Horizon3.ai
Horizon3.ai is a cybersecurity company specializing in Offensive Security, 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 Oct 1, 2026
Latest Horizon3.ai news and company activity
What Horizon3.ai did, dated — selected moves from the record, one per kind, newest first.
- Sep 2026RecognitionHorizon3 Earns Cyber Essentials Plus Certification Covering NodeZero AWS EU Network
- Sep 2026Feature launchHorizon3.ai Releases NodeZero Rapid Response Test for CVE-2026-86218 N-able N-central RCE
- Aug 2026Exec changeHorizon3 Names Chad Keefer Vice President of Federal Sales
- Aug 2026Mega roundHorizon3.ai raises $250M Series E
Horizon3.ai Momentum score
71/ 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 and Armadin on cybersectools.com. The full competitive set, with overlap scoring, is in the platform.
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
