Nebius Has $40 Billion of Customer Commitments. Most of It Comes From 2 Customers.

Nebius has about $40 billion in committed backlog, with Microsoft and Meta accounting for roughly $32 billion of firm contracts and up to $17 billion more in contingent capacity. Only 36% of the $37.5 billion backlog—about $13.5 billion—is expected to convert to revenue in the 24 months through June 2028, while management reaffirmed 2026 capital spending of $20 billion to $25 billion. The contracts offer payment protections, but delivery execution and customer concentration remain risks; the article argues Nebius’ roughly $64 billion valuation assumes broader customer growth than it has demonstrated.

Analysis

The key risk is not immediate cancellation: take-or-pay terms and upfront payments make the signed book more durable than ordinary backlog. The risk sits in delivery and financing. Nebius must convert long-dated commitments into operating capacity while only a minority of backlog is scheduled to become revenue over the next two years; a build delay or cost overrun could therefore arrive before the contracted cash flows do. Concentration also weakens the value of backlog as collateral if lenders haircut exposure to two counterparties or to undelivered capacity.

For Microsoft, committed payments reduce near-term revenue uncertainty at Nebius, but do not eliminate the possibility that capacity is underutilized or that Microsoft limits future orders. For Nebius, weak industry demand could perversely increase reliance on Meta’s capacity backstop, while reducing opportunities to diversify customers. Nvidia may benefit from the buildout only if platform deliveries and deployment proceed on schedule; a Vera Rubin delay would instead amplify Nebius’ execution risk.

The market question is whether new, non-hyperscaler contracts can validate the valuation embedded in continued growth—not whether the existing contracts are real. The backlog growth from other customers is encouraging but not yet enough to establish durable diversification. Over 1–3 months, watch new-customer backlog, delivery milestones, capex funding terms, and guidance. Over 6–18 months, conversion into revenue and cash flow matters more than headline bookings.

Key Decisions for Investors

• Keep NBIS underweight or avoid adding at current levels; the signed contracts support revenue visibility, but they do not by themselves establish the broader customer base and cash generation needed to justify expectations of repeated large wins.
• For a relative-value expression, consider a modest short NBIS / long NVDA pair only if the next earnings update shows weak customer diversification or delivery slippage. Size conservatively: both legs retain exposure to AI infrastructure demand, and Nvidia’s benefit depends on successful deployments.
• Do not treat the contracted backlog as equivalent to near-term cash flow. Reassess after the next report for non-Microsoft/Meta backlog contribution, capex funding and borrowing terms, and any revisions to delivery schedules or revenue-conversion guidance.
• Falsify the cautious thesis if several consecutive quarters show material backlog additions from diverse customers, on-time capacity delivery, and improving conversion into revenue and cash flow without materially worsening financing terms.