Key Takeaways
- • Leopold Aschenbrenner's Situational Awareness LP hedge fund sold its entire stock portfolio in a block trade after steep losses, with Citadel identified as the buyer, following a sharp AI-sector rout in July 2026.
- • The fund had grown to as much as $45 billion in assets before the downturn, delivering approximately 439% returns after fees through June 2026, but faced a capital crunch triggered by losses in concentrated AI infrastructure positions including Bloom Energy, CoreWeave, and Nebius.
- • Aschenbrenner approached existing investors and lenders for fresh capital injection and offered some investors the opportunity to purchase portfolio assets directly, signaling liquidity pressures at the $20 billion fund.
- • The portfolio collapse coincided with the U.S. IPO of SK Hynix, one of the fund's largest holdings, and a broader unwind of leveraged positions that triggered steep declines in South Korean stocks and AI infrastructure equities.
- • Despite the rout, the fund's July 24 investor letter characterized the tech downturn as a buying opportunity and cited a potential Anthropic IPO as a forward catalyst, suggesting management maintained a constructive long-term outlook.
Summary
Leopold Aschenbrenner's Situational Awareness LP hedge fund executed a full exit from its equity portfolio through a single block trade in late July 2026 after suffering significant losses in its concentrated bet on AI infrastructure companies. According to CNBC, Ken Griffin's Citadel emerged as the buyer of the portfolio, marking a dramatic reversal for the 24-year-old fund manager whose AI-focused strategy had delivered exceptional returns just months earlier.
The scale of the fund's prior success underscores the magnitude of the reversal. Situational Awareness had grown to as much as $45 billion in assets under management and delivered approximately 439% returns after fees through the end of June 2026—a remarkable performance that had established Aschenbrenner as one of the preeminent voices in AI-driven investing. The fund's equity positions had expanded from $225 million in early 2024 to $5.5 billion by the fourth quarter of 2025, demonstrating aggressive capital deployment into AI infrastructure plays. However, the sharp downturn in July triggered a forced liquidation and prompted the fund to seek emergency capital through outreach to existing investors and lenders.
The market dynamics underlying the collapse centered on specific catalysts that unraveled leveraged positions across the sector. The U.S. IPO of SK Hynix, which was among the fund's largest holdings, coincided with a broader unwinding of leveraged positions that created steep declines in South Korean equities and rippled across AI infrastructure stocks. Publicly traded positions in the fund's known long book—including Bloom Energy, CoreWeave, and Nebius—were particularly hard hit. Earlier quarterly filings showed the fund had also held substantial positions in SanDisk and Micron, alongside emerging AI-adjacent infrastructure bets including a $43.9 million position in T1 Energy, a 92.4% increase in Bitdeer Technologies, and 3.39 million shares of HIVE Digital Technologies.
In a July 24 letter to investors, Situational Awareness management characterized the technology sector rout as a buying opportunity rather than a fundamental repricing, and identified a potential Anthropic IPO as a forward catalyst for the sector. This positioning suggested the fund maintained conviction in its AI infrastructure thesis despite the forced liquidation, though the capital crunch reflected the acute risks of concentrated leverage in rapidly shifting markets. Aschenbrenner, a former OpenAI researcher who was fired in April 2024 over an alleged information leak dispute, had built his fund on the premise that AI infrastructure buildout would generate outsized returns—a thesis that delivered spectacular gains before reversing sharply in the current quarter.
The scale of the fund's prior success underscores the magnitude of the reversal. Situational Awareness had grown to as much as $45 billion in assets under management and delivered approximately 439% returns after fees through the end of June 2026—a remarkable performance that had established Aschenbrenner as one of the preeminent voices in AI-driven investing. The fund's equity positions had expanded from $225 million in early 2024 to $5.5 billion by the fourth quarter of 2025, demonstrating aggressive capital deployment into AI infrastructure plays. However, the sharp downturn in July triggered a forced liquidation and prompted the fund to seek emergency capital through outreach to existing investors and lenders.
The market dynamics underlying the collapse centered on specific catalysts that unraveled leveraged positions across the sector. The U.S. IPO of SK Hynix, which was among the fund's largest holdings, coincided with a broader unwinding of leveraged positions that created steep declines in South Korean equities and rippled across AI infrastructure stocks. Publicly traded positions in the fund's known long book—including Bloom Energy, CoreWeave, and Nebius—were particularly hard hit. Earlier quarterly filings showed the fund had also held substantial positions in SanDisk and Micron, alongside emerging AI-adjacent infrastructure bets including a $43.9 million position in T1 Energy, a 92.4% increase in Bitdeer Technologies, and 3.39 million shares of HIVE Digital Technologies.
In a July 24 letter to investors, Situational Awareness management characterized the technology sector rout as a buying opportunity rather than a fundamental repricing, and identified a potential Anthropic IPO as a forward catalyst for the sector. This positioning suggested the fund maintained conviction in its AI infrastructure thesis despite the forced liquidation, though the capital crunch reflected the acute risks of concentrated leverage in rapidly shifting markets. Aschenbrenner, a former OpenAI researcher who was fired in April 2024 over an alleged information leak dispute, had built his fund on the premise that AI infrastructure buildout would generate outsized returns—a thesis that delivered spectacular gains before reversing sharply in the current quarter.
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