Harmonic Security
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Alastair Paterson
Bryan Woolgar-O'Neil
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2023
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San Francisco, CA
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51-200 Employees
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$17.5M, Series A
Overview
Harmonic Security is an AI governance and control platform giving enterprises visibility and enforcement over how their workforce uses AI as organisations face a growing blind spot that traditional security tooling was never built to address. Harmonic sits directly on the device, governing every interaction in real time.
Key Technology Insights
Harmonic deploys a browser extension, desktop client, and MCP gateway in a single rollout, covering over 1,000 AI surfaces. Rather than matching text strings, it classifies the intent behind each interaction in under 200 milliseconds, distinguishing routine queries from attempts to exfiltrate sensitive data. Responses are graduated, from coaching nudges to warnings to hard blocks, with 40 pre-built industry policy models that activate without training.
Industry Application
Primary uses include preventing leakage of PII, M&A information, and commercially sensitive data into AI tools, cataloguing shadow AI and governing autonomous agent workflows at the MCP layer. It is particularly relevant for financial services, legal, healthcare, and insurance, where GDPR and the EU AI Act are sharpening compliance requirements.
Strategic Perspective
When autonomous agents act without a human in the loop, existing tooling has no line of sight. Organisations that delay establishing a control layer will struggle to demonstrate compliance or attribute data exposure. Beyond risk, Harmonic positions the CISO to answer board-level questions about AI return on investment, framing governance as an enabler that accelerates safe adoption.
