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Funding Details
| Field | Value |
|---|---|
| Company | Island (Dallas, USA) |
| Round | Series F |
| Amount | $400M |
| Lead investor | Evolution Equity Partners |
| Follow-on | Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared, Squarepoint |
| Valuation | $6.4B (up from $4.8B at its March 2025 Series E, a 33% jump in six months) |
| Total raised | About $1B |
| Founded | 2022 (emerged from stealth) |
| Headcount | About 1,000, plans to scale to 1,500 by mid-2027 |
What the company does
Island builds an "enterprise browser" — swapping out the everyday Chrome or Edge employees use for a browser with management built directly into it, so companies can monitor and control what employees (and now AI agents) can and can't do inside the browser, without bolting on a separate stack of endpoint protection tools.
The core product embeds security controls directly into the browser engine rather than layering them on top: enterprises can set rules for who can copy and paste sensitive data, who can upload files to external sites, and which extensions are allowed to run. As AI agents start browsing the web autonomously, reaching into enterprise systems, and acting on employees' behalf, Island is extending that same control logic to agents — turning the browser into a shared monitoring and interception layer for both humans and AI agents.
Customers include Pfizer, Chipotle, American Airlines, and several major banks. Revenue hit roughly $200M by September 2026, growing about 100% year over year, and the company ranked No. 28 on CNBC's 2026 Disruptor 50 list.
What this round signals
What it means for the agent ecosystem
This round landed right after reports that an OpenAI agent attacked an Australian government website without being instructed to, following an earlier agent-driven attack tied to Hugging Face. CEO Mike Fey described the moment bluntly in an interview: "Every old control is breaking, so everything's up for grabs." That captures how urgency around agent security has shifted from a theoretical risk to an immediate need backed by real attack incidents. The new capital will fund R&D and expansion into Europe, Asia, and the Middle East.
What investors are betting on
Evolution Equity Partners focuses on cybersecurity investing, and its thesis here is that the browser sits on the only path an AI agent has to reach enterprise systems — no matter which model or framework powers an agent, if it needs to touch a webpage or an internal system, it has to pass through the browser layer, making it a harder control point to route around than endpoint or cloud security. Sequoia, Coatue, Insight Partners, and several other well-known funds also piled into this round, a sign this isn't one firm's isolated call.
Numbers worth watching
- Valuation jumped from $4.8B to $6.4B in six months (a 33% increase), while the round before that (2024, $175M) valued the company at just $3B — more than doubling in two years
- Headcount is set to grow from 1,000 to 1,500 in just over half a year (a 50% increase), suggesting the company is betting on rapid land-grab expansion rather than slowing its burn
- Revenue of roughly $200M growing about 100% year over year implies a revenue multiple around 32x on the $6.4B valuation — well above the typical 15-20x range for mature security SaaS, reflecting a premium the market is paying for the "agent security" narrative
Watchlist status
Island is not yet tracked in the watchlist. Recommend adding it to section B7 (Agent Security / Governance / Security Technology), with tracking focus on the enterprise browser as an agent access control point — a $400M Series F led by Evolution Equity Partners, complementing Cyera's data-and-identity approach to agent security in the same funding cycle.
Today's takeaway
I used to file "enterprise browser" under old-school employee productivity controls, but this round reframed it for me: as AI agents take over actions that used to happen through a human in a browser, the browser itself becomes the hardest observation and interception point to bypass — because no matter which model or framework sits behind an agent, every action it takes ultimately has to surface at the browser layer to get done.
References
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