AI stock surges after an ex-OpenAI employee’s fund disclosed a stake

AI stock surges after an ex-OpenAI employee’s fund disclosed a stake

AI stock surges after an ex-OpenAI employee’s fund disclosed a stake

https://www.cnbc.com/2026/05/28/nebius-situational-awareness-ai-stock-ex-openai-stake.html

Publish Date: 2026-05-28 05:30:00

Source Domain: www.cnbc.com

  • Nebius, a Dutch cloud provider spun out from Yandex, has seen significant activity and growth related to its provision of GPUs for AI model training.
  • Situational Awareness, a hedge fund associated with ex-OpenAI researcher Leopold Aschenbrenner, disclosed owning a substantial 5.6% stake in Nebius, amounting to 12.4 million Class A shares.
  • Nebius has experienced strong stock performance, with a 149% increase year-to-date and an 11% surge in premarket trading after the stake disclosure.
  • The company has solidified its position as a major AI compute provider in Europe, forming several strategic partnerships, including a notable $27 billion deal with Meta for compute capacity.
  • In March, Nebius secured a $2 billion investment from Nvidia, leading to collaboration on AI infrastructure projects, fleet management, and AI factory design.