Harmonic Security raises $50 million to govern employees’ AI use

Harmonic Security is selling employers two answers: whether employees are using AI safely and whether that use is paying off. On October 14, 2026, it announced a $50 million Series B led by Crosspoint Capital Partners. The money backs a platform that combines checks on employee AI interactions with analysis of workplace use.

Existing investors also participated in the round, which Harmonic said brings its total funding to $76 million. The company plans to spend the new capital on engineering and go-to-market teams in the United States and United Kingdom.

Harmonic says its workforce has passed 90 people across the two countries. It also says more than 100 companies use its platform, covering millions of employees, including staff at some of the world’s largest enterprises. Those figures describe the company’s reported reach, rather than a measurement of how effectively its software prevents data exposure or identifies useful AI work.

The security function starts before an employee’s input reaches an AI tool. Harmonic’s platform inspects what the employee sends, using custom small language models—AI models that read the interaction—to assess its context. SiliconANGLE describes the system as returning a verdict within milliseconds.

The company gives a concrete example of the distinction it wants those models to make. A developer referencing a database schema—the structure of a database—should be able to proceed. Someone pasting live credentials into a chat window should trigger a different judgment. Both interactions can involve technical information, but Harmonic says its models can distinguish the purpose and sensitivity of the content.

Harmonic describes this as classifying sensitive data by context rather than by pattern. Its platform categorizes AI tasks, identifies why the tools are being used and applies controls in real time. The intended distinction is between allowing a legitimate work task and stopping a risky disclosure, rather than treating every interaction containing similar-looking information the same way.

Every board I talk to is asking two questions: how do we reduce the risk of AI use, and are we getting value? Most vendors struggle to answer the first, yet we address both

Alastair Paterson, CEO and co-founder of Harmonic Security

The second part of that pitch uses the same models for a feature Harmonic calls Usage Intelligence. The company says it shows leaders which AI use cases are creating value and which employees have found faster ways to work. It presents that information as a guide to where employers should invest next, not just where security teams should restrict activity.