Harmonic Security Raises $50M Series B to Secure AI Adoption Across Enterprise Workforces

Harmonic Security Secures $50M Series B Funding Led by Crosspoint Capital Partners

Harmonic Security announced a $50 million Series B funding round led by Crosspoint Capital Partners, with participation from existing investors, bringing the company's total funding to $76 million1

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. The oversubscribed round positions the workforce AI security platform to accelerate engineering and go-to-market expansion across the United States and United Kingdom. The company has grown to more than 90 employees and now protects millions of workers at over 100 enterprise customers1

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. Harmonic Security signed new distribution partnerships with Climb Global Solutions and Distology to extend its reach1

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How Harmonic Security Enables Safe AI Adoption Through Real-Time Classification

Harmonic Security stands as the only platform that classifies every AI task, discovers why it is used, and controls it in real time1

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. The platform inspects anything an employee sends to an AI tool before it gets there, with custom small language models reading each interaction in context and delivering verdicts within milliseconds2

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. This approach allows the system to distinguish between risky actions, such as pasting live credentials into a chat window, and legitimate work, like a developer referencing a database schema2

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. Over the past 12 months, Harmonic extended beyond browser-based AI monitoring to cover desktop AI applications and agentic workflows in a single platform, closing gaps where personal-account use and sensitive data exposure typically emerge1

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Addressing Board-Level Questions on AI Security and Value Creation

CEO and Co-Founder Alastair Paterson explained that every board wants answers to two questions: how to reduce AI security risks and whether organizations are getting value from AI investments1

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. Harmonic addresses both through its Usage Intelligence layer, which runs on the same small language models that power security controls1

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. Leaders can see which AI use cases create value, identify employees who have found faster ways to work, and determine where to invest next rather than where to restrict access1

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. This dual focus helps organizations govern how employees use AI tools while maintaining productivity and innovation.

Expanding Integration Ecosystem With Cisco Cloud Control and Anthropic Claude

Harmonic Security has been integrating with tools enterprises already use to extend its platform's reach. The company is named among the ecosystem integrations for Cisco Cloud Control's new Agent Builder, announced at Cisco Live, connecting through Model Context Protocol1

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. A separate integration with the Anthropic Claude Compliance API gives security teams visibility into Claude Platform activity logs and conversation content for organizations on Claude Enterprise across Anthropic-hosted deployments1

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. These partnerships position Harmonic to capture AI governance needs as enterprises scale their AI use cases across multiple platforms.

Investor Confidence in Balancing Speed and Control for AI Adoption

Zach Sivertson, Managing Director at Crosspoint Capital Partners, stated that AI security has too often slowed the adoption of new technology1

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. Organizations embracing AI should not have to choose between moving quickly and maintaining control, he noted, adding that Harmonic gives leaders the visibility and confidence to accelerate adoption while empowering employees to use productive tools with appropriate guardrails1

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. Before this Series B funding, Harmonic raised a $17.5 million Series A led by Next47 in October 20242

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. Paterson acknowledged the company has real momentum and that the new capital allows faster development as the AI landscape continues shifting rapidly1

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