Harmonic Security raises $50 million Series B to govern employee AI tool usage

Oct 14, 2026

On October 14, 2026, Harmonic Security Inc. raised $50 million in an oversubscribed Series B round led by Crosspoint Capital Partners LP, raising total capital to $76 million. The San Francisco and London-based startup uses custom small language models to govern real-time employee AI usage across desktop, browser, and agentic workflows. Protecting millions of users across 100+ enterprises, Harmonic plans to expand its 90-person headcount.

Series B funding details

▪Harmonic Security Inc. plans to use the Series B capital to expand its engineering and go-to-market teams across the United States and the United Kingdom, where its headcount exceeds 90 employees.
▪Harmonic Security Inc. announced an oversubscribed $50 million Series B funding round led by Crosspoint Capital Partners LP on October 14, 2026, with participation from existing investors.
▪The $50 million Series B round brings Harmonic Security Inc.'s total raised capital to $76 million, following a $17.5 million Series A round led by Next47 in October 2024.

Platform governance and security capabilities

▪Harmonic Security Inc. claims its AI security platform produces 96% fewer false positives than traditional enterprise data loss prevention systems.
▪Harmonic Security Inc. extended its governance platform beyond browser-based monitoring to cover desktop AI applications and agentic workflows.
▪Harmonic Security Inc. targets shadow AI risks by inspecting unauthorized AI usage and enforcing real-time controls without requiring prior manual data labeling or classification.
▪Harmonic Security Inc. offers a Usage Intelligence layer that identifies specific AI use cases and employee workflows generating productivity value across an enterprise.
▪Harmonic Security Inc.'s platform uses custom small language models to inspect employee AI interactions in real time, contextually distinguishing sensitive data like live credentials from standard technical queries with approximately 200 milliseconds latency.

Platform integrations

▪Harmonic Security Inc. integrated with Cisco Systems Inc.'s Agent Builder on the Cloud Control platform using the Model Context Protocol.
▪Harmonic Security Inc. integrated with Anthropic PBC's Claude Compliance API to ingest activity logs and conversation content from Claude Enterprise deployments.