Nebius Shares Jump Over 10% Following Fund's Stake Acquisition

By EC Assets · Published 28 May 2026

Nebius shares increased significantly in premarket trading after a fund established by a former OpenAI employee disclosed a stake in the AI infrastructure firm. The investment from Leopold Aschenbrenner's hedge fund, Situational Awareness LP, led to a surge in Nebius stock. Nebius Group's shares climbed over 10% in premarket trading on Thursday. The stock rose 12.44% in after-hours trading. This rise pushed Nebius to new all-time highs. Situational Awareness LP, founded by Leopold Aschenbrenner, a former OpenAI researcher, bought a 5.6% ownership stake in Nebius. Situational Awareness LP disclosed a $2.6 billion stake in Nebius. This investment contributed to an 11% surge in Nebius Group's shares in overnight trading. The company's market capitalization is moving closer to that of CoreWeave, a market leader. Situational Awareness also holds stakes in other companies. This article is intended for informational purposes only. It does not constitute investment advice.