Key Takeaways
- • Situational Awareness LP, the AI-focused hedge fund led by former OpenAI researcher Leopold Aschenbrenner, disclosed a 5.6% passive stake in Nebius Group (NASDAQ: NBIS) valued at approximately $2.6 billion, making it the company's largest shareholder.
- • Nebius shares surged between 7% and 9% on the disclosure, with the stock reaching near its 52-week high as investors responded positively to validation from a prominent AI infrastructure investor.
- • Nebius delivered exceptional first-quarter 2026 results with revenue of $399 million (up 684% year-over-year) and narrower-than-expected net losses of $100.3 million, prompting management to raise full-year 2026 guidance.
- • The company has expanded AI infrastructure capacity significantly, including a new Pennsylvania data center and a fuel cell capacity agreement with Bloom Energy, positioning it to capture growing demand for AI computing resources.
- • Nebius stock has appreciated 130% year-to-date and 420% over the trailing twelve months, reflecting strong investor appetite for neocloud providers that rent AI computing capacity; Aschenbrenner's fund also maintains bearish positions in semiconductor names including Nvidia, Broadcom, Oracle, and AMD.
Summary
Nebius Group's shares reached near 52-week highs following disclosure that Situational Awareness LP, an artificial intelligence-focused hedge fund managed by Leopold Aschenbrenner (a former OpenAI researcher), has accumulated a 5.6% passive stake in the cloud infrastructure provider. The position, valued at approximately $2.6 billion at the previous close, establishes Situational Awareness as Nebius's largest shareholder and signals confidence from a sophisticated AI investor in the company's infrastructure strategy and market positioning.
The stock price responded decisively to the disclosure, climbing between 7% and 9% during Thursday's session. This appreciation reflects investor recognition of the stake as validation of Nebius's competitive position within the AI infrastructure sector, which has emerged as one of the strongest performing segments within technology equities in 2026. Year-to-date, Nebius shares have advanced 130%, while the twelve-month return exceeds 420%, driven by institutional demand for neocloud providers offering AI computing capacity to enterprises and AI developers.
Nebius's strong operational trajectory supports the bullish investor sentiment. The company reported first-quarter 2026 revenue of $399 million, representing 684% year-over-year growth, alongside a net loss of $100.3 million that narrowed beyond analyst expectations. Management subsequently raised 2026 full-year guidance, citing expanded contracted capacity from a new Pennsylvania data center facility. The company has also entered a fuel cell capacity agreement with Bloom Energy, underscoring capital-intensive infrastructure buildout to support escalating AI compute demand.
Aschenbrenner's fund maintains a differentiated perspective on the AI market structure. While taking a bullish long position in Nebius, Situational Awareness simultaneously maintains bearish positions in semiconductor manufacturers including Nvidia, Broadcom, Oracle, and AMD. This stance suggests the fund's thesis favors infrastructure providers and cloud service operators that can aggregate and monetize computing capacity, rather than foundational chip manufacturers, reflecting a granular view of how AI infrastructure economics will distribute value across the supply chain.
The stock price responded decisively to the disclosure, climbing between 7% and 9% during Thursday's session. This appreciation reflects investor recognition of the stake as validation of Nebius's competitive position within the AI infrastructure sector, which has emerged as one of the strongest performing segments within technology equities in 2026. Year-to-date, Nebius shares have advanced 130%, while the twelve-month return exceeds 420%, driven by institutional demand for neocloud providers offering AI computing capacity to enterprises and AI developers.
Nebius's strong operational trajectory supports the bullish investor sentiment. The company reported first-quarter 2026 revenue of $399 million, representing 684% year-over-year growth, alongside a net loss of $100.3 million that narrowed beyond analyst expectations. Management subsequently raised 2026 full-year guidance, citing expanded contracted capacity from a new Pennsylvania data center facility. The company has also entered a fuel cell capacity agreement with Bloom Energy, underscoring capital-intensive infrastructure buildout to support escalating AI compute demand.
Aschenbrenner's fund maintains a differentiated perspective on the AI market structure. While taking a bullish long position in Nebius, Situational Awareness simultaneously maintains bearish positions in semiconductor manufacturers including Nvidia, Broadcom, Oracle, and AMD. This stance suggests the fund's thesis favors infrastructure providers and cloud service operators that can aggregate and monetize computing capacity, rather than foundational chip manufacturers, reflecting a granular view of how AI infrastructure economics will distribute value across the supply chain.
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.