Nebius Group N.V. (NASDAQ:NBIS) saw its shares jump 15.9% to $220.71 in Monday afternoon trading, adding roughly $7.7 billion to its market capitalization. The rally, which occurred without any new company-specific announcements, was part of a broader upswing across AI infrastructure stocks. CoreWeave (CRWV), IREN (IREN), and Core Scientific (CORZ) all posted significant gains, signaling renewed optimism in the sector.
The positive sentiment was fueled by fresh enthusiasm for cloud computing and AI-related technologies. Reuters highlighted Nebius and CoreWeave as top performers in the session. However, beneath the surface, investors are grappling with a more complex financial picture tied to the company's use of customer prepayments to fund its aggressive expansion.
Prepayments: A Double-Edged Sword
In the first quarter, Nebius reported operating cash flow of $2.26 billion, but this figure was heavily influenced by a $3.20 billion inflow from deferred revenue—essentially advance payments from customers. When excluding this line item, operating cash flow would have been negative $940 million. The company's capital expenditures reached $2.47 billion, leading to a post-capex shortfall of approximately $3.41 billion when prepayments are stripped out.
While prepayments are a positive signal of demand and help finance costly GPU deployments, they also make the timing of contract conversions critical. The company's remaining performance obligations stood at $33.6 billion as of March, but only 29% of that is expected to be fulfilled within the next two years, underscoring the importance of delivery schedules.
Strong Operational Momentum
Despite the cash flow complexities, Nebius's operational performance has improved dramatically. Revenue surged 684% year-over-year to $399 million in Q1, while adjusted EBITDA turned positive at $129.5 million. Cost of revenue as a share of sales dropped from 49% to 26%, reflecting improved efficiency as the business scales.
CEO Arkady Volozh emphasized robust demand, stating in May that "several customers compete for every GPU we bring online." The company's balance sheet remains solid, with $9.30 billion in cash against $8.45 billion in total debt as of March. In July, Nebius secured $775 million in senior secured debt at SOFR plus 2.50%, backed by GPUs and contracted cash flows.
Valuation and Execution Challenges
At the current share price, Nebius trades at 17.5 times the midpoint of its 2026 revenue guidance and 7.0 times its year-end ARR target. To hit the midpoint of its revenue outlook, the company would need to average $934 million in quarterly revenue from Q2 through Q4—2.34 times its Q1 level. Monday's rally has raised the bar for meeting those ambitious targets.
Risks include potential difficulties in securing power, hardware, and funding, as well as managing debt and dilution. Some deferred revenue may be subject to refunds, and capacity delays could pressure margins and cash flow. Investors will be watching closely when the company reports Q2 earnings on August 12 before the market opens, followed by a conference call at 8:00 AM EDT.
