Shares of Nebius Group N.V. (NASDAQ:NBIS) are rallying sharply during Thursday’s trading session. The upward price action follows a major regulatory filing revealing significant institutional backing from a prominent artificial intelligence insider.

According to a Schedule 13G filed with the Securities and Exchange Commission (SEC), hedge fund Situational Awareness LP disclosed a 5.6% passive stake in Nebius Group. The fund, managed by former OpenAI researcher Leopold Aschenbrenner alongside co-portfolio manager Carl Shulman, reported holding 12,410,060 Class A ordinary shares.

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Based on current market valuations, this position is worth approximately $2.6 billion. The event requiring the filing occurred on May 19, with the document officially signed and credited on Wednesday.

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