Island raises $400M Series F at $6.4B for agentic enterprise control

Island announced a $400 million Series F financing round that brings its valuation to $6.4 billion, more than doubling since 2024, led by Evolution Equity Partners.

TECH desk — employees and AI agents now share the browser, which is where company data actually moves. A $400 million round for software that can see both, and block a risky action while it happens, is how a security team keeps up when the old network gate cannot tell a person from an agent.

What the lede says the round is. Island, called the agentic control plane for enterprises, announced its $400 million Series F financing round, which brings the company’s valuation to $6.4 billion, more than doubling since 2024. Evolution Equity Partners led the round, with participation from existing and new investors. $400 million is the new check. $6.4 billion is the valuation the company states for the company after this round. It is not the amount raised. Four hundred million against 6.4 billion is about 6 percent. That percentage is this desk’s reading of the check against the stated valuation. It is not a sentence that says investors bought 6 percent of the company. More than doubling since 2024 means the 2024 figure the company is comparing against was less than half of 6.4, so under $3.2 billion. The page does not print that 2024 number. Do not file $3.2 billion as a 2024 valuation. A Series F is a later venture round, after earlier raises. The page does not print the amounts of those earlier rounds. Agentic, here, means software that can take a series of steps, not only answer one question. A control plane, here, is one layer that sets the rules for many tools. Those two glosses are this desk’s. The release prints the words. These lines are the lede’s.

Who the page names as writing the check. Evolution Equity Partners led. The body then names existing investors: Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, J.P. Morgan Growth Equity Partners, Alta Park Capital, Georgian, G Squared, and Squarepoint. They participated in the round, alongside another personal investment from cybersecurity entrepreneur Dmitri Alperovitch. Existing is the release’s word for that list. The lede’s phrase is existing and new investors. The lead, Evolution, is not in the existing list. Alperovitch is described as a personal investment, not as a fund. The page does not print another new fund’s name. Do not invent one. These names are the release’s. This desk did not read a subscription agreement.

What the money is for, in the release’s words. The funding will fuel the company’s next phase of growth and innovation as enterprises scale AI agents and modernize how work gets done. Island gives organizations the missing essential layer of visibility, control, and auditing they need to thrive in the AI age. Missing essential layer, and thrive, are the company’s words. The page does not print a product roadmap, a headcount plan, or a list of countries in that paragraph. Those details are not this sentence. This desk did not see a budget.

Richard Seewald, as a quote, not as a study. Richard Seewald, Founder and Managing Partner at Evolution Equity Partners, said enterprises are rethinking the basic architecture of work. He said Island meets the moment with a unique advantage: it can see and govern what people and agents are doing as they interact with applications and data, wherever that happens. He said Island has already shown it can create a category, displace legacy technologies, and accelerate customers' business transformation from the browser to the network. He said that by extending its vision to safeguard browsers, endpoints, networks, and data, Island built the essential control layer for the next generation of enterprise computing. An endpoint, here, is the laptop or other device a person uses. That gloss is this desk’s. Unique, category, and essential are his words. They are not a market-share study. Those are his sentences on the release. This desk did not interview him.

Mike Fey, as a quote, and the path the quote describes. Mike Fey, CEO and Co-founder of Island, said the company has entered a new era in which people and AI agents work side by side. He said that just like humans, agents need the right context, access, guardrails, and accountability to succeed. He said Island created the first Enterprise Browser to protect the primary place people work. From there, the company expanded into data protection and DLP, then built a next-generation SASE architecture from the endpoint outward. DLP, data loss prevention, is the work of stopping sensitive data from leaving. SASE, secure access service edge, is a way of securing the connection from the user’s device out to the apps, instead of only at an office firewall. Those glosses are this desk’s. The release prints the letters and does not spell them out. First is his word for the Enterprise Browser. This desk did not survey other browsers. He said those combined capabilities give CIOs, CISOs, and business unit owners one security, productivity, and governance framework for everywhere human and agentic work occurs. A CIO is the chief information officer. A CISO is the chief information security officer. Those glosses are this desk’s. He said this investment gives the company even more capacity to innovate with customers and help them safely scale AI. Those are his sentences on the release. This desk did not interview him.

The headcount and the revenue claim, and whose they are. Island employs 1,000 people and has doubled annual recurring revenue every fiscal year since its 2022 launch. The release spells out annual recurring revenue and then the letters ARR. ARR is the yearly value of subscriptions, as the company uses the term. Doubled every fiscal year is the company’s claim. The page does not print the dollar ARR, the fiscal-year end, or a customer count beside that sentence. A company growth claim is not an audit. This desk did not read the books. The same paragraph says the sustained growth reflects rising enterprise demand to accelerate AI adoption, redesign networks for end users, simplify security infrastructure, and protect sensitive data without adding friction for users. Those reasons are the release’s.

Gili Raanan, as a quote. Gili Raanan, Founder and General Partner at Cyberstarts, said Cyberstarts backed Island at the very beginning and has watched the team execute the vision into a full control plane for knowledge workers and AI agents. He said reaching a $6.4 billion valuation while doubling ARR each year is clear evidence that the entire Island team has built something the enterprise world genuinely needs for the agentic era. Clear evidence is his sentence. It is the same doubling claim as the body, in his words. It is not a new figure. Those are his sentences on the release. This desk did not interview him.

The recognition the release stacks under the announcement, and whose it is. Island was included on the CNBC Disruptor 50 list for 2026. The company page does not print a rank. Frost & Sullivan recognized Island as the 2026 Global Zero Trust Browser Security Company of the Year. Zero trust, in plain words, is the idea that a person or an agent is not trusted just because it is on the company network. That gloss is this desk’s. The award name is the release’s. This desk did not read the Frost & Sullivan report. Most recently, Island was named a Customers’ Choice in the 2026 Gartner Peer Insights Voice of the Customer for Secure Enterprise Browsers. A citation line on the page reads: Gartner, Voice of the Customer for Secure Enterprise Browsers, Peer Community Contributor, 18 August 2026. The page prints a registered mark on Gartner and a trademark mark on Peer Insights. 18 August 2026 is that citation line. It is not the date of this financing. Customers’ Choice is the release’s description of that report. This desk did not open the Gartner page, and it did not recount the reviews.

What the company says the product became. Island pioneered the Enterprise Browser category by embedding enterprise security, access, and productivity controls into the place where most knowledge work happens. An enterprise browser, here, is a browser the company ships with work rules built in, not a consumer browser left as-is. That gloss is this desk’s. The company has broadened that foundation to consumer browsers through an extension, as well as endpoints, applications, modern SASE, and data. The resulting agentic control plane applies one policy engine and one audit trail to the full chain of work activities, and provides a frictionless experience for end users. A policy engine is the set of rules that decides what is allowed. An audit trail is the record of what was done. Those glosses are this desk’s. One policy engine and one audit trail are the release’s. This desk did not open a customer tenant.

Dan Amiga, as a quote, and the five layers. Dan Amiga, CTO and Co-founder of Island, said agents do not operate in a single layer of the technology stack, so they cannot be governed from one. He said Island’s control plane unifies five critical layers: last-mile control, network, data, identity, and observability. Last-mile, here, means the last step, where the person or the agent actually touches the app. Observability means being able to see what happened. Identity means who, or what, is acting. Those glosses are this desk’s. He said together they tell the enterprise 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. He said this lets organizations see the full chain of activity and govern it in real time, not reconstruct it after the fact. Those are his sentences on the release. This desk did not interview him.

What the release says Enterprise AI does, and the Alperovitch quote. The result, the page says, is one place to onboard, govern, and audit AI across the human and agentic workforce. Island’s Enterprise AI enables organizations to deploy AI at scale, regardless of which models, applications, or agents they choose. Island offers identity governance, access, guardrails, data boundaries, human approvals, and cost governance, while providing a full audit trail across browsers, endpoints, the cloud, and internal resources. A guardrail, here, is a limit on what the agent is allowed to do. A data boundary is a line the data is not supposed to cross. Those glosses are this desk’s. The list is the release’s. Dmitri Alperovitch, identified in the quote as Co-founder and Chairman of Silverado Policy Accelerator and Co-founder and former CTO of CrowdStrike, said AI agents will break many of the assumptions that have supported network-based security for decades. He said security has to move to where the work actually happens, giving defenders the visibility to detect and stop dangerous actions in real time. He said Island was built for that shift, giving enterprises full visibility and control without slowing AI down. Without slowing AI down is his claim. It is not a measured delay. Those are his sentences on the release. This desk did not interview him.

What the about box says, and only that. Island is the agentic control plane for enterprises, where organizations govern people and AI agents as they work across devices, browsers, applications, networks, and data. Island gives agents the identity management, access, guardrails, cost controls, and auditability they need to operate safely at scale. Millions of users trust Island to protect sensitive information, simplify enterprise work, and reduce reliance on legacy infrastructure. Millions is the about box’s scale. The page does not print a user count beside that word. Island can be reached at info@island.io or (866) 832-7114. The press contact on the page is Dave Heffernan, dheffernan@methodcommunications.com, 401-864-4327, Method Communications for Island. Those lines are the about box and the contact line. This desk did not call that number.

What CNBC reported the same morning, and what is CNBC’s rather than the press page’s. CNBC published “Cyber startup Island hits $6.4 billion valuation in new round as AI attacks fuel spending wave,” by Samantha Subin, Thu, Sep 24 2026, 6:00 AM EDT. 6:00 AM EDT is 6:00 a.m. Eastern and 10:00 a.m. UTC. CNBC calls Island a Dallas-based browser security startup and says it announced a $400 million funding round at a $6.4 billion valuation on Thursday, led by Evolution Equity Partners. Mike Fey told CNBC, in an interview the press page does not print, that every old control is breaking, so everything is up for grabs, and that he has never seen anything like it. CNBC says Island plans to invest in research and development and to expand into new markets, including Europe, Asia, and the Middle East. Fey also told CNBC the company plans to scale its workforce from 1,000 to 1,500 employees by the middle of next year. The middle of next year is his phrase. The page does not print a month. 1,500 and those regions are the CNBC interview. They are not sentences on the company press page. CNBC says Island ranked No. 28 on this year’s CNBC Disruptor 50 list. No. 28 is CNBC’s rank. The company page says included on the list and does not print 28. Do not collapse them. CNBC says Island counts Pfizer, Chipotle, American Airlines, and major banks among its customers. Major banks is CNBC’s phrase. The page does not name those banks. CNBC also says the competitive landscape includes incumbents such as Palo Alto Networks and a roster of startups. Fey told CNBC the answer is a much better product. Those customer names, the rank, the regions, the 1,500, and the Palo Alto Networks sentence are CNBC’s. This desk did not interview Fey, and it did not confirm the customer list with those companies.

What Reuters reported the same day, through a regional reprint, and what is Reuters’s. The Mighty 790 KFGO page is headed “Cybersecurity startup Island valued at $6.4 billion amid AI agent security risks,” stamped Thomson Reuters, Sep 24, 2026 | 5:37 AM. The page this desk read does not print a time zone next to 5:37 AM. The body is “Sept 24 (Reuters)” and does not print an hour. Reuters says Island said on Thursday it raised $400 million in a funding round that valued it at $6.4 billion. Reuters says the latest funding values Island at more than 30 percent above its $4.8 billion valuation in a 2025 funding round. $4.8 billion and 2025 are Reuters’s. They are not sentences on the 24 Sep company page. Six point four is one third above 4.8. That fraction is this desk’s reading of 6.4 against the $4.8 billion Reuters prints. More than 30 percent is Reuters’s phrase. Do not merge the company’s “more than doubling since 2024” with Reuters’s 2025 figure into one valuation. They are two comparisons, from two sources, about two years. Reuters says the round was led by Evolution Equity Partners, with participation from existing investors Prysm Capital, Sequoia Capital, Coatue Management, Cyberstarts, Insight Partners, and J.P. Morgan Growth Equity Partners. That list is shorter than the company page. Reuters does not print Alta Park Capital, Georgian, G Squared, Squarepoint, or Alperovitch. Reuters repeats the company claim that Island employs 1,000 people and has doubled annual recurring revenue every fiscal year since its 2022 launch. Reuters says the company lists PayPal, Amazon, and Pfizer, among others, as customers on its website. Among others means Reuters is not offering a full list. PayPal and Amazon are Reuters’s, attributed to the company website. They are not names on the press page this desk read, and they are not the same list as CNBC’s. This desk did not open that customer page. The byline is reporting by Prakhar Srivastava in Bengaluru, editing by Shinjini Ganguli. Reuters’s background, not Island’s announcement, is that businesses are grappling with rogue AI agents, and that earlier on Thursday Australia said an OpenAI agent breached a government health data portal in June. That Australia statement is already filed as openai-australia-medicare-agent. It is Reuters’s context. It is not a sentence in Island’s release.

What the card shows, and what the words do not. The card is the Island Enterprise AI Browser product image: a browser window on a green landscape, with Ask Enterprise Chat, a prompt reading Summarize last call, a short summary of a customer call, a billing error, a credit-card line that is redacted, and an Embed any AI menu naming Copilot, Gemini, Grok, Claude, ChatGPT, and Enterprise Chat. The still has no date text. Those words are the graphic’s. The 24 Sep release does not print Summarize last call, the billing line, or the menu. Do not treat the still as a customer call this desk heard, and do not treat the redacted card as a number this desk read. The press page’s own social image is a logo lockup that reads Island and Evolution Equity. This filing does not use that lockup. The product page this desk read for the still is island.io/ai/ai-browser. It says organizations can embed any AI chatbot, naming ChatGPT, Copilot, Gemini, Grok, Claude, or their own, in the browser sidebar. It also says Island can redact sensitive data before it reaches any AI provider. That redaction sentence is the product page’s. It matches the blurred card on the still. It is not a sentence in the financing release. The address island.io/enterprise-ai returned 404 on the fetch this desk made. The image file this desk shipped is the product image from the company CDN, 1200 by 800.

Plain English for the rest of the card. A Series F is a later private round. $400 million is the new check. $6.4 billion is the valuation the company states. About 6 percent is this desk’s reading of the check against that valuation, not an ownership stake. More than doubling since 2024 is the company’s comparison. The page does not print the 2024 valuation. Under $3.2 billion is this desk’s reading of “less than half,” not a number the company printed. Reuters’s separate comparison is $4.8 billion in a 2025 round, and 6.4 is one third above that 4.8. One third is this desk’s. More than 30 percent is Reuters’s. ARR is annual recurring revenue. Doubled every fiscal year since 2022, and 1,000 employees, are company claims. 1,500 by the middle of next year, and Europe, Asia, and the Middle East, are what Fey told CNBC. No. 28 is CNBC’s Disruptor 50 rank. The company page only says Island was included on the 2026 list. DLP is data loss prevention. SASE is a way of securing access from the device outward. An enterprise browser is a work browser with the company’s rules built in. An audit trail is the record of the action. The five layers Amiga names are last-mile control, network, data, identity, and observability. 6:00 AM EDT is 6:00 a.m. Eastern and 10:00 a.m. UTC. The company page and its schema date do not print an hour. KFGO prints 5:37 AM with no time zone. 18 August 2026 is the Gartner citation line, not this round. Evolution Equity Partners led. Mike Fey is chief executive and co-founder. Dan Amiga is chief technology officer and co-founder. This filing is the 24 Sep Series F.

PRIMARY here: Island’s 24 Sep 2026 press page, datelined Dallas, September 24, 2026, with schema datePublished Sep 24, 2026 and no hour — Tier A PRIMARY, the company’s own announcement. STATUS PRIMARY. The $400 million Series F, the $6.4 billion valuation, more than doubling since 2024, Evolution Equity Partners as lead, the existing-investor list, Alperovitch’s personal investment, the Seewald, Fey, Raanan, Amiga, and Alperovitch quotes, the 1,000 employees, the doubled-ARR-since-2022 claim, the CNBC Disruptor 50 inclusion without a rank, the Frost & Sullivan award name, the Gartner Customers’ Choice sentence and the 18 August 2026 citation line, the enterprise-browser history, the five layers, the Enterprise AI list, and the about box are that page’s. CNBC’s 6:00 AM EDT story is the same-day independent report: No. 28, the 1,500 line, Europe, Asia, and the Middle East, Pfizer, Chipotle, American Airlines, and major banks, and the Fey interview quotes. Reuters, via the KFGO reprint, is the other same-day independent report: the $4.8 billion 2025 comparison, the shorter investor list, and PayPal, Amazon, and Pfizer as names Reuters says are on the company website. NOT claimed: a printed 2024 valuation, that $3.2 billion or about 6 percent or one third was printed by Island, that the check equals an ownership stake, a dollar ARR, a named new fund besides the lead, that this desk opened a customer tenant or read a contract, that the still is a real call, a card number, that 1,500 or the region list is in the press release, that No. 28 is the company’s sentence, that PayPal and Amazon are in the press release, that the Reuters customer line was checked on the website, a time zone for KFGO’s 5:37 AM, an hour on the company page, a stock tip, or investment advice. The card is the Enterprise AI Browser product UI. Distinct from the already-filed gurucul-ai-risk-response, feedzai-farol, autonomyai-discover-mode, and cyera-400m.