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AI Investor Takes 5.6% Stake in Nebius Group
28 May
Summary
- Situational Awareness disclosed a 5.6% stake in Nebius Group.
- Leopold Aschenbrenner founded Situational Awareness hedge fund.
- Nebius Group shares rose 11.47% in after-hours trading.

Following the market's closing on Wednesday, Situational Awareness revealed its beneficial ownership of approximately 12.41 million Nebius Group shares. This acquisition represents a significant 5.6% stake in the company. The hedge fund, Situational Awareness, was founded by Leopold Aschenbrenner, a former OpenAI researcher.
Aschenbrenner gained prominence for identifying crucial AI bottlenecks years in advance. His hedge fund has experienced rapid growth, expanding from $225 million to $13.7 billion in assets under management in under two years. This impressive performance, with top holdings yielding between 100% and 800%, has positioned Aschenbrenner as a key figure in AI investing.
In response to this major investment news, Nebius Group shares saw a substantial increase. The stock experienced an 11.47% surge in after-hours trading. At the time of reporting, NBIS shares were trading at $232.48.