Leopold Aschenbrenner’s $45B AI Fund Collapses 67% in July

Leopold Aschenbrenner’s Situational Awareness hedge fund has collapsed from $45 billion to $10 billion in a matter of weeks. The 24-year-old former OpenAI researcher’s fund dropped 67% in July alone after his concentrated bets on AI infrastructure stocks like SK Hynix and CoreWeave imploded. On Thursday, Ken Griffin’s Citadel acquired nearly the entire stock portfolio in a forced fire sale, marking one of Wall Street’s fastest reversals from triumph to ruin.

How a $45 billion AI bet unraveled in weeks

Situational Awareness had built massive long positions in semiconductor and data center companies expected to supply AI infrastructure. By March 31, the fund held large stakes in Nebius, Bloom Energy, SanDisk, and CoreWeave. Simultaneously, it shorted software stocks like Adobe. When AI infrastructure shares fell 50% to 78% from recent peaks in July, the fund lost money on both sides. The short positions that were supposed to hedge the longs instead rallied, compounding losses. With four times leverage amplifying every decline, the fund’s equity cushion evaporated fast.

Margin calls forced the liquidation spiral

As the portfolio value plummeted, prime brokers including Goldman Sachs, JPMorgan, Bank of America, and Citigroup demanded additional collateral. Aschenbrenner’s fund had to sell holdings to raise cash, which pushed prices lower and triggered more losses. This deleveraging spiral accelerated through Wednesday, July 30. By Thursday morning, the fund had exited all public investments in a single block trade. Citadel, led by Ken Griffin, stepped in to buy the leveraged portion of the portfolio at a discount in what sources called one of the largest rushed transactions in Wall Street history.

The rise and fall of an AI prophet

Aschenbrenner built his reputation on a 165-page June 2024 manifesto titled “Situational Awareness,” which positioned him as a prophet of artificial superintelligence. The essay became required reading in Silicon Valley. His fund, launched in July 2024, returned 439% net through June 30, 2026, and had reached $45 billion in assets by early July. Critics noted Aschenbrenner had no prior money management experience and had worked at failed crypto firm FTX. His early success masked the concentration risk and leverage that would destroy the fund in a single month.

What remains after the collapse

After the Citadel deal, Situational Awareness retained approximately $10 billion in assets, mostly private holdings including an Anthropic stake that was not sold. The fund’s portfolio had shrunk from $45 billion to $10 billion, a 78% destruction of value. Aschenbrenner and Griffin have not publicly commented on the transaction. The collapse serves as a stark reminder that even brilliant market calls can fail under excessive leverage and concentrated positions when momentum reverses.

Final Thoughts

Aschenbrenner’s implosion mirrors past hedge fund disasters: Long-Term Capital Management, Archegos, and Amaranth all started with strong returns before leverage and hubris destroyed them. For investors, the lesson is clear: leverage amplifies both gains and losses. Even visionary AI thesis cannot survive a four-times-leveraged bet on illiquid positions when the trade reverses.

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