Nebius Group N.V. (Nebius Group (NBIS)) shares are on a tear again Tuesday, extending a rally that has been fueled by a potent mix of institutional backing, sovereign-level infrastructure deals, and a high-profile nod from the king of AI hardware. The stock hit $278.10 in premarket trading, up 5.14%, even as broader index futures pointed slightly lower.

So, what's behind the latest leg up? Let's break it down.

BNP Paribas Weighs In

Adding to the momentum, BNP Paribas initiated coverage on Nebius Tuesday with a Neutral rating and a price target of $255. That's a bit below where the stock is trading now, but the very fact that a major bank is putting a spotlight on the company adds a layer of credibility. The initiation comes on the heels of Nebius's record-breaking quarterly results, which have clearly caught Wall Street's attention.

A Hedge Fund With AI Pedigree Takes a Stake

Perhaps the most intriguing catalyst is a recent SEC filing. Hedge fund Situational Awareness LP, run by former OpenAI researcher Leopold Aschenbrenner, disclosed a 5.6% passive stake in Nebius. The fund holds 12,410,060 Class A ordinary shares. When someone with Aschenbrenner's background in AI makes a bet of this size, the market tends to take notice. It's a strong signal that insiders see Nebius as a key player in the AI infrastructure buildout.

France Goes All In on AI

The institutional interest aligns with massive sovereign expansion plans. During the 2026 Choose France summit, French President Emmanuel Macron confirmed Monday that Nebius and SoftBank Group Corp. (SoftBank (SFTBY)) have chosen France for a combined 53 billion euros ($61.7 billion) AI push. Nebius alone plans to invest more than 8 billion euros in cloud infrastructure, targeting 240 megawatts of capacity. That's a lot of computing power.

SoftBank CEO Masayoshi Son framed the investment in grand terms: "AI is entering a new era, and the countries that build the infrastructure for this transformation will shape the future of technology, industry and society."

Jensen Huang's Shoutout

Nebius also got a massive credibility boost from NVIDIA Corp. (NVIDIA (NVDA)) CEO Jensen Huang. During his Computex keynote in Taipei on Monday, Huang highlighted Nebius as a key partner. "We worked with Nebius, and they are growing incredibly fast," Huang said, displaying both companies' logos on a slide. When the most important figure in AI hardware name-drops your company, it tends to move the stock.

What the Charts Say

All this good news has pushed Nebius shares well into overbought territory. The stock is trading about 35.9% above its 20-day simple moving average of $204.26 and a staggering 144.4% above its 200-day SMA of $113.56. The 20-day SMA is above the 50-day SMA, and the 50-day is above the 200-day — two bullish crossover signals that confirm the longer-term uptrend is intact.

But momentum is the near-term question. The Relative Strength Index (RSI) sits at 73.86, which is in overbought territory. That doesn't mean the stock is about to crash, but it does suggest that the recent pace of gains may not be sustainable.

Here are the key levels to watch:

• Key Resistance: $278.10 (Tuesday's premarket high)
• Key Support: $204.26 (20-day SMA)

If the stock can hold above $278, it could run further. But a pullback toward the 20-day SMA wouldn't be surprising, either. For now, the story is undeniably bullish, but the technicals suggest caution for anyone thinking of chasing the move.