Ex-OpenAI Fund’s $2.6B Stake Sends Nebius Shares Up 10%
NBIS•Situational Awareness disclosed a 12.41 million-share (5.6%) stake in Nebius, valued at $2.6 billion, making it the largest investor in the AI infrastructure provider. This disclosure propelled Nebius shares over 10% to a two-week high, following its $17 billion multiyear AI computing deal with Microsoft from September 2025.
1. Major Stake Acquisition
Situational Awareness, the AI-focused hedge fund managed by former OpenAI researcher Leopold Aschenbrenner, filed a Schedule 13G disclosing ownership of 12.41 million Nebius shares, a 5.6% passive stake valued at $2.6 billion.
2. Stock Price Reaction
The disclosure triggered a rally exceeding 10%, lifting Nebius shares to a two-week high as institutional and retail traders responded to the fund’s entry into the company’s share register.
3. Key AI Infrastructure Partnerships
Nebius operates its own high-performance computing data centers and secured a $17 billion multiyear agreement with Microsoft in September 2025, underpinning strong revenue growth and market positioning in AI infrastructure.
