Why Did Nebius Stock Jump 20% in June?

Nebius Group, an AI cloud infrastructure provider, surged nearly 20% in June driven by explosive growth metrics including expanded power capacity guidance (1 GW to 4+ GW), a new Pennsylvania AI factory securing 1.2 GW, and a partnership with Bloom Energy. Revenue has accelerated from $105M in Q2 2025 to a $1.25B annual run rate, with management projecting over $3B in 2026 revenue. However, the stock crashed similarly in early July, and investors should expect continued volatility given the lofty valuation and competitive pressures from rivals like CoreWeave.