Horizon3.ai raises $250M at $2B-plus valuation for autonomous pentesting

Autonomous security solutions startup Horizon3.ai Inc. today announced it has raised $250 million in a Series E round on a valuation of more than $2 billion to build out its sales operation and expand into Australia and Singapore.

Horizon3.ai closed its Series D in June 2025 at a valuation of $650 million.

Horizon3.ai’s NodeZero platform attacks its […]

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