Nebius Plans $20-25B 2026 Capex, Leans on Customer Prepayments to Fund AI Buildout

What happened

Nebius Group plans $20-$25 billion in capital expenditures for 2026, a massive ramp from the $8.13 billion spent in the first half. The company expects more than $9 billion in customer prepayments to help fund this AI infrastructure expansion, covering roughly 40% of the planned capex. The remaining funding must come from debt, equity, or other sources, building on the $4.34 billion in convertible notes, $2.0 billion NVIDIA-linked warrant, and $775 million secured loan already raised this year. While prepayments reduce near-term funding pressure, they create deferred revenue obligations and do not eliminate the need for additional capital. Execution risk remains high given the scale of the buildout, customer concentration, and the company's premium valuation.

Implication

The $20-25 billion capex plan is aggressive and will likely strain the balance sheet despite the expected prepayments. Customer prepayments above $9 billion are a positive signal of demand but may not be sufficient; management has already indicated the need for additional debt or equity. The stock's premium valuation leaves little room for delays in capacity deployment or funding gaps. Key metrics to watch include quarterly deferred revenue growth, capex pacing, and any new equity issuance announcements. A prudent stance is to wait for evidence that capacity is coming online on schedule and that prepayments are actually covering a substantial share of the capital needs.

Thesis delta

The article confirms the existing thesis that Nebius is funding aggressive expansion via customer prepayments, but the full-year capex figure of $20-25 billion is larger than previously implied and reinforces the need for external financing. This does not change the WAIT rating; it heightens the focus on execution and capital stack discipline, as prepayments cover only part of the spend and the company still relies on debt and equity.