Nebius Group is trading at $247.96 (+4.47%) after William Blair initiated coverage with an Outperform rating; the report linked the initiation to a premarket gain, while the live move is larger. - William Blair cited Nebius Group’s potential as a differentiated AI-native cloud platform. - An upcoming October 1 price increase for selected GPU cloud services was noted as a sign of demand, alongside last week’s BNP Paribas upgrade. The live move is not attributed solely to any one catalyst.