Nebius Group is trading 3.07% lower at $9.15, with no clear negative company-specific catalyst identified for September 25, 2026. - BNP Paribas Exane upgraded the stock to Outperform with a $399 price target; the bullish news reported around September 24–25 does not directly explain today’s decline. - Broader markets are modestly higher, limiting support for a market-wide explanation. - Profit-taking or trading volatility after a recent advance may be factors, but available reporting does not establish either as the cause.