Nebius Group Surges 11%, Leopold Aschenbrenner Discloses 5.6% Stake

Nebius Group (NBIS) shares rose more than 11% in after-hours and pre-market trading.

Situational Awareness LP disclosed a 5.6% stake in the AI infrastructure and cloud company.

The fund reported ownership of 12.41 million Class A shares.

This investment is valued at approximately $2.6 billion based on the last closing price.

Former OpenAI researcher Leopold Aschenbrenner leads the AI-focused hedge fund.

Situational Awareness is now one of the largest institutional investors in Nebius.