Island Raised $400 Million at a $6.4 Billion Valuation to Control AI Agents in the Enterprise

Island, the Dallas-based company behind the Enterprise Browser, raised $400 million in Series F funding at a $6.4 billion valuation on September 24, 2026. Evolution Equity Partners led the round, with participation from Sequoia, Coatue, Insight Partners, and others including a personal investment from CrowdStrike co-founder Dmitri Alperovitch.

The round follows a $250 million Series E in March 2025 at a $4.8 billion valuation — a $1.6 billion step-up in 18 months.

From browser to agent control plane

Island launched in 2022 pitching a secure enterprise browser. Its updated positioning is broader: a control layer for employees and AI agents operating inside organizations.

The company claims to have doubled annual recurring revenue every fiscal year since launch. Calcalist reported ARR around $200 million with roughly 1,000 employees.

Enterprise AI governance product

Island's Enterprise AI offering adds:

• Identity controls for agents
• Policy guardrails and human approval workflows
• Cost limits on agent spend
• Unified audit trails across browsers, devices, apps, networks, and data

The pitch is model-agnostic governance — whichever LLM providers a customer chooses.

Competitive landscape

Island is not alone. Neo raised $100 million in July 2026 to build agent control infrastructure. Cloudflare launched a browser for AI agents. Anthropic added data loss prevention hooks to Claude Enterprise.

The category reflects a clear enterprise pain point: agents are deploying faster than security architecture designed for human users can adapt.

Why investors care

Agent governance sits at the intersection of cybersecurity, compliance, and AI adoption — three budget lines expanding simultaneously in 2026. Island's browser footprint provides distribution for policies that must enforce at the point of action, not just in backend logs.

Takeaways for business leaders

If your organization pilots AI agents this quarter, pilot governance in the same sprint: identity, spend caps, data boundaries, and approval paths.

Island's funding validates that enterprises will pay for control planes. The open question is whether browsers remain the right enforcement surface as agents move to server-side and API-native workflows.

Either way, agent governance is now a venture-scale category — not a feature checkbox.