Krux
March 14, 2026
Onyx Security Raises $40M for AI Agent Security
Published: March 14, 2026 at 12:38 AM
Updated: March 14, 2026 at 12:38 AM
100-word summary
Onyx Security landed $40M from Conviction Partners and Cyberstarts to build security tools for autonomous AI agents. The startup already has 70+ employees across three countries and claims Fortune 500 customers before even announcing its launch. That's unusual traction for a company going public with its first funding round. The bet: as companies let AI agents book meetings, access databases, and move money without human approval, someone needs to watch what they're doing. Onyx is building the guardrails. The money will fund new AI models and expand the team. Two security-focused VCs leading a $40M round suggests the "let's ship agents fast" phase is over.
What happened
Onyx Security landed $40M from Conviction Partners and Cyberstarts to build security tools for autonomous AI agents. The startup already has 70+ employees across three countries and claims Fortune 500 customers before even announcing its launch. That's unusual traction for a company going public with its first funding round. The bet: as companies let AI agents book meetings, access databases, and move money without human approval, someone needs to watch what they're doing. Onyx is building the guardrails. The money will fund new AI models and expand the team.
Why it matters
Two security-focused VCs leading a $40M round suggests the "let's ship agents fast" phase is over.