Nebius Group's shares jumped nearly 44 per cent to $91.75 on Tuesday, touching a record high as investors cheered its $17.4-billion deal supplying AI infrastructure to Microsoft over a five-year period. The agreement, which could expand to $19.4 billion if Microsoft increases demand, underscores the growing need for high-performance AI data centers amid a global rush to develop advanced generative artificial-intelligence technologies. The stock, which has more than doubled this year, surged 43.