Harmonic Security Raises $50M Series B to Govern Enterprise AI Usage

Harmonic Security Inc. announced it raised $50M in an oversubscribed Series B funding round led by Crosspoint Capital Partners LP, bringing the workplace AI security startup's total funding to $76M following a $17.5M Series A led by Next47 in October 2024. The company's platform uses custom small language models to inspect employee interactions with browser-based, desktop, and agentic AI tools in milliseconds—catching risks like pasted live credentials while allowing benign inputs such as database schema references. Alongside startups tracking rogue enterprise agents, Harmonic added a Usage Intelligence layer that lets executives see which AI use cases are paying off down to individual employees, plus integrations with Cisco Systems Inc.'s Agent Builder over Model Context Protocol and Anthropic PBC's Claude Compliance API. Harmonic now serves more than 100 enterprise customers covering millions of employees, employs over 90 staff across the US and UK, and plans to use the new capital to hire additional engineering and go-to-market personnel. "Every board I talk to now wants to know whether AI is delivering value, on top of how to reduce the risk of using it." — Alastair Paterson, Co-founder and CEO of Harmonic Security