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Island, an enterprise cybersecurity startup, has raised $400 million in a Series F funding round, bringing its valuation to $6.4 billion. The round was led by Evolution Equity Partners, with participation from a broad group of investors including Sequoia Capital, Coatue Management, and J.P. Morgan Growth Equity Partners. The company, which provides an enterprise browser and security platform, intends to use the capital to accelerate product development and international expansion as it targets the security challenges posed by the integration of AI agents into corporate environments.
Island announced a $400 million Series F funding round on September 24, 2026, reaching a $6.4 billion valuation. The round was led by Evolution Equity Partners.
New and existing investors participated, including Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared, and Squarepoint. Cybersecurity entrepreneur Dmitri Alperovitch also contributed a personal investment.
The company, founded in 2022, currently employs approximately 1,000 people and reports that its annual recurring revenue has doubled each fiscal year since its inception.
The funding is earmarked for product development and international expansion, specifically focusing on tools that secure and monitor AI agents as they interact with corporate applications and data.
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The significant valuation increase—more than double the company's 2024 figure—highlights a growing investor focus on security infrastructure specifically designed for the 'agentic era.' As enterprises increasingly deploy AI agents that interact with sensitive data and internal applications, traditional network-based security models are becoming less effective. Island’s platform aims to provide a centralized control plane that monitors and governs both human and activity, addressing the friction between security requirements and the rapid adoption of automated workflows. This funding round underscores the market's belief that specialized security layers are essential for the safe, scalable deployment of AI in the enterprise.
The rise of AI agents is forcing a shift in enterprise security architecture. Because these agents operate across various layers of the technology stack, they often bypass traditional network-based security assumptions.
Island’s platform is positioned as a 'control plane' that provides visibility and governance over both human users and AI agents, aiming to secure data without introducing operational friction.
The valuation jump reflects strong investor appetite for cybersecurity solutions that address the specific risks introduced by AI, rather than generic security software.
By focusing on the 'agentic era,' Island is attempting to define a new category of security infrastructure that bridges the gap between legacy network security and the needs of modern, automated workflows.
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Observers should monitor how Island integrates its 'last-mile' control, network, data, and observability features to manage AI agents specifically. While the company claims its platform can govern agents across the technology stack, the practical effectiveness of these controls in complex, multi-vendor enterprise environments remains to be seen. Additionally, as the company scales, its ability to maintain its reported growth in annual recurring revenue while competing against established security incumbents will be a key indicator of its long-term viability in the crowded cybersecurity market.
The company's ability to successfully implement its 'control plane' across diverse enterprise environments will be critical to its continued growth.
Market analysts will be watching to see if Island can maintain its rapid revenue growth as it scales internationally and faces competition from established cybersecurity firms.
The effectiveness of Island's governance tools in preventing unauthorized data access by AI agents remains a key area for potential customers to evaluate.