Security Startups

Sublime Security

Agentic email security with open detection rules and AI that writes new coverage in hours.

Proof of life. Raised $150M Series C led by Georgian, October 2025

About Sublime Security

Sublime sits on Microsoft 365 and Google Workspace via API and lets detection engineers inspect, fork, and publish rules instead of trusting a black box.

Two agents now do the parts vendors used to sit on: one triages inbound mail, the other authors new detections when a novel lure shows up.

The bet is that email defense has to ship like a detection shop, not a quarterly content pack.

Investors

GeorgianIndex VenturesIVPCiti Ventures
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