Cyber startup Island hits $6.4 billion valuation in new round as AI attacks fuel spending wave

Businesses are increasingly targeted by rogue AI agents (AI systems operating without proper control), driving demand for new security tools like Island's browser security platform. Island, a Dallas-based startup, raised $400 million at a $6.4 billion valuation as companies rush to strengthen defenses against these threats, with the company planning to expand its workforce and enter new markets.