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Horizon3.ai

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Horizon3.ai

horizon3.ai
HQ: San Francisco, California, United States
500
Security

Company research

Public company, workplace, funding, and market signals

Updated Aug 16, 2026

Overview

Horizon3.ai is a cybersecurity company that develops autonomous offensive-security technology. Its NodeZero platform continuously and safely simulates real-world attacks, identifies exploitable attack paths, verifies remediation, and helps organizations demonstrate cyber resilience.

Primary product

NodeZero Proactive Security Platform: autonomous penetration testing and security validation across networks, cloud, Kubernetes, Active Directory, endpoints, web applications, and related attack surfaces.

Founded

2019

Headquarters

San Francisco, California, United States

Team size

300-400

Work style

Hybrid

Industry

Cybersecurity

Sub-industry

Offensive security, autonomous penetration testing, exposure management, and security validation

Offices

San Francisco, California, United States
Durham, North Carolina, United States
Amsterdam, Netherlands (EMEA headquarters, opened June 2026)
New York City, United States
Washington, D.C., United States
Chicago, Illinois, United States
Australia and Singapore expansion announced; specific office addresses unavailable

Business model

B2B SaaS
Enterprise software subscriptions
Channel- and partner-led sales
Managed security service provider enablement

Funding

Stage

Series E

Total raised

$428.5M

Latest round

Series E · Aug 2026

Latest amount

$250M

Series E

Aug 2026 · NightDragon and New Enterprise Associates

$250M

Series D

Jun 2025 · New Enterprise Associates

$100M

Series C

Aug 2023 · Craft Ventures

$40M

Series B

Oct 2021 · SignalFire

$30M

Series A

Jun 2021

$8.5M

Seed

Jan 2020

$2.5M

People & investors

Leadership

Snehal Antani

Co-Founder and Chief Executive Officer

Anthony Pillitiere

Co-Founder

Ilya Kirnos

Co-Founder and Director; executive title not publicly confirmed

Torie Runzel

Chief People Officer

Christine Corbett Moran

Vice President of Engineering

Drew Mullen

Vice President, Revenue Operations

Andres Botero

Chief Marketing Officer

Gareth Cox

Vice President of Sales, APJ

Investors

Atreides Management
Craft Ventures
Industry Ventures
New Enterprise Associates (NEA)
NightDragon
Okta Ventures
Prosperity7 Ventures
SignalFire

Work & culture

Public recruiting language emphasizes “learn-it-alls,” mission-driven cybersecurity work, rapid growth, collaboration with offensive-security practitioners, and a channel- and customer-focused operating model. Available employee-review signals are strongly positive, but they should be treated as directional rather than independently audited.

Work style

Hybrid

Compensation

Public evidence indicates favorable employee ratings for compensation, but no reliable company-wide salary bands or equity details were identified. Individual job postings may disclose role- and location-specific compensation.

Benefits

Public career materials indicate a distributed, international workforce and a mix of hybrid and remote roles.
Employee-review signals indexed by Exa show a 5.0/5.0 employer rating based on 84 reviews, including 4.6 for work-life balance, 4.7 for compensation, 4.9 for culture, and 4.9 for career opportunity.
Specific healthcare, retirement, leave, equity, and other benefit-plan details were not publicly verified.

Product & market

Pricing

Quote-based enterprise SaaS; public materials describe NodeZero as a self-service SaaS product, but no public list pricing was found. Partners can package NodeZero with remediation, incident response, vCISO, threat-hunting, and advisory services.

Differentiators

  • —Autonomous, production-safe attack execution rather than vulnerability scanning alone
  • —Prioritizes exploitable attack paths and provides evidence of real impact
  • —Continuous hack-fix-verify workflow with immediate remediation validation
  • —Coverage across internal and external infrastructure, cloud, Kubernetes, Active Directory, endpoints, and web applications
  • —Large proprietary operational data set from hundreds of thousands of production-safe tests
  • —FedRAMP High authorization and support for frameworks and regulations including NIST CSF, HIPAA, SOC 2, GDPR, DORA, and NIS2
  • —Strong channel strategy: the company reported that approximately 90% of business flows through partners in August 2026

Technology

Kubernetes
Terraform
PostgreSQL
MongoDB
Neo4j
Linux
Ubuntu
JavaScript
Python not publicly confirmed
AWS/cloud infrastructure not specifically confirmed as the company’s internal stack
Metasploit
SQLMap
Wireshark
YARA
Datadog
HashiCorp Vault
Salesforce
Jira
Snowflake or equivalent data tooling not publicly confirmed

Customers

National Security Agency (NSA)
Cybersecurity and Infrastructure Security Agency (CISA)
Four Fortune 10 companies
Fortune 100 enterprises
Multinational banks
Major healthcare networks
Pharmaceutical and semiconductor manufacturers
Critical-infrastructure operators
U.S. Defense Industrial Base organizations
Managed security service providers
School districts, manufacturers, financial institutions, defense contractors, and government agencies

Competitors

Cobalt
HackerOne
Bishop Fox and other traditional penetration-testing providers
Pentera
SafeBreach
XM Cyber
Randori
Core Security
NDAY Security
SpartanX.ai and other emerging autonomous-red-team platforms

Scale & contact

Estimated revenue

$30M-$40M annual revenue estimate; separate company-indexed data reported approximately $35.5M annual revenue. The company has publicly emphasized ARR rather than audited revenue.

Estimated monthly visits

123.6K

Traffic estimate as of Jun 2026

Latest news

Horizon3 Invests $20M in Global Partner Ecosystem

Horizon3.ai · Aug 2026

Horizon3 announced a $20 million commitment to channel leadership, enablement, alliances, transaction infrastructure, and partner go-to-market programs. It reported that about 90% of business flows through partners.

Horizon3 hits $2 billion valuation with $250M Series E as AI threats escalate

TechCrunch · Aug 2026

Horizon3 announced a $250 million Series E at a valuation above $2 billion. TechCrunch reported approximately 7,200-7,300 customers, roughly $100 million in ARR in the prior year, international expansion, and backing from returning investors NightDragon and NEA.

Horizon3 Raises $250M Series E at $2B+ Valuation

Horizon3.ai · Aug 2026

The company’s primary announcement says the round was co-led by NightDragon and NEA, with seven new investors and five returning backers. It cites more than 7,000 customer organizations, 120% year-over-year ARR growth, and more than 310,000 production-safe autonomous tests.

Horizon3.ai Opens EMEA Headquarters in Amsterdam

Horizon3.ai · Jun 2026

Horizon3 announced Amsterdam as its EMEA headquarters and reported 283% EMEA team growth over the prior 12 months, with additional hiring planned.

NodeZero: The World’s Most Experienced AI Hacker

Horizon3.ai · Mar 2026

Horizon3 reported 102% year-over-year ARR growth for FY2026, more than 5,200 organizations using NodeZero, 125% net dollar retention, 94% gross dollar retention, and 32% of Q4 bookings originating through channel partners.

About / teamCareersCompany websiteGitHubLinkedIn company pageNewsroomNodeZero productResources and technical contentSnehal Antani LinkedInX
SourcesHorizon3.ai official websiteHorizon3 official Series E announcementHorizon3 NodeZero growth and FY2026 resultsHorizon3 Amsterdam EMEA headquarters announcementHorizon3 partner ecosystem investmentHorizon3.ai LinkedIn company pageHorizon3.ai careersHorizon3.ai NodeZero product pageHorizon3.ai engineering and technical contentHorizon3.ai X accountHorizon3.ai GitHub organizationSEC Form D for 2020 seed financingSEC Form D for 2025 financingTechCrunch Series E coverageTechCrunch Series D coverageBusiness Wire leadership appointments

Jobs and careers at Horizon3.ai

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US, Remote; United States
3mo ago
Remote
Full-time
Apply

Staff Product Designer

Remote
Product
New York City, NY; New York City, NY, United States
3mo ago
Remote
Full-time
Apply

Senior Federal Technical Support Engineer

Remote
Customer
US, Remote; United States
3mo ago
Remote
Full-time
Apply

Senior Commercial Account Executive, DACH

Remote
Sales
Amsterdam, Netherlands
3mo ago
Remote
Full-time
Apply

(Senior) Manager, Commercial Sales, DACH & Eastern Europe

Remote
Sales
Amsterdam, Netherlands
3mo ago
Remote
Full-time
Apply

Senior Commercial Account Executive, France

Remote
Sales
Amsterdam, Netherlands
3mo ago
Remote
Full-time
Apply

Senior Sales Engineer, DACH Channel

Remote
Sales
Germany
3mo ago
Remote
Full-time
Apply

Senior Sales Engineer (Tri-State)

Remote
Sales
US, Remote; United States
3mo ago
Remote
Full-time
Apply

Senior Engineering Manager, Clients Team

Remote
Engineering
US, Remote; United States
3mo ago
Remote
Full-time
Apply

Enterprise Account Executive, Houston

Remote
Sales
Texas
3mo ago
Remote
Full-time
Apply

Mid-Enterprise Account Executive, NorCal

Remote
Sales
California; California, United States
4mo ago
Remote
Full-time
Apply

Mid-Enterprise Account Executive, Northwest

Remote
Sales
Seattle; Seattle, Washington, United States
4mo ago
Remote
Full-time
Apply

Senior Software Engineer, Browser Automation

Remote
Engineering
US, Remote; United States
4mo ago
Remote
Full-time
Apply

Commercial Account Executive, Chicago

Remote
Sales
Chicago, Illinois; United States
4mo ago
Remote
Full-time
Apply

Senior Sales Development Representative, DACH

Remote
Marketing
Amsterdam, Netherlands
4mo ago
Remote
Full-time
Apply

WebApp Offensive Security Software Engineer

Remote
Engineering
US, Remote; United States
4mo ago
Remote
Full-time
Apply

Federal Back-End Engineer

Remote
Engineering
US, Remote; United States
5mo ago
Remote
Full-time
Apply

Enterprise Account Executive, Chicago

Remote
Sales
Chicago, Illinois; United States
6mo ago
Remote
Full-time
Apply

Director of Enterprise Sales, Northeast

Remote
Sales
New York City, NY; New York City, NY, United States
6mo ago
Remote
Full-time
Apply

Regional Sales Manager, Commercial

Remote
Sales
Chicago, Illinois; United States
6mo ago
Remote
Full-time
Apply

Mid-Enterprise Account Executive, Ohio Valley

Remote
Sales
US, Remote; United States
6mo ago
Remote
Full-time
Apply

Commercial Sales Engineer

Remote
Sales
Chicago, Illinois; United States
6mo ago
Remote
Full-time
Apply

Staff Attack Engineer, AI/LLM

Remote
Engineering
US, Remote; United States
6mo ago
Remote
Full-time
Apply

Enterprise Account Executive, NYC

Remote
Sales
New York City, NY; New York City, NY, United States
8mo ago
Remote
Full-time
Apply

Sales Development Representative, Chicago

On-site
Marketing
Chicago, Illinois; United States
11mo ago
On-site
Full-time
Apply

Senior Back End Engineer

Remote
Engineering
US, Remote; United States
1y ago
Remote
Full-time
Apply

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