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

November 03, 2025
Sublime Security has raised $150 million in Series C funding led by Georgian to accelerate its AI-driven email security capabilities and expand globally.

Washington-based Sublime Security has raised $150 million in Series C funding led by Georgian announced in a press release, with participation from Avenir, 01A, and existing investors Index Ventures, IVP, Citi Ventures, and Slow Ventures.

The company said it will use the investment to expand its AI-native email security platform and enhance its suite of autonomous agents designed to detect and respond to threats in real time. Sublime’s platform employs specialized AI agents that automate protection, triage, and adaptive defense tasks to reduce manual workloads for security teams.

Recent product additions include the Autonomous Security Analyst, which investigates and triages threats in seconds, and the Autonomous Detection Engineer, which deploys new defenses against emerging attacks within hours. Sublime reported 100% growth in annual recurring revenue in the first half of 2025 and has retained all enterprise customers since launch, including Spotify, Snowflake, and Zscaler.

The company plans to use the new funding to further develop its agentic AI capabilities and expand its global operations.

We hope you enjoyed this article.

Consider subscribing to one of our newsletters like AI Funding Brief, Cybersecurity AI Weekly or Daily AI Brief.

Also, consider following us on social media:

AI Funding News Cybersecurity AI AI Brief AI Brief (X)

More from: Funding

11/03
Finster AI Raises $15 Million to Expand Financial Intelligence Platform
11/03
SavvyMoney Raises $225 Million to Expand Financial Wellness Platform
11/03
Commvault Surpasses $1 Billion in Annual Recurring Revenue
11/03
Fireworks AI Raises $250 Million, Reaches $4 Billion Valuation
11/03
Tencent Names 50 Global Finalists for CarbonX 2.0 Climate Tech Program

More from: Cybersecurity

11/03
University of Cape Town and CISPA Partner on Cybersecurity and AI Research
11/03
Legit Security Named to Fortune Cyber 60 for Third Consecutive Year
11/03
Akeyless Introduces AI Agent Identity Security Platform
11/03
OpenText Survey Finds Rising Confidence in Ransomware Recovery Amid Growing AI Threats
11/03
Spektrum Labs Launches Fusion Platform for Provable Cyber Resilience

Subscribe to Cybersecurity AI Weekly

Weekly newsletter about AI in Cybersecurity.

AI Token Webinar

Whitepaper

Stanford HAI’s 2025 AI Index Reveals Record Growth in AI Capabilities, Investment, and Regulation

The 2025 AI Index by Stanford HAI provides a comprehensive overview of the global state of artificial intelligence, highlighting significant advancements in AI capabilities, investment, and regulation. The report details improvements in AI performance, increased adoption in various sectors, and the growing global optimism towards AI, despite ongoing challenges in reasoning and trust. It serves as a critical resource for policymakers, researchers, and industry leaders to understand AI's rapid evolution and its implications.

Read more

You May Also Like