Nebius Group (NBIS) shares soared 16.13% during Thursday's intraday trading session, building on earlier pre-market gains as investors reacted to a confluence of positive catalysts.

The surge was fueled by sustained capital inflows into cloud computing and Neocloud concept stocks, with Nebius attracting significant funding interest. Fundamental tailwinds included NVIDIA's disclosed 9.3% passive stake totaling approximately 22.26 million shares, and Baird's initiation of coverage with an Outperform rating alongside a consensus analyst target price of $270.80. Additionally, Nebius published its 2025 Sustainability Report, highlighting an average data center PUE of 1.25—well below the global industry average of 1.54—which reinforced confidence in the company's operational efficiency as it scales AI cloud capacity toward multiple gigawatts.

The broader Systems Software sector also showed strength, with peers like Microsoft and Fortinet posting significant gains, further underpinning the positive sentiment for AI infrastructure and cloud computing names.