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

Harmonic Security has closed an oversubscribed $50 million Series B round to build out what it calls workforce AI protection. Crosspoint Capital Partners led the round, and existing investors also participated. The pitch is simple. Employees are pasting company information into AI tools, and security teams want to see it, and ideally stop the bad stuff, before it leaves the building. The details of the round The company announced the Series B on October 14, 2026. The new money lifts Harmonic’s total funding to $76 million. Harmonic says the capital will go toward expanding its engineering and go-to-market teams. Headcount has already passed 90 employees, split across the US and the UK. The startup was founded in 2023 and operates out of San Francisco and London. For comparison, Harmonic completed a $17.5 million Series A in late 2024. The Series B is nearly three times that size. On the customer side, Harmonic says its platform covers millions of employees at more than 100 enterprise customers. It has also signed distribution partnerships with Climb Global Solutions and Distology to widen its reach through the channel. What the product actually does Technically, the platform govern...