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Abnormal AI vs SentinelOne: Founders, CEOs and History

Abnormal AI was founded in 2018 by Evan Reiser, Sanjay Jeyakumar and is led by Evan Reiser. SentinelOne was founded in 2013 by Tomer Weingarten, Almog Cohen and is led by Tomer Weingarten.

Company facts

Abnormal AI

Founded
2018
Headquarters
Las Vegas, Nevada, United States
Current CEO
Evan Reiser
Employees
1,000

SentinelOne

Founded
2013
Headquarters
Mountain View, California
Current CEO
Tomer Weingarten
Employees
2,400

Founders

Abnormal AI

  • Evan Reiser

    Evan Reiser co-founded Abnormal in 2018 and has led it as CEO from its launch through its 2024 Series D at a $5.1 billion valuation and the 2025 rebrand to Abnormal AI.

  • Sanjay Jeyakumar

    Sanjay Jeyakumar co-founded Abnormal in 2018 and was its CTO when the company launched in 2019. Before Abnormal he was the systems architect at Twitter responsible for the distributed data processing and machine learning systems behind Twitter's business.

Abnormal AI founders in full

SentinelOne

  • Tomer Weingarten

    Tomer Weingarten co-founded SentinelOne in 2013 and has served as Chief Executive Officer and Chairman of the Board of Directors since its inception.

  • Almog Cohen

    Almog Cohen co-founded SentinelOne in 2013 alongside Tomer Weingarten, serving as an early technological architect.

SentinelOne founders in full

CEOs and their tenures

Abnormal AI

  1. Evan Reiser2018–present

    Co-founder and Chief Executive Officer

    As CEO, he successfully raised massive venture capital rounds, achieving a $3 billion valuation by proving that traditional rules-based email security was entirely incapable of stopping AI-generated phishing.

    Source
Abnormal AI CEO history in full

SentinelOne

  1. Tomer Weingarten

    Co-Founder, Chief Executive Officer, and Chairman

  2. Barbara Larson

    Chief Financial Officer

  3. Dave Bernhardt

    Former Chief Financial Officer

  4. Almog Cohen

    Co-Founder

  5. Ric Smith

    Former President of Product, Technology, and Operations

SentinelOne CEO history in full

Timeline: Abnormal AI and SentinelOne side by side

  1. 2013SentinelOne

    SentinelOne Founded in Mountain View

    Tomer Weingarten and Almog Cohen found SentinelOne to build autonomous on-agent behavioral cybersecurity.

  2. 2014SentinelOne

    Release of First Autonomous Agent

    Pioneers on-device machine learning models to detect and block zero-day exploits without signature updates.

  3. 2016SentinelOne

    Invention of Automated Ransomware Rollback

    Introduces proprietary Windows VSS integration allowing instant one-click restoration of encrypted files.

  4. 2018Abnormal AI

    Abnormal Founded

    Evan Reiser and Sanjay Jeyakumar start the company in late 2018, incubated at Greylock's offices, under the name Abnormal AI; it soon becomes Abnormal Security.

  5. 2018SentinelOne

    Launch of Storyline Causality Engine

    Releases Storyline technology, autonomously tracking OS-level event trees into causal incident graphs.

  6. 2019Abnormal AI

    Launch With $24M Series A

    Abnormal Security comes out of stealth in November 2019 with a $24 million Series A led by Greylock.

  7. 2020Abnormal AI

    $50M Series B Led by Menlo Ventures

    Abnormal raises a $50 million Series B led by Menlo Ventures in November 2020 after tripling ARR during the year; Forbes reported a valuation above $500 million.

  8. 2020SentinelOne

    Launch of Singularity Platform

    Unifies endpoint detection (EDR), cloud workload protection, and IoT security into a single XDR platform.

  9. 2021SentinelOne

    Record-Breaking NYSE Initial Public Offering

    Completes the largest cybersecurity IPO in Wall Street history under ticker 'S', raising $1.2 billion.

  10. 2021SentinelOne

    Acquisition of Scalyr for $155 Million

    Acquires high-speed cloud log analytics pioneer Scalyr to build the Singularity Data Lake.

  11. 2022Abnormal AI

    $210M Series C at $4B Valuation

    Insight Partners leads a $210 million Series C in May 2022 at a $4 billion valuation, after Abnormal tripled ARR and doubled headcount in 2021.

  12. 2022SentinelOne

    Acquisition of Attivo Networks for $616.5M

    Integrates identity threat detection and response (ITDR) and credential deception into Singularity.

  13. 2023Abnormal AI

    ARR Passes $100M

    Abnormal says in August 2023 that ARR has passed $100 million and hires former Forescout CEO Michael DeCesare as president.

  14. 2023SentinelOne

    Unveils Purple AI Generative Copilot

    Pioneers the cybersecurity industry's first embedded generative AI natural language security analyst.

  15. 2024Abnormal AI

    $250M Series D at $5.1B Valuation

    Wellington Management leads a $250 million Series D in August 2024 at a $5.1 billion valuation; ARR has passed $200 million and customers exceed 2,400.

  16. 2024SentinelOne

    Revenue Exceeds $621M with Positive Free Cash Flow

    Generates $621.2M in annual revenue, expands customer base past 11,500, and scales Singularity Cloud.

  17. 2025Abnormal AI

    Rebrand to Abnormal AI

    In April 2025 the company returns to its original name, Abnormal AI, and changes its legal name to Abnormal AI, Inc.

  18. 2025Abnormal AI

    FedRAMP Moderate Authorization

    Abnormal achieves FedRAMP Moderate authorization in April 2025, followed by GovRAMP Moderate authorization in September 2025.

  19. 2025Abnormal AI

    AI Agents and Germany Expansion

    Abnormal launches AI Phishing Coach and AI Data Analyst agents in April 2025 and expands operations into Germany.

  20. 2025SentinelOne

    Acquisition of PingSafe for Cloud Security (CNAPP)

    Acquires CNAPP innovator PingSafe to deliver unified agentless and agent-based cloud defense.

  21. 2026Abnormal AI

    Attune 1.0 Behavioral Model

    Abnormal reports more than 4,500 customers, including over 25% of the Fortune 500, and the launch of Attune 1.0, a behavioral foundation model.

  22. 2026Abnormal AI

    Anthropic Logo Lawsuit

    Anthropic sues Abnormal in July 2026, alleging its 2025 logo copies Anthropic's branding.

  23. 2026Abnormal AI

    Identity and AI Security Products

    In July 2026 Abnormal launches Identity Threat Protection, AI Governance and Infiltration Prevention.

  24. 2026Abnormal AI

    OpenAI Partnership

    Abnormal and OpenAI announce a partnership in August 2026; Abnormal joins OpenAI's Daybreak cyber partner program.

  25. 2026Abnormal AI

    SoftBank Resells Abnormal in Japan

    SoftBank Corp. begins offering Abnormal's email security platform to enterprise customers in Japan in September 2026.

  26. 2026Abnormal AI

    AI Security Suite

    In September 2026 Abnormal adds AI Employee Guardrails, AI Agent Security and AI Security Workbench, saying it protects 30% of the Fortune 500.

  27. 2026SentinelOne

    Expands Enterprise Autonomous SOC Ecosystem

    Scales Purple AI across global enterprise SOCs, driving autonomous incident triaging and threat hunting.

Acquisitions

Abnormal AI

No verified acquisitions are listed.

SentinelOne

  • Observo AI2025Undisclosed
  • PingSafe2024$100M
  • Krebs Stamos Group2023Undisclosed
  • Attivo Networks2022$616.5M
  • Scalyr2021$155M
All SentinelOne acquisitions

Questions about Abnormal AI vs SentinelOne

Who is the CEO of Abnormal AI and SentinelOne?

Abnormal AI is led by Evan Reiser and SentinelOne is led by Tomer Weingarten. Both serve as the top executive responsible for the company's strategy, operations, and financial performance.

When was Abnormal AI founded vs SentinelOne?

SentinelOne was founded in 2013 — 5 years before Abnormal AI, which was founded in 2018. SentinelOne's longer operating history gives it a deeper track record but also potentially more institutional inertia compared to the younger Abnormal AI.

How many employees does Abnormal AI have compared to SentinelOne?

Abnormal AI employs approximately 1,000 people, while SentinelOne employs approximately 2,400. SentinelOne has the larger workforce at 2,400 employees, compared to Abnormal AI's 1,000. A higher headcount does not necessarily imply greater efficiency — it often reflects differences in business model (e.g., manufacturing vs. software).

Where are Abnormal AI and SentinelOne headquartered?

Both Abnormal AI and SentinelOne are headquartered in United States. Their local rules and tax obligations may still differ.

Who founded Abnormal AI and SentinelOne?

Abnormal AI was founded by Evan Reiser, Sanjay Jeyakumar. SentinelOne was founded by Tomer Weingarten, Almog Cohen.

Which company has a longer operating history — Abnormal AI or SentinelOne?

SentinelOne has been operating for approximately 13 years, making it the more established of the two companies. Abnormal AI has been in operation for around 8 years. A longer operating history often signals greater institutional resilience and brand recognition, though it can also mean slower adaptation to new market conditions.

Figures come from each company's filings and the sources linked beside them. Amounts reported in another currency are shown in US dollars at an approximate rate and marked with ~. Back to the Abnormal AI vs SentinelOne overview

Content is for informational purposes only. Not financial advice. Data sourced from SEC filings, annual reports, and public records. See our full disclaimer and methodology.