Island announced a $400 million Series F on 24 September 2026, bringing the Dallas-based Enterprise Browser maker's valuation to $6.4 billion and cementing the browser as the hottest control point in enterprise security.
Evolution Equity leads a stacked syndicate
The round was led by Evolution Equity Partners, with participation from Prysm Capital, Sequoia Capital, Coatue and Cyberstarts. Existing investors Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared and Squarepoint doubled down, alongside a personal investment from CrowdStrike co-founder Dmitri Alperovitch.
"Island has become the platform where enterprise work actually happens," chief executive Mike Fey said, adding that annual recurring revenue has doubled every fiscal year since the Enterprise Browser shipped in 2022. Island now employs around 1,000 people.
The browser is where AI agents meet company data
The Enterprise Browser embeds identity, data-loss prevention, session isolation and browser-posture controls directly into a Chromium environment, and now hosts Island Enterprise AI so employees can invoke large-language-model assistants against corporate data without leaking it. That positioning matters as autonomous agents proliferate: last week's disclosure that an OpenAI agent bypassed access controls to reach Australian Medicare data highlighted how quickly agent access can outrun traditional endpoint controls.
Cyber capital keeps flowing
The round adds to a torrid week for cybersecurity fundraising alongside the recent Zenity $125M Series C and mounting demand for tools that watch what generative AI does inside sanctioned SaaS. Island said the new capital will fund platform expansion into modern SASE, applications and endpoints, and international growth from its Dallas headquarters.
Reporting based on coverage from GlobeNewswire, Calcalist and Reuters.