In June this year, Leopold Aschenbrenner was still one of Wall Street's most sought-after young fund managers. His portfolio was widely shared, with investors scrambling to figure out why he bought into storage, data centers, power equipment, and companies shifting from Bitcoin mining to AI computing power. Some turned his 13F filings into spreadsheets, while others scanned his holdings for the "next big AI infrastructure stock." The media loved calling him the "AI Prophet" or the "God of AI Stocks." But by late July, the news suddenly changed: Leopold got margin-called...