Key Takeaways
- • Harmonic Security raised $50 million in an oversubscribed Series B round led by Crosspoint Capital Partners, bringing its total capital raised to $76 million.
- • The San Francisco and London-based company builds security software that lets enterprises detect employee AI tool usage, flag data risks and enforce controls in real time.
- • Harmonic says its technology is used by millions of employees across more than 100 organisations, and its headcount has grown from about 30 in October 2024 to over 90.
- • The company competes with cybersecurity incumbents that have moved into AI security, including SentinelOne's purchase of Prompt Security and Cato Networks' acquisition of Aim Security.
- • Gartner projects worldwide security software spending to rise from $15.6 billion in 2025 to $37.6 billion in 2030.
Summary
Harmonic Security has raised $50 million in Series B financing, with Crosspoint Capital Partners leading the round and existing investors participating, according to the company's announcement as reported by Ventureburn. The oversubscribed round brings Harmonic's total funding to $76 million. The company's previous Series A, $17.5 million, was led by Next47 in October 2024. The funds will be used to accelerate engineering, sales and marketing across the United States and United Kingdom.
Harmonic, which is headquartered in San Francisco with a London presence, builds security software for enterprise AI adoption. Its platform records AI interactions, categorizes tasks by context and uses custom small language models to analyze interactions in milliseconds. The system is designed to separate legitimate technical work from activity that could pose a risk to sensitive information or enterprise credentials. The company also offers Usage Intelligence tools that help managers understand how their organisations use AI and where efficiency gains may exist.
Crosspoint Capital managing director Zach Sivertson said there is "no reason companies should have to choose between technology innovation and security," describing Harmonic as offering the "best of both worlds." Alastair Paterson, Harmonic's co-founder, said enterprise leaders generally ask two questions: whether AI will compromise the organisation and whether it is delivering a return on investment. Harmonic claims its technology is used by millions of employees in more than 100 organisations, including a number of large global enterprises. The company has added distribution partners Climb and Distology.
The company faces competition from established cybersecurity vendors that have been expanding their AI offerings. SentinelOne acquired Prompt Security, and Cato Networks announced an acquisition of Aim Security. Demand for tools that secure generative and agentic AI is growing. Gartner forecasts worldwide security software expenditure will reach $37.6 billion by 2030, up from $15.6 billion in 2025, as enterprise security needs expand.
Harmonic, which is headquartered in San Francisco with a London presence, builds security software for enterprise AI adoption. Its platform records AI interactions, categorizes tasks by context and uses custom small language models to analyze interactions in milliseconds. The system is designed to separate legitimate technical work from activity that could pose a risk to sensitive information or enterprise credentials. The company also offers Usage Intelligence tools that help managers understand how their organisations use AI and where efficiency gains may exist.
Crosspoint Capital managing director Zach Sivertson said there is "no reason companies should have to choose between technology innovation and security," describing Harmonic as offering the "best of both worlds." Alastair Paterson, Harmonic's co-founder, said enterprise leaders generally ask two questions: whether AI will compromise the organisation and whether it is delivering a return on investment. Harmonic claims its technology is used by millions of employees in more than 100 organisations, including a number of large global enterprises. The company has added distribution partners Climb and Distology.
The company faces competition from established cybersecurity vendors that have been expanding their AI offerings. SentinelOne acquired Prompt Security, and Cato Networks announced an acquisition of Aim Security. Demand for tools that secure generative and agentic AI is growing. Gartner forecasts worldwide security software expenditure will reach $37.6 billion by 2030, up from $15.6 billion in 2025, as enterprise security needs expand.
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