Sublime Security

Sublime Security is a technology company.

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Updated: Feb 17, 2026 ·

Recent News & Mentions

Oct 1, 2025FundingSublime Security - Series C Dec 1, 2024FundingSublime Security - Series B Apr 1, 2024FundingSublime Security - Series A Feb 1, 2023FundingSublime Security - Seed

Financial History

Sublime Security has raised $240.0M across 4 funding rounds. Most recently, it raised $150.0M Series C in October 2025.

Total Raised

$240.0M

Valuation

N/A

Funding Rounds Raised

Date	Round	Other Investors
Oct 1, 2025	$150.0M Series C	Blu Venture Investors, Decibel Partners, IVP, SNR, Oliver Friedrichs
Dec 1, 2024	$60.0M Series B	Blu Venture Investors, Costanoa Ventures, Decibel Partners, IVP, Paladin Capital Group, SNR, Oliver Friedrichs
Apr 1, 2024	$20.0M Series A	Blu Venture Investors, Costanoa Ventures, Decibel Partners, Paladin Capital Group
Feb 1, 2023	$10.0M Seed	Acrobator Ventures, Alumni Ventures, Blu Venture Investors, BoxOne Ventures, Builders VC, Canaan Partners, Cisco Investments, Costanoa Ventures, Decibel Partners, First Round Capital, KRM Interests LLC, Liquid 2 Ventures, Paladin Capital Group, SeaX Ventures, SNR, Sorenson Ventures, Ten Eleven Ventures, Two Bear Capital, WestWave Capital, ZAKA Ventures, Katie Gray, Varsha Rao

Financial History

Sublime Security has raised $240.0M across 4 funding rounds.

Total Raised

$240.0M

Valuation

N/A

Deep Dive

High-Level Overview

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]

Origin Story

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]

Core Differentiators

Agentic AI Automation: AI agents like ADÉ autonomously generate, backtest, and deploy behavioral detections from attack telemetry, refining for precision and adapting faster than attackers, paired with ASA for triage.[1][3]
Open, Transparent Platform: Human-readable MQL enables custom rules, threat hunting, SIEM/SOAR integration, and community sharing across email providers, rejecting black-box vendor models.[2][3][5]
Advanced Threat Coverage: Combines NLP, computer vision, OCR for QR codes, recursive unpacking, and Distributed Detection Model (DDM) for sophisticated phishing, malware, and BEC with low false positives.[3]
Flexible Operating Modes: Supports autonomous defaults for common threats, review/approve workflows, or full custom engineering, fitting team maturity while providing visibility and exclusions.[3]
Developer and Team Experience: Free core deployment, auditable actions, real-time adaptation, and no vendor tickets, backed by investors like Georgian, Index Ventures, and Avenir.[2][4]

Role in the Broader Tech Landscape

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]

Quick Take & Future Outlook

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]

Sources

Frequently Asked Questions

How much funding has Sublime Security raised?

Sublime Security has raised $240.0M in total across 4 funding rounds.

Who are Sublime Security's investors?

Sublime Security's investors include Blu Venture Investors, Decibel Partners, IVP, SNR, Oliver Friedrichs, Costanoa Ventures, Paladin Capital Group, Acrobator Ventures, Alumni Ventures, BoxOne Ventures, Builders VC, Canaan Partners.