Abnormal Security
Unicorn · $5.1BLas Vegas, US · Founded 2018 · Delaware corporation · 10 known investors
Abnormal Security is an AI-native cybersecurity company that uses behavioral analysis and machine learning to detect and stop email-based attacks for enterprises. The company serves Fortune 500 organizations and large enterprises seeking AI-driven email security and threat prevention.
Founders & leadership
Abnormal Security was founded in 2018 by Evan Reiser and Sanjay Jeyakumar.
Investors · 10
Also in the syndicate · 1
Funding
SEC filings, press & company announcements$282.6M disclosed across 3 of 10 rounds · 2018–2026
- Undisclosed amountSeries DMar 2026Source ↗
- Undisclosed amountSeries DDec 2025Source ↗
- Undisclosed amountSeries DAug 2024Source ↗
▶$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 2026Abnormal Security (rebranded to 'Abnormal AI' in April 2025, with the company describing this as a 'return' to an original name concept) was founded in 2018 by CEO Evan Reiser and CTO Sanjay Jeyakumar, who according to the company's own launch press release had previously built large-scale machine learning platforms together at TellApart, Twitter and Google. The company's official 'About' page frames the origin story slightly differently/more broadly, saying the founders 'spent years in adtech' beginning in 2010 before applying behavior-modeling techniques to cybersecurity in 2018 -- a Forbes profile similarly describes the founders as coming from 'marketing backgrounds rather than cybersecurity,' applying the behavioral-profiling techniques used by ad-tech companies like Twitter to phishing/BEC detection. The company publicly launched on November 19-20, 2019 with a $24 million Series A round led by Greylock Partners -- Greylock's Asheem Chandna and Saam Motamedi joined the board at that time and remain directors as of August 2026, making Greylock the company's earliest and most consistent institutional backer.
Funding history (all rounds sourced from Abnormal's own newsroom press releases, cross-checked against Crunchbase): $24M Series A (Nov 2019, led by Greylock Partners) → $50M Series B (Nov 19, 2020, led by Menlo Ventures, with Greylock participating as an 'early investor'; brought total funding to $75M) → $210M Series C (May 10, 2022, led by Insight Partners with participation from Greylock Partners and Menlo Ventures, valuing the company at $4 billion) → an undisclosed strategic investment from the CrowdStrike Falcon Fund (announced March 29, 2023, alongside a technology/XDR partnership with CrowdStrike) → $250M Series D (announced Aug 6, 2024, led by Wellington Management with participation from existing investors Greylock Partners, Menlo Ventures, Insight Partners and CrowdStrike Falcon Fund, valuing the company at $5.1 billion; the release states this round brought Abnormal's 'total expected proceeds' to $546 million). Crunchbase lists 5 total funding rounds and roughly 10 total investors, consistent with A/B/C/CrowdStrike-strategic/D. No funding round has been publicly announced since the August 2024 Series D as of this research (checked newsroom press releases through August 19, 2026).
Growth metrics disclosed by the company over time show a clear hyper-growth trajectory: ~1,300 enterprise customers and >$100M ARR in August 2023 (four years after launch); >2,400 organizations and 17% of the Fortune 500, with ARR crossing $200M and 100%+ YoY growth, at the August 2024 Series D; and 3,000+ customers and 20% of the Fortune 500 by January 2025. As of the company's current (August 2026) marketing materials, it says it protects 'millions of people and more than 25% of the Fortune 500.' When CFO Lisa Banks was hired in January 2025 (a Las Vegas-dateline press release, replacing Smita Sanadhya who had joined as CFO only in March 2024), the company explicitly stated her mandate included 'scaling Abnormal to a $1B+ ARR company' and 'supporting Abnormal's growth and scaling the company as it prepares for public company readiness' -- direct, primary-source evidence of IPO intent/preparation, though no IPO has been filed or announced and no specific IPO date/timeline has been disclosed.
Business model
B2B SaaS / cloud-native security platform sold primarily to large and mid-market enterprises via annual subscription (per-employee/per-mailbox pricing), delivered via API integration (no mail-flow/MX changes required), sold both direct and through channel/reseller and technology partners (e.g., Microsoft, CrowdStrike).
Recurring subscription (ARR) revenue for its behavioral AI security platform, with expansion revenue from add-on modules (Account Takeover Protection, AI Security Mailbox, Posture Management, Messaging Security, Identity Threat Protection, AI Governance, Infiltration Prevention, etc.).
▸Full profile — profile (continued), go-to-market, ownership
Profile (continued)
Notably, Abnormal's official press-release datelines shifted from 'SAN FRANCISCO' (used consistently from the November 2019 launch through the August 2024 Series D release) to 'LAS VEGAS' (used from at least the January 2025 CFO-appointment release through the August 2026 OpenAI partnership release), indicating the company relocated its headquarters/registered address from San Francisco, CA to Las Vegas, NV sometime between August 2024 and January 2025. This matches third-party aggregator data (Crunchbase, Forbes) which list Las Vegas, Nevada as current HQ, even though earlier coverage and the company's own 2019-2024 releases described it as San Francisco-based.
Leadership has churned somewhat at the C-suite level even as Reiser and co-founder Jeyakumar have remained constants (Jeyakumar transitioned from day-to-day CTO to a board/co-founder role at some point, with Abhi Bagri now listed as CTO). Notable executive additions/departures found in press releases: Rami Habal (Chief Product Officer, Dec 2019); Kevin Moore (CRO, Apr 2020); Mike Britton (CISO, Apr 2021, promoted to CIO by Jan 2025); Michael DeCesare (President) and Maya Marcus (Chief People Officer), both appointed Aug 2023 alongside the $100M ARR milestone (neither appears on the company's current, Aug 2026 leadership page, suggesting departure or title change not publicly announced); Smita Sanadhya (CFO) and Jeff True (Chief Legal Officer), both appointed March 2024 (also absent from the current leadership page, replaced by Lisa Banks as CFO in Jan 2025 and John Slavitt as CLO by 2026); and in 2026, three more senior hires -- Stephen Harrison (VP Product, New Products; ex-CISO of MGM Resorts), Noah Rolff (VP Customer Success; ex-Palo Alto Networks Cortex), and John Slavitt (Chief Legal Officer; ex-General Counsel of Check Point Software and CLO of Gong).
The company has been consistently recognized as a market leader by Gartner, being named a Leader in the inaugural 2024 Gartner Magic Quadrant for Email Security Platforms (Dec 2024) and again in the 2025 edition (Dec 2025), positioned furthest on the 'Completeness of Vision' axis both times. It has also repeatedly appeared on Forbes Cloud 100, CNBC Disruptor 50 (2024, 2025, 2026), and Fortune AI 50 lists. Its main competitors in the email/cloud security market include legacy secure email gateway (SEG) vendors such as Proofpoint, Mimecast, Barracuda Networks and Fortra (formerly Agari/PhishLabs), cloud-native/AI-based rivals such as Material Security, Sublime Security, Ironscales and Tessian (acquired by Proofpoint in 2023), as well as the built-in email security offered by Microsoft (Defender for Office 365) and Google Workspace -- Abnormal explicitly markets itself as a way to 'displace your SEG.' Strategic technology/investor partnerships include CrowdStrike (2023 investment + XDR/Falcon integration), Microsoft (Intelligent Security Association member; 2022 Microsoft Rising Azure Technology Partner of the Year), and, most recently, OpenAI (announced Aug 19, 2026, expanding Abnormal's internal and product use of OpenAI models and joining the OpenAI Daybreak Cyber Partner Program). Named customers with public case studies on Abnormal's own site include Valvoline, Domino's, Avery Dennison, Ingersoll Rand, TaylorMade, Rate (mortgage lender), JB Poindexter & Co, Save the Children, REA Group, dunnhumby, McLaren Construction Group and others (71 published customer stories as of Aug 2026). No IPO has occurred and no acquisition of Abnormal by another company has been reported; the company remains an independent, private, VC-backed firm as of this research date (Aug 20, 2026).
Go-to-market
Large enterprises and the Fortune 500 (company states it protects more than 25% of the Fortune 500 as of 2026) across financial services, healthcare, manufacturing, retail/hospitality, technology, public sector and education; also mid-market and public-sector/government customers (pursuing FedRAMP/GovRAMP authorizations).
Ownership
private
Compiled by commissioned research from 21 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.
Competitors · 7
by search overlap
Companies competing with Abnormal Security for the same Google search keywords, organic and paid, via search-intersection analysis.
Customers & partners
Named customers · 11
Relationships the company or its partners disclosed publicly — case studies, joint announcements, press.
Timeline · 17
launches, deals, and filingsAbnormal 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 — to secure the modern identity attack surface.
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 a multimodal AI foundation model unifying identity, context and content signals to combat AI-driven attacks.
Second consecutive year recognized as a Leader, furthest on the Vision axis.
Company renames itself Abnormal AI, which it describes as 'returning to' its original AI-centric identity.
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.
Abnormal is recognized for Ability to Execute and placed furthest overall for Completeness of Vision.
Wellington Management leads a $250M Series D, joined by existing investors Greylock, Menlo Ventures, Insight Partners and CrowdStrike Falcon Fund; valuation reaches $5.1B; ARR surpasses $200M with 100%+ YoY growth.
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's Falcon Fund makes a strategic investment in Abnormal and the companies launch a technology/XDR partnership.
Insight Partners leads a $210M Series C, with Greylock Partners and Menlo Ventures participating, valuing Abnormal at $4 billion.
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.
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, 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 · 21
primary sources listed
- About Abnormal AIAbnormal AI · company site
- Leadership Team — Abnormal AI Executives & FoundersAbnormal AI · company site
- Newsroom — Abnormal AI News & Press ReleasesAbnormal AI · company site
- Press ReleasesAbnormal AI · company site
- Customer Stories — Email Security Case StudiesAbnormal AI · company site
21 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Abnormal Security do?
- Behavioral AI that protects email, identity, and AI—and stops insider threats.
- Who founded Abnormal Security?
- Abnormal Security was founded by Evan Reiser, Sanjay Jeyakumar in 2018.
- Who are Abnormal Security's investors?
- Abnormal Security's investors include Alkeon Innovation, Ballistic Ventures, EQUIAM, Inflection Ventures, Insight Partners, Menlo Ventures, Rogue Insight Capital, Wellington Management and 1 more.
- How much funding has Abnormal Security raised?
- Abnormal Security has disclosed $282.6M raised across 3 of its 10 known rounds.
- Where is Abnormal Security headquartered?
- Abnormal Security is headquartered in Las Vegas, US.