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 581 people, and is privately held.
#1Offensive Security Pacesetter· Q3 2026updated Oct 20, 2026
Latest Horizon3.ai news and company activity
What Horizon3.ai did, dated — selected moves from the record, one per kind, newest first.
- Oct 2026RecognitionHorizon3.ai Named Finalist for Two CRN UK Awards
- Oct 2026Funding roundHorizon3 Surpasses $100 Million ARR with 120%+ Growth
- Oct 2026Exec changeEllen Sundra Promoted to Chief Customer Officer at Horizon3.ai
- Sep 2026Feature launchHorizon3.ai Releases NodeZero Rapid Response Test for CVE-2026-86218 N-able N-central RCE
Horizon3.ai Momentum score
89/ 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 products
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 581 employees, up 6% over the last 30 days, with 90 open roles.
- Employees
- 581
- 30-day change
- +6%
- Open roles
- 90
Horizon3.ai competitors
Security professionals most often compare Horizon3.ai against Armadin on cybersectools.com. The full competitive set, with overlap scoring, is in the platform.
ranked by CybersecTools comparison demand, 90 days
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Horizon3.ai CISO Score
How Horizon3.ai reads to a CISO buyer: seven dimensions of the Mandos Framework, scored through the eyes of a security buyer.
