Leopold Aschenbrenner, a former OpenAI researcher, built an AI-focused hedge fund called Situational Awareness, which attracted significant attention after amassing $45 billion in assets early in July 2026. Known for his 2024 AI manifesto, Aschenbrenner gained Silicon Valley fame as a visionary on artificial intelligence’s future. However, his fund suffered a dramatic collapse within days, plummeting to around $10 billion following steep declines in semiconductor stocks and forced margin calls. To manage these losses, Aschenbrenner sold off highly leveraged stock positions, including shares in SK Hynix and CoreWeave, at a discount to Citadel, Ken Griffin’s investment firm.

Situational Awareness had reportedly operated with leverage as high as 400%, a strategy that many Wall Street insiders had warned was risky given market volatility. Despite remarkable gains of over 1,000% since inception, critics were quick to point out Aschenbrenner’s lack of prior money management experience and ties to the defunct crypto firm FTX, where he had worked with disgraced founder Sam Bankman-Fried. Industry experts had anticipated a potential collapse, especially in the unpredictable public markets, underscoring the hazards of heavy leverage amid rapid AI sector shifts.

Aschenbrenner’s background includes a strong academic record as a Columbia University valedictorian and early work in Effective Altruism, which influenced his career path. After a stint at FTX’s philanthropic arm and later a role at OpenAI’s Superalignment team, he was dismissed by OpenAI in 2024 amid controversy over security disclosures. Following his departure, he authored a widely discussed manifesto asserting that artificial general intelligence could emerge imminently, a view that both impressed and divided experts. His hedge fund launch later that year was backed by notable investors including Stripe co-founders Patrick and John Collison, former GitHub CEO Nat Friedman, and investor Daniel Gross.

While Aschenbrenner’s AI hedge fund crash marks a striking setback, it also highlights the volatile intersection of cutting-edge technology investing and financial speculation. The fund’s remaining assets include private investments, notably a multibillion-dollar stake in AI startup Anthropic, whose CEO’s chief of staff, Avital Balwit, is engaged to Aschenbrenner. As the AI industry continues to evolve rapidly, the episode serves as a cautionary tale about the risks involved in leveraging hype and high expectations for emergent technologies.