Snehal Antani Co-Founded Horizon3 Scores $250M in Series E Funding
Aug 4, 2026 | By Devin Jacobs
SUMMARY
- Horizon3 secured $250 million in Series E funding, co-led by NightDragon and NEA, at a valuation of over $2 billion.
- Horizon3 develops an AI-native cybersecurity platform that autonomously identifies and validates security vulnerabilities through its NodeZero® platform.
- The funding will scale go-to-market operations and support international expansion across Singapore, Australia, and the EMEA region.
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Follow usHorizon3, a San Francisco, CA-based provider of an AI-native proactive security platform, raised $250M in a Series E funding round co-led by NightDragon and NEA, at a valuation of over $ 2 billion.
The round also saw participation from Acrew Capital, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire Ventures, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, and SignalFire.
The company will use the fresh capital to scale its go-to-market operations and expand internationally across Singapore, Australia and EMEA.
Funding Snapshot
| Metric | Details |
|---|---|
| Fundraise Amount | $250 million |
| Funding Round | Series E |
| Valuation | Over $2 billion |
| Company | Horizon3 |
| Sector | Cybersecurity / AI |
| Headquarters | San Francisco, California, US |
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About Horizon3
Horizon3 is an AI-native proactive cybersecurity company developing technology designed to help organizations identify and address security vulnerabilities before attackers can exploit them.
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Its flagship NodeZero® platform autonomously tests an organization's production environment to identify exploitable attack paths and security weaknesses.
Core offerings include:
- Autonomous security testing
- Attack-path discovery
- Vulnerability remediation verification
- AI-powered threat detection
Core Technologies / Products / Services
| Capability/Product | Application/Use Case |
|---|---|
| NodeZero® | Autonomous security testing |
| AI-Powered Attack Simulation | Identifies exploitable attack paths |
| Remediation Verification | Confirms whether security fixes work |
| Honeypot Deployment | Helps detect attackers inside networks |
Leadership Comments
“We invented the concept of AI Hackers and spent six years earning the right to autonomously pentest the most critical and sensitive networks in the world — with no humans in the loop,” said Snehal Antani, Co-Founder and CEO of Horizon3. “Our massive data moat – built on 310,000 tests safely executed in production – combined with thousands of radical champions who love our product, has allowed us to achieve consistent top-tier financial and operational metrics.
“Horizon3 coined the concept of cyber warfare being AI vs. AI, and that future has arrived,” said Dave DeWalt. “Snehal and his team have built an unparalleled proactive security platform that is fundamentally reshaping how the world defends its data. I am thrilled to join the board to help Horizon3 secure the world's most critical infrastructure and enterprises at scale.”
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