Island raises $400 million Series F as it pitches the enterprise browser as a control point for AI agents

Island raises $400 million Series F as it pitches the enterprise browser as a control point for AI agents

24 September 2026: Island, a Dallas, Texas company best known for its enterprise browser, announced on 24 September 2026 that it has raised $400 million in a Series F round, bringing its valuation to $6.4 billion, according to the company.

The round

• Amount and stage: $400 million, Series F, from Island's own press release.
• Lead investor: Evolution Equity Partners.
• Other investors named: Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared and Squarepoint, plus a personal investment from Dmitri Alperovitch.
• Use of the money: to "fuel the company's next phase of growth and innovation as enterprises scale AI agents".

What the company does

Island started with a Chromium-based browser built for companies, in which IT can set data rules (for example, blocking copy and paste or downloads from certain applications), record sensitive sessions and give contractors safe access without a managed laptop. It now describes the product as an "agentic control plane": the browser plus endpoint, network and data controls that apply to both people and the AI agents acting for them.

Why it matters for buyers

The browser has become where most business software is used, and increasingly where AI agents act. Putting policy at the browser lets a company control what an agent can see and do inside web applications without changing each application. The trade-off is dependence on one vendor's browser across the workforce.

What to check

• IT and security teams should test compatibility with their critical web applications, single sign-on and device management, and ask how updates follow the upstream Chromium release cycle.
• Teams using AI agents should ask how agent actions are identified separately from human ones, logged and limited.
• Procurement should compare the licence cost against the virtual desktop, secure web gateway or remote access tools it might replace, and plan the exit path if the company later changes direction.

Sources

• Island: Island announces $400 million Series F, bringing valuation to $6.4 billion - 24 September 2026
• GCN - read 5 October 2026