How much funding has Horizon3.ai raised?

Horizon3.ai has raised $428.5M in total. Its most recent round was a Series E in August 2026.

How many people work at Horizon3.ai?

About 446, up 5% over the last 30 days, with 59 open roles.

Who are Horizon3.ai's competitors?

Dropzone AI, Red Piranha, and Binary Defense are among the closest in Security Operations. The full competitive set, with overlap scoring, is in the platform.

Horizon3.ai

Security OperationsSan Francisco, United Statesfounded 2019private

Horizon3.ai is a cybersecurity company specializing in Security Operations, founded in 2019 and headquartered in San Francisco, United States. It has raised $428.5M in total funding, employs about 446 people, and is privately held.

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updated Aug 18, 2026

The record

What Horizon3.ai did, dated.

Aug 2026Feature launchHorizon3.ai Releases NodeZero Rapid Response Test for CVE-2026-19478 GitLab Code Injection Vulnerability
Aug 2026PartnershipHorizon3.ai Co-Organizes AIDC'26 Workshop on Agentic AI in Offensive and Defensive Cyber Operations
Aug 2026Mega roundHorizon3.ai raises $250M Series E
Jul 2026Exec changeMatthew Schaner Joins Horizon3.ai as VP of Sales, Americas

Momentum

71, and climbing.

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Products

What Horizon3.ai sells.

In the platform

The other 440 data points.

Funding historyevery round, every lead investor
Headcount growthvelocity, departments, seniority
Open jobs59 live postings, role mix
Tech stackframeworks, clouds, security

Similar in Security Operations

FAQ

Common questions about Horizon3.ai.

How much funding has Horizon3.ai raised?: Horizon3.ai has raised $428.5M in total. Its most recent round was a Series E in August 2026.
How many people work at Horizon3.ai?: About 446, up 5% over the last 30 days, with 59 open roles.
Who are Horizon3.ai's competitors?: Dropzone AI, Red Piranha, and Binary Defense are among the closest in Security Operations. The full competitive set, with overlap scoring, is in the platform.