Leopold Aschenbrenner's Situational Awareness hedge fund experienced a dramatic collapse in July 2026, losing approximately 67% of its value after previously achieving an astonishing 439% return earlier in the year. The fund's assets, which had swelled from $225 million to a peak of $45 billion, were significantly impacted by concentrated bets on AI hardware stocks and short positions on software companies like Adobe. The use of roughly four times leverage magnified both initial gains and subsequent losses when the market reversed, and Adobe's stock moved higher.
The rapid unwind was triggered by a barrage of margin calls from lenders, forcing Aschenbrenner to liquidate positions quickly. Citadel, led by Ken Griffin, acquired a substantial portion of the fund's public portfolio at a discount. This episode highlights the inherent risks associated with excessive leverage, particularly in crowded and volatile sectors like AI, and the vulnerability that can arise from illiquidity and concentrated positions.
Prior to the collapse, Aschenbrenner, a former OpenAI researcher with no prior investment experience, had seen his firm's assets plunge from $45 billion at the start of July to about $10 billion. He took responsibility for the events, attributed some losses to short sellers, and vowed to run the public stock portfolio without leverage going forward, committing to learn from the experience. Despite the significant losses, the fund was still reportedly up around 80% for the year, and Aschenbrenner continues to manage a major equity hedge fund.
