S-1 risk factors: when the investor is also the customer
Nscale and SB Energy's S-1 filings show how AI-infrastructure IPOs disclose customer concentration when the biggest backer is also the biggest buyer.
Two S-1 filings landed in Zorro's IPO pipeline within days of each other this month, and both disclose a version of the same structural risk: the company's largest financial backer is also, in effect, its largest commercial counterparty. Nscale filed its S-1 for a NYSE listing on September 18, and SB Energy amended its own S-1 on September 21 — and reading the "customer concentration" language in each one is a useful lesson in what these disclosures are actually built to warn investors about.
What Nscale's risk factors say
Nscale, a London-based GPU-infrastructure builder, disclosed H1 2026 revenue up roughly 1,252% year-over-year to $140.6 million, against a net loss of $1.02 billion. That growth is anchored by a single relationship: an August 2026 agreement to supply Anthropic with dedicated GPU capacity at an eight-gigawatt campus, a deal reported at $44.6 billion in total value. Together, Microsoft and Anthropic account for roughly 85% of Nscale's disclosed $103 billion in total contract value — which is precisely the kind of concentration an S-1's risk-factors section exists to flag. The filing doesn't just note the size of the Anthropic deal; it discloses that Anthropic's commitment is contingent on Nscale securing financing, and that Anthropic retains the right to cancel if Nscale misses milestones the filing itself describes as "stringent." A backlog number that large reads as a strength on the cover page and as a dependency in the risk factors — both are true at once, which is exactly why the section exists.
SB Energy's cover page, rewritten
SB Energy's amendment is a cleaner example of the same dynamic playing out in real time. The company's original S-1 disclosed Nvidia's investment further back in the document; the amended version, filed September 21, moved a fuller accounting of Nvidia's stake — a total of $3 billion, split between a $1.5 billion private placement of nonvoting shares priced at 90% of the eventual IPO price and a separate $1.5 billion prepaid forward contract — up onto the cover page itself. That's not a cosmetic edit. Prospectus cover pages are the one part of an S-1 the SEC scrutinizes most closely for prominence, and pushing an investor's stake to the front signals that regulators wanted it impossible to miss. Nvidia isn't a passive check-writer here, either: it has separately guaranteed that SB Energy's Ohio campus will exclusively host Nvidia AI compute, layering a capacity commitment on top of the equity stake. OpenAI holds warrants valued near $5.5 billion tied to that same campus. Two of the company's most consequential relationships are simultaneously capital sources and demand sources — and SB Energy's own numbers show why that matters: its $439 billion contracted backlog is a headline figure, but only about $1 billion of it is expected to convert to actual revenue over the next 24 months, a gap between "signed" and "collectible" that's easy to gloss over without reading past the summary.
Why the overlap cuts both ways
An investor who is also a customer isn't automatically a red flag — it can be a credibility signal, since a counterparty willing to put capital behind a company it's also buying from is putting real money on its own commercial judgment. But the risk-factors section exists precisely because that signal has a flip side: the same counterparty that validated the business also holds outsized leverage over it. If Anthropic exercises its cancellation right, or if Nvidia's guaranteed capacity commitment isn't renewed, the effect on the applicable company's revenue isn't diversified away across dozens of smaller customers the way it would be in most businesses — it's concentrated in the one relationship that also shows up in the capitalization table. That's a structurally different risk profile than a customer-concentration disclosure from, say, a retailer whose top account is a distributor with no equity stake at all.
Reading for the pattern
The practical habit worth building: when an S-1's cover page or "Prospectus Summary" highlights a named strategic investor, cross-reference that name against the customer or revenue-concentration language deeper in "Risk Factors" and against the "Certain Relationships and Related Party Transactions" section. If the same name appears in both places, the company is disclosing — because it's legally required to — that its growth story and its capital structure are more intertwined than the topline numbers alone suggest. It's a slower read than skimming the valuation and the raise size, but it's the section built to answer the question those headline numbers can't: what happens to this company's numbers if that one relationship changes. Both Nscale and SB Energy remain pre-listing, so neither company's public trading history exists yet to test how the market prices that risk; once either lists, its first few quarters on Zorro's recent IPOs board will be the first real read on it. For a walk through a different line item on the same prospectus cover page — the fee underwriters collect for pricing and placing the deal — see how the underwriting discount works.