Nebulock Raises $25M for AI-Powered Threat Hunting

Nebulock Inc. has successfully closed a $25 million Series A funding round, signaling a significant boost for its innovative approach to cybersecurity. The capital infusion, led by FirstMark Capital, with participation from existing investors Bain Capital Ventures, Decibel Partners, Zetta Venture Partners, and Step Function Ventures, will fuel the expansion of its autonomous, "hunt-first" security analytics platform. This strategic move comes as organizations grapple with increasingly sophisticated threats, particularly those enabled by the rapid adoption of enterprise AI.

Founded in 2023, Nebulock differentiates itself by moving beyond traditional, alert-centric security models. The company's platform leverages artificial intelligence to proactively identify threats by analyzing sequences of activity across various data sources, including endpoint, identity, cloud, network, and SaaS telemetry. This "hunt-first" methodology aims to uncover "green flags" – subtle, malicious activities that appear benign when viewed in isolation but reveal a pattern of compromise over time. This is particularly relevant in an era where legitimate AI agents can be misused or compromised, creating novel attack vectors.

The effectiveness of Nebulock's strategy is underscored by its impressive early traction. Since its public debut less than a year ago, the platform has conducted over 300 million agentic investigations and generated more than 4,000 high-confidence findings. This track record has attracted a diverse clientele, including prominent firms like Cribl Inc., HealthEdge Software Inc., and Bain Capital LP, alongside major enterprises in the financial services, healthcare, and technology sectors. The company's ability to detect threats, such as the widespread events associated with the OpenClaw incident earlier this year, before they escalate into full-blown incidents, highlights its value proposition.

To further enhance its capabilities, Nebulock has simultaneously launched new features designed to address emerging security challenges. These include advanced tools for insider risk, which consolidate disparate user and AI agent activities into a unified monitoring entity, and enhanced correlation engines that link seemingly unrelated signals from across an organization's infrastructure. A new Command Center view provides security teams with actionable intelligence, guiding their hunting efforts and identifying critical coverage gaps, even within existing SIEM systems.

The cybersecurity market is experiencing a significant shift, with the global cybersecurity market projected to reach over $300 billion by 2026, driven by escalating cyber threats and digital transformation initiatives. Nebulock's focus on proactive, AI-driven threat hunting addresses a critical need for more intelligent and efficient security operations. The company's founder and CEO, Damien Lewke, emphasized the platform's goal to democratize expert threat hunting, removing the need for extensive headcount, lengthy integration periods, and fragmented toolsets.

With this latest funding, Nebulock has raised a total of approximately $33.5 million, building on its initial $8.5 million seed round in July 2025. The substantial Series A investment positions Nebulock to significantly scale its operations, further develop its technology, and solidify its presence as a leader in the next generation of cybersecurity analytics.