Island Raises $400M at $6.4B Valuation for Its Enterprise Browser

Knowledge workers use Island's browser to reach their employers' cloud-based business applications. The software blocks malware-laden web pages, phishing emails and other threats, and it is designed to mitigate cybersecurity problems that originate on the user's side. Island can be configured to reject login requests coming from insecure workstations and Wi-Fi networks.

The software-as-a-service applications a company relies on do not always meet its cybersecurity requirements. A service may, for example, lack an authentication mechanism that a bank typically builds into its own custom software. Island says its browser closes such gaps by overlaying customer-created security features on a cloud application's interface.

The ability to extend third-party services carries other benefits. According to the company, enterprises can build automation workflows that speed up repetitive tasks for their workers. Island also collects telemetry on how users interact with applications, and that data makes it possible to detect unauthorized activity such as attempts to copy information into an untrusted service. The same data can surface opportunities to improve the user experience of an organization's applications.

Island's browser is based on Chromium, the open-source project that underpins Chrome. Employees who prefer Google's browser or another consumer-oriented alternative can reach Island's features through an extension. The company additionally offers an endpoint client called Island Desktop, which is used to secure the programs workers run on their devices.

Last month Island expanded its feature set with capabilities aimed at securing artificial intelligence workloads. The platform can now build an inventory of the AI agents an organization's employees use, and it maps the MCP servers, files and browser extensions those agents draw on. Island blocks AI tools that pose a cybersecurity risk, and it protects authorized workloads by filtering malicious prompts and stripping overly broad access permissions.

According to the company, the platform doubles as a cost optimization tool. The software logs the inference expenses associated with employee agents, then analyzes the data to identify unused AI tools and tasks that can be moved off expensive frontier models onto lower-cost alternatives.

"Enterprises are rethinking the basic architecture of work," said Richard Seewald, founder and managing partner of Evolution Equity Partners. "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."

Island said it will use the new funding to accelerate product development and go-to-market initiatives. SiliconANGLE reported that the company plans to hire 500 employees by mid-2027 to support that effort.