Nebius Faces a $15 Billion Gap as Wall Street Questions the Math Behind the AI Buildout

Nebius plans $16B-$20B in capex for 2026 with $530M in sales, backed by $46B in contracts from Meta and Microsoft, but insider selling and control weaknesses raise risks.

The arithmetic at Nebius Group is raising eyebrows across Wall Street. The company is spending like a hyperscaler while generating revenue like a startup, and the disconnect has become the central tension ahead of its May 13 earnings report.

The Capital Conundrum

Nebius plans to deploy between $16 billion and $20 billion in capital expenditures for 2026, with nine data centers under construction across the United States and Europe. The goal is ambitious: expand capacity from 170 megawatts to as much as one gigawatt. But the revenue side of the equation tells a different story. Full-year 2025 sales are expected to land at $530 million, climbing to a projected $3 billion to $3.4 billion for 2026.

That works out to roughly $5 to $6 in spending for every dollar of anticipated revenue — a ratio that has analysts divided on whether the company is building a fortress or digging a hole.

Management insists the math works. Around 60% of the investment outlay is expected to be funded through operations and existing cash reserves, with the remainder financed through debt. But the operating cash flow generated last year was just $402 million, leaving a chasm of roughly $15 billion between what Nebius generates and what it plans to spend.

The Customer Backstop

What gives the story credibility is the order book. Nebius has secured approximately $46 billion in contracted backlog, anchored by a $27 billion deal with Meta and a $19.4 billion commitment from Microsoft. NVIDIA has also chipped in with a $2 billion equity stake. The annual recurring revenue (ARR) base stood at $1.25 billion at the end of 2025, representing a 127% sequential jump.

The company is betting that customer prepayments and advances will cover roughly $11 billion of the capital needs. The May 13 earnings call will serve as the first real test of whether that funding strategy is gaining traction.

Governance Gaps and Insider Activity

A less visible but potentially significant risk emerged in the annual 20-F filing on April 30, 2026. Nebius disclosed material weaknesses in its internal controls, specifically around fixed asset accounting and revenue recognition. Until those deficiencies are remedied — management has set a year-end 2026 deadline — the company faces elevated risk of undetected errors and potential constraints on capital market access.

The insider trading pattern adds another layer of concern. Over the past three months, insiders have sold roughly $15 million worth of shares. Not a single insider purchase was recorded during that period.

Analyst Sentiment: A House Divided

The valuation debate is playing out in starkly different price targets. Wolfe Research initiated coverage with a "Peer Perform" rating, praising the strong demand from Meta and Microsoft but flagging execution and financing risks. The firm's fair value range of $80 to $170 is unusually wide, reflecting the uncertainty baked into the Nebius investment case.

Goldman Sachs remains the most bullish on the Street, lifting its price target to $205. Freedom Capital Markets, however, downgraded the stock to "Hold" despite raising its target to $154, citing valuation concerns.

The enterprise value currently sits at roughly $46 billion, implying a rich multiple on the projected $3.4 billion in full-year revenue. The market is pricing in a steep growth trajectory, and any misstep could trigger a sharp re-rating.

What to Watch on May 13

First-quarter 2026 revenue is expected to come in at $388.6 million, a 600% year-over-year surge. Analysts are forecasting a loss of 81 cents per share, as depreciation on the rapidly expanding asset base continues to weigh on earnings.

The critical question is whether management can reaffirm the ARR trajectory toward $7 billion to $9 billion for the full year. Investors will also be looking for operational updates on the Meta and Microsoft deployments, along with initial commentary on integrating the recently acquired Eigen AI platform.

Nebius has also raised its target for contracted power capacity to over three gigawatts, with plans to bring up to one gigawatt of new capacity online by year-end. The stock is trading at all-time highs, having surged nearly 600% over the past year. The bar for the May 13 report is set correspondingly high.