Horizon3 Raises $250M for Cyber Testing
Horizon3 raised $250M at a $2B valuation as enterprises look for continuous ways to test and harden their security posture.
AI is making cyber threats faster, but it is also increasing demand for security platforms that can test defences before attackers do.
What happened
Horizon3 raised a $250 million Series E at a $2 billion valuation. The company builds security-testing software that helps organisations identify weaknesses in their networks and systems before they are exploited.
The round comes as the company approaches roughly $100 million in annual recurring revenue and serves thousands of customers.
Why it matters
This is a strong cybersecurity scaleup signal. Enterprises are no longer treating security testing as an occasional audit. They need more continuous visibility into where systems are exposed, which risks are exploitable and which fixes should be prioritised.
That need becomes more urgent as AI makes attacks easier to automate and scale.
The bigger picture
The cybersecurity market is shifting from passive monitoring toward active validation. Companies want to know not only whether they have security tools installed, but whether those tools actually reduce real attack paths.
Horizon3’s round shows investors are still willing to back cyber platforms that turn security from a checklist into a continuous operating process.