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Island has raised $400 million in a Series F round led by Evolution Equity Partners, valuing the enterprise browser security company at $6.4 billion, Reuters reports. The new financing gives substance to the earlier valuation signal and shows investors are putting serious money behind security tools aimed at businesses adopting AI agents.

Island says the round also includes existing investors including Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners and J.P. Morgan Growth Equity Partners. The company says it employs 1,000 people and has doubled annual recurring revenue every financial year since launching in 2022.

Island says the money will fund its next phase of growth as companies scale AI agents and modernise workflows. That is a sizeable vote of confidence, not proof that its products stop real attacks.

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