Fluidstack reportedly closed $1.5 billion at an $18 billion valuation -- for a company that owns no chips of its own

Fluidstack, the AI-infrastructure company that builds and operates GPU data centers for Anthropic and other frontier labs, has closed a $1.5 billion private-equity round led by Jane Street Capital at an $18 billion valuation, according to reporting from Crunchbase News, Forbes and Tech Times in the first days of September 2026. Fluidstack has not confirmed the round, its size, its lead investor, or the new valuation -- the company has issued no funding announcement of its own so far this year, for this round or any before it.

What makes the figure notable isn't only its size. Fluidstack doesn't manufacture chips, and it doesn't own most of the physical sites its business runs through either. It is a neocloud: an operator that aggregates GPU capacity by contracting into, or buying stakes in, data centers that other companies already own, then resells that capacity to AI labs under multi-year deals rather than owning the power and land itself. Its backers across earlier rounds include Jane Street, the Situational Awareness fund, Stripe co-founders Patrick and John Collison, former GitHub chief executive Nat Friedman, and investor Daniel Gross -- a syndicate closer to hedge funds and AI-adjacent angels than to traditional infrastructure investors. Its named customers span the frontier-lab roster: Anthropic is the anchor, with Meta, Mistral AI, Poolside and Black Forest Labs also reported as clients.

The clearest paper trail for how that model actually works sits in a securities filing, not a Fluidstack press release. TeraWulf, a Nasdaq-listed company that mines bitcoin and leases data-center capacity, disclosed in a Form 8-K that it sold its 50.1% stake in a 168-megawatt joint venture in Abernathy, Texas, to Fluidstack for roughly $450 million -- "at a premium to invested capital," in the filing's own words. That Abernathy campus is one of two sites Anthropic named when it announced a $50 billion, multi-year infrastructure commitment built with Fluidstack on November 12, 2025, alongside a second site in New York; Anthropic said the buildout would create about 800 permanent jobs and 2,400 construction jobs, with sites coming online through 2026. The commitment is one piece of a much larger push by Anthropic to lock up US compute capacity across several partners this cycle.

"Fluidstack was built for this moment. We're proud to partner with frontier AI leaders like Anthropic to accelerate and deploy the infrastructure necessary to realize their vision." -- Gary Wu, Fluidstack co-founder and CEO, on the November 2025 Anthropic partnership

Fluidstack's valuation has moved quickly all year, and every step before this one is itself only reported, not confirmed. Bloomberg reported the company in talks in April 2026 for a $1 billion round targeting this same $18 billion figure; a smaller $750 million round at a $7.5 billion valuation closed first, in July, before the fuller number materialized in September. Google was separately reported in February 2026 to have discussed investing $100 million at that $7.5 billion price -- one of the plainer signs a hyperscaler was already watching Fluidstack's climb before this round put a bigger number on it. Across every round reported since its 2019 seed, Fluidstack's disclosed funding totals roughly $2.6 billion -- most of it, on this reporting, raised in the last twelve months. (Fluidstack was spun out of Oxford and has since moved its headquarters to New York; in March 2026 it withdrew from a proposed €10 billion AI-infrastructure project in France, a rare instance of the company scaling back rather than up.)

Forbes' reporting on the new price places Fluidstack among the largest independent GPU-cloud operators, grouped alongside CoreWeave and Nebius -- both of which, unlike Fluidstack, are publicly listed and file audited quarterly financials that any investor can check against the stock price. That comparison is also where the gap sits: a CoreWeave or Nebius shareholder can measure the multiple against a disclosed number every quarter. A Fluidstack investor is pricing a private company on reported figures the company itself has not confirmed, in an industry where reported late-stage rounds have shrunk or slipped before closing more than once this year.

The revenue side of that gap is where the reporting genuinely disagrees, and the disagreement changes the story. An $18 billion price against Sacra's most recently dated estimate of Fluidstack's revenue -- $180 million in annualized run rate as of December 2024, itself up sharply from $25 million a year earlier -- works out to roughly 100 times revenue, a multiple that would be extreme even by this year's AI-infrastructure standards, where investors already pay well ahead of delivered capacity. A different, widely reported figure of $660 million in projected revenue would cut that multiple to a more ordinary-looking 27 times -- the difference between a valuation priced mostly on Anthropic's name and one priced on Fluidstack's own growth. Neither figure carries a stated methodology from Fluidstack itself.

None of this makes Fluidstack's business fake. Anthropic's $50 billion commitment and the Abernathy filing are real money moving through real paperwork, independent of anything Fluidstack itself has said. What remains unconfirmed is the number everyone is now quoting: an $18 billion price with no company statement behind it, for a business whose entire model is owning less of the infrastructure than the number implies.