Key Highlights

  • Shares surged 47.73% over the week, closing at $277.68, including an 8.88% single day gain at Friday's close.
  • Second quarter Revenue reached $582.3 million, up 454% year over year, with adjusted EBITDA of $236.2 million compared to a loss in the same period last year.
  • Management said the company's AI cloud Data Center capacity for 2027 could sell out entirely, according to commentary from CEO Arkady Volozh.
  • The rally came even as at least one prominent investor disclosed a short position and flagged valuation concerns, while several analysts raised price targets following the report.

A Blowout Quarter Meets a Divided Market

Nebius Group N.V. (NASDAQ:NBIS) shares surged 47.73% over the week to close at $277.68, including an 8.88% single day gain at Friday's close, extending a rally sparked by second quarter results released earlier in the week. The Amsterdam headquartered AI cloud company, which operates large scale GPU compute clusters for AI Training and workloads, has emerged as one of the more closely watched names in the AI infrastructure buildout given its scale of revenue growth.

The rally stood out not only for its size but for the split reaction it generated, with bullish analyst upgrades running alongside public skepticism from at least one well known short seller, a combination that produced unusually high Volatility even within an already sharp weekly advance.

Revenue Growth Accelerates as Capacity Reportedly Sells Out

Second quarter revenue reached $582.3 million, up 454% from $105.1 million a year earlier, while adjusted EBITDA swung to a positive $236.2 million from a loss of $21.0 million in the same period last year. Six month revenue reached $981.3 million, up 529% year over year, with Net Income from continuing operations of $430.8 million for the first half, aided in part by an $780.6 million non-cash gain from the Revaluation of Equity securities.

Beyond the reported numbers, CEO Arkady Volozh's commentary that the company could sell out its entire 2027 data center capacity appeared to be a significant driver of investor enthusiasm, reinforcing the narrative of persistent, capacity constrained Demand for AI compute. The company also disclosed substantial Capital raising activity during the quarter, including $2.85 billion in proceeds from the sale of treasury shares and $2.0 billion from the issuance of pre funded warrants, funding a steep increase in capital expenditures that reached $5.66 billion for the quarter as the company builds out data center capacity.

Balancing Capacity Constrained Demand Against Valuation and Insider Selling Concerns

The durability of this week's rally will likely depend on whether reported demand for 2027 capacity translates into contracted revenue at the pricing and Margin levels investors are currently assuming, since qualitative commentary about sold out capacity is not the same as disclosed Backlog figures. Some market commentary during the week specifically flagged valuation concerns and reported insider selling activity alongside the rally, introducing a note of caution even as the stock continued to advance.

On the upside, the scale of capital available to the company, including billions raised through equity and Warrant issuances during the quarter, provides substantial resources to fund the aggressive data center buildout required to meet the demand management has described. Conversely, the company's heavy reliance on continued capital raises to fund capital expenditures, combined with a swing to a net loss from continuing operations of $190.4 million for the quarter alone once one time gains are excluded from certain comparisons, means the path to sustained profitability independent of revaluation gains remains a key question for investors to track in coming quarters.

Conclusion

Nebius Group's 47.73% weekly advance, punctuated by an 8.88% single day gain on Friday, reflects a market weighing extraordinary revenue growth and reported capacity constraints against valuation skepticism voiced publicly during the same week. Whether the rally proves durable will likely depend on whether 2027 capacity commitments convert into disclosed contracted revenue and whether the company's aggressive Capital Expenditure pace is matched by proportional cash generation, neither of which is yet fully confirmed. The reaction illustrates how a single quarter of extreme growth can simultaneously validate bulls and sharpen the scrutiny of bears in the AI infrastructure trade.