Investing.com -- Nebius Group NV (NASDAQ: NBIS) shares rose 11% Thursday after Situational Awareness, an investment firm founded by former OpenAI researcher Leopold Aschenbrenner, disclosed a 5.6% stake in the Dutch neocloud company.

The stake was revealed in a regulatory filing late Wednesday, marking another AI-focused investment for Aschenbrenner's firm.

Amsterdam-based Nebius builds data centers designed to train AI models and run services like ChatGPT.