Nebius Shares Surge 11% After Ex-OpenAI Employee’s Fund Discloses 5.6% Stake

Bullish (0.9)Impact: High

Published on May 28, 2026 (3 hours ago) · By Vibe Trader

Nebius, a U.S.-listed AI cloud provider, saw its shares surge 11% in premarket trading following the disclosure that Situational Awareness, a hedge fund founded by former OpenAI researcher Leopold Aschenbrenner, has acquired 12.4 million Class A shares, representing a 5.6% stake in the company [1]. Situational Awareness is known for managing billions in funds and focuses on investing in the physical infrastructure necessary for the future of AI [1].

Nebius has experienced significant growth, with its stock up 149% year-to-date [1]. The company has established itself as a key AI compute provider in Europe and has recently secured several major partnerships. In March, Nebius entered into a $27 billion deal with Meta, under which it will provide $12 billion of dedicated capacity and up to $15 billion of additional compute capacity over five years [1]. Additionally, Nebius received a $2 billion investment from Nvidia in the same month, with the two companies set to collaborate on AI infrastructure deployment, fleet management, inference, and AI factory design and support [1].

The disclosure of Situational Awareness’s sizeable stake and Nebius’s recent high-profile deals have contributed to strong investor interest and a notable rally in the company’s share price [1].

CONCLUSION

Nebius’s shares jumped sharply after the disclosure of a significant stake by Situational Awareness, a fund led by a former OpenAI researcher. The company’s recent partnerships with Meta and Nvidia, along with its rapid stock appreciation, underscore its growing influence in the AI infrastructure market.

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Nebius Shares Surge 11% After Ex-OpenAI Employee’s Fund Discloses 5.6% Stake | Vibetrader