Nebulock Raises $25M Series A for AI Threat Hunting
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Nebulock, a Boston, Massachusetts company building an AI native contextual security platform, has raised $25 million in Series A financing. The round was led by FirstMark, with participation from existing investors Bain Capital Ventures, Decibel, Zetta Venture Partners, and Step Function.
The raise brings the company’s total funding to more than $33 million, including an $8.5 million seed round in mid-2025 that helped it emerge from stealth. The new financing comes less than a year after that debut.
Nebulock was founded by former security and product leaders from CrowdStrike, Palo Alto Networks, and Arctic Wolf. Its platform focuses on threat hunting, proactive detection, and behavioral analytics. The approach correlates telemetry across endpoint, identity, cloud, network, and SaaS silos to surface subtle behavioral patterns that legacy alerting and black-box anomaly scoring often miss.
The company says it has earned the trust of Fortune 500 enterprises, organizations in heavily targeted sectors like financial services and healthcare, and fast-growing companies including Cribl, HealthEdge, and Bain Capital. To date its platform has performed more than 300 million agentic investigations and generated over 4,000 high-confidence findings.
The funding lands as enterprises look for security tools that can keep pace with increasingly automated and AI-driven cyber threats.