Dallas-based startup Island has announced a substantial $250 million Series E funding round, led by Coatue, which values the company at a staggering $4.85 billion. This marks a significant milestone for the nearly five-year-old enterprise browser startup, which has now raised a total of $730 million in funding.

The latest investment brings Island's valuation up by more than 67% in just 11 months, following a $175 million Series D round that valued the company at $2.9 billion. The rapid growth in valuation is a testament to the startup's innovative approach to enterprise browser security and its increasing appeal to businesses.

Island's browser is designed specifically for enterprises, offering enhanced security features such as universal application access control, device visibility and management, and application automation. These features aim to provide a more secure browsing experience for corporate users, protecting them from potential cyber threats.

The company's unique value proposition has attracted significant attention from investors, including Insight Partners, Sequoia, and Canapi Ventures, who participated in the latest funding round. Sequoia partner Doug Leone, who co-led the Series D round, praised Island's team and vision, citing the founders' ability to create a secure browser that meets the needs of both consumers and corporations.

Island's customer base has grown substantially, with 450 enterprises now using its browser, including notable clients such as Mattress Firm, Swiss Life, and Fiverr. The startup's rapid growth and adoption are a clear indication of the demand for secure enterprise browsing solutions.

The latest funding round will likely enable Island to further expand its operations, enhance its product offerings, and continue to innovate in the enterprise browser space. As the company continues to grow, it will be interesting to see how it addresses the evolving cybersecurity landscape and meets the increasingly complex needs of its corporate clients.

TechCrunch reached out to Island for additional information on its plans and strategies following this significant funding round. The company's response will be updated accordingly.

In conclusion, Island's $250 million Series E funding round is a significant milestone for the startup, solidifying its position as a leader in the enterprise browser market. As the company continues to innovate and grow, it will be exciting to see how it shapes the future of secure corporate browsing.