Island Raises $400M at $6.4B Valuation for Agentic Control Plane

In a significant development for the enterprise security sector, Island has successfully closed a $400 million Series F funding round, propelling its valuation to an impressive $6.4 billion. This substantial capital infusion underscores the company's rapid ascent and its pivotal role in defining the emerging "agentic control plane" category. The funding was led by Evolution Equity Partners, with robust participation from a syndicate of prominent investors including Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared, and Squarepoint. Notably, cybersecurity luminary and CrowdStrike co-founder Dmitri Alperovitch also contributed personally.

Founded in 2020, Island has distinguished itself by embedding security, access management, and productivity functionalities directly into the user's existing browser. This innovative approach has evolved into a comprehensive platform that governs both human and AI agents, offering a unified policy engine and audit trail across five critical layers: last-mile control, network, data, identity, and observability. This integrated framework provides real-time visibility into user and agent actions, their reach, and adherence to security protocols. The company reports that eight of the world's top ten financial institutions now utilize its Enterprise Browser, highlighting its critical adoption within highly regulated industries.

The company's growth trajectory is remarkable, with its headcount nearly doubling to 1,000 employees from over 500 in the past year. Island's revenue is reported to have approached $200 million by September 2026, demonstrating a near 100% annual growth rate. This financial performance and market traction have more than doubled its valuation from its 2024 Series D round, where it achieved a $3 billion valuation after raising $175 million. Its previous Series E round in March of the same year secured $250 million at a $4.8 billion valuation.

Island's leadership team brings a wealth of experience. CEO Mike Fey, a former EVP of enterprise products at McAfee and CTO of Intel Security, previously led Blue Coat Systems through its $4.7 billion sale to Symantec. CTO Dan Amiga, who co-founded Island, is the inventor of web isolation technology from his previous venture, Fireglass, which Symantec acquired for $250 million. Amiga's background also includes significant roles at Microsoft and Israel's Unit 8200 cyber intelligence corps.

This funding round occurs amidst a dynamic market where the enterprise browser space has seen significant consolidation. Competitors like Talon Cyber Security were acquired by Palo Alto Networks for $458.6 million, while LayerX Security was bought by Akamai for approximately $205 million, and Seraphic Security was absorbed by CrowdStrike. Island's substantial funding and continued independent growth position it as a dominant force, differentiating itself from rivals that have been integrated into larger security platforms.

Island's strategic vision, as articulated by CEO Mike Fey, centers on providing a unified governance framework for both human and AI agents operating in modern enterprises. This approach addresses the increasing need for consistent security policies, access controls, and accountability across all digital interactions. Richard Seewald, founder of Evolution Equity Partners, emphasized Island's ability to create and lead a new market category, displacing older technologies and accelerating digital transformation. The company's consistent year-over-year revenue growth and substantial valuation validate its position as a critical solution for enterprise security and operational efficiency.