The Pulse
Island Raises $400M to Extend Security to AI Agents
Island raised $400 million in a Series F round at a $6.4 billion valuation, led by Evolution Equity Partners. The Dallas company says it will use its enterprise security platform to govern work by employees and AI agents across browsers, ne
AI.info Team ·
“We’ve entered a new era in which people and AI agents work side by side.”
Mike Fey, CEO and co-founder of Island
Island announced a $400 million Series F on September 24, valuing the enterprise security company at $6.4 billion. Evolution Equity Partners led the round, which Island says will fund its next phase of growth and product development as companies expand their use of AI agents.
The Dallas-based company is pitching its platform as a way for businesses to monitor and govern activity by both employees and AI agents. Island began with its Enterprise Browser and has since expanded into data protection and network security. Its latest framing puts those capabilities under one “agentic control plane” for work across browsers, endpoints, applications, networks and data.
Island ties the browser to five layers of control
Island CTO and co-founder Dan Amiga describes the platform as covering five layers: last-mile control, network, data, identity and observability. The company says they provide a common view of who or what is acting, what resources it can reach, what data it can use and whether an action should be allowed.
Island’s Enterprise AI offering includes identity governance, access controls, guardrails, data boundaries, human approvals and cost governance. The company says its audit trail spans browsers, endpoints, cloud services and internal resources. The release presents those features as controls for work that may cross multiple systems, rather than as a separate security product for each AI model or agent.
A $6.4 billion valuation follows the $4.8 billion round
Island says it employs 1,000 people and has doubled annual recurring revenue every fiscal year since launching in 2022. It does not disclose an ARR figure in the financing announcement. The statement lists existing investors including Sequoia Capital, Coatue Management, Insight Partners and Cyberstarts, alongside new investors; cybersecurity entrepreneur Dmitri Alperovitch also made another personal investment.
The new valuation follows Island’s March 2025 Series E, a $250 million round that valued the company at $4.8 billion. That increase gives the latest financing a concrete marker of Island’s fundraising momentum, but neither announcement provides a revenue total that would let readers compare the valuation with sales.
The agent-security pitch still needs deployment evidence
Island’s announcement sets out a broad claim: that a single platform can apply security and governance controls across human and agent activity. It does not name customers using the platform to govern AI agents, report how many agents it monitors or provide results from deployments. The release also gives no breakdown of how the $400 million will be allocated.
Those omissions leave the financing announcement stronger on product scope and investor backing than on evidence of agent-security adoption. Island says it has doubled ARR annually since launch, but publishes no ARR figure and no count of AI agents under management.