Harmonic Security
Zero-touch data protection for the GenAI era, using specialized language models instead of manual classification.
About
Harmonic Security, jointly headquartered in London and San Francisco and founded by Digital Shadows veterans Alastair Paterson and Bryan Woolgar-O'Neil, rethinks data protection for generative AI. Instead of complex classification rules and noisy labels, it uses pre-trained specialized language models to identify and safeguard sensitive data, nudging users toward better security practices without disrupting workflows.
It launched in October 2023 with a $7M seed led by Ten Eleven Ventures, then raised a $17.5M Series A in 2024 led by Next47, bringing total funding past $26M. As employees hand work to agentic AI in tools like Claude Code and MCP-connected agents, Harmonic has expanded into agentic governance, giving security teams visibility across browsers, desktops, and the agentic AI layer, stopping risky agent actions and IP leakage to AI providers. In August 2026 it signed a US distribution agreement with Climb for its VAR and MSP network.
What it can do
- Zero-touch data protection via specialized language models
- Visibility and control over agentic AI and MCP usage
- IP-leakage prevention to AI providers at the moment of action
- No manual data classification or rule configuration
- US distribution via Climb VAR/MSP network
Setup
Sign up at harmonic.security; platform deploys across browsers, desktops, and the agentic AI layer.
Prerequisites
Enterprise environment with GenAI tool adoption requiring data protection.
Use cases
Works with
Trust score — 7/10
Scored 7/10 (metrics tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 75; Trending score 70/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.