Hedge fund billionaire Stephen Mandel made Nebius his largest portfolio holding in Q2 2026.
Nebius is an AI cloud provider that grew revenue 454% year-over-year in Q2.
Analysts project 523% growth in the second half of 2026 and 258% in 2027.
What happened
Hedge fund manager Stephen Mandel, who runs Lone Pine Capital, made Nebius (NBIS) his largest portfolio holding in Q2 2026 after not owning it in Q1, according to Form 13F filings. Nebius is an AI-focused cloud computing provider (neocloud operator) and a preferred Nvidia partner.
Why it matters
Nebius grew revenue 454% year-over-year in Q2 2026, driven by deals with major AI hyperscalers renting computing capacity; analysts expect 523% growth for the second half of 2026 and 258% growth for 2027. A billionaire investor adding a stock as his largest holding signals confidence that the company can sustain rapid growth in a market where AI computing power remains scarce.
What to watch
Nebius stock rose nearly 200% in 2026 through June 30. The company's ability to maintain its preferred Nvidia partnership and secure computing capacity will determine whether it can meet analyst projections for the second half of 2026 and beyond.
Ask the AI about this article →
Stephen Mandel's move to make Nebius his largest portfolio holding in Q2 signals conviction in the company's positioning within a critical market gap. The article emphasizes that a shortage of AI computing power creates structural demand for providers like Nebius, which has secured deals with major AI hyperscalers. Mandel's track record as a diversified investor—not purely a tech specialist—adds weight to the decision. The timing aligns with Nebius's exceptional 454% revenue growth in Q2 2026, a figure the article stresses came from organic expansion of computing capacity, not acquisitions or one-time gains. Analyst projections for sustained triple-digit growth (523% in H2 2026, 258% in 2027) suggest the market expects demand for AI compute to remain strong, making a preferred Nvidia partner a structurally advantaged player.
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