Citadel Bought A Collapsing AI Fund’s Portfolio. Three Weeks Later, It Has Shed 80% Of The Risk.

Citadel, the $68 billion multi-strategy hedge fund led by Kenneth Griffin, has acquired and substantially de-risked the portfolio of Situational Awareness, an AI-focused hedge fund founded by 24-year-old Leopold Aschenbrenner, a former OpenAI researcher. The transaction followed Situational Awareness's dramatic collapse in July 2026, when the fund experienced a 67% loss after previously managing approximately $45 billion in assets.

Situational Awareness faced severe margin pressures from its lenders, who ultimately ran out of patience with the fund's deteriorating position. The fund unwound most of its approximately $16 billion in public stock holdings by selling to Citadel, marking a rescue operation for a firm that had initially generated exceptional returns by transforming a $200 million base into a $45 billion fund before the sharp reversal in AI equity valuations.

In a client letter dated Friday, August 21, 2026, Griffin disclosed that Citadel has completed the acquisition and executed an aggressive de-risking strategy. The fund conducted more than 100 block trades and reduced the aggregate risk from the original portfolio by over 80% within the three-week period following the purchase. This rapid position unwinding demonstrates Citadel's operational capacity to absorb large concentrated portfolios and execute systematic liquidation while managing market impact through institutional-scale block trading mechanisms.

The transaction underscores the volatility in AI-focused investment strategies and the leverage risks inherent in concentrated sector bets. Aschenbrenner's fund had become a proxy for AI infrastructure investment thesis, and the severe drawdown reflects both market repricing of AI equity expectations and the amplified losses that leveraged positioning can produce during sector corrections.