Aschenbrenner's Situational Awareness fund collapses from $45B to $10B on margin calls, leverage blowup

Leopold Aschenbrenner's Situational Awareness hedge fund imploded this week from $45 billion in assets to roughly $10 billion after semiconductor and AI stocks tumbled, triggering massive margin calls. With reported leverage of up to 400%, the fund was forced to liquidate all public equity positions—including hard-hit holdings in SK Hynix and CoreWeave—at a discount to Ken Griffin's Citadel. The collapse marks a dramatic reversal for Aschenbrenner, the former OpenAI researcher whose 165-page 2024 AI manifesto made him a Silicon Valley celebrity and drew a polarized following.

The fund had generated more than 1,000% gains since inception in July 2024, but critics flagged from the start that Aschenbrenner had zero money-management experience and was overleveraging aggressively. About two-thirds of the remaining portfolio was in equities (long and short), with the rest anchored by a multibillion-dollar stake in Anthropic. Aschenbrenner is 24 years old and his only prior finance role was at FTX, where he worked under now-disgraced founder Sam Bankman-Fried.

For the market, this is the first major AI-themed hedge-fund casualty of the broader volatility and repricing now underway. While Aschenbrenner's macro thesis on AI superintelligence may prove correct over decades, the public markets have proved unforgiving of 4x leverage on single-sector bets when sentiment shifts. The forced sale to Citadel also raises questions about concentration in AI infrastructure positions and whether similar overleveraged positioning elsewhere could amplify any next drawdown.