Island, a secure web browser for businesses, emerges from stealth with ~$100M from Sequoia, Insight, and others; sources say it was recently valued at ~$500M
A startup building a secure web browser for businesses is coming out of stealth mode after raising about $100 million across …
Context & Ripple Effects
This is the founding data point of what became one of enterprise software's fastest valuation climbs: Island's February 2022 stealth exit with ~$100M from Sequoia and Insight priced it around $500M, and every subsequent round repriced the same thesis upward — a $115M Series B at $1.3B seven weeks later, then $100M at $1.5B in October 2023, then $175M led by Sequoia and Coatue at $3B, and by early 2025 sources had it raising at $4.5B.
First-order effects
- Sequoia and Insight put ~$100M behind an unproven category — the secure enterprise browser — giving Island capital to build before competitors could react, with Alfred Lin and Pat Grady stewarding the bet amid Sequoia's leadership transition around Doug Leone.
Second-order effects
- The funding validates a second entrant, Here, which the Wall Street Journal later grouped with Island as startups betting enterprises want security controls and app integrations built into the browser itself rather than bolted on.
Third-order effects
- If the pattern holds, endpoint security consolidates toward the browser as the enforcement point — a structural shift where the browser vendor, not the OS or standalone security agent, controls what corporate users can access and how apps are delivered.
The trend: Enterprise security spending is migrating into the browser layer, with venture capital repricing dedicated enterprise-browser startups faster than almost any other security category.