Nebius Stock Surges 170% in 2026 as Leopold Aschenbrenner Acquires 5.6% Stake: The Reasons Behind the Move

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Leopold Aschenbrenner, a notable German AI researcher and investor with a background at OpenAI, has acquired a 5.6% stake in the cloud-based AI infrastructure company Nebius (NASDAQ: NBIS) through his Situational Awareness fund. This investment comes despite Nebius’ stock already rallying nearly 170% this year and trading at 19 times its projected sales.

Nebius, which rebranded from Yandex after divesting its Russian assets in 2022, reported a revenue surge of 351% to $530 million in 2025. Analysts anticipate a 242% CAGR, projecting revenues to reach $21.2 billion by 2028, largely driven by contracts with Meta and Microsoft, as the AI market expands. These factors position Nebius as a promising player within the rapidly growing neocloud sector, offering cost-effective and efficient AI solutions compared to traditional platforms like AWS and Microsoft Azure.

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