Microsoft ends Nscale's Loughton data center deal weeks after the IPO filing: what the S-1 says about customer risk
The Telegraph reports Microsoft terminated its agreement for a UK site. Nscale's own prospectus shows how much of its business rests on a few customers, and which Microsoft contracts the report does not touch.
Microsoft has ended its agreement for a data center in Loughton, Essex, being developed by AI cloud company Nscale, according to a report in Britain's Telegraph on Sunday. Reuters, which relayed the report, says Microsoft is one of Nscale's two largest customers, that the Telegraph gave no reason for the withdrawal, and that neither company had responded to its requests for comment. Bloomberg and the Financial Times carried the story under similar headlines.
We have not seen a statement from either company, so everything below about the withdrawal itself is the Telegraph's account as relayed by Reuters. The timing matters because Nscale filed to list on the New York Stock Exchange on September 18, and we covered that filing when it came out.
What the prospectus says, and does not say
We went back to the S-1 to see how exposed the company is. Three points stand out.
- Concentration. The filing says its largest customer accounted for 52% of revenue in the first half of 2026 and 73% in 2025, and that for 2024 a single customer accounted for substantially all of it. The filing text we read does not name that customer.
- The Microsoft contracts it describes are elsewhere. The S-1 says statements of work with Microsoft provide for payments of up to approximately $43.8 billion through December 2033, with optional extensions subject to delivery and availability requirements. It ties Microsoft to a Portugal campus (a planned deployment of more than 66,000 Nvidia Vera Rubin NVL72 GPUs starting in late 2027) and an existing deployment of more than 12,600 Grace Blackwell Ultra GPUs. We found no mention of Loughton in the filing, so we cannot say how the UK site relates to those contracts, and nothing reported so far says they are affected.
- Delivery risk is a stated risk. The filing warns that at sites needing a utility connection, Nscale "may encounter delays in securing such connection," and says some customer contracts allow termination if delivery timelines are missed. It names Anthropic's tranches specifically, and does not say whether Microsoft's contracts carry the same right.
Why this reaches beyond one UK site
The neocloud group, which includes CoreWeave and Nebius, has been under pressure; our Friday wrap covers that selloff. For a company with no public price yet, the question investors will ask is whether the Loughton exit is a one-site problem or a sign that customers will walk when a build runs late. The filing cannot answer that, and the first pricing range, which the original filing did not include, will show how the market weighs it.
It also matters to the businesses downstream. Electricians, builders and equipment suppliers that win work on these campuses are paid against schedules, and a cancelled anchor tenant can leave a half-built site without a paying customer.
What to watch
Whether Microsoft or Nscale comments on the record, whether Nscale files an amendment to its S-1 disclosing the change, and whether the Portugal and other Microsoft work is described as unchanged. Markets are closed for the weekend, so any share-price reaction would come when trading resumes.
Sources: Reuters via Investing.com, reporting The Telegraph; Nscale Form S-1 (SEC EDGAR); Bloomberg (headline only). This is market information, not investment advice.
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