Harmonic Security raises $50M to govern how employees use AI tools

Artificial intelligence security firm Harmonic Security has secured $50 million in funding to enhance its platform designed to monitor employee usage of AI tools in the workplace. The startup's platform scrutinizes all data employees send to AI tools before it reaches the service, utilizing custom small language models to analyze context and provide verdicts in milliseconds.

This technology is particularly effective in detecting issues such as employees accessing AI services through personal accounts. Over the past year, Harmonic has broadened its capabilities to cover desktop AI applications and agentic workflows.

Co-founder and CEO Alastair Paterson noted that every board inquires about AI's value delivery and risk mitigation. Harmonic offers a Usage Intelligence layer that operates in tandem with the same models, enabling leaders to identify profitable AI use cases at both organizational and individual employee levels. The company has already integrated with existing tools used by enterprises, including Cisco Systems' Agent Builder and Anthropic's Claude Compliance API, which provides access to activity logs and conversation content for Claude Enterprise users.

With over 100 customers, including some of the world's largest enterprises, Harmonic has helped secure millions of employee accounts. The new funding, raised in a Series B round led by Crosspoint Capital Partners, will be allocated to bolster engineering and marketing efforts across the U.S. and U.K. The company currently employs over 90 people and expects further growth as the AI market evolves.