Nebulock Raises $25 Million Series A

Gunderson Dettmer represented Nebulock in its $25 million Series A financing. The round was led by FirstMark with participation from existing investors Bain Capital Ventures, Decibel, Zetta Venture Partners, and Step Function.

Nebulock is an AI-native contextual security platform that helps security teams proactively find, convict, and attribute threats across security stacks. The new capital will be used to expand Nebulock’s platform capabilities, deepen its cross-telemetry correlation and behavioral context graph, and scale engineering and go-to-market teams to meet growing enterprise demand.

“AI is changing both sides of the security equation,” said Damien Lewke, founder and CEO of Nebulock, in the announcement of the transaction.  “The attacker has become more agentic faster than defenders have become proactive. Breaches used to take months; now they take tokens. That’s why Nebulock was built to help security teams move beyond reactive-by-default workflows and toward context-rich, always-on protection that shows them what their stack can’t see.”

The Gunderson deal team was led by Nic Markman and included Amy Luong, Marissa Boykin, and Lizzy Song.