25-Year-Old Lost $35 Billion of His Investors' Money. 2 Weeks Later, Silicon Valley Insiders Are Lining Up to Give Him More Cash.

Leopold Aschenbrenner, a 25-year-old Columbia University valedictorian and former OpenAI researcher, experienced a catastrophic loss of approximately $35 billion in investor capital within days in late July 2026. His AI-focused hedge fund, Situational Awareness, collapsed from a $45 billion valuation in early July to approximately $10 billion by late July following a sharp selloff in AI-linked equities that triggered margin calls on the fund's highly leveraged positions.

The fund's portfolio strategy centered on concentrated directional bets with leverage ratios reaching 400%. Long positions included Nebius Group (down 17.98% between July 1 and August 7), SanDisk, CoreWeave, and South Korea-listed SK Hynix. The fund simultaneously maintained short positions, including Adobe, which moved against the fund during the market downturn. As lenders moved to call collateral, Aschenbrenner liquidated most of his public-equity portfolio to Citadel, Ken Griffin's flagship fund, at approximately a 10% discount. The fund preserved private equity stakes in Anthropic (last valued near $965 billion), compute infrastructure provider Fluidstack, and AI-chip startup MatX.

Aschenbrenner's rapid ascent to prominence stemmed largely from his June 2024 essay "Situational Awareness: The Decade Ahead," which argued that artificial intelligence would rapidly exceed human capability and became required reading across Silicon Valley. The essay, combined with reported returns that converted $225 million into $5.5 billion within 12 months, attracted backing from prominent venture capitalists and financial institutions. The fund's limited partners included Stripe co-founders Patrick and John Collison, former GitHub CEO Nat Friedman, investor Daniel Gross, JPMorgan, Goldman Sachs, and Bank of America, with a reported minimum investment of $25 million.

Critically, no fraud or misappropriation has been alleged in connection with the loss. The collapse resulted entirely from forced liquidations of leveraged public positions during margin calls—a structural failure in risk management rather than criminal conduct. Remarkably, within two weeks of the fund's near-total drawdown, Silicon Valley insiders and institutional investors began soliciting Aschenbrenner for allocation opportunities. The fund is currently declining new capital, signaling either a period of retrenchment or a reassessment of strategy. The episode illustrates both the extreme concentration risk embedded in leverage-heavy AI-sector hedge fund strategies and the persistent appetite among elite investors to back promising technologists regardless of recent performance volatility.