⚠ Customer Concentration & Customers-as-CompetitorsHigh threat

The sharpest risk in CoreWeave is the combination of extreme customer concentration and the fact that its biggest customers are also its most capable competitors. Microsoft accounted for roughly two-thirds of 2025 revenue, and the top two customers for around 65%¹; the enormous backlog leans on a handful of giant names — Microsoft, OpenAI, Meta. Concentration this severe means CoreWeave's fortunes rest on the continued goodwill and spending of a few counterparties, each of whom holds enormous leverage over its pricing, terms, and survival. The loss, reduction, or renegotiation of even one major relationship would strike the business hard, and a business where two customers drive most of the revenue is fragile by any standard.

What makes the concentration doubly dangerous is who the customers are. The hyperscalers that dominate CoreWeave's revenue — Microsoft above all — are simultaneously building their own vast AI infrastructure, and their long-term strategic interest is to insource what they now rent, so that they own rather than enrich a competitor. CoreWeave is valuable to them today mainly as a fast supplement while their own capacity catches up; as it does, the logic points toward reduced reliance. Meanwhile OpenAI, another huge counterparty, is a heavily loss-making company whose multi-billion-dollar commitments depend on continually raising new capital — so a critical pillar of the backlog carries acute credit risk. CoreWeave is thus concentrated in customers who are variously its competitors (building to replace it), its entangled financial partners (in the circular web), and in one case a cash-burning counterparty whose ability to pay is uncertain.

CoreWeave is genuinely working to diversify — ten clients now committed to over $1 billion each, the single-customer share down from around 72%² — and the direction is encouraging; a broader base would materially strengthen the business. But diversifying among a handful of giant, entangled AI players reduces single-name risk without escaping the fundamental exposure to a few enormous, powerful counterparties whose interests do not durably align with CoreWeave's. The concentration is the clearest reason the moat is thin: CoreWeave's largest customers are the richest companies in the world, they are building to compete with it, and they hold the leverage — a structural vulnerability that easing concentration mitigates at the margin but cannot resolve, and that would turn devastating if the giants meaningfully reduced their reliance or a fragile counterparty failed.