Horizon3

Overview

San Francisco AI-native cybersecurity company behind nodezero autonomous penetration testing. Founded 2019 by snehal-antani (ex-Splunk CTO) and Anthony Pillitiere (ex-SOCOM). Positions product as authorized “AI Hackers” for continuous production-safe testing.

Recent Developments

• 2026-08-03: $250MSeriesEat\ast \ast >$2B** valuation (from $650MSeriesD);co-ledby[[nightdragon]]andNEA;totalfunding$428.5M (2026-08-03-horizon3-series-e-official)
• Claims 120% YoY ARR growth; 310,000 production tests; FedRAMP High
• International push: Singapore, Australia, deeper EMEA; product: autonomous blue-team remediation agents

Contradiction

Customer counts differ by source: company PR “over 7,000” (2026-08-03-horizon3-series-e-official) vs SiliconANGLE “more than 6,500” (2026-08-03-horizon3-series-e-siliconangle). ARR and “zero disruptions” are vendor metrics.

Related

• nodezero
• nightdragon
• snehal-antani
• autonomous-penetration-testing
• ai-agent-security
• ai-cybersecurity-testing
• zenity

Sources

• 2026-08-03-horizon3-series-e-official
• 2026-08-03-horizon3-series-e-siliconangle