One of the market's most famous investors just bet against a company Nvidia (NVDA) is backing: Nebius Group (NBIS). A few weeks ago, Nvidia disclosed a 9.3% stake in the company, sending NBIS stock up 16% in a single day. Over the past year, NBIS stock has increased 174%, far outperforming the S&P 500's ($SPX) 21% gain during the same period. Nebius Raises Outlook as AI Demand Continues to AccelerateNebius Group NV reported its first-quarter fiscal 2026 earnings on May 13. NBIS stock currently sits below the mean price target of $252, reflecting a 34% potential upside from here.