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§ Private Profile · Washington, DC, USA
Sublime Security is a technology company.
Sublime Security offers an adaptive, AI-powered cloud email security platform, combating sophisticated threats like phishing. Its core product enables organizations to deploy custom detection and response rules, providing granular control and real-time protection. The platform blends advanced capabilities with extensive visibility, ensuring effective defense against evolving attack vectors.
Founded in 2019 by CEO Josh Kamdjou and COO Ian Thiel, Sublime Security arose from a critical observation. The founders identified significant shortcomings in existing email security, noting how traditional defenses were often bypassed. This insight motivated the development of a more proactive, customizable, and resilient defense system.
The platform primarily serves enterprises seeking robust, flexible email threat protection. Sublime Security’s vision aims to establish a new standard for email security, stopping more attacks efficiently and reducing operational overhead for security teams. The company is dedicated to continuous adaptation, ensuring its technology remains ahead of emerging threats, providing enduring value.
Sublime Security has raised $240.0M across 4 funding rounds.
Sublime Security has raised $240.0M in total across 4 funding rounds.
Sublime Security has raised $240.0M across 4 funding rounds. Most recently, it raised $150.0M Series C in October 2025.
Sublime Security is an adaptive, AI-powered cloud email security platform designed to prevent threats, respond faster, and reduce manual work for security teams.[1][2][3] It builds autonomous AI agents like the Autonomous Detection Engineer (ADÉ) and Autonomous Security Analyst (ASA) that detect, triage, and adapt to email attacks such as phishing, BEC, and malware, using proprietary Message Query Language (MQL) for transparent, customizable detections.[1][3][5] Serving enterprises like Spotify and Anduril, it solves the problem of legacy email security's slow adaptation by enabling defenses that evolve in hours, not months, with features like backtesting, recursive payload unpacking, and computer vision.[3][4] The company has shown strong growth, raising $9.8M in 2023 and $150M recently to expand its agentic AI platform globally.[4][5]
Founded in Washington, D.C., Sublime Security emerged from founder and CEO Josh Kamdjou's extensive cybersecurity background, including high school work for the DoD and a decade in offensive cyber operations and red teaming where phishing proved the fastest network entry point.[2][1] Motivated to build defenses that could stop such tactics, Josh—holding a B.Sc. in Computer Science from the University of Maryland—launched Sublime to empower defenders with control and transparency.[2] Key early leaders include co-founder Ian, with product and growth experience at Optimizely and Alto, and Colin, former Chief Revenue Officer at Wiz after roles at Duo Security and BigFix.[2]
The idea crystallized into the world's first open email security platform, announced in February 2023 with general availability and $9.8M in seed funding led by Decibel Partners and Slow Ventures.[5] Early collaboration with top security teams refined MQL, a universal DSL for email threats akin to YARA or Sigma for other domains, marking pivotal traction.[5]
Sublime rides the agentic AI wave in cybersecurity, automating defenses against email—the primary attack vector—amid rising sophisticated threats that outpace traditional gateways.[1][3][4] Timing aligns with AI's maturation for security, enabling "adversary speed" responses as attackers leverage generative tools, while market forces like regulatory demands for transparency and zero-trust favor open platforms over opaque incumbents.[2][5] It influences the ecosystem by pioneering MQL as a standard DSL, fostering collaboration like osquery for endpoints, and empowering SecOps teams to leverage internal context, reducing vendor lock-in.[5] With big-name customers and $150M funding, Sublime accelerates the shift to autonomous, explainable security, challenging legacy players.[4]
Sublime Security is poised to dominate agentic email defense, expanding its AI agent suite and global reach with fresh $150M capital to serve more enterprises amid escalating AI-driven threats.[4][1] Trends like multimodal AI integration and decentralized detection will shape its path, potentially extending beyond email to unified threat platforms. Its influence may evolve by standardizing MQL community-wide, amplifying defender advantages in an arms race where adaptation speed wins—reclaiming control starts with platforms like Sublime that truly empower teams.[5][2]
Sublime Security has raised $240.0M in total across 4 funding rounds.
Sublime Security's investors include Russell Moore, Blu Venture Investors, Decibel Partners, IVP, SNR, Oliver Friedrichs, 01 Advisors, Avenir, Citi Ventures, Index Ventures, Slow Ventures, Costanoa Ventures.