Island raises $400 million at a $6.4 billion valuation – more than 30% above last year's round
Security company Island announced on Thursday 24 September 2026 a $400 million Series F round, valuing the Dallas-based company at $6.4 billion. But the round is about more than capital: Island is repositioning itself from selling an enterprise browser to offering a control layer – an "agentic control plane" – for governing AI agents across enterprise systems.
The round in numbers
According to Reuters, which covered the news the same day it broke, the company itself says it has raised $400 million in a Series F at a $6.4 billion valuation. That is more than 30% higher than the $4.8 billion valuation from last year's funding round – a significant, though not explosive, upward adjustment in roughly a year (Reuters via MSN).
The round was led by Evolution Equity Partners and includes both existing and new investors, according to CTech (Calcalist). Neither the full investor list nor the terms of the investment beyond the amount are confirmed in the available coverage.
By the company's own figures, Island stands relatively strong: according to information the company provided to Reuters, Island has around 1,000 employees, has doubled its annual recurring revenue (ARR) every year since 2022, and counts PayPal, Amazon and Pfizer among its customers. These figures are the company's own and are not independently verified.
From browser to control plane
The strategic move is what distinguishes this round from routine fundraising. Island has until now been known for its enterprise browser – a browser built for the corporate market, with built-in security controls over what employees can do online. Now the company's focus is expanding: the money will, according to the company, support the next phase of growth, shaped by companies increasingly deploying AI agents that can interact with applications, data and business systems with growing autonomy.
The company sells the idea as an "agentic control plane" – a control layer combining endpoint, network, data, identity and observability controls to govern what AI agents are actually allowed to do. The CTech article describing the concept is truncated, so the full product presentation is not available in the sources at hand.
The security rationale comes from the company itself. Island co-founder and CTO Dan Amiga justified the strategy to CTech as follows, translated: "Agents do not operate in a single layer of the technology stack, so they cannot be governed from one" (CTech). The point is that an agent moving between browsers, APIs, databases and identity systems cannot be caught by a single security tool, but requires coordinated controls across layers.
Why it may matter
Island's direction points to a real question companies already face: AI agents are not just chatbots, but software that can click, buy, send and retrieve on their own initiative. If agents are to work inside business-critical systems, someone has to define what they can access, what they can execute, and how their activity is logged – tasks currently spread across classic security products.
The investors apparently see the same thing. Reuters framed the round as a signal of growing interest in the sector, driven by rapid AI adoption creating new security risks. It is worth distinguishing two things, however: it is documented that Island has raised money, and it is documented what the company says about why. Whether AI agents actually create the security problems Island claims is the company's framing, not something the available sources independently document. No concrete agent incidents are tied to the round in the coverage.
Who is Island?
Island is a Dallas-based cybersecurity company led by CEO Mike Fey, according to the Dallas Morning News, which covered the round the same day (Dallas Morning News via MSN).
With around 1,000 employees and a $6.4 billion valuation, by the company's own figures, Island places itself among the largest private security companies – a class where revenue growth and customer base tend to weigh more heavily than technology details in the valuation.
Open questions
Several things remain unresolved after today's announcement:
- Verification. All key figures – the amount, valuations, ARR growth, headcount, customer list – come from the company's own information as relayed by Reuters, CTech and the Dallas Morning News. There is no independent confirmation of the figures in the available source material.
- Conflicting history. Reuters and the Dallas Morning News write that the new valuation is more than 30% above the $4.8 billion from a round in 2025. CTech presents it differently, saying the valuation has more than doubled since 2024. The baseline year and magnitude conflict, and cannot be reconciled from what is available.
- Product scope. Since the CTech article is truncated, it is unclear exactly how the "agentic control plane" will work in practice, what constitutes new products versus extensions of the existing browser, and when it will become generally available.
- Documented need. There are no publicly documented security incidents involving AI agents tied to this round. The threat picture is the company's argument, and time will tell whether enterprises actually buy agent control planes as a distinct product category – or solve the problem with existing tools.
What Island has achieved is concrete regardless: $400 million in new funding, a $6.4 billion valuation, and a clear explanation of what the money will be used for. Whether the market is ready for an "agentic control plane" is the next chapter of the story.