Nebius Group shares surge 11% as former OpenAI researcher Leopold Aschenbrenner takes major stake
2 Sources
[1]
Nebius shares jump as former OpenAI employee's fund buys stake
Situational Awareness managed $13.67 billion as ā of March 31, representing 148% growth from the end of 2025. It is run by Aschenbrenner, who was previously part of the "Superalignment" team at OpenAI. AI infrastructure firm Nebius Group's shares climbed over 10% in premarket trading on Thursday, after Situational Awareness, a fund run by a former OpenAI employee ā named Leopold ā Aschenbrenner, became its biggest shareholder. The gains put the stock on track to open at its highest in over two weeks. The fund reported a 5.6% stake in ā Nebius, worth nearly $2.6 billion as of Wednesday. US MarketsPowered By As on 28 May 2026, 08:44 PM IST S&P 500 Top Gainers Dollar Tree112.73(17.59%) Agilent Technologies135.04(16.57%) Best Buy Co74.83(15.94%) Axon Enterprise433.94(10.89%) Gainers" S&P 500 Top Losers Coterra Energy32.56(-8.62%) Synopsys483.61(-8.05%) Tyson Foods62.61(-5.17%) Norfolk Southern310.46(-4.67%) Losers" Situational Awareness managed $13.67 billion as ā of March 31, representing 148% growth from the end of 2025. It is run by Aschenbrenner, who was previously part of the "Superalignment" team at OpenAI. The team, which worked to ensure AI stays aligned with human values, has been disbanded since. The Nebius bet marks ā a vote of confidence in the company as a key player in the AI infrastructure race. Earlier this month, Nebius reported a nearly eightfold rise in quarterly revenue.
[2]
Nebius Group stock jumps after Aschenbrenner stake disclosed By Investing.com
Investing.com -- Nebius Group NV (NASDAQ:NBIS) shares rose 11% Thursday after Situational Awareness, an investment firm founded by former OpenAI researcher Leopold Aschenbrenner, disclosed a 5.6% stake in the Dutch neocloud company. The stake was revealed in a regulatory filing late Wednesday, marking another AI-focused investment for Aschenbrenner's firm. Amsterdam-based Nebius builds data centers designed to train AI models and run services like ChatGPT. This article was generated with the support of AI and reviewed by an editor. For more information see our T&C.
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Nebius Group shares climbed over 10% in premarket trading after Situational Awareness, an investment firm run by former OpenAI researcher Leopold Aschenbrenner, disclosed a 5.6% stake worth nearly $2.6 billion. The investment marks a significant vote of confidence in the AI infrastructure market as Nebius reported an eightfold rise in quarterly revenue.
Former OpenAI Employee Takes Major Position in AI Infrastructure Firm
Nebius Group shares experienced a stock surge of over 10% in premarket trading on Thursday after Situational Awareness, an investment firm founded by former OpenAI employee Leopold Aschenbrenner, disclosed a 5.6% stake in the Amsterdam-based AI infrastructure company
1
. The Aschenbrenner stake, revealed in a regulatory filing late Wednesday, is valued at nearly $2.6 billion as of Wednesday's close, making Situational Awareness the biggest shareholder in Nebius Group2
.
Source: ET
Situational Awareness Fund's Rapid Growth
The investment firm managed $13.67 billion as of March 31, representing a remarkable 148% growth from the end of 2025
1
. Aschenbrenner, who previously worked on OpenAI's Superalignment team focused on ensuring AI models stay aligned with human values, has positioned his fund aggressively in AI-focused investments. The Superalignment team has since been disbanded, but Aschenbrenner's expertise in AI safety and development continues to influence his investment strategy.Nebius Group's AI Infrastructure Business
Nebius Group builds data centers specifically designed to train AI models and run services like ChatGPT
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. The Dutch neocloud company has demonstrated strong financial performance, reporting a nearly eightfold rise in quarterly revenue earlier this month1
. This explosive revenue growth underscores the increasing demand for specialized AI infrastructure as companies race to deploy large language models and other AI applications.Related Stories
Market Implications and Future Outlook
The Nebius shares jump put the stock on track to open at its highest level in over two weeks, signaling strong investor confidence
1
. The investment marks a vote of confidence in Nebius Group as a key player in the AI infrastructure market, particularly as competition intensifies among providers serving the computational needs of AI development. With Aschenbrenner's deep understanding of AI capabilities and infrastructure requirements from his time at OpenAI, his fund's substantial position suggests he sees significant long-term potential in Nebius's ability to capture market share in this rapidly expanding sector. Investors should watch how Nebius deploys capital to scale its data centers and whether it can maintain its revenue momentum amid growing competition from established cloud providers entering the AI infrastructure space.References
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