Sublime Security
Programmable, AI-agent-assisted email security platform with open detection rules.
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Sublime Security offers an email security platform built around a detection language that lets teams write and share rules, combined with AI agents for triage and investigation of reported messages.
The company raised a $150M Series C in October 2025, led by Georgian, following a $60M Series B in December 2024.
Innovation Matrix Assessment
Rapid product cadence including AI agents for email triage.
Transparent, tunable detections and automated triage help SOC and email teams.
$150M Series C reported by SecurityWeek and VCA Online; total raised above $240M.
Programmable detection and an open rule community differ from black-box secure email gateways.
Customer efficacy evidence is mostly vendor-published; limited independent tests found.
Email stays a leading attack vector, and AI-written phishing raises the stakes.
Why CISOs Should Care
Gives email defenders transparent, customizable detections and automated triage instead of an opaque filter.
What Makes It Different
Detections are expressed as inspectable rules with a community library, and AI agents investigate user reports.
The Matrix Verdict
72/100 — MEANINGFUL INNOVATOR
Sublime is a Meaningful Innovator: a differentiated architecture and strong funding, with efficacy claims still largely self-reported.
Editorial Note: Claims vs. Verified Findings
The 100% ARR growth figure is a company claim. Funding is press-reported. Sacra lists a 2019 founding and Washington HQ.
Sources
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