On July 30, Leopold Aschenbrenner's Situational Awareness hedge fund was forced to liquidate its entire public equity portfolio to Ken Griffin's Citadel after margin calls from Goldman Sachs, JPMorgan, and Bank of America. The fund, which had returned 439% through June and peaked at $45 billion AUM, collapsed to $10 billion after positions in SK Hynix, CoreWeave, Nebius, and Micron fell 35–47% in July alone. The leverage was the trigger: the fund ran approximately 4x borrowed capital, turning a 35% drawdown into a wipeout of equity cushion. This forced selling—not fundamental deterioration—was the mechanism of destruction.
The unwind was also kinetic. SK Hynix's July 10 IPO triggered a broader Korean equity selloff; simultaneously, Aschenbrenner's short positions in software (Adobe, others) moved sharply against him. The Philadelphia Semiconductor Index fell 28.6% from June 22 to end-July, and the Morgan Stanley Momentum TMT Index dropped 53.5%, but this was partly forced liquidation and partly profit-taking on already-extended valuations. After Citadel took the portfolio, semiconductor stocks rebounded sharply Aug 1–7. AMD gained 11%, NVDA +9%, Micron +18%, Corning +13%.
For architects: this was a clearing event. Aschenbrenner's thesis (AI buildout requires massive semi/memory/power expansion) remains intact, but the leveraged crowded trade that was financing it has unwound. Earnings reports from Microsoft, Amazon, and others in the week after have reaffirmed capital plans, suggesting capex discipline is sustainable. The volatility was mechanical, not fundamental. Expect inference demand and memory demand to remain tight through 2026–2027.