprises, delivered via API integrations with Microsoft 365, Google Workspace, and other cloud/identity platforms.
Subscription-based ARR (annual recurring revenue) from enterprise security licenses.
▸Full profile — profile (continued), go-to-market, ownership
Profile (continued)
Abnormal crossed $100 million in ARR in August 2023 (about four years after Series A) and continued to expand its product surface beyond inbound email into cross-application protection (2024), security posture management for Microsoft 365, and — following its April 2025 rebrand from 'Abnormal Security' to 'Abnormal AI' — identity threat protection, AI governance, and 'infiltration prevention' modules alongside an autonomous AI Security Mailbox for SOC teams. In August 2024, the company raised a $250 million Series D led by Wellington Management (with Greylock, Menlo Ventures, Insight Partners and the CrowdStrike Falcon Fund participating) at a $5.1 billion valuation, after surpassing $200 million in ARR while sustaining 100%+ year-over-year growth; total capital raised to date was disclosed as $546 million at that time. No priced round has been publicly announced since (as of August 2026); the company's newsroom in 2025-2026 instead documents certifications (FedRAMP, GovRAMP, IMDA Singapore), product launches (the Attune behavioral foundation model, Identity Threat Protection, AI Governance, Infiltration Prevention), and a partnership with OpenAI announced August 19, 2026.
As of mid-2026, Abnormal AI reports protecting more than 4,500 organizations, including over 25% of the Fortune 500. The company has been named a Leader in Gartner's Magic Quadrant for Email Security Platforms in both 2024 and 2025, has appeared on the Forbes Cloud 100 for three consecutive years (2023-2025), and has made the CNBC Disruptor 50 list three years running (through 2026). It competes primarily with Proofpoint, Mimecast, Microsoft Defender for Office 365, Darktrace, Check Point (Avanan), Sublime Security, Barracuda, and IRONSCALES in the email/behavioral security market. Leadership has evolved substantially since founding: co-founder Sanjay Jeyakumar moved from CTO to a board-member role as Abhi Bagri took over as CTO, and the executive bench has been built out with veterans from Okta, Zoom, Palo Alto Networks, Check Point, MGM Resorts, and Gong, reflecting the company's ambitions as it scales toward a potential future IPO (Wellington Management's Rob Mazzoni referenced the company 'setting its sights on the public market' at the Series D announcement).
Go-to-market
Mid-market and large enterprises across industries (retail, manufacturing, financial services, healthcare, government); more than 25% of the Fortune 500 are customers.
Ownership
private
Compiled by commissioned research from 50 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Founder mafia
3 people who came through Abnormal Ai went on to found or lead other companies.
Related companies · 10
Companies working in the same space as Abnormal Ai.
Customers & partners
Named customers · 23
Relationships the company or its partners disclosed publicly — case studies, joint announcements, press.
Timeline · 35
launches, deals, and filingsAbnormal AI and OpenAI announce a partnership to accelerate secure enterprise AI adoption and strengthen cyber defense.
Abnormal AI and OpenAI announce a strategic partnership to expand Abnormal's use of OpenAI internally and in its products, and to collaborate on new AI-security capabilities; Abnormal joins the OpenAI Daybreak Cyber Partner Program.
Launches three new products: Identity Threat Protection, AI Governance, and Infiltration Prevention.
Launches three new products — Identity Threat Protection, AI Governance, and Infiltration Prevention — to secure the modern identity attack surface.
Recognized on CNBC's Disruptor 50 list for the third year running.
Appoints Stephen Harrison (VP Product, ex-MGM Resorts CISO), Noah Rolff (VP Customer Success, ex-Palo Alto Networks) and John Slavitt (Chief Legal Officer, ex-Check Point GC).
Introduces Attune, its proprietary multimodal Behavioral AI Foundation Model, to combat AI-driven attacks.
Introduces a multimodal AI foundation model unifying identity, context and content signals to combat AI-driven attacks.
Second consecutive year named a Leader, positioned furthest on the Vision axis.
Second consecutive year named a Leader.
Second consecutive year recognized as a Leader, furthest on the Vision axis.
Company changes its public brand name back toward its original 'Abnormal' identity, now as Abnormal AI, reflecting broadened AI-native platform positioning.
Company renames itself Abnormal AI, which it describes as 'returning to' its original AI-centric identity.
Company changes its public brand name to Abnormal AI, reflecting broadened AI-native platform positioning; company shifts primary web presence to the abnormal.ai domain (from abnormalsecurity.com), which is the likely source of this duplicate profile entry.
Lisa Banks (ex-SpotOn CFO, ex-ServiceNow SVP Finance) joins as CFO to help scale the company toward '$1B+ ARR' and 'public company readiness'; Mike Britton promoted from CISO to CIO. Press release dateline shows Las Vegas as new HQ.
First-ever Gartner MQ for the category; Abnormal named a Leader.
Abnormal is recognized for Ability to Execute and placed furthest overall for Completeness of Vision.
First-ever Gartner MQ for the category; Abnormal named a Leader.
Series D led by Wellington Management with Greylock, Menlo Ventures, Insight Partners, and CrowdStrike Falcon Fund participating; surpasses $200M ARR.
Launches autonomous AI-powered solutions to protect humans across everyday applications, not just email.
Smita Sanadhya joins as CFO and Jeff True as Chief Legal Officer.
Abnormal surpasses $100M in annual recurring revenue four years after launch; appoints Michael DeCesare (President) and Maya Marcus (Chief People Officer).
CrowdStrike invests in Abnormal Security and launches a partnership to stop breaches.
CrowdStrike's Falcon Fund makes a strategic investment in Abnormal and the companies launch a technology/XDR partnership.
Series C led by Insight Partners with Greylock and Menlo Ventures participating, after tripling ARR and doubling headcount; launched next-gen ICES platform.
Former Alliance Data security/privacy officer Mike Britton joins as Chief Information Security Officer.
Menlo Ventures leads a $50M Series B, with Greylock participating as an early investor; total funding reaches $75M.
Series B led by Menlo Ventures with Greylock participating; total funding to date ~$75M.
Abnormal Security emerges from stealth with a $24M Series A led by Greylock Partners.
Abnormal Security launches publicly with general availability of its cloud email security platform and a $24M Series A led by Greylock Partners.
Evan Reiser and Sanjay Jeyakumar found Abnormal Security in San Francisco; company initiated and incubated at Greylock's offices per Greylock's own investment writeup.
Evan Reiser and Sanjay Jeyakumar found Abnormal Security, applying behavior-modeling techniques from their ad-tech backgrounds (TellApart/Twitter/Google) to email security.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
Legal entities · 1
corporate structureIn the news
▸Research sources · 50
primary sources listed
- Abnormal AI Expands Leadership Team to Advance Behavioral AI PlatformAbnormal AI · official site
- Abnormal AI Secures Spot on Forbes 2025 Cloud 100 for Third Year RunningAbnormal AI / Forbes · official site
- Abnormal Security Series D — $5.1B ValuationAbnormal AI · official site
- Abnormal Security Expands Executive Team, Appoints Smita Sanadhya as CFO and Jeff True as CLOAbnormal AI · official site
- Abnormal Security Raises $200M+ at a $4B ValuationAbnormal AI · official site
- Abnormal Security Launches with $24M Series A Funding from GreylockAbnormal AI · official site
- Abnormal AI homepageAbnormal AI · official site
- About Abnormal AIAbnormal AI · official site
- Leadership Team | Abnormal AI Executives & FoundersAbnormal AI · official site
- Evan Reiser — Founder & CEO profileAbnormal AI · official site
- Sanjay Jeyakumar — CTO and Co-Founder profileAbnormal AI · official site
- Contact Us / customer quotesAbnormal AI · official site
50 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Abnormal Ai do?
- The Human Behavior AI Security Company
- Who founded Abnormal Ai?
- Abnormal Ai was founded by Evan Reiser, Sanjay Jeyakumar in 2018.
- Who are Abnormal Ai's investors?
- Abnormal Ai's investors include Alkeon Innovation, Artisanal Ventures, Ballistic Ventures, EQUIAM, Greylock Partners, Inflection Ventures, Insight Partners, Menlo Ventures and 3 more.
- How much funding has Abnormal Ai raised?
- Abnormal Ai has disclosed $306.6M raised across 4 of its 13 known rounds.
- Where is Abnormal Ai headquartered?
- Abnormal Ai is headquartered in San Francisco, US.