Sublime Security Raises $150M to Expand AI Agent Platform

Sublime Security has raised $150 million in Series C funding led by Georgian, with participation from Avenir, 01A, and existing investors including Index Ventures and IVP. The company plans to use the funding to scale its AI agent platform and expand globally. The investment follows rapid growth and increasing enterprise adoption of Sublime’s agentic email security model.

Sublime takes a different approach to email security. Instead of relying on static filters or vendor-defined detection updates, the company uses a team of AI agents that continuously learn and adapt. Each agent is trained for a specific task - from analyzing threats to deploying new defenses - effectively creating an autonomous digital SOC. This model helps organizations respond faster to evolving attacks without waiting for vendor patches or manual rule creation.

The company’s Autonomous Security Analyst (ASA) and Autonomous Detection Engineer (ADÉ) have already shown measurable impact. ASA handles threat triage in seconds, while ADÉ builds and deploys new protections in hours. Together, they’ve reduced manual review workloads and improved detection accuracy, contributing to a reported doubling of recurring revenue in the first half of 2025. Sublime’s customer list includes names like Spotify, Zscaler, Snowflake, and Elastic - a sign that large enterprises are betting on AI-driven defense.

With the new funding, Sublime aims to accelerate the rollout of additional AI agents and strengthen its global presence. The company says it will continue investing in transparency and control features to ensure that security teams can oversee and refine the work of their digital counterparts - a key step in building trust as agentic AI becomes part of day-to-day security operations.