Island says it has raised US$400 million in a Series F financing round led by Evolution Equity Partners, valuing the company at US$6.4 billion. The company said the valuation is more than double its 2024 level.
The funding is set to support Island’s growth as enterprises deploy AI agents and change how work is carried out across browsers and other endpoints. Island positions its product as an “agentic control plane”, aimed at giving organisations visibility, control and auditability across browsers, endpoints, networks and data.
“Enterprises are rethinking the basic architecture of work. Island meets the moment with a unique advantage: it can see and govern what people and agents are doing as they interact with applications and data, wherever that happens,” said Richard Seewald, founder and managing partner at Evolution Equity Partners.
Existing 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 participated in the round, Island said. The company also said the round included another personal investment from cybersecurity entrepreneur Dmitri Alperovitch.
Island CEO and co-founder Mike Fey said the company has expanded from its initial “Enterprise Browser” focus into data protection and data loss prevention, and has built a secure access service edge (SASE) architecture “from the endpoint outward”.
“We’ve entered a new era in which people and AI agents work side by side. Just like humans, agents need the right context, access, guardrails, and accountability to succeed,” Fey said.
Island said it employs 1,000 people and has doubled annual recurring revenue every fiscal year since its 2022 launch, attributing demand to organisations looking to accelerate AI adoption, redesign networks for end users, simplify security infrastructure and protect sensitive data.
Cyberstarts founder and general partner Gili Raanan said the firm has backed Island since its early stages and described the company’s progress as aligned to governance needs for AI agents.
The company also referenced recognition including inclusion on the CNBC Disruptor 50 list for 2026, a Frost & Sullivan award, and a Gartner Peer Insights Customers’ Choice designation for secure enterprise browsers.
Island CTO and co-founder Dan Amiga said AI agents require governance across multiple layers of the technology stack, describing Island’s platform as unifying “last-mile control, network, data, identity, and observability”.
“Agents do not operate in a single layer of the technology stack, so they cannot be governed from one,” Amiga said.
Alperovitch, identified as co-founder and chairman of Silverado Policy Accelerator and co-founder and former CTO of CrowdStrike, said AI agents will challenge network-based security assumptions and argued security controls need to move closer to where work is performed.
