Horizon3.ai
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 equity across 7 priced rounds, employs about 446 people, and is privately held.
updated Sep 9, 2026
Latest Horizon3.ai news and company activity
What Horizon3.ai did, dated — selected moves from the record, one per kind, newest first.
- Sep 2026Feature launchHorizon3.ai Releases NodeZero Rapid Response Test for CVE-2026-85706 GitLab Path Traversal Vulnerability
- Sep 2026Customer winEquipment Rental Company Uses NodeZero to Detect SSH Key Exposure in Real-Time
- Aug 2026Exec changeHorizon3 Names Chad Keefer Vice President of Federal Sales
- Aug 2026Mega roundHorizon3.ai raises $250M Series E
Horizon3.ai Momentum score
77/ 100climbing
Mandos Momentum blends hiring, funding, traffic and sentiment into one score out of 100. The score is free; the pillars behind it unlock in the platform.
Horizon3.ai funding
Horizon3.ai has raised $428.5M in priced equity. Its most recent round was a Series E in August 2026.
- Equity raised
- $428.5M7 priced rounds
- Last round
- Series EAug 2026
Horizon3.ai employees and hiring
Horizon3.ai has about 446 employees, up 5% over the last 30 days, with 59 open roles.
- Employees
- 446
- 30-day change
- +5%
- Open roles
- 59
Horizon3.ai competitors
Security professionals most often compare Horizon3.ai against Novee Security, Armadin, and XBOW on cybersectools.com. 5 more are in the platform, with overlap scoring.
by search demand for comparison pages on cybersectools.com, 90 days
The other 440 data points.
- Funding historyevery round, every investor named
- Headcount growthvelocity, departments, seniority
- Open jobs59 live postings, role mix
- Tech stackframeworks, clouds, security
