Harmonic Security Raises $50M Series B for Workforce AI Controls
Harmonic Security raised a $50 million Series B led by Crosspoint Capital Partners, bringing total funding to $76 million.
Harmonic Security has raised a $50 million Series B led by Crosspoint Capital Partners, with existing investors including Ten Eleven Ventures and StepStone Group participating. The round brings total disclosed funding to $76 million.
The company plans to expand engineering and go-to-market teams in the United States and United Kingdom. Harmonic was founded in 2023 by Alastair Paterson and Bryan Woolgar-O'Neil, who previously built threat-intelligence company Digital Shadows.
The round
| Item | Detail |
|---|---|
| Financing | $50 million Series B |
| Lead | Crosspoint Capital Partners |
| Other investors | Ten Eleven Ventures, StepStone Group and existing backers |
| Total disclosed funding | $76 million |
| Valuation | Undisclosed |
Why workforce AI creates a new security layer
Employees increasingly use public chatbots, embedded copilots and browser-based AI tools with company data. AI agents add another layer because they can invoke tools, access systems and take actions rather than only generate text.
Traditional data-loss-prevention products inspect files and network traffic, but generative-AI use requires context: the same paragraph may be safe in an internal model and risky in an external consumer service. Harmonic's platform attempts to classify both the data and the user's intent before content reaches the AI application.
The company also provides controls for agentic workflows and the Model Context Protocol. That moves the product from blocking copy-and-paste behavior toward governing tool calls, data access and autonomous actions.
Competitive landscape
Harmonic competes with Prompt Security, Cyberhaven and browser-security vendors, while large platforms such as Netskope, Palo Alto Networks and Microsoft are adding AI controls to broader security suites.
A focused vendor can move faster and provide more granular AI-specific policy. The disadvantage is distribution: enterprise buyers may prefer to extend an existing DLP or secure-access contract rather than add another control plane.
Crosspoint's involvement is strategically notable because the firm specializes in cybersecurity and infrastructure software. The investment thesis appears to be that AI usage control becomes its own durable category rather than a feature absorbed by incumbent vendors.
What the funding must prove
Harmonic says the new capital will help make safe AI adoption available to millions more employees. The harder commercial questions are customer retention, deployment friction and how often contextual controls stop real leakage without blocking legitimate work.
The winner in this market must protect sensitive information across fast-changing AI interfaces while keeping false positives low. The Series B gives Harmonic room to scale, but it also raises the benchmark from technical differentiation to repeatable enterprise distribution.
Follow Venture Capital Tracker in Google
Add VCT as a preferred source to make our venture-capital coverage easier to find in Google Search.
Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.
