Horizon3.ai

What the company sells

Horizon3.ai sells NodeZero, a platform that autonomously executes real attack techniques in production environments so organizations can find exploitable weaknesses, fix them and verify the fixes.

Horizon3.ai describes the problem as one of effectiveness. Its pages say that security teams do not have a tools problem, and that many siloed security tools are not designed to work together. The company says the seams between those tools are blind spots that attackers exploit. Horizon3.ai says knowing a vulnerability exists is not enough and that teams need to know whether it is actually exploitable.

NodeZero is described as an autonomous platform capable of executing self-directed actions to achieve an objective. In pentesting, those objectives include becoming Domain Admin, compromising sensitive data and gaining access to critical systems. Horizon3.ai says NodeZero executes real attack techniques without agents or disruption. Horizon3.ai says its autonomous approach is delivered via multi-tenant SaaS.

Horizon3.ai describes a loop of hack, fix, verify and repeat. Its pages say teams should re-test to confirm a threat is gone after a fix. The company also describes a one-click verify tool in NodeZero that starts a targeted retest.

Endpoint Security Effectiveness shows how endpoint protections respond to real attack behavior, and NodeZero checks for EDR presence on each host. Horizon3.ai also sells pentesting for compliance, delivered by OSCP pentesters together with the NodeZero platform.

The service delivers a Penetration Test Report and a Fix Action Report.

Horizon3.ai says NodeZero serves customers from the Global 100 to a local hospital. Its pages also name banks, healthcare systems, energy providers, manufacturers, governments and defense contractors as organizations that rely on NodeZero.

Horizon3.ai was founded in 2019 and is headquartered in San Francisco, CA. Snehal Antani is its Co-Founder and CEO. The company describes its team as a mix of US Special Operations, US National Security and cybersecurity industry veterans.^{[4][5][6][7][8][9][10]}

Categories

• Breach simulation and automated pen-testing (primary category)
• Compare Horizon3.ai with companies in the same categoryside by side

Headquarters

San Francisco, United States^[1][11]

Founded

2019^[1][11]

Ownership

Privately held^[2][3]

CISO on record

Not yet on our record. Send a verified source

Website

horizon3.ai

Products and services

Product names as the company writes them; what each does, in our words, from the company's own product pages. Never how well it does it.

• NodeZero^{[2][3][5][6][7][8][9][10][14]}

  An autonomous platform that executes real attack techniques in production.

  NodeZero is described as an autonomous platform capable of executing self-directed actions to achieve an objective. Horizon3.ai says it executes real attack techniques without agents or disruption. It is delivered via multi-tenant SaaS.

• Endpoint Security Effectiveness^[3][7]

  Tests how endpoint protections respond to real attack behavior.

  NodeZero checks for EDR presence on each host. It then executes techniques ranging from credential theft to privilege escalation and lateral movement. Every action is mapped to a MITRE ATT&CK TTP and labeled blocked or permitted.

Competitors and alternatives

The other companies on our record filed under the same categories, category by category: first those that lead with that category and share more of Horizon3.ai's categories, then alphabetical. A list from the record, never a ranking.

• On breach simulation and automated pen-testing, Horizon3.ai competes with Armadin, Assail, Cymulate, Fleuret AI, Pentera, Picus Security, Reflex Security, SafeBreach, Tenzai, Terra Security and 16 more.

Recent news

Dated company events from the last twelve months, each in one sentence of ours with its source. Newest first.

• November 5, 2026

  Horizon3 appointed Chris Wood as Director of Sales for Australia and New Zealand and Vivienne Horsfall as Growth Marketing Director for Asia Pacific and Japan. Horizon3^[13]

• July 29, 2026

  Horizon3 announced an expansion of its NodeZero platform to include AI-powered web application pentesting capabilities. Horizon3^[14]

• July 15, 2026

  Horizon3 announced it is taking part in Anthropic's Project Glasswing, an initiative focused on securing critical infrastructure. Horizon3^[12]

References

Every fact above cites one of these by number. Tier A is the company itself, a regulator or a filing; tier B is trade or business press.

1. [1]About usHorizon3.ai · horizon3.ai · undated page, accessed September 27, 2026 · Tier A: the company, a regulator or a filing
2. [2]Horizon3 raises 250m series e at 2b valuation to lead the ai vs ai cybersecurity eraHorizon3.ai · horizon3.ai · published August 3, 2026 · Tier A: the company, a regulator or a filing
3. [3]Home | Horizon3.aiHorizon3.ai · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
4. [4]Why Continuous Exposure Management Matters for Financial ServicesHorizon3.ai · undated page, accessed October 25, 2026 · Tier A: the company, a regulator or a filing
5. [5]The Future of Security: Our Vision | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
6. [6]Compliance Solutions for Cybersecurity | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
7. [7]Endpoint Security Effectiveness | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
8. [8]Identity Security Validation | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
9. [9]Why Our Platform Wins | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
10. [10]HomeECB AI Cybersecurity Mandate | NodeZero® | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
11. [11]The Team | Horizon3Horizon3.ai · undated page, accessed November 5, 2026 · Tier A: the company, a regulator or a filing
12. [12]Horizon3 Joins Anthropic’s Project Glasswing to Help Defend Critical Infrastructure with the Attacker’s PerspectiveHorizon3 · published July 15, 2026 · Tier A: the company, a regulator or a filing
13. [13]Horizon3 Expands Australia and New Zealand Team, Strengthens APJ InvestmentHorizon3 · published November 5, 2026 · Tier A: the company, a regulator or a filing
14. [14]Horizon3’s NodeZero® AI Hacker Extends Production-Safe Autonomous Pentesting to Web ApplicationsHorizon3 · published July 29, 2026 · Tier A: the company, a regulator or a filing

Last verified September 27, 2026. Our code found the quoted passage behind each fact on its source page when the fact was recorded, and re-checks every record against its sources each month.

Recorded September 27, 2026, expanded November 5, 2026 from the references above.

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