Island, the enterprise browser company, has secured $400 million in Series F funding at a $6.4 billion valuation, marking a major milestone in the development of the “agentic control plane.” The round, led by Evolution Equity Partners with participation from Sequoia, Coatue, Cyberstarts, Insight, J.P. Morgan, Prysm, Alta Park, Georgian, G Squared, and Squarepoint, brings the company’s total funding to over $900 million. Dmitri Alperovitch, co-founder of CrowdStrike, also joined as an investor.
The valuation represents a 33% step-up from the company’s $4.8 billion Series E round in March 2025. Island’s annual recurring revenue (ARR) has reportedly doubled every fiscal year since its launch in 2022, though exact figures were not disclosed. The capital will be used to accelerate the development of the Island Enterprise Browser as the primary control plane for governing both human and AI agent activities within the enterprise.
The Browser as Agent Security Layer
The architecture of the Island Enterprise Browser is fundamentally different from API-level monitoring or traditional sandboxing. By controlling the browser environment itself, Island provides a native governance layer where all agent activity—whether it’s an AI assistant browsing the web or a specialized agent accessing internal SaaS applications—must pass through a single, controlled point. This “last mile” security model allows for granular control over data exfiltration, credential surrogation, and process classification.
Mike Fey, co-founder and CEO of Island, stated: “The enterprise browser has become the most critical infrastructure for the modern workforce. As AI agents move from experimental prototypes into production workflows, the browser is the only place where you can govern the intersection of humans, agents, and data at scale.”
A Different Kind of Governance
This approach validates the growing demand for a different kind of agent security. While other vendors focus on API-level monitoring (like Dataiku and SAP) or specialized routing (like NiCE Cognigy), Island is betting that the browser is the natural habitat for agent execution. If the browser becomes the agentic control plane, it provides a horizontal governance layer that works across all cloud providers and applications.
The market’s bet on Island follows a wave of agent governance products shipped this month. As the Agent Governance Stack continues to form, the industry is converging on a few key architectural solutions: kernel-level enforcement (Meta Sentinel), persistent cloud VMs (GrokBot), and now browser-native control. Island’s $6.4 billion valuation suggests that the browser-based approach is a leading contender for the enterprise security standard.
Market Recognition and Growth
Island’s growth is reflected in its recent accolades, including being named a 2026 Frost & Sullivan Company of the Year and receiving the Gartner Peer Insights Customers’ Choice for Security Service Edge. The company was also recognized on the CNBC Disruptor 50 list. With the Series F funding, Island is well-positioned to lead the next phase of enterprise AI adoption, focusing on the security and governance requirements that have—until now—been the primary obstacle to production-grade agent deployment.
For builders and security professionals, the signal is clear: the agent economy is no longer just about the models. It is about the control plane. Whether that plane lives in the kernel, the VM, or the browser will determine how enterprises manage the risks and rewards of autonomous agents in the coming years.