Browser security startup Island raises $400M at $6.4B valuation to defend against rogue AI agents - Tech Startups
Browser security startup Island raises $400M at $6.4B valuation to defend against rogue AI agents - Tech Startups
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September 24, 2026
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Browser security startup Island raises $400M at $6.4B valuation to defend against rogue AI agents
Nickie Louise
Posted On September 24, 2026
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Browser security startup
has raised $400 million at a $6.4 billion valuation as companies confront a new security problem: AI agents that can browse websites, access corporate systems, handle files, and take actions with far less human supervision.
The Dallas-based startup announced the funding Thursday, with Evolution Equity Partners leading the round. Island plans to use the new capital for research and development and international growth across Europe, Asia, and the Middle East. The company expects to grow from roughly 1,000 employees to 1,500 by mid-next year.
The latest funding comes just six months after Island’s Series E round. TechStartups featured the company in March when the cybersecurity startup
raised $250 million at a $4.8 billion valuation
amid growing demand for secure enterprise browsers. The new round lifts Island’s valuation by $1.6 billion in just half a year.
The timing is hard to miss. Companies spent years securing what employees could do inside a browser. AI agents are changing that equation by introducing software that can perform many of those same actions on a user’s behalf.
“Every old control is breaking, so everything’s up for grabs,” Island CEO and co-founder Mike Fey
told CNBC
. “I’ve never seen anything like it. It’s a very special time.”
That conce