In a world of endless feeds and flashy tech, Sublime Security is protecting the one space we all still rely on: the inbox, the digital front line no one talks about anymore. In a world where BEC scams alone cost businesses nearly $3B in 2023, Sublime Security is turning chaos into choreography. Founded in 2019 by Joshua Kamdjou & Ian Thiel, this DC-based powerhouse just raised a jaw-dropping $150M Series C led by Georgian, with fresh backing from Avenir & 01A, plus returning believers Index Ventures, IVP, Citi Ventures & Slow Ventures. Total funding now sits at $239.8M, a meteoric climb for a platform that only launched publicly in Feb 2023.
Joshua Kamdjou isn’t your typical founder. He started his cyber career in high school, then spent 10+ years in offensive security for the DoD, learning exactly how the best attackers think. Now he’s building the defenses to outsmart them. His partner, Ian Thiel, brings the product-growth firepower, scaling Optimizely & Alto Pharmacy before co-founding Sublime. Together, they built an email security platform that’s as transparent as it is intelligent, no black boxes, no trust us slogans, just proof you can see, test & deploy.
At the core is MQL, Message Query Language, a purpose-built language that lets defenders write their own detection logic. It’s like giving every security team their own coding canvas. Combine that with AI-driven detection models, behavioral analytics, computer vision & recursive file analysis, and you’ve got a system that doesn’t just stop attacks, it learns, adapts & shares intelligence with the entire community. Sublime even open-sourced hundreds of detection rules on GitHub, letting the world collaborate on defense.
Their results speak louder than any pitch deck: 100% enterprise customer retention, 100% YoY ARR growth in 1H 2025, and a client list that reads like a digital Hall of Fame, Spotify, Snowflake, SentinelOne, Reddit, Brex, Zscaler, ASOS, Ramp, and more. Even wilder? Zero paid ads, zero cold calls. Just product-led momentum. When your AI agents, ASA & ADÉ, triage, hunt, & deploy new detections faster than attackers can blink, word gets around.
This $150M isn’t just fuel, it’s acceleration. Under President Colin Jones, who scaled Wiz from $0 to $250M revenue, and CISO Andrew Becherer, Sublime’s expanding its global footprint, refining its AI agent arsenal & pushing transparency as the new standard in email security. With cybersecurity legend Dmitri Alperovitch on the board & Russell Moore of Georgian leading this latest round, the company’s message is crystal clear: the days of guessing what’s inside your inbox are over.
