Cybersecurity company Island has raised $400 million in a Series F financing round that values the company at $6.4 billion, extending one of the larger recent funding runs associated with Israel's cybersecurity sector.
The round was announced on September 24 and was led by Evolution Equity Partners, with participation from existing and new investors. Island said the money will be used to expand its technology as large companies deploy more artificial intelligence agents alongside human employees.
The financing is notable not only for its size, but for the shift in Island's pitch. The company became known for building a browser designed specifically for enterprise use. It is now positioning itself more broadly as a control layer for both people and AI agents working across corporate systems.
From enterprise browser to “agentic control plane”
Island's original product centered on a simple idea: instead of securing a consumer browser with many separate enterprise tools, build security, identity, data controls and administrative visibility directly into the browser employees use for work.
That approach helped create the “enterprise browser” category. But the company's newest messaging reflects a different problem now facing large organizations: AI agents can act across applications and data without behaving like traditional human users.
Island says its platform is being expanded to govern identity, access, data boundaries, approvals, costs and audit trails for those agents. In practice, that means giving security teams a way to see what an automated agent is allowed to access, what it is doing and whether a particular action should be permitted.
The company describes this broader architecture as an “agentic control plane.” That is Island's own product framing, not an independent industry standard, but it illustrates how cybersecurity companies are adapting their products to the rapid spread of AI driven automation inside businesses.
The Israel connection
Island is headquartered in Dallas and has research and development operations in Tel Aviv. It was co-founded by Mike Fey, a former senior executive at Symantec and McAfee, and Dan Amiga, an Israeli cybersecurity entrepreneur who previously founded Fireglass.
Amiga is also a veteran of Israel's Unit 8200 and previously worked at the Microsoft Technology Center in Tel Aviv. Island's official materials list offices in Dallas, London and Tel Aviv.
That structure makes Island part of a familiar pattern in Israeli technology: U.S. facing headquarters and sales operations paired with a substantial research and development base in Israel.
Valuation has climbed rapidly
Island's valuation has increased sharply over the past several years.
In April 2024, the company raised $175 million at a $3 billion valuation. In March 2025, it announced another $250 million round at a $4.8 billion valuation. The new $6.4 billion figure represents another step up as investors continue to place large bets on enterprise cybersecurity and AI infrastructure.
Island said in 2025 that it had raised about $730 million in outside investment at that point. Adding the newly announced $400 million round implies cumulative external funding of roughly $1.13 billion based on the company's published round totals.
Why AI agents are changing the security problem
Traditional cybersecurity systems were largely designed around human users, known devices and applications that follow relatively predictable access patterns.
AI agents complicate that model because they can perform multi-step tasks, connect to different systems and make decisions with limited direct human involvement. A badly configured agent may have access to more data than it needs, while a compromised or poorly governed agent could potentially move information or trigger actions at machine speed.
That is why companies across cybersecurity are increasingly focusing on identity, permissions, monitoring and data controls for AI systems rather than treating AI only as a new productivity tool.
Island's financing suggests investors believe that governance layer could become a major enterprise security market. The size of the round does not by itself prove that Island will dominate the category, but it gives the company significant capital to compete as established security vendors and newer startups target the same problem.
What to watch next
The next test for Island is whether its broader platform can grow beyond the browser category that made the company distinctive in the first place.
Its pitch now spans browsers, endpoints, networks, identity, data and observability. That creates a larger potential market, but also puts Island into more direct competition with major security and enterprise software companies.
For Israel's technology sector, the round is another example of large global funding continuing to flow into cyber companies with substantial Israeli engineering roots, even as the center of gravity for customers and capital remains heavily international.
