Two cybersecurity companies closed $400 million rounds in the same week, and an AI data specialist added $350 million, a cluster that shows where late-stage money is still willing to write large checks.
What Happened
Crunchbase's roundup of the largest U.S. deals in the week of September 25 put Island and Cyera at the top. Island, which builds a secure enterprise browser and tools for corporate digital work, raised a $400 million Series F led by Evolution Equity Partners. The Dallas company is now valued at $6.4 billion, more than double its 2024 mark.
Cyera, a New York data-security vendor whose product governs data used by both people and AI agents, took $400 million in a Series G extension led by Evolution Equity Partners with Goldman Sachs Growth Equity. Crunchbase put Cyera's total funding at $2.7 billion after the extension.
Snorkel AI, based in San Francisco, raised $350 million in a Series E. The company sells tools that help frontier labs and enterprise AI teams build specialized training data and task environments. The same week included large checks in drug discovery and neurotech, but the security and data names dominated the top of the list.
Why It Matters
Investors have spent 2026 arguing about whether AI infrastructure spending can pay for itself. These rounds are a bet on a narrower claim: the bill for securing AI, and the data it touches, is still early. Island sells control of the browser, the place where employees and agents now do most of their work. Cyera sells control of the data those agents read and write. Snorkel sells the pipeline that makes a general model useful on a private task.
The valuations are doing different jobs. Island's jump past $6 billion says the enterprise browser is no longer a niche alternative to Chrome plus a stack of extensions. Cyera's cumulative $2.7 billion says data security for agents is being priced like a platform, not a feature inside a legacy DLP product.
Industry Impact
Incumbents are already buying or building into this gap. CrowdStrike has pushed its own agentic detection stack. Palo Alto has been rolling next-generation security revenue into the same budget line buyers use for AI governance. A $400 million primary round does not replace that distribution, but it gives Island and Cyera room to hire and to stay independent longer.
For customers, the practical effect is more vendor noise in two reviews that used to be simpler: browser policy, and where sensitive data is allowed to go once an agent can reach it. Procurement teams should expect both companies to show up in 2027 shortlists next to the suites they already own.
Snorkel's raise sits one layer down. Labs and large enterprises that do not want to depend only on a foundation-model vendor for task data now have a better-funded supplier. That matters if open-weight and closed models keep splitting the work.
What's Next
Watch whether Island uses the round to expand beyond the browser into agent gateways, and whether Cyera's extension is a bridge to a listing or another late-stage raise. Snorkel's Series E will be judged on whether frontier-lab revenue holds up once those labs slow external data spend.
The funding tape is not broad. It is concentrated in security and in the picks-and-shovels of model training. That is the opposite of a scattershot AI boom, and it is where the next set of large checks is likely to land.
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