Harmonic Security
Harmonic Security sells AI governance software that monitors AI usage and data context in real time. The 78-person company raised $25M in Series A funding in October 2024.
The growth story
Harmonic Security grew from 1 to 78 employees between 2023 and 2026, raising $25M along the way, most recently a Series A in October 2024.
About
Harmonic Security's platform gives security teams visibility into AI tools and workflows across an organization. It aims to help companies adopt AI faster while reducing risks by understanding user and agent intent in real time.
The company raised $25M in Series A funding in October 2024, less than two years after its 2023 founding. Its 78-person team includes engineers with backgrounds at cybersecurity firms like Digital Shadows and ReliaQuest.
Founders and leadership
Engineering is Harmonic Security's largest function with 11 people. The company has a median tenure of 1 year, suggesting rapid hiring since its 2023 founding.
The Harmonic Security org chart
Alastair Paterson (Chief Executive Officer) leads 45 mapped leaders with 7 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Engineering 21 (+24% YoY), Sales 14 (+250% YoY), Information Technology 7 (+250% YoY), Business Development 7 (0% YoY), Marketing 6 (+200% YoY), Customer Success and Support 4 (+300% YoY).
Talent flow
Harmonic Security hires heavily from cybersecurity firms, with Digital Shadows and ReliaQuest being the top sources. Alumni have moved to companies like Zenity and Alation.
Most common previous employers of Harmonic Security staff: Digital Shadows (10), ReliaQuest (9), BAE Systems Digital Intelligence (6), Darktrace (4), Expel (3), Material Security (3). Former Harmonic Security employees most often moved to Zenity (1), Alation (1), Adaptive Security (1), NEG (1), Fulton Bank (1), Harvard University (1).
Hiring now
Web traffic
Traffic mix: 23% direct, 55% search, 5% social, 0% paid.
What this company is made of
Most common skills at Harmonic Security: Management (24), Leadership (22), Microsoft Office (20), Project Management (19), Microsoft Excel (19), Software as a Service (SaaS) (18), Sales (17), Strategy (17).
Where the team actually sits
Harmonic Security people are concentrated in England, United Kingdom (17), California, United States (10), United Kingdom (7), Florida, United States (3).
Search footprint
Harmonic Security attracts about 18 organic search visits a month, traffic worth roughly $0K a month if bought through ads. It gained 4 ranking keywords and lost 32 in the last period.
What employees say
- Compensation
- 4.80 / 5
- Career opportunities
- 5.00 / 5
- Senior management
- 4.80 / 5
- Work-life balance
- 4.80 / 5
Frequently asked
Harmonic Security has 78 employees as of September 2026.
Harmonic Security has raised $25M in total, most recently a Series A round in October 2024.
Alastair Paterson (Chief Executive Officer) sits at the top of Harmonic Security's reporting structure, with 7 direct reports.
The most common previous employers of current Harmonic Security staff are Digital Shadows (10 people), ReliaQuest (9 people), BAE Systems Digital Intelligence (6 people).
Former Harmonic Security employees most often move to Zenity (1), Alation (1), Adaptive Security (1).
Harmonic Security attracts about 18 organic search visits a month, worth roughly $0K a month in equivalent ad spend.
The most common skills among Harmonic Security staff are Management, Leadership, Microsoft Office, Project Management, Microsoft Excel.
Harmonic Security staff are concentrated in England, United Kingdom (17), California, United States (10), United Kingdom (7).
Harmonic Security has about 21 people in Engineering, up 24% over the past year, as of September 2026.
Harmonic Security has about 14 people in Sales, up 250% over the past year, as of September 2026.
Computed from 62 current and 11 former Harmonic Security profiles, as of September 2026. Source: Crustdata.
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