Leopold Aschenbrenner's hedge fund collapsed in less than a month, falling from managing an estimated $45 billion to a fire sale of nearly its entire public stock portfolio, bought by Ken Griffin's Citadel at a discount. The 24-year-old, once called the "Nostradamus of AI," faced the blowup in the same week he was getting married. According to CNBC's David Faber, the fund sold its entire public equities book, both long and short positions, in a single block trade, with the Wall Street Journal identifying Citadel as the buyer. The proximate cause was leverage, as Aschenbrenner ran three to four times leverage on his positions, borrowing three to four dollars for every dollar of investor capital. CNBC reported the fund was forced to meet margin calls from its lending banks as positions deteriorated through late July. The concentrated strategy included long bets on companies supplying chips, data centers, and power for the AI buildout, with public filings showing large stakes in Nebius, Bloom Energy, SanDisk, CoreWeave, SharonAI and IREN as of the end of March, while shorting software firms. When memory and semiconductor names sold off in July, both sides of the leveraged book got hit. The fund's private portfolio, including a significant stake in Anthropic, was not part of the sale; Michael Spencer's AI Supremacy newsletter estimated roughly $5 billion remains in his Anthropic position alone, though that figure is