Not another browser unicorn print. The raise is Island selling a control plane for people and AI agents — and asking the market to underwrite that the Enterprise Browser was the beachhead, not the end state.
On September 24, 2026, Dallas-based Island Technology Inc. announced a $400 million Series F that brings its valuation to $6.4 billion — “more than doubling since 2024,” per the company GlobeNewswire release (06:30 ET). Evolution Equity Partners led. Existing investors named in the primary: Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared, and Squarepoint, plus another personal check from cybersecurity entrepreneur Dmitri Alperovitch. The release also cites “new investors” without naming the full new-money list — treat unnamed new capital as Undisclosed beyond the lead.
What the money is buying — company framing. Island positions as “the agentic control plane for enterprises.” CEO and co-founder Mike Fey (GlobeNewswire): people and AI agents now work side by side; agents need context, access, guardrails, and accountability. The product arc in the same primary: pioneered the Enterprise Browser, then broadened into a consumer-browser extension, endpoints, applications, modern SASE, and data / DLP. CTO and co-founder Dan Amiga: the control plane unifies five layers — last-mile control, network, data, identity, and observability — so the enterprise sees who or what is acting, what it can reach, what data it can use, what it is doing, and whether that action should be allowed. Alperovitch’s quote in the release is the thesis in one line: AI agents will break many assumptions that supported network-based security for decades; security has to move to where the work happens.
Growth claims: cadence only, dollars Undisclosed. Island employs 1,000 people and has doubled annual recurring revenue (ARR) every fiscal year since its 2022 launch (GlobeNewswire primary). Dollar ARR and revenue: Undisclosed. CyberMerge will not import secondary revenue guesses. Recognition named in the PR: CNBC Disruptor 50 2026; Frost & Sullivan 2026 Global Zero Trust Browser Security Company of the Year; Gartner Peer Insights Customers’ Choice for Secure Enterprise Browsers 2026 — the release carries the standard Gartner Peer Insights disclaimer; this is the company’s claim, not a Gartner endorsement.
Secondary color — attributed only. CNBC (Sep 24) reports Fey plans to scale the workforce from 1,000 to 1,500 by mid next year and to put capital into R&D and expansion (Europe, Asia, Middle East). That headcount ramp is CNBC’s interview claim; it is not in the GlobeNewswire body. CNA (Reuters syndication, Sep 24) puts the $6.4B mark at more than 30% above a $4.8 billion valuation in a 2025 round — secondary math on a prior mark (per CNA); 2025 round terms: Undisclosed. Same-day mood, not Island causal: CNA notes Australia’s report that an OpenAI agent breached a government health data portal in June — already on the CyberMerge Breaking desk as agent-risk color. Island’s raise is not tied to that incident.
POV. Evolution Equity and the returning bench are paying for a category expansion story: one policy engine and one audit trail across browser, endpoint, SASE, and data — applied to human and agentic work. That is a serious underwrite question, not a press adjective. Boards should ask whether Island can actually govern agent actions in real time across those five layers, or whether “agentic control plane” is a rebrand riding Enterprise Browser momentum and a double-ARR cadence with no published dollar ARR. The browser was the beachhead. Agents are the product claim. Underwrite the control-plane architecture; revenue stays Undisclosed until Island publishes it.
Underwrite sheet — sourced only: $400M Series F; $6.4B valuation; more than doubling since 2024 (Island GlobeNewswire Sep 24, 2026 06:30 ET); Evolution Equity Partners lead; existing named investors + Alperovitch personal (same primary); “new investors” otherwise unnamed; Dallas; agentic control plane / Enterprise Browser → extension / endpoints / SASE / data arc (company); Fey + Amiga + Seewald + Raanan + Alperovitch quotes (PR); 1,000 employees; doubled ARR every FY since 2022 — dollar ARR / revenue Undisclosed; CNBC: 1,000→1,500 by mid next year + R&D/geo expansion (attributed); CNA: >30% above $4.8B 2025 mark + same-day Australia OpenAI Medicare portal color (attributed, not causal); CTech secondary revenue and bank-count claims omitted — not primary-verified; share% / full new-investor list Undisclosed. Browser beachhead. Agents are the product claim.