Nebius Faces $25 Billion Test as Insiders Dump Stock and Short Interest Hits 24%

Nebius stock quadrupled over 12 months, but insiders sold 17 times with zero purchases, even as massive AI orders from Meta and Nvidia fuel a $25B capex plan. Can the business keep up?

The stock has more than quadrupled over the past year, yet Nebius insiders are selling with both hands while short sellers hold their biggest bearish bet in months. Shares of the AI infrastructure group closed Tuesday at €241.95, a whisker away from the €261.00 record set on June 22 — the same day the company officially joined the Nasdaq-100 index. The contradiction raises a sharp question: can the underlying business grow fast enough to justify the valuation when those closest to the operation are taking profits?

Insiders Unload as Rally Accelerates

Directors and executives have been steadily reducing their holdings. On June 15, board member Boynton John Wilson IV sold 5,812 shares, leaving him with 428,098. Marc Boroditsky disposed of roughly 11,000 shares on June 2 at around $276 each — a sale that represented 29% of his direct stake at the time. Over the past twelve months, Nebius has recorded 17 insider sales and not a single purchase.

The selling stands in contrast to the stock’s momentum. The equity has risen 6.06% in the past week alone and 6.67% over the month. The RSI sits at 60.9, suggesting room to run before becoming technically overbought. Yet the insider exodus is well known to the market, and it has done nothing to slow the advance — total shareholder return over twelve months stands at 469.13%.

The Bull Case: Index Inclusion, Massive Orders, and Nvidia’s Stamp of Approval

What is driving the rally? First, the Nasdaq-100 rebalancing triggered forced buying from passive funds and ETFs that track the index. Second, Nebius reported explosive growth: first-quarter revenue hit $399 million, a 684% year-over-year jump, with its AI Cloud segment surging 841% to $389.7 million. Analysts have taken notice. BofA’s Tal Liani raised his price target on June 8 from $240 to $280, reiterating a buy recommendation on the back of rising demand for AI compute.

The company’s order book backs up the optimism. A five-year agreement with Meta Platforms is worth $27 billion. Nvidia invested $2 billion in March, securing Nebius early access to next-generation Blackwell and Vera Rubin architectures. Microsoft has also signed several multi-billion-dollar deals. Management raised its 2026 capital expenditure target to $20–$25 billion — a stunning figure for a company that was carved out of Yandex just months ago.

A $25 Billion Capex Clock Starts Ticking

Turning that mountain of spending into recurring revenue is now the central challenge. Nebius aims to build more than four gigawatts of contracted capacity by the end of the year, including a £1.7 billion investment in UK cloud infrastructure announced last month. Revenue guidance for the current year sits at $3.0–$3.4 billion, with a longer-term run-rate target of $7–$9 billion by year-end. The company also wants to maintain an adjusted EBITDA margin of roughly 40% while spending at this pace.

The operational risks are considerable. Large parts of the capacity pipeline are still under construction — the 310-megawatt facility in Finland is a prime example. Any delay in bringing those clusters online would pressure the revenue forecast and open the door for a rapid de-rating. The stock already trades 111% above its 200-day moving average of €114.30, an extreme deviation that signals technical overheating. The 30-day annualized volatility is nearly 100%, leaving the stock vulnerable to sentiment shifts in the technology sector.

Short Sellers Circle at 23.8% of Float

Around 50.93 million shares are sold short, equivalent to 23.8% of the float. That level of bearish positioning is unusually high for a company that just entered a major index and continues to post triple-digit revenue growth. Short sellers are betting that the premium valuation — supported by GPU scarcity and a unique EU-focused AI story — will eventually deflate as competitors ramp up capacity and construction delays materialize.

The immediate downside support is the 50-day moving average at €186.83, roughly 30% below the current price. A break above the all-time high of €261.00 would require a fresh catalyst; the next major one is expected in the second half of the year, when the first Blackwell Ultra instances go live in new Nebius facilities.

For now, the stock sits 7.11% below that record level, with the index kick, the Nvidia alliance, and the Meta contract all providing fundamental ballast. But the insider selling and the massive short position are flashing yellow lights. Nebius has the orders and the capital. The question is whether it can execute fast enough to turn the single biggest capex pipeline in its short history into sustainable, recurring revenue.