Sublime Security has raised $150m in Series C funding to accelerate the development of its AI-driven capabilities and expand its global reach.
The funding 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.
Sublime Security has carved out a niche in the cybersecurity landscape by offering an intelligent, autonomous defence system powered by specialised AI agents. Unlike legacy solutions that rely on static models, Sublime’s technology adapts in real time to evolving threats. Its AI agents are designed to protect, triage, and adjust defences instantly, reducing the burden on human security teams while improving detection accuracy.
The new capital will be used to strengthen Sublime’s agentic AI platform, develop new autonomous capabilities, and further global expansion. The company plans to build on recent success with the introduction of its first two AI agents: the Autonomous Security Analyst (ASA), which investigates and triages threats within seconds, and the Autonomous Detection Engineer (ADÉ), which creates tailored defences against new attack vectors in just hours.
The company’s rapid innovation has driven substantial growth, with annual recurring revenue doubling in the first half of 2025. Sublime has also maintained 100% enterprise customer retention since its founding, serving major global organisations such as Spotify, Snowflake, Zscaler, Anduril, Centrica, British Gas, Elastic, SentinelOne, and Compass.
Sublime Security CEO and co-founder Josh Kamdjou said, “Our adversaries have constraints, like budgets and time, just like defenders do. AI is changing this dynamic, enabling more sophisticated attacks with less effort at scale. We built Sublime to stop this next generation of attacks by giving security teams an autonomous defence that detects, triages, and adapts at adversary speed, with the transparency and control that enhances work instead of creating friction.”
Georgian partner Russell Moore said, “We believe that Sublime’s use of agentic AI to counter adversaries is redefining how organisations defend themselves – with more context, precision, speed, and transparency than has been possible before. We’re proud to partner with Sublime as it builds the next generation of proactive and programmable autonomous defences.”
Early investor and CrowdStrike co-founder Dmitri Alperovitch added, “Sublime continues to push the boundary of what we think is possible in email security. They are a true industry disruptor, and as they continue to develop new agentic AI capabilities, legacy solutions will struggle to keep pace.”
ASOS chief information security officer Indu Sajeev said, “What makes the biggest difference is that we’re catching more threats with far less manual work. For a team like ours, having an autonomous platform that adapts to new threats is invaluable.”
This latest funding round follows a period of significant momentum for Sublime, reflecting investor confidence in its agentic AI model and potential to reshape the cybersecurity market.
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