Horizon3 raised $250 million in a Series E funding round, tripling the firm’s valuation from $650 million to $2 billion since June 2025.

Cybersecurity startup Horizon3 raised $250 million at a $2 billion valuation as companies want continuous, AI-powered security validation instead of annual pentesting.

Horizon3.ai raises $250M Series E at $2B valuation for its AI-powered NodeZero pentesting platform, signaling a shift with major implications for