Harmonic Security Secures $50M in Series B Funding

Harmonic Security, a San Francisco, CA-based workforce AI security platform provider, has raised $50 million in a Series B funding round, bringing the total amount to $76 million.

The round was led by Crosspoint Capital Partners with participation from existing investors.

The company will use the funding to accelerate growth and expand its engineering and go-to-market teams across the United States and the United Kingdom.

What is Harmonic Security?

Harmonic Security develops a platform that helps businesses manage the security risks associated with employee use of AI tools.

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The platform identifies how employees use AI, detects potential exposure of sensitive information, and applies security controls in real time. It covers browser-based AI tools, desktop applications, and AI agent workflows.

Harmonic uses small language models to understand the context of AI interactions. This helps distinguish routine work from potentially risky activities, such as sharing sensitive credentials allowing businesses to manage AI use without unnecessarily restricting employees.

Its Usage Intelligence feature also helps organisations understand which AI use cases are delivering value and where employees are improving their workflows.

How Much Funding Has Harmonic Security Raised?

Harmonic Security has raised $50 million in its latest Series B funding round.

The investment brings the company's total funding to $76 million. The source does not provide details of previous funding rounds.

Who Invested in Harmonic Security’s Series B?

The $50 million Series B round was led by Crosspoint Capital Partners, with participation from existing investors.

Why the Funding Matters

Harmonic Security will use the new funding to accelerate business growth and expand its engineering and go-to-market teams in the United States and the United Kingdom.

The investment will support the company's efforts to help more businesses monitor AI usage, protect sensitive data, and manage security risks across AI tools and workflows.

Who founded Harmonic Security?

Harmonic Security was founded in 2023 by Alastair Paterson and Bryan Woolgar-O'Neil.

The company is headquartered in San Francisco, California.

"Every board I talk to is asking two questions: how do we reduce the risk of AI use, and are we getting value? Most vendors struggle to answer the first, yet we address both," said Alastair Paterson, CEO and Co-Founder of Harmonic Security.

"We've got some real momentum, and I know we’re just getting started. This round means we get to build that out faster and continue rapidly responding to the AI landscape shifts," Paterson said.

Market and Business Growth

Harmonic Security protects and enables AI use for employees at more than 100 companies, including large enterprises.

The company has grown to more than 90 employees across the United States and the United Kingdom. It has also signed distribution partnerships with Climb and Distology.

Recent product developments include support for desktop AI tools and agentic workflows. Harmonic has also integrated with Cisco Cloud Control's Agent Builder through the Model Context Protocol and developed an integration with Claude's Compliance API to provide security teams with visibility into Claude Platform activity.

What Happens Next?

Harmonic Security plans to expand its engineering and go-to-market teams across the United States and the United Kingdom.

The company will continue developing its AI security platform and building integrations to help businesses understand and manage AI use across their workforce.

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