Version 4

Leopold Aschenbrenner — a former OpenAI researcher dismissed in 2024 who claims it was retaliation for raising safety concerns [1] — holds a 5.6% stake (12.41 million shares) in Nebius Group (NBIS) worth approximately $2.86 billion through his Situational Awareness LP hedge fund [33][11]. The disclosure moved Nebius shares up more than 10% [13] and was followed by Nebius reporting 684% revenue growth [16]. A meaningful factual discrepancy has now emerged: independent portfolio trackers computing directly from 13F filings put Situational Awareness LP's AUM at $5–5.5 billion [8][9][10], significantly below the $13.7 billion figure widely circulated in promotional coverage [4]. Jim Cramer has commented on the NBIS stake [18], marking the story's arrival in mainstream financial punditry.

Aschenbrenner sits at an unusual intersection: a safety-focused AI intellectual whose financial convictions are now publicly legible via regulatory filings, and whose disclosed positions move public markets. The independent AUM data — $5–5.5B from portfolio trackers vs. the circulated $13.7B — matters because the credibility of the Situational Awareness investment thesis is partly tied to the claimed scale. The concentrated bet on AI compute infrastructure, now validated by Nebius's explosive revenue performance, operationalizes a specific theory of where durable value in the AI transition will accrue.

Leopold Aschenbrenner first drew broad attention when he was dismissed from OpenAI in mid-2024 under circumstances he described as retaliation for raising safety and security concerns internally [1][2][3]. Shortly after, he published a 165-page essay titled 'Situational Awareness: The Decade Ahead,' arguing that superhuman AI would arrive within the current decade [4][5]. The essay circulated widely enough to prompt a substantive response from computer scientist Scott Aaronson [6] and established Aschenbrenner as a prominent voice on AI timelines. He then founded Situational Awareness LP, a San Francisco-based fund. Promotional coverage, citing 13F disclosures, described the fund as having grown from $225 million in initial capital to approximately $13.7 billion in assets [4][7] — a figure now directly contested by independent portfolio-tracking sites that compute AUM at $5–5.5 billion from the same regulatory filings [8][9][10].

In late May 2026, Situational Awareness LP disclosed a 5.6% stake — 12.41 million shares — in Nebius Group, a Nasdaq-listed AI infrastructure and cloud company backed by Nvidia [11][12]. The stake, valued at roughly $2.86 billion, became one of the fund's largest disclosed holdings and was covered by Reuters, CNBC, and Motley Fool as a market-moving event [13][14][15]. Nebius shares rose more than 10% on the disclosure [13], and the company separately reported 684% revenue growth driven by booming data-center demand [16] and announced plans to raise AI infrastructure spending to $25 billion [17] — lending business fundamentals to a thesis that had previously rested on investor conviction alone. Jim Cramer subsequently commented on the NBIS stake [18], marking the story's arrival in mainstream financial punditry beyond specialist hedge-fund trackers.

The disclosure triggered a sustained social media amplification cycle: Milk Road AI ran a six-post series through May 31 blending Aschenbrenner's intellectual safety arguments with his investment track record [19][20][21]; financial accounts retweeted the original burrytracker breaking-news post across multiple platforms [22][23][24][25]; and Reddit communities in r/NBIS_Stock and r/investing engaged substantively with the stake and the Situational Awareness thesis [26][27][11]. A LongtermWiki entry [28] and a publicly accessible SEC Form ADV filing via Radient Analytics [29] now provide more structured documentation of the fund for researchers seeking primary sources.

Running in parallel to the investment story, Aschenbrenner's public argument holds that 'almost nobody is actually working on AI safety' despite industry rhetoric [20], that AI honesty is the crux of the alignment problem [30], and that OpenAI specifically failed on safety culture [1][2]. Published critics have characterized his AGI-by-2027 timeline as speculative hype with poor historical precedent [31][32]. The combination of a $2.86 billion infrastructure bet and a safety-focused intellectual identity creates a structural tension between financially incentivizing the AI buildout and advocating caution about its risks — a tension Aschenbrenner has not directly addressed in public statements.