Fluidstack was unknown a year ago and now investors are chasing an $18 Billion valuation

Fluidstack‘s ascent from European underdog to one of the most talked-about names in AI infrastructure has been fast enough to make even seasoned investors do a double take.

The startup, which builds data centers purpose-built for AI workloads, is currently in talks to raise a $1 billion funding round at an $18 billion valuation, according to Bloomberg. Jane Street is reportedly in discussions to lead the round. If the deal closes on those terms, it would more than double the company’s valuation from where it stood just a few months ago, when Fluidstack was reportedly seeking around $700 million at a $7.5 billion valuation in December.

The speed of that revaluation reflects something larger happening in AI infrastructure. Demand for compute capacity is outpacing what traditional cloud providers can comfortably absorb, and companies like Anthropic are increasingly looking for purpose-built alternatives rather than sharing resources across general-purpose hyperscalers. That shift is precisely what Fluidstack has positioned itself to serve.

The clearest signal of that positioning came in November, when Anthropic signed a reported $50 billion agreement with Fluidstack to build custom data centers in Texas and New York. For a startup that had been relatively under the radar in the United States, the deal represented an enormous vote of confidence from one of the most closely watched AI companies in the world. Anthropic relies heavily on AWS and Google Cloud for its existing infrastructure, but its growth trajectory now demands more dedicated capacity and greater control over its own compute environment.

The partnership carried enough weight to reshape Fluidstack‘s entire strategic direction. The company, originally spun out of Oxford and well regarded within Europe’s AI ecosystem, relocated its headquarters from the United Kingdom to New York. It also stepped back from a major European AI infrastructure project in France, choosing instead to concentrate on opportunities in the United States.

Beyond Anthropic, Fluidstack counts Meta, Poolside, and Black Forest Labs among its customers, and it built much of its earlier reputation supplying infrastructure to Mistral. The customer list spans some of the most active builders in the current AI landscape.

For a company that few outside Europe had heard of not long ago, the trajectory is difficult to ignore. The infrastructure layer of the AI industry is attracting serious capital, and Fluidstack is sitting close to the center of it.