Sublime Security, a Washington, D.C.–based agentic email security platform, has raised $150 million in Series C funding.
Investors
The round was led by Georgian, with participation from new investors Avenir and 01A, as well as existing backers Index Ventures, IVP, Citi Ventures, and Slow Ventures.
Georgian is a Toronto-based venture capital firm with approximately $5.6 billion in assets under management (AUM). It specializes in late-stage funding (Series B and beyond) for high-growth B2B software companies. The firm’s core investment thesis revolves around businesses that leverage Applied AI in key thematic areas, including the Future of Work, Trust, and Product-Led Growth.
Sublime Security Use of Funds
The fresh funds will be used to advance Sublime’s agentic AI capabilities, enhance its autonomous email defense platform, expand its global presence, and accelerate product innovation to counter next-generation threats.
About Sublime Security
Founded by Josh Kamdjou, Sublime Security is an email security platform that helps organizations stop sophisticated attacks with efficiency and transparency. Its platform deploys specialized AI agents, such as the Autonomous Security Analyst (ASA) and Autonomous Detection Engineer (ADÉ), that detect, triage, and adapt to threats in real-time, minimizing manual workload and response times for security teams. Headquartered in Washington, D.C., Sublime Security serves clients including Spotify, Snowflake, Zscaler, SentinelOne, and British Gas.
Funding Details
Company: Sublime Security, Inc.
Raised: $150.0M
Round: Series C
Funding Date: October 2025
Lead Investor: Georgian
Additional Investors: Avenir, 01A, Index Ventures, IVP, Citi Ventures, Slow Ventures
Company Website: https://sublime.security/
Software Category: Cybersecurity / AI Email Security / Agentic AI
Source: https://www.prnewswire.com/news-releases/sublime-security-raises-150m-in-series-c-funding-as-industry-first-ai-agents-accelerate-growth-302596266.html