Nebius Group N.V. (NBIS) stock surged 50% pre-market following the announcement of a monumental $17.4 billion AI infrastructure agreement with Microsoft. This deal, a significant milestone for NBIS, could potentially expand to $19.4 billion, promising to reshape the company's growth trajectory. Microsoft's choice to collaborate with NBIS underscores a broader strategy to diversify its AI infrastructure partnerships, validating NBIS's industry position and positioning it for substantial future growth in the AI cloud sector beyond 2026.