Markets are off to a sluggish start this week. The S&P 500 and Dow Jones Industrial Average are both trending lower shortly after Monday's trading session opened. But cloud computing stock Nebius Group (NBIS 14.22%) is moving decisively in the other direction, thanks to an analyst's auspicious outlook on the stock.As of 11:01 a.m. ET, shares of Nebius are up 11.2%. Shares have soared in 2025 -- and one analyst thinks they're not done rising yetInitiating coverage on artificial intelligence (AI) stock Nebius ...