A hedge fund called Situational Awareness lost $35 billion in six days. | by Austin Liu | Aug, 2026

Leopold Aschenbrenner's hedge fund, Situational Awareness, experienced a catastrophic loss of $35 billion in market value over six days in late July 2026, representing a collapse from its $45 billion peak to approximately $10 billion in assets under management. The fund's implosion was driven primarily by margin calls from its prime brokers following steep declines in AI and semiconductor equities throughout July 2026. The forced liquidation underscores the dangers of concentrated, leveraged bets in thematic investment strategies, particularly when underlying holdings experience synchronized drawdowns.

On July 30, 2026, Aschenbrenner executed a complete exit of all public equity positions—both long and short holdings—in a single block trade executed before market open. Citadel, Ken Griffin's flagship firm, acquired the portfolio, reportedly at approximately a 10% discount to the book value of the roughly $16 billion position. The fund's core holdings included exposure to CoreWeave, IREN, SanDisk, Bloom Energy, and Nebius—all companies central to Aschenbrenner's AI infrastructure and semiconductor thesis. Within three trading sessions of the July 29 margin call and subsequent July 30 liquidation, several core positions rebounded sharply: CoreWeave closed 41% above its liquidation low, IREN rallied 36%, and SanDisk gained 27%.

Aschenbrenner, a Columbia University valedictorian who graduated at 19 and joined OpenAI's superalignment team at age 21, founded Situational Awareness on a contrarian thesis outlined in a 165-page essay arguing that the investment community broadly underestimated artificial intelligence's economic transformation. He was terminated from OpenAI in April 2024 over disputed allegations of a security breach. Despite the catastrophic July drawdown (67% monthly loss), the fund remained up approximately 80% year-to-date as of August 2026 and retained an unrealized $5 billion position in Anthropic, suggesting that the underlying investment thesis had merit but was severely undermined by overleveraged portfolio construction and inadequate margin management.

The collapse illustrates a critical risk in thematic hedge fund strategies: when concentrated bets in a single narrative (AI infrastructure) experience synchronized declines, leverage amplifies losses and triggers forced liquidations that can disconnect realized prices from fundamental valuations, particularly in periods of broader sector volatility. The fact that most positions rebounded sharply within days of the fire sale suggests that the liquidation was driven by mechanical margin dynamics rather than fundamental deterioration in the underlying thesis, though the fund's leverage ratio and prime broker relationships ultimately determine survivorship in market dislocations.