Harmonic Security raises $50M Series B

Harmonic Security, a workforce AI security platform, announced a $50 million Series B led by Crosspoint Capital Partners with participation from existing investors. That brings total funding to $76 million. It competes directly with MIND and Cyberhaven on controlling sensitive data going into generative AI tools. (Disclaimer: I work at Cyberhaven.)

The product covers real-time discovery, classification, and control of how employees actually use AI, across browser-based AI, desktop AI apps, and more and more agentic workflows. Traditional DLP often misses this. Harmonic uses small language models to classify sensitive data in context, so security teams can see what kind of data is going into which AI tools and use lighter controls in place of blanket bans.

Harmonic lists more than 100 companies as customers, with coverage reportedly reaching millions of employees. That’s pretty big for a company at this stage, and it suggests real enterprise use and not just pilots. It also shows that GenAI data controls are now a normal part of data protection budgets.

Investors clearly still like GenAI data governance, even with a lot of well-funded competitors going after shadow AI, data leaking through prompts, and agent workflow risk.