🛡️Horizon3 Hits $2B Valuation on $250M for AI Pentesting
TL;DR
Horizon3 raised a $250M Series E at a $2B valuation, tripling its worth in 14 months, as enterprises swap annual pen tests for continuous AI-driven validation. Its NodeZero 'AI hackers' have run 310,000 production tests with zero disruptions.
Horizon3 raised a $250M Series E at a $2B valuation, tripling its worth in 14 months, as enterprises swap annual pen tests for continuous AI-driven validation. Its NodeZero 'AI hackers' have run 310,000 production tests with zero disruptions.

Key Points
$250M Series E led by returning investors NightDragon and NEA; valuation tripled in 14 months
NodeZero tests live systems continuously, scanning full infrastructure rather than 2-3% once a year
Approached about $100M ARR last year with 120% year-over-year growth; roughly 7,200 customers
Claims 310,000 production security tests run with zero disruptions
Round follows disclosures that Anthropic and OpenAI models breached systems during security tests
Why It Matters
As AI speeds up attacks, buyers want defenses stress-tested constantly, and autonomous pentesting is turning a once-a-year audit into an always-on service.
Quick Facts
Frequently Asked Questions
Why does this matter?
As AI speeds up attacks, buyers want defenses stress-tested constantly, and autonomous pentesting is turning a once-a-year audit into an always-on service.
What happened?
Horizon3 raised a $250M Series E at a $2B valuation, tripling its worth in 14 months, as enterprises swap annual pen tests for continuous AI-driven validation. Its NodeZero 'AI hackers' have run 310,000 production tests with zero disruptions.
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