Island Raises $400M Series F, Valuation Hits $6.4B as Enterprise Browser Pushes Deeper into DLP

Island, the enterprise browser vendor that has been steadily expanding into data protection, closed a $400 million Series F that values the company at $6.4 billion — more than double where it stood in 2024. Evolution Equity Partners led the round, joined by existing backers Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, and Insight Partners.

What’s notable for buyers watching the DLP and DSPM markets isn’t just the size of the check — it’s how Island describes its own evolution. Per the company: “Island created the first Enterprise Browser to protect the primary place people work. From there, we expanded into data protection and DLP, then built a next-generation SASE architecture from the endpoint outward.” That’s a deliberate positioning statement, not an incidental detail: Island is telling the market that browser isolation is now a legitimate enforcement point for DLP-grade controls, sitting alongside endpoint agents and network/CASB inspection.

This matters because enterprise browsers have historically been sold as an access/isolation play (stop malware, control SaaS access) rather than a full data-loss-prevention substitute. Island’s raise — one of the largest in the browser-security category to date — signals investor conviction that the browser can absorb meaningful DLP and SASE budget, particularly as organizations extend controls to agentic AI workflows where the browser (or embedded agent surface) is often the first place sensitive data leaves a sanctioned boundary.

Competitively, expect this to put pressure on other enterprise browser and SSE vendors to bundle DLP-grade classification and policy enforcement rather than partnering it in — a dynamic already visible in Akamai’s earlier acquisition of LayerX. For DSPM and endpoint DLP vendors, Island’s growing war chest and stated ambition to compete “from the endpoint outward” is worth watching as a potential channel-shift story over the next 12–18 months.