Enterprise browser startup Island has successfully raised $250 million in a Series E funding round led by Coatue, increasing its valuation to $4.85 billion. This funding brings Island's total capital raised to $730 million. The company specializes in developing secure online browsers tailored for enterprises, boasting features like universal application access control and device management. With 450 customers, including Mattress Firm and Fiverr, Island's growth trajectory has impressed investors. Just 11 months ago, it raised $175 million at a valuation of $2.9 billion.