Billionaire Stephen Mandel Invests Heavily in Nebius Group: AI Stock Soars Over 200% in 2026
The latest round of Form 13Fs filings reveals insights into the holdings of elite investors, including billionaire Stephen Mandel of Lone Pine Capital. Known for his diversified portfolio and exceptional returns, Mandel’s Q2 move captures attention: he added a new stock to his portfolio and elevated it to his largest position.
This strategic decision signals urgency, as Mandel’s confidence in a company often prefigures market-moving potential. The unnamed stock has become his top holding, warranting closer scrutiny.
*Missed Nvidia in 2009? This Rare Signal Is Flashing Again.* In 2009, a “Double Down” signal emerged for Nvidia, a then-emerging chipmaker. Now, a similar “Total Conviction” alert has materialized for a company just 1% the size of Nvidia.
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Nebius: An AI Cloud Powerhouse Ignites Growth
Nebius (NASDAQ: NBIS) has surged over 200% in 2026, emerging as one of the year’s standout performers. Despite a late-July correction, its AI-driven cloud infrastructure has fueled explosive growth. Preliminary 13F data suggests Mandel’s Q2 investment aligned with the stock’s April rally, which has since been validated by its market-beating trajectory.
Operating in the neocloud niche—specializing in AI and cloud computing—Nebius is positioned at the center of a critical bottleneck: global demand for AI compute power vastly outstrips supply. As a preferred partner of Nvidia, Nebius secures early access to cutting-edge hardware and frameworks, cementing its competitive edge. The company has also secured agreements with major AI hyperscalers to lease computing capacity, driving revenue growth at breakneck speeds.
Q2 results showcased 454% year-over-year revenue growth, a testament to its scalable infrastructure. Analysts project even steeper gains, forecasting 523% growth for the remainder of 2026 and 258% growth in 2027. With AI adoption accelerating across industries, Nebius’ vertically integrated model positions it as a linchpin in the AI supply chain.
While Nebius’ stock has tripled in 2026, its growth fundamentals suggest sustained upside. Investors are advised to evaluate its strategic partnerships, revenue scalability, and leadership in AI infrastructure—criteria that align with Mandel’s proven investment philosophy.
Nebius: A Missed Opportunity? Insights from a Proven Advisor
Before investing in Nebius, consider this: The Motley Fool’s Stock Advisor team has identified 10 high-conviction stocks for 2026, none of which include Nebius. These selections prioritize long-term capital appreciation, with past recommendations like Netflix (2004) and Nvidia (2005) delivering 429x and 1,318x returns, respectively.
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*Stock Advisor returns as of August 22, 2026.*
Disclosure: Keithen Drury holds positions in Nebius Group and Nvidia. The Motley Fool maintains holdings in and endorses Nvidia. Full disclosure policies are available here.
This article was repurposed from The Motley Fool’s original coverage.
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