Sublime Security Raises $150M Series C to Expand Agentic AI Email Security

Why It Matters

The infusion of capital positions Sublime Security to scale its AI‑powered email protection at a time when enterprises are seeking advanced defenses against sophisticated phishing attacks, potentially reshaping the competitive landscape of the cybersecurity market.

Deal Summary

Sublime Security, a Washington, DC-based agentic email security platform, raised $150M in a Series C round led by Georgian with participation from Avenir, 01A and existing backers Index Ventures, IVP, Citi Ventures and Slow Ventures. The company will use the capital to accelerate its agentic AI capabilities and global growth.